practical DECEMBER 1995 X1.

90

PROJECTS " ROBIN BEN NOCK G4BXD

eVc
SAYS..."PASS THE BLACK
O COUNTRY SCREWDRIVER"
HARDING'S HOME-BREW
a LOCKING THE DROITVVICH
FROM SCREWDRIVER TO
'MODDI -Sri= Seyf 'SCOPE

SCE ER?
C.)-11XJ-q) -frir:-.:5 111E: J

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AUTO BEAT
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POWER N.R. TX EO.

ICC CANCEL

3.'1 !23 LI
NOTCH
ATT HI/SHIFT
LO/WIDTH FILTER
ANT DOWN UP

VOX FuLt /SEAM AIP

HF TRANSCEIVER TS -870 ON AIR AT ?Wm
RIT XIT CLEAR NB
Al TUNE THRU/AUTO ME TER PROC MON] O CH T Q M.IN MODE A=B MENU

RIT/XIT

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SENO CM 2 D 121 AIFO

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PHONES
CW/-R

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Special Christmas Sub And
Antenna Analyser Offers
I-
1 1
9 77014 085020
& All Your Favourites!
 Only one DialNolume knob
required for easier use

a *

contigura-
dual recewe
0104 Or r nrs
'Three
tronsVHFN4,h rnam band
t rip Liu
WE IONE
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on nght allows
frequeno
programoungsub band
flextble mam or active
trans' on

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6,
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readout
SpectrascoPe
adlacent
" displays rea tme
trequencies
signat strength
ton ot batterN with relative
condi ailoiNs
.0003000 displays
stop unction iocv,-
rtoTtit.1 use Scan
individuai
memory
channel
mode
scanning
out during
er alpha-numenc
An s charact operaton
menu scrolls oi
user help in the bottom
instructors
large, bacIdd
ditsplay Specifications
Frequency Coverage
FT -51R
VHF RX 110-180 MHz
2 ,'Wx 4A"Rx 1A"D TX 144-146 MHz
i2 Watt version shown.) UHF RX 420-470 MHz
MH-29A2B
TX 430-440 MHz
LCD Display Mic Spectrascope' Display
with Remote Scrolling User Help Menu
Functions.
Alpha -Numeric 8 Character
(Optional)
Display
Up/Down Volume/Squelch
Controls 8 Display
The new FT -51R memories. A cloning feature duplicates Selectable Sub -Band TX Mute
Dual Band HT is favourite channels to another FT -51R. Automatic Tone Search (ATS)
Digital Battery Voltage Display
state-of-the-art, A digital battery voltage display, five AM Aircraft Receive
and easy to use! power output levels, the largest backlit Scanning Light System (SLS)
So easy, you won't need an operating dual band HT keypad made, Smart Mute,' 120 Memory Channels
(80 w/Alpha-Numeric)
manual. Its exclusive, scrolling instruc- two VFOs on both VHF and UHF, as well
Large Backlit Keypad 8 Display
tion menu located in the large, backlit as available 2 Watt and 5 Watt versions, Automatic Repeater Shift (ARS)
display "window", guides you through round out the exciting FT -51R. Plus, the Multiple Scanning Modes
total operation while simultaneously optional MH-29A2B Display Microphone 3 Selectable Scan Stop Modes
with Scan Skip
viewing the main display window. allows you to control volume and also User selectable lock function
You'll like some of the other new, access Memory, VFO, Call Channel, Band w/15 combinations
exclusive features, too. Like Spectrascope Selection and scanning functions. All of Automatic Power Off (APO)
This unique feature displays real time, this in world's smallest dual band HT radio! TX/RX Battery Savers Built-in
Handy Cloning Feature
continuous scanning of activity See the FT -51R with 5 Selectable Power Output Levels
on adjacent frequencies in VFO "windows" at your Yaesu Message system with CW ID
mode or 8 of your favourite dealer today! Selectable RX Smart Mute"
Cross -Band 8 One -Way
Repeat Functions
DTMF Paging/Coded Squelch
-I can see two frequencies "I use the Spectrascope 1,, Built-in
and alpha -numeric all at the find new contacts faster: Accessories
same time" Consult your local dealer.
"Yaesu did it again''
"Scrolling instructions tell me
what to do next'"
Y.A. it;
Performance Itithoin compromise.'"
YAESU UK LTD Unit 2. Maple Grove Business Centre, Lawrence Rd., Hounslow, Middlesex, TW4 6DR
Specifications subject to change without notice Specifications guaranteed only within amateur bands
Some accessories and or options are standard in certain areas. Check with your local Yaesu dealer for specific details
 EDITOR'S KEYLINES

Wireless 9 Rob G3XFD talks about the difficulties in

CONTErs
rg)
trying to find an RAE course.

DECEMBER 1995 (ON SALE NOVEMBER 9)

VOL. 71 NO 12 ISSUE 1065
9
COMPETITION CORNER
Try your hand at our Spot the Difference
competition this month, you may win a
)V M
NEXT ISSUE (JANUARY) prize.
( )N SALE DECEMBER 14

EDITORIAL & ADVERTISEMENT

RECEIVING YOU
10 Readers have the chance to air their views.
OFFICES PASS THE 'BLACK
l'ractical Wireless
NEWS '95 40 COUNTRY SCREWDRIVER'
\ rrowsmith Court 12 PLEASE!
New products, information and views to
station Approach Ben Nock G4BXD shares his experiences as a
keep you up-to-date.
I(roadstone 'disabled' practical amateur radio
I )orset BH18 8PW
Tr (01202) 659910
CLUB SPOTLIGHT enthusiast.
13 Has your club been spotlighted this month?
it )1a -of -hours service by answering machine) CHRISTMAS
FAX (01202) 659950 43 SUBSCRIPTION OFFER
NOVICE
16 NATTER Does someone else read your copy of PW
PWs Internet address is: every month? - Then why not buy them a
Elaine Richards G4LFM
@pwpub.demon.co.uk You can send PW Gift Subscription?
passes on some more
mail to anyone at PIN, just insert their
hints and tips from the
name at the beginning of the address,
Tiarterings' she's VALVE & VINTAGE
e.g. rob@pwpub.demon.co.uk
received this month.
44 Phil Cadman G4JCP suggests ideas for
reproducing 'valved audio effects'.
Editor
REVIEW - THE
Rob Mannion G3XFD
18 ALINCO DJ - EQUIPMENT
Technical Projects Sub -Editor
191 144MHz 46 SPECIFICATIONS
NG ("Tex") Swann G I TEX Ian Poole G3VWX unravels the mysteries
Production/News
TRANSCEIVER
Richard Newton GORSN behind spurious transmitter signals.
Donna Vincent G7TZB
puts the latest release
Editorial Assistant VHF REPORT
from Alinco through its
mot. Shortland
paces.
48 David Butler G4ASR explains how even
Art Editor Steve Hunt simple callsigns can provide a lot of
Page Layouts Jon Talbot & Marcus Hall geographical information.
SUBS CLUB
20 This month we give you
Advertisement Manager
the chance to save HF FAR & WIDE
Roger Hall G4TNT
money on the MFJ-259 antenna analyser and
50 Leighton Smart GWOLBI reports on the
1'0 Box 948 month's h.f. activity.
the offer is open to non -subscribers as well!
ondon SW6 2DS
IT 0171-731 6222 BROADCAST ROUND -UP
NEW BOOKS
Mobile (0585) 851385 20 News of two new publications from PW
53 Peter Shore rounds -up the latest broadcast
FAX 0171-384 1031 band news.
Publishing.
Advert Sales and Production BITS & BYTES
(Broadstone Office)
FROM SCREWDRIVER TO 54
22 'SCOPE Mike Richards G4WNC brings you all the
Lynn Smith (Sales), latest news from the world of computing In
Elaine Richards G4LFM looks at three types
ilsa Turbett G7TIC (Production) racliO'
of workshop set -UP
lr (01202) 659920 - 9.30am - 5-30pm
FAX 101202) 659950
MODDING THE ROBIN FOCAL POINT
24 Ken Ruiz G4SGF/ZB2MD has some updates to
56 Andy Emmerson G8PTH reports on an
CREDIT CARD ORDERS Interesting ATV contact between the UK and
improve the 'popular' PW Robin frequency
V (01202) 659930 the Netherlands.
counter.
)ut-oi-hours service by answering mat t11111.
FAX (01202) 659950 BARGAIN BASEMENT
REVIEW - THE KENWOOD 57
TS -870S HF TRANSCEIVER Readers' Advertisements.
26
Rob Mannion G3XFD tries the latest from
Front Cover Photograph: IQ THE PRACTICAL WIRELESS
Kenwood and asks is it the ultimate
Craig Dyball transceiver? JU 1995 INDEX
Croyaillut Pw PUBLISHING LTD. I996 Copyright in a dramas°,
PhotiaNaphs and erneles publrehed o Practice/Mak= is Tully wowed BOOK SERVICE
end reproduCtiOn in Mole Or pan m esp. essly lottadden All reasoaable
wet owns are taken by rec.' LIA,Vss to Climes that the advice and
63 Looking for a book to compliment your
dal p.ve Iii 911, Acts art. rehable We not hotyever pt.; antee and
ore cannot accept legal responsibility lot acan
Prices are those current as We hobby? - have a look through our
.0) to pins comprehensive selection.
Pubbsbed on Ow second Thursday al each month by FYI Publishing Lid
Auouronah Court Sumo. kopokek &Godsons, Mallet 0110 DPW. Tel
°INN/659910. Punted in England by Souther/one* ANeb allied Lid
stnbuted by Serum, Waldo, Nouse, 1270 London Road. Mobley. London ENDNOTES
4774 to 01F1 e79! 299 F. 0151 fi7999117 Tete. 59I5955 the Poe,. 67 News of what's coming In your favourite
LOCKING THE ROBIN TO
,

amateur radio magazine next month

30 DROITWICH
Mike Rowe GFUVE describes a frequency
standard modification to his 'popular' Robin
project.

HARDING'S HOME-BREW
36 Stephen Harding G4GJS alms to help you
enjoy your time in the workshop by passing
on some ideas and suggestions which have
68 ADVERTISERS INDEX
rYrr helped him

Practical Wireless, December 1995 1

 SMC, ARE & REG WARD

IC -706
P4iss. jr'S
SPL XFC

NOW IN STOCK
ourpricet 1075
NOW YOU CAN CHOOSE FROM ALL THE MAJOR
MANUFACTURES FOR DSP HF TRANSCEIVERS

ICOM IC -775
* DDS with mixer less PLL
DSP
* Digital noise reduction save
* 200 watts output MOS-FET finals
* Digital AF automatic notch £500
* Twin pass band tuning 9MHz & 455kHz
* High dynamic range receiver
* Digital PSN modulator/demodulator
our price £3199
YAESU FT-1000Mir
* Enhanced digital signal processing save
* Collins mechanical SSB filter
* Direct digital synthesizers £350
* 13 selectable tuning steps 0.625Hz minimum
* Built in mains PSU
* Built in RS -232 interface
* Transverter output + VHF/UHF display
our price 2499
KENWOOD TS -870S
* Razor sharp digital Rx filters
* Exceptional noise reduction performance --
* DSP signal detection save
* Auto ATU active on Tx & Rx 3 sr:. t
* IF auto notch filter £300
* High speed PC control 65,600bp our price £2099
All discounts are based on recommended retail prices.
CARR A = £2.50 CARR B = £5 (Handi's) CARR C = £9.50 (Mobiles) CARR D = £13.50 (Base Stations) CARR E = £16.50
2 Practical Wireless, December 1995
 Avg&TNC's and
come-rAN-rentuk USED EQUIPMENT
Data Modems COMET ANTENNA ACCESSORIES HF TRANSCEIVERS 8 AMPLIFIERS
Ax IC -720A Icom Good HF transceiver . £400
PK12 -A new VHF TNC that offers superb RS20 Mini Gutter Clip £19.50 AX FT-902DM Yaesu Fair HF trasceiver vahre PA 0450

performance and simplicity of operation. RS21 Mini Hatchback mount £19.50 Ax La 120 Ham V. Good HF 100w amp .. 0125

Mini Cable Assembly £26.50 Ax FT -102 Yaesu Fair HF transceiver PA -3 x 6418's 0475
ONLY £119.00 INC Carr B CK-31mB
Ax FT-747GX Yaesu Good HF 12v transceiver 0499
WS 1M Window Mount & Cable £39.00 AX TS -830S Kenwood V Good HF transceiver £515
PK12/100K - 100k Mail Drop Memory Icom
AX IC -725 V Good HF transceiver. boxed £624
Upgrade L-17.00 Carr A COMET STATION ACCESSORIES Ax IC -726 learn V. Good HF & 6m transceiver, boxed 0699
CBL-30 HF 1:1 Balun 1kW PEP £23.50 AX TS -430S Kenwood Mint HF Tx/Rx FM, CW titter £650
PK232/MBx - An old favourite that still AX FT -890T Yaesu Mint HF transceiver with ATU 01.199
offers state of the art performance. CBL-200 HF 1:1 Balun 2kW PEP £29.50
BX FT-901DE Yaesu Good HF transceiver .. £449
BETTER VALUE THAN EVER AT ONLY CSW-20N Switch 2 WAY 'N' £39.00 LX FT -1010B Yaesu Good HF transceiver £275

INC Carr C CF-30MR HF Low Pass Filter 1kW PEP £43.95 LX FT -7B Yaesu Good HF transceiver 1275
FT -101E Yaesu Good HF transceiver 6 band £325
CF 50MR 6M Low Pass Filter 1kW PEP £43.95 LX
LX FL -700 Yaesu As new HF linear, boxed 0.650
CF -30H HF Low Pass Filter 2kW PEP £69.00 LX FT -890T Yaesu As new HF transceiver. boxed 0.250
CF -30S HF Low Pass Filter 150W PEP £25.00 LX FT-757GX Yaesu Good HF transceiver £575
LX 10-726 Icom V. Good HF v 6m transceiver £665
CF -SOS 6M Low Pass Filter 150W PEP £25.00

--------
LX FT -747 Yaesu Good HF transceiver £475
CF BPF2 2M Band Pass Filter 150W PEP £49.95 LX TS -820S Kenw Good HF trans. no WARC bands. 0400
PAKFIA7,232
CD -160H PWR 1.6-60MHZ 20/200/2000W £99.00 LX TS -140S Kenwood Good HF transceiver
LX FT-767GX Yaesu V Good HF transceiver 95
£1£4550
CD -270D PWR 140-525MHZ 15/60/2kW £89.00
PK900 - Deluxe multimode data terminal LX TS-850SAT Kenwood Excellent HF Tx/Rx with internal Al U £1.350
CMX-2 PWR 1.8-200MHZ 20/50/200W £119.00
ONLY L.-159.001NC Carr C LX FT-757GX Yaesu Good HF transceiver Gen Car Rx £575
CA-21HR 7MHZ Mobile Whip £49.95 PX TS -440S Kenwood Good HF Tx/Rx Gen Cov 100W C649
PK96 - 9600 Baud packet TNC with 14K of CA-14HR 14MHZ Mobile Whip £49.95 PX AT -50S Kenwood Excellent Auto ATU matching TS -50 0225

mail drop memory. £1 89.00 INC Carr B CA-21HR 21MHZ Mobile Whip £46.00
PX IC -728 Icom Unused HF 100W Gen Cov Rx £899
PX IC -135 Icom Excellent HF 100W Gen Cov Rx & PSU ..E675
PAK WIN - Windows based packet software CH72S 2M/70CM Whip BNC £18.50 PX FT -1000 Yaesu Unused HF trans additional Sub Rx £2,595
PX FT -7575X11 Yaesu Good HF Tx/Rx Gen Coy Rx £675
programme CH600MX 2170/23CM Whip BNC £29.50
PX TS -130S Kenwood Fair HF 1001N with Ext VFO £395
ONLY L79.00 INC Carr A HR -50 6M MOBILE Whip £49.95 PX FTONE Yaesu Good HF transceiver Gen Coy Rx £750
CA2X4KG 2M/70CM Mobile Whip £49.00 PX FT -980 Yaesu Good cond HF 100W gen Rx/Tx ham sib £925
PX 61-180 Tokyo Good HF 10W 80mtr mobile SSEICW sir. 1289
Z4 2m/70CM M. whip w/locking collar £35.00
RX IC -7204 Icom Poor HF transceiver
B-10 2M/70CM Mobile Whip £21.50 RX FT -990 Yams Good HF Tx/Rx. C1E,349550

B -22M 2m/70CM Mobile Whip £44.95 RX IC -168 Icom Fair HF transceiver £1,778
RX FT -78 Yaesu Good Mobile HF transceiver 50W .....E225
CHL21J 2M/70CM Mobile Whip £19.00
nATI RX TS -530 Kenwood Good HF transceiver £395
Cusheraft %menus are line of the best range currentls as ailahle. CA -258 2m/6m Mobile Whip £29.00 RX FT -10C0 Yaesu Fair HF transceiver 200W dual Re ..£1,950
The, otTer superb performance. innosatise design. excellent build CA 350dB 6M/10M Base Colinear £149.00 RX TS-450SAT Kenwood Good HF transceiver with auto ATU£1,025
(plaids and outstanding sable for money. RX 30L-1 Collin good HF in amp £4255
ABC23 3 x % Base Colinear £55.00
HF Antennas RX IC -735 V. good HF Tx/Rx
GP9N 2M/70CM Base Colinear £135.00 RX FT -101Z Yaesulcom HF transceiver C425
R5 10112115/17/20 vertical 1295.00
GPI5 6M/2M/70CM Base Colinear £115.00 RX FT -277 Yams Fair HF transcerver £250
R7 10 thru to 40m vertical 089.00
RX SB-104 Transceiver £225
AV -3 14-21-28MHz vertical 4.3m long 189.00 GP95 2M7OCM/23CM Base Colinear £119.00
RX JST-100 JRC Good HF Tx/Rx £595
3-5-7-14-21-28MHz vertical 7.4m long £159.00
AV -5
COMET DUPLEXERS
AP8A 8 Band Vertical £199.00 VHF/LINF TRANSCEIVERS
CF -305 HFNHF Duplexer £25.00 £315
APR18A Radial Kit £49.00 AX COR-90E Alinco Fair Dual band
CF -306A HFNHF/UHF Duplexer £37.00 AX FT -5200 Yaesu V. Good Dual band mobile ....... £499
40-2CD 2-ele 40m Yagi £469.00
6M/2M/70CM Triplexer £54.95 AX FT -530 Yaesu V Good Dual band hand-held £369
A3S 14-21-28MHz Yagi £349.00 CFX-514 .

AX DJ -180 Alinco Good 2m hand-held £169

A3WS 12117m 3-ele Yagi £275.00 CF X-431 2M/70CM/23CM Triplexer £49.00 AX C-500 Standard Good Dual band hand-held £225
A103 30m Extension A3WS £115.00 CF -520 2M/6M Duplexer £29.00 AX IC -220 Icom Good 2m hand-held £179
204CD 4 ele 20m Yagi £469.00 AX IC-W21ET Icom V Good Dual band hand-held .... £299

154CD 4 ele 15m Yagi £279.00 AX IC-2GE Icom Fair 2m hand-held £165

04 Dipole 10/15120/40m £249.00

TELEX HY-GAIN AX FT -530 Yaesu Good Dual band hand-held .. £399
V. Good 21n170cm handle v charger ir me. 0285
D3W Dipole 12/17/30m £189.00 TELEX HY-GAIN HF ANTENNA AX FT -470 Yaesu

AX 0844 Stand Fair Hand-held £50

A4S 3-4 ele Yagi 10/15/20m £439.00 12AVQS 10-15-20m vertical. 4.1m £109 C AX IC -02E Icom V Good 2m hand-held v bit £150
14AVOiWBS 10-15-20-40m vertical. 5.5m £159 C AX FT -728 Yaesu V Good Transceiver £299
VHF Antennas
DX88 10-80m vertical £315 C AX M4OFM HRC Good Transceiver £45
AR -270 2170 Dual Band Vertical 1.13m long £65.00 AX TEMPO Good 2m hand-held £88.99
£89.00
DX77 10-40m vertical £369 C
AR -270b 2170 Dual Band Vertical 2.3m long BX FT-270RH Yaesu Good 2m FM mobile C199

AR2 2m Vertical 12m long £35.00 BX TS -700 Trio Good 2m all mode base Tx/Rx C289

AR6 6m Vertical 3.1m long £59.00 ANTENNA ROTATORS LX 0J-580 A Trace Mint VHFAJHf hlxld v mc. DC no £380

CD45 Antenna rotator. meter LX TH-21 Kenwood Fair 2m hand-held.._ £145

A148 -10S 2m 10-ele Yagi 13.2 dBd £65.00
A144 -20T 2m 10-ele Cross Yagi 12.2 dBd £99.00 controller £315 D
13B2
1762
13-ele 2m Yagi
17-ele 2m Yagi
£99.95
£189.00
HAM"IV Antenna rotator, medium
£449 D
°a.' PHONE NOW
duty, meter controller
A50 -3S 3-ele 6m Yagi £75.95 PX = Southampton (01703) 255111
HAMV Antenna rotator, medium
A50 -5S 5-ele 6m Yagi £149.00
duty, digital controller £749 D AX = London (0181) 997 4476
A50 -6S 6-ele 6m Yagi £229.95
T2X Antenna rotator, heavy RX = Axminster (01297) 34918
424B 24-ele 70cms Yagi £115.00
duty, meter controller £525 D LX = Leeds (0113) 235 0606
22X6 2m 22-ele Yagi cAv polarization switching £229.00
7382 T2XD Antenna rotator, heavy (0121) 327 1497
70cms 38-ele Yagi c/w BX = Birmingham
polarization switching £199.00 duty, digital controller £795 D
Showroom /Mall Order 9 30-5pm, 9-lpm Sat. Tel: (01703) 251549.

SMC Ltd HQ Southampton: S M House, School Close Chandlers Ford Ind Estate, Eastleigh, Hants S05 3BY. Tel: (01703) 255111 Fax: (01703) 263507

ARE Communications: 6 Royal Parade Hanger Lane, Ealing, London W5A 1LT. Tel. 0181-997 4476 9. 30am - 5.30pm Monday -Friday 9.30cen - 1.00pm Saturday
Reg Ward & Co: I Western Parade, West Street, Axminster, Devon EX13 5NY. Tel. (01297) 34918 9.00am -5.15pm Tues-Sat
SMC (Northern): Nowell Lane Ind. Estate, Nowell Lane Leeds. Tel. (0113) 235 0606 9.30can - 5.00pm Monday -Friday 9.00arn - 1.00pm Saturday

SMC BinninghCM1: 504 Alum Rock Road Alum Rock Birmingham B8 314X. Tel 0121-327 1497 9 00am - 5 00pm Tuesday - Friday 9.00arn - 4.00pm Saturday
Carriage: Base Antennas 19.50. Mobile Antennas 15.00. Station Accessories 15.00

Practical Wireless, December 1995 3

 C.M.HOWES
COMMUNICATIONS
Mail Order to: Eydon, Daventry,
VISA
Northants. NN11 3PT
_ 13' 01327 260178
There are lots
adlift
R% Wu, Filter Kit£ 1.90
Hardourr pack: 113.90
Alone Os.
IlardwaN
Kit: 19.80
trait, Speech Processor Kit: £16.80
Apra! Readout Kit: /49.Soi1
Hardware Pack: 124.90

-410.14f
more kits in our
free catalogue!
A

Hardware Pack. £11.90 Please send an SAE for your copy

Top Value RECEIVING ATU L HOWES RECEIVER KITS

Covers 500kHz to 30MHz. Increases wanted signals by The "PW Daventry" 40M high performance superhet
impedance matching, and at the same time helps reduce sem to receiver featured in Practical Wireless (Sept. & Oct. issues) is an
spurious signals and interference. Kit contains case with smart printed front panel plus all interesting project for those looking to build a slightly more
other parts and hardware. Reviewed in the December SWM. Great performance and value! advanced receiver that can outperform much more expensive
CTU8 Factory Built: £49.90 CTU8 Kit: £29.90 general coverage sets. DAV40 electronics kit: £69.90. HA4OR hardware pack: £27.90.
SHS1 meter: £8.90. If you need a receiver to dig out the DX on 7MHz, this is the project!

The famous HOWES Active Antennas MULTI -BAND SSB/CW RECEIVER

The DXR20 covers 20, 40 b 80M bands with optional extra
AA2 150kHz to 30MHz ACTIVE ANTENNA band modules for 160M, 30M, 15M or 10M amateurs or
The neat compact answer for those with limited space, holiday use, mobile operation 5.45MHz HE air. Many high performance features in this
etc. Two selectable gain settings, local or coax powering (12 to I 4V). Good strong excellent direct conversion design!
signal performance, IP3 +38dBm. Easy to build, and much liked by customers! DXR20 Kit: £39.90, DCS2 "S meter" Kit: £10.90. HA2OR hardware pack: £28.90
AA2 Kit: £8.90 Assembled PCB Module: £13.90
AA4 ACTIVE ANTENNA FOR SCANNERS M1.7411 Medium wave + 160M Beginners' Receiver Kit. Easy to build,
Covers 25 to 1300MHz. Broad -band performance in a neat, compact package. lust complete kit package with hardware only £29.90! plus Ex; P&P)
410mm (16") long. Excellent performance in a small space! We have other receeversm our range. Electronics Kits start al £15.50 for the THE 3 SW broadcast Re. and k I b 90 for the Mix
AA4 Kit: £19.90 Assembled PCB Modules: £27.90 single band SS8/00 Rx. Optional harware and accesory lots are available Pease phone us to discuss the details.

AB118 AIR -BAND ACTIVE ANTENNA

Optimised for long distance reception on 118 to 137MHz air -band. Tuned antenna PLEASE ADD &JIB P&P, or f.1.50 P&P for electronics only kits.
with pre -amp & band-pass filter. Hear ground stations you've never heard before!
AB118 Kit: £18.80 Assembled PCB modules: £25.90 HOWES KITS contain good quality printed circuit boards with screen printed parts
locations, full, clear instructions and at board mounted components. Sales, constructional
MB156 MARINE BAND ACTIVE ANTENNA and technical advice are available by phone during office hours. Please send an SAE for our
156 to 162MHz marine band active antenna system. "Pulls in" those distant signals! free catalogue and specific product data sheets. Delivery is normally within seven days.
MB156 Kit: £18.50 Assembled PCB modules: £25.60 73 from Dave G4KQH, Technical Manager.

This Month
WXSAT Special
Review - Yupiteru MVT-7200 Scanner
There's Life in the Old Dog Yet!
rnational Short Wave Broadcasting
R1155 External PSU and AF Stage
Radio Austria International
Timewave DSP-59+ A User's Perspective
On Sale Now!

Coming Next Issue - December

European 1st Drake 8A - Review
adiosondes
Memories of Police Radio
Radio Alianza
Expedition Earth 2000
A Day in the Life of GMS
Plus all the Regulars
On Sale November 23 -
Order Your Copy Today!

4 Practical Wireless, December 1995

 Spring 1996 Edition DR -610 2M & 70CMS The Ones Tuned
Out Now! 50 Watts 2m 35 Watts 70cms WATsON For the UK Bands!
coo 128 Pages ALINCO AM/FM Wideband Receive,
Rodo .

No other range offers the same value

Of Products 120 memories CTCSS
coo\cque or the performance!
LA Editorial
-e .'Mobile Models £15
W-285 2m 5/8th
3.4dB 200W
as The best dual band mobile we know of. Ex-
£15.95

tr, tremely compact and very easy to use. W-770HB 2m/70cm

ICOM IC -706 HF to 2 Metres 3/5 5dB 200W

a 1996 Eamon
£24.95

Hatch/Trunk 5 metre cable kit

Mount W-3HM W-3CK
Our Spring 1996 catalogue is out now 128
pages packed with Ham Radio products and
accessones plus interesting articles and tech-
nical information. £1.50. or £2 00 by post
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8 Practical Wireless, December 1995
 In the last few weeks I' e met
Ne
contractors who run the licensing
many really frustrated people. operations on behalf of the Department
Why are they frustrated? They're of Trade & Industry.
trying to find somewhere to take I'm looking forward to the visit (on
a Radio Amateur's Examination Wednesday October 25) and learning a
course and finding it very difficult to do lot more about SSL (a subsidiary of the
so! Britain, and he would like to hear from Post Office) and how they work. And of
And if they eventually do find anyone having problems in finding an course, I intend to keep PW readers
somewhere that's running an RAE RAE course or in sitting the fully informed on what I learn from the
course, they've then got to clear the examination. You can write to Paul at visit.
final hurdle and find an examination 287 Heol-y-Coleg, Vaynor, Newtown, And, as I write this, the service from
centre! Obviously, since Colleges and Powys, Wales SY16 IRA or telephone SSL seems to have improved. We
Further Education Centres have gone him on (01686) 628958. Your letter or certainly don't get the number of
'fully commercial'...a real problem has 'phone call could help Paul to help you complaints we used to, or is it that
appeared on the horizon for our hobby. and many others! frustrated readers have given up?
So, if you are finding it difficult (or However, I've no doubt that if you have
have found difficulties recently) I would Subscription Services a problem...you'll write and let me
be pleased to hear from you. However, know! Cheerio for now.
there's someone else who is specifically Finally for this month, I should perhaps
aiming to help frustrated RAE mention that I've been invited to the
candidates and he needs to hear from Bristol headquarters of Subscription
you directly. Services Ltd. And if you hold an
Paul Essery GW3KFE is 'Zone E' amateur radio licence or CB radio
Member of the Radio Society of Great licence, you'll realise they are the A906 AorioirOA/10

COPIA!!: ;074.k)111 I N

cr,bot its oifference

It seems as though everyone in the PW office has entered into the spirit of
the 'workshop and test equipment' mood. 'Tex' Swann G1TEX is trying to
resuscitate his Reliant Three-wheeler again, there's Zoe mending her
typewriter while the Editor and Donna 'Toad' Vincent are trying to repair
one of G3XFD's artificial arms (while he's wearing his new electronic right
hand!). It's left to our guest (Worthington GW3COI himself) to do
electronics! See if you can 'Spot The Differences' in the two cartoons and
win a prize!
There are 12 differences to mark on the bottom version of the
cartoon this month, good luck.

Name

Callsign
Address

Postcode
FIRST PRIZE: A year's subscription to Practical Wireless or a £20 book voucher.
SECOND PRIZE: A six month subscription to Practical Wireless or a £10 book
voucher.

SUBSCRIPTION U VOUCHER

Entries to reach us by Friday 21 December 1995.

Send your entry (photocopies acceptable with corner flash) to: Spot The
Difference Competition, December 1995. PW Publishing Ltd.,
Arrowsmith Court, Station Approach, Broadstone, Dorset BH18
BPW. Editor's decision on the winner is final and no correspondence
will be entered into.
.11

Practical Wireless, December 1995

Please send your letters to the
Editorial offices in Broadstone.
! Vil N (10 Thei SIStar Leei
will receive
Reader's letters intended for a voucher worth
publication in 'Receiving You' £10 to spend on
must be original and not be items from our
duplicated. Letters are accepted on the Book or other
understanding that they have only been services offered by
submitted to Practical Wireless. Please ensure Practical Wireless.
that your letter is clearly marked 'for publication \cil All other letters
in Receiving You' and that it has not been will receive a £5
submitted to other magazines. We reserve the voucher.
right to edit or shorten any letter. The views
expressed in letters are not necessarily those of
Practical Wireless.

Tri-Band Beam Antennas

Dear Sir
A * * STAR LETTER *
I note with interest the letter from
Z21KIR/G7URW in your October issue, Mr Tucker Dear Sir
needs only to buy a copy of the Beald Antenna For some time now I have intended to write to PW about publication of h.f.
Handbook by W6SAI and W2LX. This excellent antenna designs, particularly with a view to building. After reading the letter by
book contains all the whys and wherefores of Nigel Tucker Z21KIR/G7URW, I decided to write in.
Yagi beam construction and design. There are Firstly I would refer you to your reply to that letter, ie. h.f. Yagi design could
several multi -band designs included, even a log make a ve:y practical article! This is very true. However, if you decide to go ahead
periodic, which is, of course, trapless. in a future issue, feel compelled to ask you to make it a 'good one'.
I

There was also a letter from G3A1 0 in the By good, I mean it would have to posses the properties, or nearly so, of a
same issue who is wrestling with the problems trade antenna, such as say a Cushcraft or Tet, etc. and show individual
of a small garden. My garden is only 36 x 23ft. components, also specify materials to carry full dimensions as Nigel's letter
and up to now I have restricted my activities 'o states, having said that, its height, etc. must be left to the individual
20m and upwards. I have used various home- circumstances, as the designer would have no influence over these issues.
brew antennas including dipoles, delta loops and I have obtained countless drawings and articles over the years, but never
best of all, a ground plane. once a good, fully dimensioned design. I have seen, for instance, capacitors
I use the antennas and experiment, apparently hanging from sky hooks, etc.
dismantling them when not required. All this My other hobby is model engineering, and while I recognise the difference
activity has aroused the curiosity of my between aspects of the two hobbies, I can tell you that the magazine Model
neighbours who have been invited in to see the Engineer would not exist without the projects it publishes being fully
station working. dimensioned. So many radio magazines will tell the reader how to produce and
They all seem to be on my side. One of them assemble a project, however, a simple drawing would save a lot of script and
got breakthrough on his new TV so I 'loaned' crystal ball gazing!
him a TV filter to good effect. This same I also recognise why PW exists and for sure it is not mechanical engineering
neighbour has now offered the use of his garden in itself, but it is very closely allied, without mechanical engineering amateur
for antenna experiments as well! The secret radio would not exist. For a long time now I have asked myself why this particular
seems to be to get to know the neighbours well problem prevails, could it be pressure on Editors by the trade not to make things
and take down your antenna when not in use. too easy, or the inability of those who aspire to design and offer for publication
Finally, to render my antennas 'invisible'I the result of their work? I do not believe the former, but the latter could be true,I

make them out of clothes line from the local sincerely hope not.
supermarket. This stuff is brass -plated, multi - Finally, my thanks to Nigel and to PW (despite the criticism). So, come on all
strand steel wire covered in plastic. It solders of you and make it more interesting and dare I say more practical.
well, is very strong, will handle up to full legal Don Birch GOORM
power and is very cheap. Best of all, the Cumbria
neighbours think the washing line has been left
out, if it's configured as a long wire! Editor's comment: We try our best Don, that's why whenever possible,
P. J. Halls G4CRY PW prototypes of projects intended for publication (including antennas)
York are built and commented on. But you can be sure we'll carry on trying to
make our projects even better!

Dear Sir banders, which after all are article would take up many regular 'Antenna Workshop'
Home-brew 'Tri-Banders'. I more effective than trapped pages of a magazine and few articles, Mr Tucker will find
have just read the letter from antennas. To have a 7MHz Yagi readers would have the time or something that he can build
Nigel R. Tucker which tells us that will be effective for DX the skills to replicate the design. cheaply and which will certainly
that he cannot find details for work, an antenna support at Can I suggest Mr Tucker work first time.
the making of tri-band Yagi least 20m high is needed. purchases a copy of that By the way, I can walk up
beams centred on 14MHz. I Making any kind of multi - excellent publication Beam masts that are 40ft high which
suppose he means an antenna element Yagi beam requires Antenna Handbook by Messrs. have their bases secured to one
that will work on 28, 14 and engineering and radio skills. It Orr and Cowan (see PW Book of my apple trees!
7MHz. I doubt if he will ever would be difficult to find the Service list)? There's also the John Heys G3BDO
find constructional details of materials and their cost would book HF Antenna Collection Guestling
such an antenna. come to about the price of a published by the RSGB, again
Tri-band Yagi beams are commercially available beam available from PW Book Editor's comment: John
very difficult to design and even antenna. Service. G3BDQ is of course one of
more difficult to fabricate. This The problems I have My DX work on h.f. has all our team of 'Antenna
is why the antenna 'Bible' the outlined account for the lack of been done when using wire Workshop' authors. And don't
ARRL Antenna Book has no tri- information on home-brew, tri- antennas and I feel sure that Mr forget, if you have an
band Yagi designs. band Yagis in radio magazines Tucker could put up Vee beams interesting antenna idea, you
There is lots of information and antenna books. A or even Rhombic antennas to can share it with other
on the construction of mono - comprehensive constructional good effect. If he scans the readers!

10 Practical Wireless, December 1995

 Transceiver Conversions Scanners
Dear Sir Dear Sir these things and the many CBers use p.a.s, this
Further to your 'Keylines' comments in Re - Letter from Mr Page, diagrams that go with is probably true, but on
the October edition of PW, I Tyne & Wear. Mr Page's them, the filtering, if any the other hand, there are
wholeheartedly agree with your letter in your September is very rudimentary to many stations out there
sentiments as to the purchasing (by 1995 magazine raised say the least! who run just the legal 4W
amateurs) of 27MHz multi -mode radios some interesting points I If you want to stop and are quite decent to
for conversion to 28MHz operation. For would like to explore. illegal p.a.s being used, talk to. live in the east
I

many years now, we, as amateurs, have Firstly, he mentions then outlaw their end of Glasgow and yes,
been restricted by the powers that be the fact of unauthorised importation into this there is a problem of
from purchasing, possessing (dreaming 'eavesdropping' on country. They are no use people using illegal p.a.s,
of!) any form of radio that could telephone conversations for a.m. or s.s.b. as Mr and 50W is not
conceivably be utilised by 27MHz and the Emergency Page points out, they are uncommon!
operators. Services communications. designed for constant Hopefully, the
As you stated, these multi -modes CB He quite rightly points out amplitude, i.e. f.m. (even amateur radio fraternity
sets are readily available, not only as that the police, in certain then that's debatable!). will remember before they
second-hand units on Bring & Buy stalls parts of the country, have My last point is, there criticise CBers, that there
at rallies, but also openly available from started to scramble their still seems to be, after 14 are lot of decent stations
various retail outlets here in the UK. radio traffic. years of legal CB, a 'them out there to talk to (you
Therefore, if CB sets of this nature are I however, totally and us' attitude between should give CB a try
filtering into Britain and are not being disagree with his remarks CBers and 'Hams'. Surely sometime). I see things
stopped in their tracks, then why can't that possession of this can't continue, if we 'from both sides of the
we as legal operators purchase 28MHz scanners should be illegal. want to progress beyond coin' so to speak. How
radios? There are people who do this ideology that holds us about a CB Radio Club
I believe the time has come for the actually use them legally. back. After all, they are and Amateur Radio
Radiocommunications Agency (RA) to I myself used one a few just different faces of the Society?
change their attitude to this subject. years ago to monitor the same hobby - radio! Ian McCallum
They (the RA) have already endorsed local 144 and 430MHz Mr Page implies that Glasgow
ETS 300-433 as a European a.m./s.s.b. amateur bands locally and
CB standard, so surely now this new listened to nothing else.
broad-minded attitude should apply to For him to suggest that Dear Sir
amending the legislation appertaining to everybody uses them in Adam Page's letter
The factual inaccuracy
10m equipment (be it CB conversions or illegally is total regarding scanners in the September issue of PW
commented upon
proper rigs, i.e. Uniden 2830, etc.). 'hogwash'! went un-challenged - or even that it is 'illegal to
Please keep this subject in the news, it's Other countries have a by the Editor. The writer asserts them
a good cause. good system of use' scanners and that 'nobody uses
completely factitious and I am
John Wheeler GOIUE prohibiting unauthorised legally'. This is to point
Wiltshire monitoring by 'Joe surprised that the Editor didn't bother
Public'. It is called this out. with perfect
encryption - the 'good old Scanners are bought and used - radio
US of A' has been doing it legitimacy - by many people including
cheap way of
for years! Only in the last amateurs. They provide a relatively (amateur)
few years have our police monitoring a number of v.h.f./u.h.f.
'High Flyer' Antenna forces cottoned on to this bands, looking for band openings or
just to
notion! monitor local activity. All quite legal!
Dear Sir should be
Ref 'High Flyer' antenna, November PW. My second point is His (Mr Page's) comment that "it to be
regarding his comments illegal to possess radio scanners" seems
On reading Clive G4SLU's report on the bureaucratic
PW version of my 'High Flyer' design, I on CB radio, specifically pandering to a further increase in
power amplifiers (p.a.$). dictatorship. Perhaps it would make Thou sense to
am left wondering why it did not work shalt not
properly, giving an s.w.r. of 2:1 instead Again I agree with most of sweep away much of the ludicrous liberal regime of
his comments with regard listen laws and adopt the more
of 1.2 to 1.0. If you reduce the length of listen to
the antenna to raise the frequency and to these illegal items, but I North America, where it is quite legal to
feel that his argument is anything you like, even the police.
pull out the tuning rods to lower it back
to 18MHz you now have the the still lacking in details Gareth Jones GW4KJW
'IndoCap' further into the current somewhat. I have seen Gwent
section, which would induce more
capacitance and raise the 'Q'.
Ruling out any bad connections it is Dear Sir
possible that the antenna was tuned to a Re - correspondence from Adam Page of Tyne & Wear where he states that it is illegal
shallow secondary resonance, which this to use a scanner. This statement is not entirely accurate.
type of antenna seems to have. Another I use my scanner legally whilst monitoring the amateur bands from 28 to 430MHz.
probability to that the tuning rods are The activity outside of the amateur bands does not interest me and this is the only
going back through the coils. It's twelve area where the use of a scanner would be illegal so far as the radio amateur or short
months since I worked on this antenna, wave listener is concerned.
but I believe this can upset things. I hope Jack Cunningham GM3JCC
these few points may help any Scotland
constructors who have problems.
Victor Goom G4AMW Editor's comment: I thank the (very) many scanner users who have written
Dorset to defend their use. As the point has been well made by the letters selected
for publication, the correspondence on scanners is now closed.

Practical Wireless, December 1995 11

Mobile Datong Electronics
Outbackers
Nevada Datong Electronics of Leeds would like to
point out their full postal address is
Communications
of Portsmouth have Clayton Wood Close, West Park,
recently announced Leeds LS16 5QE and that their
two new Outbacker
telephone number is 0113-274 4822
mobile antennas
and FAX number is 0113-274 2872. If
you have recently tried to contact Datong
designed for use
with the 'corn 706 by FAX without success this is because
and the Alinco DX - Send in your news, photographs and an error crept into the FAX number
70. product information to Donna Vincent details given in their recent adverts.
Firstly there's G7TZB at the editorial offices in We apologise for any inconvenience
The Outbacker Perth Broadstone. caused by this error. PIN
Plus which is 1.8m in
length, can be used
to operate on the
3.5, 7, 10, 14, 18, 21, QRP Is Alive in Dublin
24, 28, 50 and The Rev. George Dobbs G3RJV reports on the first
144MHz bands and International QRP week that was held in Dublin at the
is rated to 100W. end of August.
This antenna also
has a 1.8MHz option The promise of QRP and a visit to Ireland was too much
available. The to turn down, so I gratefully accepted an invitation to be
Outbacker Perth Plus a speaker at the first International QRP Week in Dublin
costs £249 including at the end of August. The event was held at the Marino
VAT. Institute of Education on the north side of Dublin. Donal Leader El8E1B,
The second new The Marino institute is an impressive building set
Outbacker is known
Director of the Marino
in its own grounds and run by the Order of Christian Institute, presents a time
as the Junior Plus Brothers. Donal Leader EIBEIB, the Director, is a keen
and covers the 3.5,
and weather station to
radio amateur and member of the G QRP Club. G3RJV.
7, 10, 14, 18, 21, 24, The QRP week included a series of lectures,
28, 50 and 144MHz bands. This antenna is practical amateur radio construction, under tuition, in
described as being easy to use, low profile an electronics laboratory and metal work in a fully
and does not require a tuner. The Junior equipped workshop. The event also included a fully working QRP Station with the
Plus costs £225 including VAT. special event callsign EI3RJV.
Both the Perth Plus and the Junior Plus A programme was arranged which allowed plenty of time for sightseeing and
allow you to change the antenna tip to use exploration of Dublin. The week was a great success for all who attended and the good
the antenna on 50MHz. news is that further events of a similar nature are planned for the future.
For more details on the full Outabcker On the final evening members were treated to a reception for the formation of the
range of antennas contact Nevada QRP Club Of Ireland. I was honoured by being invited to give the inaugural speech to
Communications, 189 London Road, launch the club.
North End, Portsmouth P02 9AE. Tel: The Chairman designate, Bill Ryan EIBBC, then presented me with a fine
(01705) 698113. laminated certificate as the first member of the new club. There seemed no end to my
good fortune as the Director presented me with a time and weather panel. After a fine
buffet and a lesson in choosing Irish Whiskey, all of my fine opinions of the Irish were
confirmed!
Pascoe's Penny Pinchers The visit to Dublin gave me a fine
Dick Pasoce GOBPS has written excuse to explore a little of Ireland. The
various antenna articles over the years event itself allowed time to visit Dublin
for PW, and is well known in the world of with my wife, Jo -Anna GOOWH and my
amateur radio for running Kanga fellow speaker Dick Pascoe GOBPS.
Products and more recently has The combination of QRP and my interest
produced a book entitled Pascoe's Penny in Celtic culture is certainly a heady mix.
Pinchers - A collection of Wire Antenna's When future events are planned by the
that can be built for pence, not pounds. QRP Club of Ireland, will be itching to
I

(The title incidentallly has been 'stolen', return. I can well advise others to join me.
with permission from Rob Mannion The QRP Club of Ireland is open to
G3XFD, from one of GOBPS's articles George G3RJV and Dick GOBPS at the anyone. For further information write to
which appeared in PW!) gate of the Marino Institute of Bill Ryan El8BC, c/o The Marino
Pascoe's Penny Pinchers is an A5 Education which was the venue for Institute of Education, Griffith
sized book comprising of 36 the International QRP Week. Avenue, Dublin 9, Ireland.
comprehensive pages which cover
everything from the simple ground plane
antenna through directional arrays and
feeders to hints on trimming and cutting Poole Novices The Novice Booklet is
split into three main
whilst the third section
covers topics of specific
for resonance. Dick GOBPS is hoping that
this publication will be the first of three, The Poole Radio Society sections. The first section interest to B Class Novices.
the others will follow in the near future. have sent the 'newsdesk' a offers guidance on topics of Copies of the Novice
A copy of Pascoe's Penny Pinchers copy of their recently relevance to both Class A Booklet are available from
will cost you £4.95 plus £1 P&P and is produced Novice Booklet. and B Novices which will, it Colin Redwood G6MXL,
available direct from Dick Pascoe at This is aimed at B Class is hoped, be of 45A Lulworth Avenue,
Kanga Products, Seaview House, Novices and concentrates considerable interest to all Hamworthy, Poole,
Crete Road, Folkestone, Kent CT18 on providing practical newly licensed radio Dorset BH15 4DH for £5.
7EG. advice and help to those amateurs. The second Cheques should be made
who have recently obtained section covers topics of payable to Poole Radio
their Novice Licences. interest to A Class Novices Society.

12 Practical Wireless, December 1995

Hoddesdon Radio Your page - your
Club story! The local
The Hoddesdon Radio Club is Amateur Radio Club
only in it's fourth year, yet is
nearly fully equipped. Part of its is seen by many as
success is due to the very varied being the 'backbone'
programme, ranging from
astronomy through, beer and
of our hobby. There
wine making to visits by the are some interesting
RSGB President. Send your information to the
stories to be told, so
The membership includes `Club Spotlight' newshound let's hear about your
Novices, short wave listeners
and CB enthusiasts and also has zoe Shortland at the PW Offices. club history, share
many wives and girlfriends
the information and
attending meetings. Members
meet at the Conservative Club in
Club Logos you'll probably recruit
Rye Road, Hoddesdon, When sending in items for inclusion in 'Club Spotlight', if your club
Hertfordshire, and visitors are has a logo we would also appreciate a copy, so that it can be used
new members at the
always welcome. when featuring your club. If there is a history behind your club logo, same time!
The club's quarterly we'd like to know about that as well. Editor.
magazine is the envy of many
and regularly contains over 30
pages, packed with information. available to those who wished to
The magazine is produced by the take them.
club's Treasurer John G4VMR, The Mayor of Warwick,
who owns the Hertfordshire Councillor Mrs Christine Hodgetts
Display Company. was met by the Chairman, Brian
The club is twinned with the Clulee GOLXG, and was escorted
Indian Mound Radio Club in around the exhibits.
Florida and through the
magazine, articles are of interest
to both clubs. The Hoddesdon
RC also take part in local events,
like the Hoddesdon carnival and
next year members will be fund-
raising for a national charity in
special event stations and having
'guess the distance'
competitions.
An annual dinner is held in
March, for the 50 members, and everything up and running by G7BVV, who travelled down
the club is always on show at the 12.30hrs! from Tadcaster to help out. All in
Picketts Lock Rally. Further There were obviously many all, the society had a 'jolly good
details can be obtained from the jobs to be tackled, tents to be time' and feel that the event can
Secretary, Dave G1CAY on erected, antennas to be strung only stand them in good stead
(01992) 460841. up, the tower to be winched up for any future contests or events.
and safely checked, equipments
to be installed and checked and,
Stourbridge's of course, one vital piece of kit,
the trusty generator, which, by
Open Evening
Field Day the way, was fed with leaded fuel Back on Tuesday September 12 John G1WXF demonstrating
Stuart J. McKinnon GOTBI for the first 12 or so hours. 1995, the Mid -Warwickshire 144MHz with Chairman Brian
took immense pleasure in taking However, once the society Amateur Radio Society held GOLXG and Mayor of
part in this year's HF SSB Field bought it some unleaded to an open evening, which took Warwick, Christine Hodgetts
Day, with the Stourbridge & drink, apparently it purred just place at the club meeting rooms. in background. (Spot the
District Amateur Radio like a kitten! A wide range of displays Practical Wireless magazine!)
Society, of which he has been a During all of this, it must not illustrated the
member for almost three years be forgotten that an army does varied interests
now. The site chosen was approx not march on an empty stomach! of the
215m a.s.l. right on the Stuart's XYL Anne and another membership.
Shropshire/Staffordshire border, Ann, XYL of Frank GORXO, Home
and with the height advantage Ann, did the society proud by construction and
on one hand, and the loan of a providing excellent catering the use of
20m tower from Strumech in the facilities in the mess tent, loaned computers in
other (thanks to Mr David and erected by Eric G7JWJ. radio circuitry
Taylor), the society set about Although the society had several illustrated the
organising the chosen site, groups of operators and a technical and
something the club had not done reasonable shift system in practical aspects.
for a good many years. operation, the contacts that were The RAYNET
There were various tasks to made were by no means as display was
perform, and Stuart was many as some of the stations popular and
delegated as site manager some that the society worked. aroused
weeks before, everyone else was Stuart would like to thank all considerable interest. Mayor of Warwick Christine
doing the lifting and putting the members of the society who Amateur stations were Hodgetts being shown a Lake
together, etc. Having arrived on took part in or contributed to the active on air throughout the Electronics kit by Chairman
site at 08.45 local time, the running of the event. The society event and many magazines, Brian GOLXH with Treasurer
society was astonished to see even had one member, Julian leaflets and posters were freely Peter GOIHH in background.

Practical Wireless, December 1995 13

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for the latest details.

Running Out Of 'C' For Radio Beginners of all Ages. There are also radio clubs
Cal!signs in West Manchester and South
Elaine Richards G4LFM, PO Box 1863, Manchester. At least if you get
It's finally happened - the involved with a club Lawrence,
Radiocommunications Agency Ringwood, Hants BH24 3XD. you should be able to get help
are running out of 'G' learning the Morse Code.
callsigns! Don't panic, it
This month Elaine Richards G4LFM has some
doesn't mean that you won't interesting news on callsign allocations, reciprocal
be able to get a licence, just QSL Cards
that there will be a new series licensing, unusual radio clubs and much more.
of callsigns, the 'M' series. I'm not sure whether I've
If you have passed your mentioned Adur Village
Morse test and want to be one 'search and pounce'. Press before, but I've recently
of the first 'M' callsigns on the This is where you tune seen about 25 sample QSL
air, then you can reserve a the band and call the cards from them. The unusual
callsign now and then sit tight other contest stations thing is that they were all
and wait for it to be issued. instead of 'running' a different and ranged from
You can still reserve 'G' pile up of your own. simple black ink on coloured
callsigns until March 31 next
year.
If you already have a Class
A 'G' callsign, you can't
After a few hours
of roaming the bands,
you will feel a sense
of accomplishment as --N
dl
0
ay'
card (usually just a simple line
drawing on them) through to
four colour drawings or
photographs.
change it for one of the new your log fills up with MCC NT 1.111...., nil. XIV Each card is individual
ones though. It will be contest QSOs. Now is because it was
interesting to see the pile-ups a great time to get your feet created by the
that the new series of callsigns
will cause on the air until
everyone gets used to who an
wet as there are many local
contests coming up over the
winter months.
Pr .....,
purchaser. They have
sent their sketches
and photographs to
'M' callsign is. If you want So, jump in and join in. Adur Village Press
more details about the Everyone started the same
ZD9SXW I and awaited the
impending changes, then you
can talk to the
Radiocommunications
way!
uniii401 37 12V
SCUM, 111r.As rte

Zwr 38
proof. Adur have
designed and printed
over 400,000 QSL
Agency Amateur Radio Reciprocal W. ..Cr,
LOC IMMO'
MC1.7
cards for about 50
Unit on 0171-211 0211. Licensing DXCC countries.

Lawrence Selvestian has which will CO WORLD-1E10E DI CIE CONTEST 19/3

written to me from Manchester (hopefully)
59(9) DX Report where he is a student at the upgrade his
CAYMAN ISLANDS
ZOO a

Last month I passed on some

hints sent to me by Bob
Nadolny WB2YQH, the
start of a two year BEd course.
He's from Malaysia and has a
B licence there with the
callsign 9M6A1.
Malaysian licence
to the A standard
required to get a
reciprocal licence.
ZF2WW SRAM! CAYMAN
Publisher of 59(9) DX Report.
Reading through the hints he Lawrence wants to know The RSGB very
sent me I found another that whether he will be able to kindly sent all the
MOW
answers a question that many operate in the UK. After an necessary _

newcomers ask. 'How do I enquiry with the Radio Society paperwork to me

become a contester?' of Great Britain (RSGB, who and so I've sent this on to
No-one is born a contester, are always a useful source of Lawrence in Manchester. If
although some feel it is in their information) I discovered that you have any queries about
blood. Like everything else in there is an agreement between licensing, then the RSGB can
the radio hobby, repetition and the licensing authorities here be contacted on (01707)
practice bring about and in Malaysia. 659015. I must say that they
proficiency in each area. The agreement means that were very helpful (and
Contesting can be fun even reciprocal licensing is not efficient) when I 'phoned.
for the casual operator. One of usually a problem and once Another thing that will help
the easiest ways to develop the forms have been filled in Lawrence whilst he is studying
contesting skills is to enter a and duly processed a here is to go along to some of
small contest where the reciprocal licence can be the radio clubs in the Prices range from £26.95 for
competition won't be so great issued. Unfortunately, Manchester area. Now I don't 250 simple cards to £499.95 for
and you won't get scared off Lawrence only has a B licence know where anything is in 10,000 four colour ones!
from ever entering one again. and the authorities here only Manchester, but I do know that If you would like to see
Practising your quick recognise the Malaysian A the Manchester & District some examples, contact Adur
exchange of reports in a less licence. ARS are a very busy club. Village Press, 'Alamosa',
crowded band will build you All is not lost though. If There is always plenty going The Paddocks, Upper
confidence and skill level. The Lawrence can study and learn on there and you should Beading, Steyning, West
best method to follow for the the Morse Code, he can take a contact Barrie Langfield Sussex BN44 3JW. Tel:
new contest operator is called Morse test here in the UK, G3IOA on 0161-681 5406 (01903) 879750.

16 Practical Wireless, December 1995

,LLA--IA-P-PilA ILLkILL&
1444JJJJMJJJJ4,1dJ,1,14444JJJ1441
First Steps
Test And Measurement

Daril Partridge has written to me with a very common problem

facing newly licensed amateurs. I myself can remember pondering
over the pros and cons of the various frequency measurement
options.
The basic problem has always been the reluctance to divert
money that could be spent on a better station to a regulatory
necessity. I'm talking, of course, about the old chestnut of
frequency measurement.
The requirements are laid -out in Sub -clause 4(1) of the licence regular markers can then be used to verify the receiver's
and state that the Licensee must ensure that: a) "the emitted calibration and so verify the operating frequency of your
frequency of the apparatus in the Station is as free from transmitter.
Unwanted Emissions as the state of technical development for If you want to try some home construction a crystal calibrate-
amateur radio apparatus reasonably permits": and b) "whatever makes an excellent starter project. Despite the economic
class of emission is in use, the bandwidth occupied by the emission advantages of using wavemeters and crystal calibrators, the best
is such that not more than 1% of the mean power of the way to meet the licensing conditions is to get yourself a digital
transmission (NOT including the power contained in spurious frequency counter.
emissions) falls outside the frequency band". Although digital
Whilst this is all legally correct it doesn't offer much help to frequency counters are
significantly more expensive
than an absorption
wavemeter, they are far
more versatile and much
easier to use. To give you
some idea of the cost, you
can buy a new 8 digit
frequency counter that can
handle frequencies from
10Hz through to over 1GHz
for around £150. With a
frequency range as wide as
this you can see that the
counter will serve you well
over many aspects of the
hobby from h.f through to
u.h.f.
the new amateur in fact the opposite is probably more likely! The other great
Fortunately the Radiocommunications Agency do offer some plain advantage of the frequency
language advice. counter is that it gives a direct read-out of the frequency
The general guidance is that you will need a crystal reference although you do have to be careful not to overload the counter.
and an absorption wavemeter to check a transmitter that's In the final part of Daril's letter he asks if it's necessary to
crystal controlled. Crystal controlled used to imply single channel own the measuring equipment or can it just be borrowed
operation, in modern terms this extends to embrace all modern occasionally. Despite the temptation to share equipment between
synthesised transceivers. amateurs. the licence requires you to be able to demonstrate
This is because synthesised systems have a crystal reference frequency accuracy on demand. I don't somehow think the
oscillator at their heart to provide a high degree of accuracy and inspectors would accept a trip round town to collect the gear as
stability. With absorption wavemeters being so easy to build this is being acceptable!
certainly the cheapest way to meet the basic licensing conditions.
Another way to meet the basic licensing requirements is to
use a simple crystal calibrator in conjunction with a good
communications receiver. A 100kHz calibrator will produce The three photographs show a selection of frequency
harmonic outputs every 100kHz throughout the h.f. bands. These measuring equipment.

Unusual Radio ILERA are to encourage the Annual Congress of the That's all the `natterings' I
use of Esperanto for Universala Esperanto-Asocio,
Clubs international contacts by radio and to issue a Bulletin of news have for_ ou this month so,
amateurs and to encourage (normally four times a year). until next time cheerio and
A couple of months back, I Esperantists to take up A free 12 -lesson
mentioned some unusual amateur radio as an correspondence course on don't forget to keep your
radio clubs. Since then I have interesting hobby and Esperanto is available from
learned a few more details practical use of Esperanto. Paul Hewitt GONUE letters coming to me
about the International League They also aim to standardise (QTHR), who is the secretary (address at the top of the
of Esperantist Radio Amateurs the Esperanto vocabulary of of the British section. A tape
(or Internacia Ligo de technical and procedural with notes in a basic QSO colum).
Esperantistaj Radio Amatoroj). terms, to keep members in format is available for £2
The ILERA has members in 45 regular touch by organising including postage. If you are
countries world-wide. nets and contest, to set up a interested in learning more, reale qgf111
The main aims of the Special Event Station at each contact Paul.

Practical Wireless, December 1995 17

 REVIEW

7. 1 /zLLLteU 12,!
giLL -L zil

Richard Newton GORSN takes Without The Manual

a look at the latest (they've When looking at a new hand-held, or any
been incredibly busy this year!) piece of equipment for that matter I always
release from the Alinco pick it up and try and use it without the
manual. I think that this is a good indication as
production line. to how the radio has been designed.
There's nothing more frustrating than
It's always difficult to write a review and the getting a new radio and then having to sit for
single most difficult thing is finding somewhere hours with a book before even turning it on for
to start. So, I thought I would start by fear of doing awful harm. However, in this
congratulating Alinco. respect, the Alinco D1-191 is very simple to
Presentation counts for a lot these days and use.
this hand-held comes with a very nice 'stand- To demonstrate its simplicity I gave the
in' charger, a highly durable helical antenna transceiver to several non -amateurs who were
and the normal carry strap and belt clip. all able to figure out the basics. And on the
The DJ -191 is very smartly finished in
more advanced features I looked at the manual stretch out of the 'Velux' window could only
black plastic and metal and it also seems very and found it to be very well written, easy to get a 55 report.
light for its size. The radio itself is uncluttered, understand and follow. I'm not an advocate of comparing one
relying almost entirely on push-button
radio to the other, however I feel compelled to
controls. Volume And Squelch mention that this is the first radio that I've ever
The only rotary switch is used for tuning
used at my home that has not received GB3SC
through the v.f.o. and memory ranges. It also The Volume and Squelch controls on the DJ - as an almost fully 'quietening' signal.
controls certain menu options (all other 191 are press -buttons. I was a little dubious of Of course, I realise that the 'bar graph' type
functions are done by push -buttons).
this at first. However, positive pressure has to 'meters' on modern hand-helds are not
The transceiver has the normal controls be applied and this reduces the possibility of necessarily a fair indication of actual signal
you would expect to find. However, there are accidental usage of these controls. strength. For this reason I always listen first and
two Press -to -talk (p.t.t.) switches, and I'll say a The Squelch is adjusted by depressing the decide on a report 'by ear', and find this a fair
little more about this later. Alinco have Function key and then activating the buttons. measurement.
included standard Speaker/Microphone jack When activating the secondary functions of One possible reason for the receiver's
sockets for extensions and also for external any key on the DJ -191, the operator depresses apparent lack of sensitivity is that the
power connection.
the Function key, (not unusual I hear you say). transceiver has an extended receive capability.
The Alinco DJ -191 is large by modern
But, the slightly unusual aspect on this radio is I wonder if perhaps this particular unit has
standards. It has very big, well labelled buttons that while doing this the operator has to been optimised for a centre frequency out of
and the only rotary switch is, again large and maintain pressure on the Function key the amateur band? I also replaced the supplied
very easy to operate. throughout the operation. helical antenna with a telescopic, this did
The 'double button' technique makes improve things, but the receive side still
Display Selling Point operating secondary functions a little seemed to be somewhat 'down'.* See Editorial
cumbersome. It would have helped if the note below
The DJ -191's large display is the main selling Function key had a short delay allowing these I should also mention I did hesitate to
point in my humble opinion. I've never seen adjustments to be made one handed. include what could be seen as a criticism, for I
one as good as fitted on this radio! do feel that, on the whole, this is a good little
All the display characters are massive. The Many Transceivers radio. And why do we expect a hand-held
main frequency display characters are about a radio to be as sensitive as a base station? After
third of an inch in height. The secondary I've been fortunate to have the opportunity to all, a hand-held is meant for essentially local
indicators are actually a little smaller, but not have many different hand-held transceivers to communications.
much! look at and use during the course of my hobby I don't wish to appear to be contradicting
The excellent display is brilliantly and writing for Practical Wireless. And it's on myself, but I see little point in having a radio
complimented by a very efficient green 'back my experiences of these radios that I base the that is so sensitive you can hear many stations
light'. The keys on the front of the Alinco DJ - following comments. that you have no chance of working! With this
191 are translucent, and are back lit. My home is on the outskirts of high sensitivity comes breakthrough from
One thing that has struck me about the Boumemouth, and I've always received the pagers, computers and other similar sources.
Alinco DJ -191 is the apparently 'everlasting' Bournemouth repeater GB3SC on * Editorial comment: To see whether there
battery pack. At the beginning of the review 145.625MHz as a very strong signal. This has was a problem with the review transceiver,
period I charged the battery using that been consistent with other Alinco equipment, 'Tex' Swann G1TEX checked the receiver
delightful stand in charger. (what makes you Kenwood, Icom and Yaesu alike. sensitivity and found it provided a perfectly
think I liked it?) and didn't have to recharge it To my surprise, the DJ -191 did not receive readable signal with 0.2 microvolts, (although
once. It's not a reliable test, but all I can say is GB3SC that well at all. At first I thought this a signal lower than this level could be
that I was pleasantly surprised on how well it may be due to location, but even in the loft detected). Tex reports that he considers it to
coped. conversion of my bungalow, leaning full be well within specifications.

18 Practical Wireless, December 1995

Computer Compatibility p.t.t. (but for low power
only).
The Alinco DJ -191 passed what I call my
'computer compatibility test' very well. Placed Full Marks ICA 4110
AUTO DIAL
next to my PC and monitor it hardly suffered at V DIAL M
all from noise. I found that the ability
to be able to transmit
DSO
In fact I was able to quite happily conduct
a thrilling QSO with a local amateur, Gerry on high and low power 4110
G7JEZ, while sat in my study right next to the
PC. It started when I heard Gerry call a GW
so easily on the DJ -191
(with the second p.t.t.)
411. SKIP
station. was very useful
As the pigeon flies (no crows in my area of
Bournemouth, just pigeons!) Gerry is not that
indeed...full marks to
Alinco for this little VHF Fm
TRANSCEIVER
r,
L/ J
_191
far from me. So, I thought that he could help innovation. There's no
with some audio reports. doubt that Alinco have
Gerry was kind enough to return my call, responded to a market
giving me a very good signal report. We had a need, with a simple to
very interesting chat and I explained I was use, straightforward
putting the DJ -191 through its paces. hand-held.
Gerry told me that he was not one to 'gild The transceiver has
the lily' and that if I wanted a frank critic of the modern features
what the radio was like I had come to the right such as DTMF and Unusually, the transceiver's microphone is mounted at the
man. So, I thought that it only fair to use CTCSS (full CTCSS bottom of the front panel.
Gerry's own words to describe the transmitted operation requires
audio on the DJ -191. optional equipment to
He said it was "BBC quality"! Gosh, I be fitted) but the
thought, that's pretty good ...Gerry then emphasis is definitely on old style simplicity. further than any other radio I've seen in recent
added..." Well perhaps I was a bit over the For this, Alinco must be congratulated. times.
top" (oh! sudden deflation...but hold on there's The Alinco DJ -191 will never set the world The wonderful display and large well
more..."the audio is very good indeed, 'A5 - on fire. And that, in my opinion, is its greatest labelled buttons will make it a very popular
star' quality"! strength. It has been designed for simplicity radio. As will the fact the you don't have to be
So, I took that to be a more than favourable and ease of operation. There's not a lot I can a genius to operate it. But for all its simplicity
report on the audio. My thanks to Gerry for say about this except that the transceiver is a the DJ -191 can hold its own in the techno-mad
taking the time to talk to me. robust unit that exceeds its own expectations world.
as far as the basic approach is concerned. My thanks go to Waters & Stanton
Flying Colours In saying the DJ -191 is basic I'm not Electronics of 22 Main Road, Hockley, Essex
suggesting it's 'cheap and nasty'. Quite the 555 4QS. Tel: (01702) 206835, FAX (01702)
So, the DJ -191 had passed its first 'on air' test contrary, and if fact the transceiver boasts 40 205843, for the loan of the review model,
with flying colours during working a contact memory channels and direct frequency input which sells for f249 and is available from UK
some 4 to 5km away in town surroundings via the DTMF key pad. (This is an inexpensive Alin co stockists.
using the transceiver's helical antenna and option that will appeal to those who want a PW
about 1.5W. (And the contact was maintained good quality, straight -forward product).
on the low power setting). The transceiver is well manufactured, well
Personally, I found that the Alinco DJ -191 presented and works well. The audio both on
was more easily operated in the left hand. transmit and receive are of a very high quality.
Incidentally, just below the main p.t.t. button is There seems to be a move away from the
a smaller p.t.t. button available as an option. 'all singing, all dancing' microscopic -sized
This usually sends the 1750kHz tone burst, radios seen in recent years. With the DJ -191,
however it can be changed to be a second Alinco seem to have taken this move much

Manufacturer's Summarised Specifications

General

Frequency Coverage 144-146MHzMHz

Channel spacing 5, 10, 12.5, 20, 25, 30kHz steps
Power supply requirements 4.8-13.8V d.c. (4.8V d.c. standard) The DJ -191
Current consumption TX on high power at 13.8V d.c. = 1.5A RX (squelched) is supplied
50mA (approx) with a
Operating temp -10 to +60°C 'stand in'
Dimensions 57 x 151 x 28mm type charger
Weight approx 300g (see text for
Transmitter comments).
Output power High: Approx. 5W (at 13.8V d.c.) Low: Approx. 300m
Emission mode F3E (f.m.)
Spurious Emission -60bB below carrier level
Microphone Electret condenser type
Receiver
Receiver design Dual conversion superhet (1st i.f. 21.7MHz, 2nd 450kHz)
Sensitivity 12dB SINAD <-16dBp (144- 147.995MHz)
Selectivity > ±6kHz at -6dB
< t 12kHz at -60dB
Audio output More than 200mW (at 10% THD)
Speaker impedance

Practical Wireless, December 1995 19

 Analyse Your
Antenna.... With NEW
This Month's

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ig IS
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test antenna for PW. Clive commented: "With the help This First Edition of the Top Secret 11.P.
of the MFJ antenna analyser unit I tuned the antenna International Confidential Frequency List
to the middle of the 21MHz band in a few minutes. The contains more verified h.f. spot frequencies
MFJ-259 is a delight to use. It makes tuning antennas than any other publication in its field. There
so simple, and it saved me a lot of time. Anyone who are more than 35,000 frequencies and back-
experiments with antennas really should think up chapters, including a detailed mode
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seriously about getting an antenna analyser, (from PW pages.
Page 34, November 1995).

Normally the MFJ-259 would cost you £229.95 plus P&P but Receivers for utility listening
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20 Practical Wireless, December 1995
A11 IMPORTANT ANNOUNCEMENT

NEW MANUFACTURING COMPANY

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Practical Wireless, December 1995 21

 iii
L=1 -c) ILL S -c_71 -Eh! (It - 7 -c)
Lb:17-LT
Tool kits are available in many shapes
Elaine Richards G4LFM says setting -up a and sizes.
workshop can mean lots of different things to
different people. Here she takes three examples
of a workshop set-up and details what you may
need in each.

When you start out in radio as a you are testing the right spot.
hobby, depending on your There are a lot of meters on the market.
interests you may only need a Have a look through some catalogues and
very simple tool box or you you'll see the wide range of facilities and
might want to set-up a full workshop. prices that go with it.
So, let's look at Amateur 'X'. Let's assume As for a basic tool kit, you should always
they've got licensed recently, but don't have try and avoid the cheap -to -buy and cheaply
any real interest in home construction, but just constructed ones. They won't last! If you buy
need to put on the odd antenna connection, fix good quality tools, they should last a lifetime.
a mains plug or similar tasks. What sort or
'workshop' is needed? Screwdrivers & Pliers
You'd best start with a toolbox, so you
have one place to keep everything. Now this A set of miniature screwdrivers and a couple of
can be one of those open toolboxes made of flat -bladed and cross -head screwdrivers are a I think you should also add a solder sucker
plastic with a handle in the middle. good start. I'm sure I don't need to describe or desoldering braid to the tool kit - just for
You often see 'open' type in hardware how you use them! those very rare errors.
shops at around the £5 mark. Or it could be a Just make sure they are suitably sized for A solder sucker can take a bit of getting
lidded box with a handle on the top available undoing mains plugs, equipment cases and the used to, and make sure you can get extra
for between f10-20. like. Another useful tool is a pair of long -nosed nozzles as they have a habit of melting if you
pliers, these are great for picking up the get them too close to the soldering iron!
Basic Tool Box washer that has been dropped down inside the Trouble is you have to melt the solder to
set! remove it.
So, what should you have in a basic tool box? Actually, long -nosed pliers are great for For fault finding, both freezer spray and
The most expensive pieces are going to be a holding small components for soldering, if you switch cleaner can be invaluable. If you have
soldering iron and a meter of some sort. Let's decide to have a dabble. Other than the tools got a piece of kit with an intermittent fault,
look at a soldering iron and a stand first. I've mentioned, for a basic tool kit I would just then cooling it with freezer spray (or gently
You can use just a simple 17W miniature include a pair of wire cutters, the ones often warming it with a hair drier) can make the fault
soldering iron and one of those coil stands called snip cutters are a good happy medium. appear when you are ready to search for the
with a piece of sponge in the base. This will If you buy carefully, I think you could trouble.
set you back around the £15-17 mark, unless probably build-up a basic tool kit with the Switch cleaner is used for a multitude of
you can get a bargain at a rally. items I've metioned for about £50, (if you have tasks, because sooner or later you get a nois \
But if you can, I would suggest you invest to buy everything, including the toolbox). switch or potentiometer, that's why it should
in a temperature controlled soldering station. be in the tool box.
These are more expensive starting at around Home Construction There are some things that look like cotton
f40, but are much more versatile and reliable. buds with very long sticks that you can buy for
Mind you, if you want to get into some Now onto Amateur 'Y', who's decided to have cleaning things in awkward places. These sorts
serious soldering and are looking to buy a a go at a bit of home construction. A few extra
soldering iron to last for years and years, buy bits and pieces are needed and this starts with A soldering iron like this will
carefully. You should think about buying an the better sorts of soldering irons I mentioned probably cost you around £15-17.
iron that has an adjustable temperature range earlier.
and a grounded (or 'earthed') tip. A set of 'helping hands' would also be a
useful aid when building bits and pieces. They
The Multimeter usually comprise a stand with a magnifying
glass and a couple of large crocodile clips on
The multimeter in your tool box should be a 'arms', sometimes they even have a small light
good quality unit. If you are sure you are only built-in.
going to use it for the odd voltage reading and Some anti -static protection used when
continuity testing, then don't spend too much building projects could save untold hours of
money. fault searching later. Simple earth connectors
But, if you think you might need a better are about £5 or so and you wear these around
meter in the future, think about getting one your wrist with the other end securely earthed.
with a built-in bar graph display (great when The best thing to have is an anti -static
dealing with varying signals). It's also useful if workstation. This is usually a piece of anti-
it has a hold facility so it retains the reading static bench matting, floor matting, a wrist
whilst you are concentrating on making sure strap, tweezers and an earthing cord.

22 Practical Wireless, December 1995

 11*.
1 ks\

4', 1-6 A. \.
.10
s
Elaine G4rFM multimeter in your tool box.
should be a goo ality unit" and there are plenty to
choose frojr.

KENV1000 :7
A vital item in a
1111111. -
comprehensive
workshop is the
oscilloscope.

\s'k

MEV.

.115114_
A set of 'helping hands' can be a useful aid when home -
.01. itt7
Off WIC
brewing.
(-11,1111441:011
Vital 'Scope a signal generator.
For most people the solution is to buy
Another vital item in a comprehensive commercial equipment second-hand. You will
workshop is a two -channel oscilloscope. This find lots at rallies and advertised in many
is essential when setting -up projects and is electronics magazines.
certainly a great aid to fault finding. I've bought a number of Marconi units
of bits and pieces can often be bought at If you intend to do much work with digital over the years and have always been
rallies at good prices. circuitry you should also seriously consider impressed with the constructional quality. With
So, can things like pvc insulation tape, self getting a storage 'scope to capture the very some careful searching you should be able to
amalgamating tape and heat shrink sleeving. short duration signals. When choosing your pick-up a quality h.f. or v.h.f. signal generator
They're all useful for the home constructor. 'scope you should consider one with a 20MHz for between f100 and £200. (Of course you
bandwidth as the bare minimum. can pay much more if you have the budget).
Test Equipment You will also need a signal source so you
can align your new projects. The type of signal Bench Power
Now, what if you are Amateur 'Z'. If you're source depends on the type of project you will
getting seriously into home construction then be building. Finally, you ought to have a good quality
you will need all the tools I've described so far If you were to specialise in audio work you bench power supply. Ideally this should have
plus a good range of test equipment. A good would need a low distortion audio signal two separately adjustable supplies with at least
multimeter is worth its weight in gold but, in generator. Ideally it should have a frequency 30V at 1A available.
addition to the basic a.c. and d.c. ranges there range from around 10Hz through to 100kHz. To protect your new project from instant
are a few extras that can prove very useful. destruction, its worth paying a bit extra for a
Take a very close look at the specification Signal Generators supply with variable current limiting. If you
of the a.c. range, ideally you want a response want to save some cash you could build your
to at least 20kHz and preferably up to a few For digital/logic work a function generator is own power supply, as there are plenty of
MHz. You will find many of the cheaper units essential. This should have as wide a range of published designs around.
cut off above 200Hz. features as you can afford. So that's it, a quick look at what the three
It's also worth considering one of the The real expense comes when you move different workshops offer. Really it all boils
multi -function meters that includes into signal generators for radio frequencies. down to what you want to do with your
capacitance measurement. This can be a great Not only do you need a very stable frequency hobby -time and how much you have available
help when dealing with components that have source, but the generator must exhibit low to spend. With careful shopping you should
lost their markings. noise and feature an accurate attenuator. get years of service from some good
Whether you're dealing with logic, audio Although there are cheap modern signal equipment.
or radio, a good frequency counter is a must. generators on the market, many suffer poor
It's advisable to select a model that can be stability and leaky attenuators. It's extremely PW
configured as a timer as well as counter. difficult to align a sensitive receiver with such

Practical Wireless, December 1995 23

/CZ
Based on the original PW Robin
frequency counter but with added
functionality, this is Ken Ruiz's
version.
Ken Ruiz G4SGF/ZB2MD second update is fast enough to track tuning There are few problems when the it, is to
the v.f.o. on my transceiver to look like an be added to the local oscillator frequency (i.e.
shows you how to get faster instantaneous display. the Lo is below the received signal), but what
Using the original circuit PW Robin as a if the I.o. is above the received signal. Now we
display updates and a digital frequency read-out is fine while the need to subtract the i.f.
frequency offset reading on the radio in question is a direct conversion
PW Robin counter. receiver. If the receiver is a superhet receiver Subtraction Cheating
or a transmitter is used, problems may arise. In
these circumstances just reading the frequency Well, subtraction can still be done with the
of the local oscillator will give the frequency of circuitry described here, as long as we don't
The modifications I'm describing are to operation offset by the i.f. mind cheating a little! Let me give the example
the Robin Frequency Counter (PW as I solved it for my transceiver (the G2DXK rig
July -August '91), which while Offset Frequency published in RadCom June -October '84).
preserving its original specification The G2DXK rig uses an i.f. of 4.432MHz
also permits more frequent display updates. It's a relatively simple modification to permit using cheap TV crystals. The I.o. for the
I've also suggested a way of getting a the counter to be used as an offset frequency 14MHz band runs from 9.567 to 10.167MHz.
frequency offset, so as to use it for displaying read-out. All that's needed is add to (or So I need to add 4.432(MHz) This operation
the received frequency when reading the local subtract) the i.f. to (from) the local oscillator only needs simple addition.
oscillator of a superhet receiver. frequency. This is easily achieved using eight On the 7MHz band, the I.o. covers 11.432
Please refer to the original PW Robin 4560B b.c.d. adder integrated circuits to 11.932MHz. On this band I need to subtract
article. In order to update the display more The 456013 adder i.c.s has two sets of input 4.432(MHz) to give 7.000 to 7.500 on the
often, the gating frequency (input to pin 5, IC3) lines and one set of output lines. The b.c.d. display.
must be increased. The easiest way to achieve number appearing at the outputs is the sum of Now, instead of subtracting
this is by changing the timing crystal to the numbers appearing as the inputs. The i.c. 4.432000(MHz), I add 95.568000(MHz)
3.2768MHz and then taking the output from also has 'carry in' and 'carry out' facilities. instead. The effect is for the 4560 i.c.s to add
pin 7 instead of pin 12 of IC2. (The frequency Carry out means that the sum of the input 95.568000 and 11.432000 to give
at this pin is 50Hz). numbers plus the carry in 11 or 01 was more 107.000000.
The 50Hz frequency is then divided by 10 than 9 in total. Carry in means add one more The leading '1' is not displayed as it 'falls'
(5Hz) or by 100 (0.5Hz) to give display to this count. It might help to think back to the off the left hand end of the display. All I see is
updates of five times per second or once every 'carry one' tick on the simple sums we all 07.000000MHz. See Table 1 for the binary
two seconds as originally. The resolutions started out on at school! values of the offsets I used.
respectively are on h.f. 1 or 10Hz, or on v.h.f. In the Robin, the connections between the Fine, so now we can add or 'subtract' the
they are 10 and 100Hz. counters (i.c.s. 7-10) and the display drivers i.f. but what if we need to do both and quickly,
The output from pin 7 IC2 is fed to an extra (i.c.s. 11-18) are broken. The outputs of the as on changing bands? The answer comes in
IC (IC20), a 74HC390 in a symmetrical divide counters are taken to the 'A' inputs of the eight an extra switch on the front panel.
by ten (biquinary) mode. Using one stage gives 4560Bs. The value of the i.f. is programmed Looking at the BCD equivalents on 4.432
an output of 5Hz, two stages 0.5Hz, as shown into the 'B' inputs and the sum of these two is and 95.567 as required over the eight digits of
in Fig. 1. Assembly of this small circuit can be presented to the display drivers, see Fig. 3. the display you will see that some lines are
on stripboard or you could add it to the p.c.b. The connections between (original) i.c.s 7- permanently on logic level '0' and some are
as I did when creating my own board. 10 to IC11-18 are all by wires on the top of the permanently on logic '1'.
board. Because of this the modification can be Others are at logic 1 for 4.432 offset to
The Modification carried out on an existing Robin without become 0 for 95.567 offset, and vice versa.
removing it from its case or modifying the The problem is solved using a 3p -3w switch,
If you attempt the modification on first board (assuming the case is large enough to as in Fig. 4.
assembly, it's a good idea to modify the accommodate the extra circuitry). The 'B' inputs to the adder i.c.s that are
decimal point display at the same time. The As there are few interconnections between permanently at logic '0' are permanently
method used is similar to the original circuit the new adder i.c.s, it doesn't seem grounded. Those that are to be permanently
when using the higher gating frequency to worthwhile to create a p.c.b. You could make logic 1 are connected to Sic wiper. Those
count for 0.1sec. up your own layout using perforated board which are to be logic '1' for 4.432 (and 0 for
Moving the decimal point to the right one instead. 95.567) are connected to (new) SI a wiper, and
place gives a 'correct number of MHz' display.
Shown in Fig. 2 is the arrangement I used with
a four-way switch. The switch assembly only
replaces Slb in the original circuit - a separate
switch is needed for Sl a (original circuit), the
power switch.
You may think that taking the 50Hz signal
as the gating frequency would update the
display 50 times per second with a 100Hz
resolution on h.f. and lkHz resolution on v.h.f.
This state of affairs doesn't work because the
latch and reset pulses are too long.
You might make it work by redwing R26
and R27 (in Fig. 1.2, p27 PW July '91) to about
100k, but these shorter pulses may not be long On the back panel is a patch panel to allow any offset to be quickly
enough to perform their original functions. I programmed into the adder inputs.
haven't tried this because the five times per

24 Practical Wireless, December 1995

 Table 2
Dee C A
S 4 2
.5V
II 17 9 15 0 0 0 0 0
To pin 5. IC3 0 0 0
From 4
and pin 5, IC4
pin 7 IC2 %IC20 j13 2 0 0 1 0
1On 3 0 0
2.1 14
4 0 0 0
5 0 1 0
6 0 0
7 0
8 0 0 0
Fig. 1: An additional counter has to
9 0 0
be added if you follow Ken Ruiz's
mod for faster updated display. The Table 2: The binary
i.c. has been given the number representations of the
IC20 to distinguish it from the decimal numbers 0-9 to
original Robin circuitry. The single be used when setting
switch allows normal or f/10 your own i.f. offset.
resolution for a faster update. This Check these with the
circuit does not alter the decimal values shown in Table 1.
point I.e.d.

To Dospay 3. pen 9
To Display 3 piti4 and Display 1, pin 4 in Display 4. pin 9
The offset p.c.b. is mounted above Pin 3IC20
and Display 2, on 9 and Display 2. pin 4

the original PW Robin board, and is Pm 13. IC20

connected to it by the mass of wires. IT 150 180 180

Perhaps not so pretty, but, it is very

To board
useful! -1,117 via Sib"
Pin 5. IC3
and pin 5, IC4 to board
'RI via SIb'
those which are for '0' for 4.432 and '1' for
95.567 to (new) Slb.
The upshot of this is that when (new) Si is
moved to the far left, all the 'B' inputs are at From board
logic '0', and the output of the adders i.c.s is 441'5V Sib *Mee
exactly that which appears on the 'A' inputs. In
other words the Robin display is unmodified. Fig. 2: A new range and resolution switch. Made by combining the simple
On moving to the central position, the 'B' switch of Fig. 1 and the function of the original Robin range switch.
inputs see 04.432.000 and the i.f. is added to
the I.o. signal. At the far right, the 'B' inputs
see 95.567.000 and the i.f. is 'subtracted' from IC10 IC57
the I.o. signal. (The extra work needed to the inputs 13. Opal 8' inputs
0112 6 4
transceiver is a socket on the back panel, an
output for the I.o.). .V
On my Robin, I took all the 'B' inputs to 8 4214 5 3115 6 214 3 IS 64 14 53
I I

15

the back panel and by means of jumper wires I 16 16

(n.c.)
can hard -wire program any offset that I 45608 7 4580B 7 45608 7

require. For each 'B' input line I have four 10 12

value 'buss' lines I can connect them to. I have qtl p0 11 13

lines labelled, 1, 1-0, 0-1 and 0. 111 1

The four buss lines are: permanent 'I', '1' a2 a a.
CI I IC11
C18
going to '0', '0' going to '1' and permanent '0' Least but one Least significant
respectively. These are the four different input MOSIS1gnAlcant digit
significant digit digit

to the various 'B' input that are required to Repealed 1040 lanes. J
for each of c s IC7 -10
give offset readings above (or below), when
changing the readings to above or below the
count.
Fig. 3: The skeleton circuit of the adder circuit to give a
I think you will agree, this makes an frequency offset. The right hand pair must be duplicated
already excellent counter even better. So get for each of the counter i.c.s in the original PW Robin.
busy and get 'modding' your Robin.
PW
Fig. 4: The new count control
The original PW Robin article (by Mike switch. As shown, it is in the
Rowe G8JVE) was in the July and August direct counting position. In the
1991 issues of PW. Errors & Updates middle is 'offset -1', and to the Sia Sib Sic

appeared in September and October of that right is the position for 'offset -2'.
year.
In the September 1993 issue of PW Mike
Hughes showed us how to lower the power Table 1
Table 1: The binary representations
requirements of the counter. 0 4 4 3 2 0
of the two example numbers to be
Over a year later (October '94) Mike 0000 0100 0100 0011 0010 0000 0000 'added' to the count. See text for
Rowe put a thermal oven into the PW 9 5 5 6 7 0
more detail.
Robin. In the same month George Fidler 1001 0101 0101 0110 0111 0000 0000
G3TDV extended the Robin to count time
and capacitance.

Practical Wireless, December 1995 25

 ---M1=111M
rl lid- nib [( I 1 "0 C IC I 'I?'
"I

I( o II ,6; Fr/ F;
Rob Mannion G3XFD tries out
the latest release from the
Kenwood stables and wonders
if it's the 'ultimate' in amateur
radio transceivers.

During the first week of October I was

over in Cork operating as EVG3XFD.
Not on PW business, but on holiday
as the guest of my old friend John
Tait EI7BA.
I had an excellent holiday and wonderful
hosts. The Tait family even threw me a
birthday party complete with cake of which (of
course) I ate too much. Eunice Tait, John's
wife, is a super cook and I couldn't resist the
delightful chocolate cream sponge cake!
Along with delightful scenery, good But before I wax lyrical, let's take a brief Surely, following Kenwood's convention,
weather (apart from the day before and the look at the circuitry and specifications. There any stage where there's conversion and
actual day of sailing home from Rosslare!) I are some interesting points and one in subsequent signal handling involved, could be
had another marvellous surprise - in the shape particular where I take Kenwood to task. More referred to as an i.f.? And as an example
of a brand new Kenwood TS -870S transceiver. of that later! (suggested by several amateurs whose opinions
And to top everything off, Kenwood air - were asked) the product detector came to
freighted it over to me...l felt privileged indeed. Circuitry And Design mind. After all, a product detector is a 'mixer'
Of course I'd heard a lot about the TS -870S followed by signal handling (albeit at audio
and the digital signal processing facilities, but The circuitry and design on the TS -870S is very frequencies) stages isn't it?
little realised that the rig (described by one interesting and (incredibly) complex. However, However, I've said my piece and I don't
USA station as the 'ultimate') would arrive (apart from the many extras) the concept want my opinion to detract from the amazing
when it did. And, following my 'on air' tests at behind the transmitter side is that of an all performance provided by the transceiver itself.
E17BA's home (complete with formidable amateur bands unit covering from 1.8 to So, lets take a look at what you get for your
antenna 'farm') I too was left wondering about 30MHz, providing a.m., c.w., s.s.b., f.s.k., and money!
this amazing machine. f.m. modes. with an automatic antenna tuning
unit (a.a.t.u.) built-in. Digital DXing
The Ultimate? As is usual nowadays with the Japanese
manufacturers, the receiver side provides My first reaction to 'Digital DXing' with the
Anyone who claims that they've discovered general coverage, along with the amateur transceiver was one of great surprise. The TS -
the 'ultimate' (whether it be recipe, car, or bands. So, in effect the operator of a TS -870S 8705 seemed so quiet it appeared to be 'deaf'.
'dream' house) takes the risk of compromising has a versatile package to hand, covering But it's far from being deaf!
themselves and their opinion...when the next 30kHz (the receiver tunes far below what the On the TS -870S if the signal is out of the
'ultimate' comes along. However, after trying specifications state) to 30MHz. digital signal processing (d.s.p.) 'passband' (if
this transceiver I wonder how long it will be On the receiver side, basically speaking, you can still use that term)...it's simply ignored.
before Kenwood can better it, because it's truly Kenwood describe it as being a "Quadruple You don't hear the noise or the 'off channel'
amazing. conversion" on a.m., c.w., s.s.b and f.s.k. (f.m. signal. The result is an amazingly quiet
No review, gathered from only a few weeks reception is provided by the receiver working receiver which you have got to hear to believe.
trying a transceiver such as the TS -870S, can in a dual -conversion configuration). And the So, once I'd got used to the fact the
truly reflect its capabilities and features. 'fourth' conversion is the point where I beg to receiver was working, I suddenly realised that I
However, I can only try and convey the sense differ with Kenwood! (see below). could hear stations that would normally be
of wonderment gained from using the rig and The first i.f. is very high frequency at totally buried under the noise. This fact was
I'm too aware that to provide a true 73.05MHz, the second is at 8.83MHz, the most noticeable on 3.5MHz s.s.b. during the
representation of what the TS -870S can do, I'd third at 455kHz and the fourth is at 11.3kHz! evening.
need six months with the transceiver and at The 'fourth' i.f., as I've mentioned, is where Both John EI7BA and I (using his excellent
least two issues of PW1 I disagree with Kenwood's interpretation on an range of antennas and marvellous location for
So, what's it all about, just what is so 'intermediate frequency'. I concede that the h.f.) were able to work into the USA, South
special about the TS -870S? Well, in effect, it's 11.3kHz (where the digital signal processing America and beyond with incredible ease and
a feature -packed state-of-the-art 100W takes place) is in effect a 'conversion' (it has to complete QSOs under the most difficult
transceiver with a truly 'magic' ingredient be, because of the analogue -to -digital (a -to -d) conditions.
added...in the form of the digital signal conversion process, but I dispute that it should And in fact, John actually worked an
processing. The effect of this has to be heard to be referred to as an 'i.f.' in the conventional American amateur who was using a TS -870S
be believed. sense as we know it in radio communications. himself. It was this station who passed on the

26 Practical Wireless, December 1995

 Manufacturer's Specifications
General
Modes: 13E (s.s.b.), Al A (c.w.), A3E (a.m.), F3E (f.m.),
Fl D (f.s.k.)
Antenna impedance: 500 (with antenna tuner 20 to 150Q)
Supply voltage: 13.8V d.c. (negative ground)
Current consumption
Transmit: 22.5A (maximum)
Receive: 2A (no signal)
Usable temperature range: -10° to 50°C
Frequency stability: Within *1 Op.p.m. (between -10° and 50°C)
Frequency stability
(at room temperature): Within t10p.p.m.
Dimensions: 339x135x375mm (projections included)
Weight: Approx 10.8kg

Transmitter
Frequency range: All amateur bands between 1.8 and 29.7MHz
Output power: s.s.b./c.w./f.s.k./f.m. 100W (max) 20W (min)
a.m. 25W (max) 20W (min)
Modulation: s.s.b. (balanced)
The inter -unit connections f.m. (reactance)
a.m. (low level)
Spurious emissions: -60dB or less
Carrier suppression 50dB or more
information that they'd been told the Kenwood Unwanted sideband
designers has specifically developed the TS - suppression (modulation
870S for European 3.5, 7 and 14MHz freq. I kHz) 50dB or more
conditions! And although I'm unlikely ever to Maximum deviation (f.m.): t5kHz or less (wide), *2.5kHz or less (narrow)
meet the anonymous designers, if I ever do, I'd Transmit freq. characteristics (-6dB) (TX bandshift 300Hz,
like to tell them they've done a good job. TX bandwidth 2.3kHz) 300-2.6kHz
Trans. shift (XIT) range: ±9.99kHz
Signal Processing Microphone impedance 60012

The signal processing features on the TS -8705 Receiver

have to be the major point for anyone Circuit type Quadruple' conversion superhet
contemplating buying the transceiver. So, it's
only fair to look at these in as much detail as ('see review for comments)
possible in the space I've got. Double conversion superhet (f.m.)
The TS -870S (the '5' designates it as the Frequency range: 100kHz to 30MHz
high power version of the transmitter, the low (* see review for comments)
power version being available in Japan) design Intermediate frequencies: (1st) 73.05MHz, (2nd) 8.83MHz, (3rd) 455kHz
incorporates a two -channel Sigma -delta A -to - (4th') 11.3kHz
D converter, two two -channel Sigma -delta D - (* see review for comments)
to -A converters and a single -bit Sigma -delta Sensitivity
converter. Operating at a clock rate of 40MHz, (s.s.b./c.w./f.s.k.) at 10dB (S+N)/N) 100kHz to 500kHz 1 pV or less
the d.s.p. works on all modes. The adaptive 500kHz to 1.62MHz 4pV or less
filter functions include Auto Notch, Line 1.62 to 24.5MHz 0.2pV or less
Enhance, and Beat Cancel. 24.5 to 30MHz 0.13pV or less
Kenwood claim (and my experience with (a.m.) at 10dB (S+N)/N) 100kHz to 500kHz 2pV or less
the transceiver more than bears this out!) that 500kHz to 1.62MHz 31.6pV or less
d.s.p. is the most effective way of using current 1.62 to 24.5MHz 2pV or less
technology to separate what you want from 24.5 to 30MHz 2pV or less
what you don't want to hear. While receiving, (f.m.) at 12dB SINAD 28 to 30MHz 0.25pV or less
you hear the most signal and the least noise Selectivity
(you have to experience it on 3.5MHz during s.s..b. (Low 300Hz) High 2.6kHz) -6dB: 2.3KHz, -60dB: 3.3kHz
the evening to fully appreciate the results). c.w. (width 200Hz) -6dB: 200Hz, -60dBB: 450Hz
The desgners also claim, that while f.s.k. (width 500Hz) -6dB: 500Hz, -60dB: 1000Hz
transmitting, transmissions from the TS -870S f.m. (width 14kHz) -6dB: 14kHz, -60dB: 18kHz
only emit the desired audio components of the Image rejection (1.8 to 30MHz) 80dB or less
modulation without adding distortion. This is First i.f. rejection (1.8 to 30MHz) 80dB or less
achieved by the incorporated 'transmit Notch filter attenuation 40dB or less
equaliser' combining high boost, bass boost Receive incremental tune range: ±9.99kHz
and comb filter functions to further improve Squelch sensitivity
the signal. (s.s.b., c.w., f.s.k., a.m.) 100 to 500kHz 2pV or less
On receive, with d.s.p. the operator can 500kHz to 1.62MHz 20pV or less
hear signals that are covered by noise on non 1.62 to 30MHz 2pV or less
d.s.p. fitted equipment. The enhancement is f.m. 28 to 30MHz 0.25pV or less
provided by the reduction of atmospheric and Audio output 1.5W (into 8Q at 10% distortion)
'white' noise and to the rejection of adjacent Audio output impedance 8L2
frequency interference, including heterodynes.

Practical Wireless, December 1995 27

 well it copes with the effects of nearby
lightning and static 'crashes'.
During one storm in Cork when operating
from EI7BA's QTH, I realised that the 'fizzing
noise' (with only a slight reduction in signal
strength!) was caused by a heavy static
discharge from the antenna while it was
connected to the rig! There was no damage
and contact was maintained throughout the
storm with the digital a.g.c. action coping
extremely well.
So, in rounding off the review I can say I
was immensely impressed with what the TS -
8705 has on offer for a 'main station'. It's an
operator's delight, with the facilities including
the amazing continuously variable a.g.c., and
awe-inspiring d.s.p. likely to help anyone.
Finally, is TV line and field timebase
interference a problem at your QTH? You can
forget it with the TS -8705! And bearing in
mind that we suffer more interference than we
cause in the course of our hobby...that's got to
be good news.
Reluctantly, I returned the transceiver to
Kenwood for display on their stand at the
Leicester show. But I'm looking forward to
using it again in 1996, with our new 'On
Reflection' feature, where reviewers will 'look
back and reflect' on their original comments
Internal view of the TS -87011 transceiver.
and findings in reviews on major items, with
the benefit of hindsight and getting another
chance to use the equipment (see 'Endnotes' in
this issue).
The 'cleaning -up' capability of d.s.p. has a possible for me to work many weak stations on My thanks go to Trio-Kenwood (UK) Ltd.,
significant effect (as I've mentioned). The overcrowded bands. Another benefit was that Kenwood House, Dwight Road, Watford,
signal you're trying to receive seems stronger the lack of noise and interfering signals also Hertfordshire WD1 8E8, for the loan of the
and clearer even though the S -meter reads the meant I could spend longer on the air without TS -870S which is available from Kenwood
same strength! fatigue (a very important point). approved dealers for £2399.95.
In the manual Kenwood say that some may PW
think a little 'magic' is being used...and I agree On The Air
with this statement! With the usual difficult
conditions on 3.5 and 7MHz I was copying Of course, I used the TS -870S on the air from
stations I know would have been either very EI7BA's QTH and also my own more modest
difficult or impossible to copy without the systems (long wire, 7MHz horizontal loop, and
d.s.p. trapped -dipole). The results were impressive.
Incidentally, although I've only briefly The reports on my audio were consistently
mentioned the manual (I only had the 'pre- good and many friends said they had no
production 'model') it was good. Mind you, problems in recognising my voice. However, I Top view, showing loudspeaker and
with equipment as complex as the TS -870S, found that the slightly 'switchyness' (a sort of modularised circuitry.
the manual has to be good. 'clipped' effect) of
However, (bearing in mind I'm not the final audio was
'computer friendly') I soon found myself quite rather odd. This must
at home using the manual in selecting of course, be due to
parameters on the keyer to suit myself. That's the 'reconstructed'
got to be a compliment to Kenwood! audio after the final
digital -to -analogue
Morse Mode conversion. But, after
a very short while
Working the Morse mode on the TS -870S is my ears became
where the transceiver truly sold itself to me. used to the sound
The performance, facilities and ease of and I found I was
handling defy superlatives. perfectly at home
The built-in K1 'Logikeyer' (Kenwood even with the rig.
supplied a paddle key on loan with the rig for Although I only
my benefit during the review!) was used the TS -870S on
programmable for speed, weighting, messages s.s.b. and c.w., I've
(yes it's got that too!) and a great number of no doubt it will be
facilities I did not have time to use. Even keen excellent on the
contesters have been thought of as the other modes. But in
designers have incorporated an auto - rounding off this all -
incrementing serial number system for contest too -brief summary
QS0s. on the transceiver, I
The selectivity and d.s.p. facilities made it must mention how

Practical Wireless, December 1995 28

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Practical Wireless, December 1995 29

LC C.L_L: -LAW? 7 -ILL? LiiC I2 LLl 711
2 CC L1212 LL-C:Il
Mike Rowe G8JVE, the any external antenna. Despite this, I've is attenuated by R43, R44 with shaping of the
included an external antenna socket which is waveform by C28.
designer of the popular PW fitted for difficult locations. The other input of the p.I.I. is fed with
'Robin' frequency counter, 2kHz derived from the crystal oscillator. The
describes an interesting Droitwich Received 10MHz (from which the output is obtained) is
generated by a Colpitts oscillator which is
frequency standard to improve Look at the block diagram of Fig. 1 and the roughly tuned to frequency by C21.
accuracy on the instrument, circuit diagram in Fig. 2. Signals from Fine tuning of the 10MHz oscillator is by
Droitwich are received on an internal ferrite the varicap diode D2/3. This is controlled from
courtesy of BBC Radio 4! rod antenna. Alternatively they can be coupled the output of the p.I.I. via the network
in from an external antenna and amplified by R37/C30 to R42/C31 and diodes D6/7. Resistor
Tr1 before passing to the double balanced R41 is made up of four 10Mi2 resistors.
mixer IC1 at 198kHz. Output level from the crystal oscillator is
Oscillator injection is 200kHz (more about raised by Tr3 raises the output to t.t.l. levels.
The frequency standard I'm describing this later) and the resultant 2kHz i.f. is derived The 10MHz signal is shaped by IC3 providing
was developed as a logical extension across the tuned circuit L2/C10,C12. The 2kHz a square wave output drive to the divider IC7
to the popular PW 'Robin' frequency is amplified by IC2a (part of a quad op -amp) (providing 1MHz output), and to the divider
counter. It provides an output of either and fed to a tuned filter configured around chain IC5, IC4.
10 or 1MHz which can be divided by an add- IC2b and c. The i.c., IC4 is a dual counter arranged to
on circuit down to drive the gating circuit of The tuning of the i.f. stage is fairly critical divide by 50. This gives an output of 200kHz
the Robin. and to this end a multi -turn potentiometer for mixer injection to the other input of the
The output is phase -locked to the famous (R19) is used. At this point the output of the mixer chip IC1.
Droitwich transmitter (just south of filter splits, one path is rectified and is used to Another dual counter, IC5, this time
Birmingham and very visible from the M5!) drive a tuning meter. dividing by 100, feeds 2kHz to the second
and its 198kHz BBC Radio 4 transmissions. The other output goes to IC2d which is input of the p.I.I. This 2kHz input is compared
The advantage of this over the crystal oscillator configured as a very high gain amplifier whose with the i.f. derived signal and the resultant
in the Robin, is one of frequency stability. output is heavily clipped. This clipping output of the comparator is filtered by R42,
The crystal in the Robin has a frequency effectively removes the amplitude modulation C31 before passing to the network around
stability of approximately 20 parts per million of the original Radio 4 signals. R37, C30. It has a very long time constant
(p.p.m.), whereas Droitwich has an accuracy The amplitude of the waveform is (narrow bandwidth) which removes any short
of many times better than this. How this is approximately 8V peak -to -peak and is fed to term variations due to interference, fading, etc.
achieved is described later in the article. one input of the CD4046 (IC6) phase -locked Diodes D6, D7 conduct when the output of
The unit has achieved good results at my loop. Because the rail voltage of the phase the p.I.I. is very high or low, speeding up the
location in West Sussex without the need for locked loop (p.1.1.) is 5V, the output from IC2d locking of the p.I.I. When the circuit is 'in

Fig. 1: Block diagram of the Droitwich 198kHz

frequency standard modification to G8JVE's
PW 'Robin' frequency counter.

198kHz 2kHz 2kHz 2kHz

198kHz RF Mixer Buffer Filter Limiting

amplifier
I amplifier and filter amplifier (2kHz)

200kHz Y 2kHz
10MHz
2kHz
Variable
crystal Buffer Divide Divide Phase Lock
oscillator amplifier by 50 by 100 Loop

200kHz

To lock
) 10MHz detect
Divide I.e.d.
by 10 s 1MHz

Control voltage

30 Practical Wireless, December 1995

 IC2 = LM324 12V

R2 R5 R14
IC3 1k 1k2 R12 R13 47 R15
3k3 10k 4k7 DI
IC2 R21
Pin 4 \Mr 1
C14 22k I1I
R1 put 1N41448
1c4 R3 1C7 10
1c11 1717
1k R10 L2 it
T4 n7
R6 k 150m R17 22n
820 3 2 6 15 it
R20 R24
7051 ITIII 100k
-II -WV-. -WV-
TP1 C6 TP2 C13 C15 22k 47k
/77 Tr1 12
To external 2N3819 ICI
antenna II R7 LM1496 F\V.....A Far_.21
Li 10k 22k 1 10k
SKI 4n7 SErs 0p1 IC2a 22n
CI C2 16 14
R27
R9 100k
20p 60p C5 1k ClOmm .C12
0 51
see text R8 IC2
C8 -C9 Pin 11 R19 R23 £16
051
I
17051 390T T353 I
2k 4k7

T457
Pin 10 (IC1)
C25 5V
MI
L18 C26 F14,_
120
R4
10n 10k 0
T°' 120 250p A
T407 o C29
74LS132 74HC390 C04046
IC3 14 74HC390
IC4 ,5 I IC5 16 IC6 5
R30 R32 T102
11
39k 2k2 Tr4
C20 C24 6 12 15

,XL BC239
3 9 4 4 R38

D2 47p t 0MHz 9 2k2 R43

iv Tr2 EE 27k DC in
BB204 BC239 8 3 C27 0
051 +-18V
13
C22 3
D3n. 60p
Ob21 220p T
138204A R29 R31 14 8 2 14
270k 39k 2k2 C28
R28 C23 R44
270k 22k

T'"' 1R33 7150P '4

1N4001
1C19 C31i
ImmC30 Opt
FS1
12V
15 R41 R4
"7°P' T1
10k
'4
1 N4001
5V
11 1-711 R37 IC7 3 IC8 3
100k 5V 4-4-1 7805 I 7812
1MHz 12 IC9 1 N4148
74LS90 2 10410
D7 + 1N4001
mInC32 1033 C34
21 I 1
31617110 1N4148
trOp TOtt 47057 OE
R41 see text

71, 77 771 n 7 --?,T)U-t---1:3 70-.--:)-7-1-17

1 1 fl -11,_713
TrIc.1 7T:177-1 _777 t7-7
lock' these diodes have little effect on the
operation of the oscillator.
+5V
The capacitor, C30 must be a polyester or
similar type type. (An electrolytic is most
definitely not suitable due to leakage).

On Frequency
Only when the 10MHz oscillator is exactly on
frequency will the injection be 200kHz and 1MHz in
the i.f. 2kHz to lock to the 2kHz derived from
the divider chain.
Should the 10MHz drift for example (let's
say 2kHz) the i.f. would be 40Hz off frequency
ICs 1 - 3 are 74HC390
and the input to the p.I.I. 0.4Hz off frequency. IC4 is a 4013 CMOS type
In this case the p.1.1. will obviously be 'out of
lock'. The output of the p.1.1. would go either
high or low (depending which way the
oscillator had drifted) and the resultant d.c. Fig. 3: The divide -by -2000 000 (two million)
voltage applied to the varicap would pull the chain (see text.
circuit back on frequency.
Power supplies for the unit are from an on-
board mains unit with regulators for 12 and
5V. The split supply for the amplifiers IC2 is by pillars and Nylon 'P' clips. (The output and R27 for maximum reading on the tuning meter.
the potential divider R15/R23 which provides external antenna sockets are also mounted on This is fairly critical and should be carefully
'an artificial' mid -point ground. this panel). adjusted.
The Lock indication I.e.d.s (D4 and 5) are Switch off and refit IC1, switch on and
The Construction mounted on the small p.c.b. They're secured adjust C2 and the position of the coil on the
on the front panel together with the tuning ferrite rod for maximum on the meter. This can
Let's now look at the construction side. It's meter and power switch. also be checked with an oscilloscope on TP1.
quite straightforward as the project is built on a Finally, double check all component By now the Lock (D5, green) I.e.d. should
single double -sided printed circuit board positioning and the tracking side for any dry be illuminated possibly the red one (D4) will
(please see Editorial panel at end of text). joints or track bridging. With an multimeter be flickering, if so, carefully adjust C21. This is
The p.c.b. should be carefully examined for check both the 5 and 12V lines for shorts to best done by 'rocking' the control until a mid
solder bridges, etc., before starting. Any errors earth and to each other, as either could be point is found when only the lock I.e.d. is on.
at this stage may be difficult to detect once disastrous. Final slight adjustment of R19 and C2 for
building has commenced. maximum meter reading will ensure that the
I suggest that the i.c.s (with the exception The Alignment unit is fully aligned. Check by switching off
of the voltage regulators) are mounted in and on again the red Unlock light should
sockets. These are fitted first to provide a guide To start the alignment, with the unit powered briefly glow and then extinguish, changing
to the location of the other components. either from the a.c. mains or external d.c., over to the green Lock I.e.d.
Now fit the links shown on the layout (five check the validity of the 5 and 12V lines. Next, set the meter deflection using R27 so
in number) followed by all the resistors and Using your existing Robin, set the 10MHz that a strong 198kHz signal gives
diodes. (taking care with the polarisation of the oscillator on frequency using C21. approximately 80% f.s.d. Now the unit will
diodes). Now switch off and remove ICI and then ready for use.
Note that many of the resistors are soldered connect a 2kHz signal to TP2, set the meter Existing counters may be set up using the
to both the ground plane and the underside potentiometer R19 to about 50% and adjust 10MHz output, trimming the clock until the
tracking to provide ground returns to some
circuit elements. Also remember the square
pads (which have no components fitted) will
also need to have a wire soldered to both sides
to provide earth returns for some of the i.c.
1MHz in +5V in
pins. Robin interface Inew)
Next fit all the capacitors and trimmers.
Avoid overheating the film trimmers as this will our
cause damage.
Capacitors C9, C11 and C29 have their
5
'earthy' legs bent at right angles close to the 12 1C3
IC2
body. They are then soldered to the ground
plane. They do not have a hole through to the Pin 5 IC 4
other side the board. Original PW Robin circuit
Now fit all the remaining components and
Vero pins for the various off -board connections
and test points. The voltage regulators are
mounted 'back-to-back' and share a common
heatsink. It's probably best to screw these onto
the heatsink before soldering them into
position.
Fig. 4: Switching required between original PW Robin circuit and
The mounting holes in the p.c.b. are in
new (add-on) frequency standard unit (see text.
alignment with the fixing pillars on the
recommended case. The ferrite antenna is
mounted on the rear panel with stand-off

Practical Wireless, December 1995 32

display reads correctly. Alternatively, many
counters and synthesised signal generators
may be operated from the IMHz output
feeding this into the external standard input.

Robin Interface
Shopping List
Resistors
Carbon film 0.25W
470 1 R14
lo enable the Droitwich standard to be used
1000 1 R11
with the PW 'Robin' it's necessary to build a
1200 2 R39, 40
small interface board. The 'Robin' clock is
82052 1 R6
designed around a 4.194304MHz crystal
1k.L1 8 R2, 3, 4, 7, 8, 9, 10, 35
which is binary divided to give 0.5Hz output.
1.242 1 R5
The Droitwich standard gives either 10 or
2.242 4 R5, 32, 33, 38
1MHz output, so obviously, this cannot
3.31(0 1 R12
directly replace the internal crystal. The
4.7kSI 2 R15, 23
'Robin' interface board divides the 1MHz
1042 4 R13, 16, 22, 36
signal by 2,000,000 to give an output of
2242 5 R18, 20, 21, 22, 44
0.5Hz. The circuit is shown in Fig. 3.
271(11 1 R43
The 1MHz input signal passes to the first of
39kil 2 R30, 31
three identical divide -by -100 i.c.s (74HC390)
47W 2 R24, 34
and then to a 4013 connected as a divide -by -
10042 4 RI, 17, 26, 33
2. This 0.5Hz signal is used to drive the gate
27042 2 R28, 29
and control circuitry in the 'Robin'.
10Mil 4 R41a, 41b, 41c,4Id
Preset Multi -turn vertical
Using The Standard 242 1 R19
Miniature skeleton horizontal
The 'Robin' can easily be modified to operate lookfl 1 R27
using the external standard. This can be either
done on a permanent basis cutting out the Capacitors
internal clock completely, or may be switched
Ceramic
in as required, as shown in Fig. 4.
47pf 1 C20
Having constructed the interface board,
100pf 1 C23
this may be mounted on the rear panel of the
120pf 1 Cl
case using 'stand-offs', together with a suitable
150pf 1 C28
1MHz input socket and miniature single pole
220pf 1 C22
double throw (s.p.d.t.) switch.
10n 1 C24
Refer back to the original circuit of the PW
Polyester
Robin (PW Jul/Aug '91). Cut the track running
3.3nF 1 C12
from pin 12 of IC2 (4040) to pin 5 of IC3
4.7nF 2 C6, 18
(4538) and pin 5 of IC4 (74AC00). Connect the
22nF 2 C14, 15
centre contact of the switch to the IC3/1C4 side
39nF 1 C10
of the cut.
Now connect one pole to the output of the
100nF 14 C3,4,5,7,8.9.13,17,19,26,27,31,32,33
1p F 1 C30
interface board and the other to the IC2 side of
Electrolytic
the cut. The 5V for the interface may be
4.7p F 2 C11, 16
connected to the output of the regulator IC19.
10p F 1 C29
The 'Robin' may now be run from the external
470p F 1 C34
standard with a very high degree of accuracy.
Trimmer
PW
60pf 2 C2, 21

Semiconductors
2N3819 1 Trl
BC239 3 Tr2, 3, 4
MC1496 1 ICI
LM324. 1 IC2
CD4046 1 IC6
74HC390. 2 IC4, 5 We apologise that due to lack of space and
74LS132. 1 IC3 production difficulties, the necessary
74LS90 1 IC9 printed circuit board designs and
The original PW Robin article (by Mike 7805 1 IC7 associated component overlays for this
Rowe G8JVE) was in the July and August 7812 1 IC8 project will appear in next month's
1991 issues of PW. Errors & Updates 1N4148 3 DI, 6, 7 (January 1996) PW. Please accept my
appeared in September and October of that BB204. 2 D2, 3 apologies. Rob Mannion G3XFD.
year. IN4001 3 D8, 9, 10
In the September 1993 issue of PW Mike
Hughes showed us how to lower the power Miscellaneous
requirements of the counter. I.e.d.(red) 1 D4
Over a year later (October '94) Mike I.e.d.(grn) 1 D5
Rowe put a thermal oven into the PW XL I 1 10MHz (Maplin)
Robin. In the same month George Fidler You will also need a 1A fuse and holder, one 15-0-15 6VA (Maplin) transformer, one LW Ferrite
G3TDV extended the Robin to count time Rod (Maplin), one 150mH Toko coil, one 250pA meter, heatsink for IC7/8, Case (Maplin
and capacitance. KC61R), BNC sockets (2 off); IC sockets (if required)

Practical Wireless, December 1995 33

 IF YOU DON'T WANT TO TAKE ADVANTAGE OF MY FREE FINANCE

WOO N YYNre
AND WOULD RATHER PAY CASH. CHEQUE. CREDIT CARD OR TRADE-
IN. THEN CALL 0181 - 566 1120 TODAY FOR EXPERT ADVICE. I

promise you the best overall deal in the U.K. Get ringing. or you'll
miss the bargains!
G4HKSL 'Please NOTE prices & monthly payments are based on 17.5%
VAT & no more price increases!
FAX: 0181 - 566 1207
AFTER HOURS: 0973 339 339
E&OE. £10 p&p on all malor Items.
THE AMATEUR RADIO EXCHANGE CENTRE Marten Lynch is a licensed credit broker. Full written details are amiable op request B.B.S.: 0181 - 566 0000

A big thanks to all of you who sent their kind wishes

on the arrival of our new baby son, Henry.
Jennifer is doing just fine and so is our new member of the Lynch We are now able to offer the new FT -290R Mk2 with a muTek optimised pre -amp
supplied & fitted FREE OF CHARGE , a saving of E79!! The improvement to the
family, There again, naming the kid after a world famous DX'er he had receive performance is incredible. Better still, it's available on FREE FINANCE'
Deposit £95,
to be okay, didn't he?! 12 payments of
£42.00.
Total: £599.00
FREE FINANCE.

QUESTION
L All the major OFFER EXTENDED
" brands on show, UNTIL STOCK IS
side by side FINISHED

Why does MARTIN LYNCH continue to outsell ALL of

aonMajor
site.
Workshops 100W on HF
10IN on 6M
his competitors, when it comes to HF Equipment? aw distributors
No "waiting for
ALINCO DX70
ANSWER... repairs"
Alinco's answer to the IC -706.

A mini HF transceiver with all

Firstly, most other retailers wouldn't dream of investing in the The only retailer
modes from 160M - 6M. General
Coverage RX, remote front panel.
"top five" HF transceivers just for demonstration, then carry a ir with a Compare the receive audio on
back up stock, should you decide to purchase. Does your store "Customer both. The Nina, will surprise
have ALL the HF transceivers available today, sitting side by side, Service Desk" to you and the CW and SSB narrow filters are thrown in FREE, they'll cost you

with an antenna available for each? I gather probably not. assist with £120 '

problems -
Investing in any of the new HF transceivers is a major investment. whether you THIS MONTHS XMAS PRICE BUSTER: £999 1

You can buy from someone who's only method of sale is to "give have purchased r ,

it away" for no profit, (usually resulting in poor back up and little from us or not.
product knowledge), or spend time with one of the Lynch team \ ryi
who will question your actual requirements and guide you to the L The only
real item on the agenda. What's right for you. Not the salesman. company ii-AILIJJ JJ-J(JJ Vell.kroa

offering 5 Years Currently our best selling Dual Band Handle

Martin Lynch is the only company that sponsors the RSGB HF Convention each year, Warranty on new Simple to use, beautifully built,
usually with a top manufacturing company such as Kenwood or Yaesu, both of which or 15 months on £479, £79 deposit and 12 payments of only
are happy to be associated with the U.K's No. 1 retailer. When buying a major piece of Used. £33.33, ZERO INTEREST
HF gear, (or any other for that reason), check to see if the company is capable of first
THIS MONTH!
demonstrating the radio itself, (you would be amazed how many retailers can't), can
offer REAL back-up in the event of a break down, collects at the company's expense in
aw Retailer
The only Radio
asked to
FREE FINANCE AND FREE CARRY CASE

the event of a warranty claim, offer a 5 Year trouble -free cost free ownership period,
back the RSGB
offer top trade in values and will offer a "MONEY BACK GUARANTEE" if the item
HF Convention
purchased is not suitable*
More and more Radio Amateurs WORLD WIDE use Martin Lynch. The better the company service gets, the
bigger they get. It's that simple. The success is fuelled by GOOD QUALITY SERVICE, before and after the sale.
Mail order or visiting the London Showroom, the treatment is always the same. Friendly, non pushy and
genuinely interested in helping. If you haven't dealt with MARTIN LYNCH, perhaps now is the time. 50150
Prorated Ow yoods are We compete and 'as row duraldion is,rodiry a.. sirsaay.r,i krone., outs PURCHASE PLAN

Wouldn't you rather use Martin Lynch? The new "DSP at I.F." world first from KENWOOD has only been out a
month and what a winner' ff you've been hanging on for the digital age to
arive in Ham Radio, then let go. One of my older & valued customers,
G8DR was the very first in the U.K. to own one. "The reduction in

Built like a tank, the no frills" 50

MFJ 784B background noise is astounding", remarked Derek. 'I can now hear signals
I didn't even think existed" The 5050 Plan was so successful, its been
extended for December.
watt FM mobiletase 2 metre Not the prettiest looking of DSP units, but the favourite when it comes to all

transceiver from Yaesu is ideal for mode noise reduction

TS 870S £2399.00 WITH FREE 5 YEAR WARRANTY
packet operation or very very long
"rag chews". Probably the best SPECIAL CHRISTMAS PURCHASE DEPOSIT 50`., £1199.00 for your trade in's as pan payment!
Balance £1200.00
low IMD transceiver available it PRICE! RRP: £249.95 only £219.95.
its class. 12 monthly payments of only E100.00. INTEREST FREE ZERO APR.
(whilst stocks last)
RRP £399 Lynchy Christmas price: £319.00
1 t (.1

WE NEED YOUR If you have any good, clean J.rLJ JJ J.r1J

USED
Amateur Radio Equipment or
Accessories, give Martin
')',14J19(1)1 ..ast chance to buy with FREE FILTERS! Just when you thought you had a
great deal, Yaesu go and step in with £178 quids worth of FREE OPTIONAL
AMATEUR Lynch a call today and receive 10 watts on 6 metre FM. With all LAST CHANCE TO GET :ILTERSI I'm afraid to tell you guys that "DINNER WITH MISS YAESU
the new repeaters opening up,
RADIO TOP MONEY - ON 6M FM! U.K.", Shirley is now fully booked. The FT -990 is available with or without
now's your chance to join the
EQUIPMENT!! CASH instantly 'friendly" atmosphere of the
AC PSU. sports an internal lightning fast Auto Tuner and has "digital"
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HAVE YOU GOT A COPY OF THE LARGEST USED in January'
saving over RAP'
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EQUIPMENT LIST IN EUROPE? CALL 0181 566 1120 RRP: £359.95.
DC model: RRP £2099. LYNCHY PRICE: £1599.00
FOR YOUR LATEST COPY. ASK FOR THE WINTER
NEWSLETTER TOO! CHRISTMAS PRICE BASHER: £269!! LIMITED STOCKS PHONE BEFORE PLACING ORDER
140-142 NORTHFIELD AVENUE
OPENING HOURS

MON-SAT
Sala/Say. Milt /Vane bite - a dal 1 izeonemite4
9.30 - 6.00 a a A al Last year nearly a thousand people poured through the door
EALING, LONDON W13 9SB Late noght Thursday hy
umtr... is.
and grabbed tens of thousands of pounds worth of
equipment at virtually trade price.
Don't forget MORSE TESTS ON DEMAND at Lyric hy's open day!

81 81 -588 1 120 `11.011.k

Martin Lynch Open Day
The doors are open from 9.00 to 6.00

STOP

9(P) PRESS!! NEIL SOUND -APO

Still Yaesu's OSIVT
flagship '200 KEN Hell Preset -5 Professional Quality Boom Headset, dual padded
wetter", the FT mic boom, includes HC -5 'Full range" insert for superb
1000 is built to -aquires A1:1-1 cable ADAPTOR for KENWOOD1COM.
last. At an RRP of E1 19 95 incl VAT
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dropped off a i" sized HF transceiver hass Hell Prose( -4 Identical to Proset-5, but includes HC -4 'DX'
favour is
ittle, (Motor Cars, Motor Bikes or the odd pet taken in Part exl, Yaesu U.K. Bulk purchase of your
money saving
offer. T T5AT microphone insert. Ideal for punching through the pileups. £119.95 incl.
a spectacular transceiver, including a
told me they have a few on a special Christmas offer and did I want to grab to offer them on VAT
all mode HF
a few? They are not 'old stock', (check the serial number of yours BEFORE full feature 10044 £1649.00 but
despite its size, a The list price is
you place an order), they're fresh and you can save a massive £1100. Buy in IF Shift and much more. a
built in AUTO ATU, FREE DELIVERY, saving Hdi HC4 Replacement microphone insert for existing fist or base
December and pay £2899. £1195 including
10 pieces at only microphones. Wth 1008 peak at 2KHZ and the low end rolled off sharply a:
we are offering
massive £450.00l1 500HZ,112DB per octave), the HC -4 is the ultimate DX mic insert. £28.95
and 12
FT -1000 RRP £3999. Lynchy Price: £2899. Super Low Finance and FINANCE at £196.00
available on FREE bid VAT
Furthermore, it is
payments of £83.25
Who else can offer those two. PART EXCHANGE WELCOME!
Iv
EE 40. 11C4 Identical to HC4, but High Articulation, offering superb SSB
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SAVE A F," SS9 Audio f28.95 aid. VAT

ONLYSOHURRYLEFT
Heil AD1110 Adapter leads to interface the prose( Headsettoont'
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The magic in the new
Yaesu HF transceiver is tne
inclusion of "COLONS'

\2t9JJai
5 Years warranty
filters. The result is audio
included. Low finance
that harks back to the 'S
L (JJ'i1 J and your trade-ins -r
Line" days. Rounded, full
welcome. PK-12 Low cost budget VHF TNC now
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The orders keep rolling in
with FREE software £119.95
crispness that is easy on the ear. Add to that the latest in technology with
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transceiver was a wine it would be a Cabernet Sauvignon. For those of you new design the 5 Year
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visiting the shop to 'try before you buy", you'll get a FREE BOTTLE of warranty is ever more a
the bench mark £299.95
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FT-1009MP RRP £2840 with Internal AC PSU.
PLUS A SET OF FILTERS WORTH £468 supplied & fitted FREE!
or FIVE YEARS WARRANTY. The choice is yours. (1 (1

J J J J -L/ J Built exclusivly for MARTIN LYNCH, the new wire

The only HF transceiver to offer 100 wars on HF through to six metres, built in antenna is trapped for 80 through to 10 metres, uses heavy
Special PSU, Auto ATU and lots more. Fantastic yalie guage multi strand plastic -sheathed wire, heavy duty 1 kW
Christmas traps and totals only only 20 metres in length. The
ICOM ICIT151311 Price
RRP £1969.

Lynchy "MULT1TRAP" is a fan type design, having 2 legs" either

One of our favourite
side of the dipole centre. It's very easy to instal, takes
Christmas price: £1649.00 minuets to tune, guaranteeing an SWR of less than 1:5:1 on
200 watt HF DSP
spot frequencies throughout the entire 5 bands. A far better
Transceiver. Now 35 of
rI alternative to the old G5RV antenna.

j
I
our customers seem to
SPECIFICATIONS
agree. Like the rest of
Impedeance 52 Ohm Max SWR 15.1
Introductory price:
the HF range, see the J J J Overall length 20m Weight 2.5Kg
s sitting side by side each of its compettors. T':e guys here reckon its the best for low Power Handling. I kW Input socket. S0239 £69.95 polo £7.51
MD on 270. They're probably right. 50 watts
IC-775DSP. RRP £3699.
on 2M, 35 on 70CM. Easy to use. Even easier

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 /".

- e- t"
AA
L
Keen constructor Stephen Harding G4JGS dishes up some more
ideas and suggestions which help him enjoy the hobby and right techniques!).
produce excellent home -brewed projects. He aims to help you It was class A or bust, so I taught myself
Morse, passed and got my licence. But it was
to do the same in your workshop. then back to that dreadful dilemma that seems
Amateur Radio is different things for However, we found that the village rubbish to have haunted my life.
different people, that's one of the tips were a wonderful source of old radios With a young family, finances were always
things that makes it so interesting. which could be stripped for components. I severely stretched so there was no money for
My interests in radio began in my learnt a lot about how they were constructed radio. So it was a case of adapt, scrounge,
early teens when valves, dry batteries and and started something my colleagues say I improvise and build from scratch.
accumulators were still an everyday part of have perfected...the art of scrounging and Again it was whatever local ingenuity could
radio for many households. barter. devise but it got me on air with about 500mW
You had to do things to the radio, besides of c.w. on 1.8 and 3.5MHz using an ex -Army
turning it on, to make it work. One of the great Full Member 62 set. 'Phone operation came later when I
highlights of using radio, was illicitly listening rewound the modulation transformer to
to Radio Luxembourg in bed snuggled down From those early beginnings right up to today, produce a pretty grotty a.m. signal.
under the sheets with a pair of earphones on. I've been a full member of the 'Bin Divers
Listening time was usually limited by the Society'. My shack is filled, much to my wife's Battery Powered
time before parental detection (and annoyance (but children's delight) with things
confiscation of headphones) or when the dry that will come in useful one day. The equipment was still battery powered. So, I
batteries 'went flat'. (These, scrounged from My friend who I had used the army sets set about designing and building a power
Grandma's hearing aid when they were a bit with went on to become a TV salesman. But I supply which led me into the most painful and
low, usually ran out completely on the radio!). stayed at school studying for '0' levels and sobering experience of my life.
On my schoolboy pocket money, buying playing radio in the Army Cadet Force Two h.t. voltages were needed, one for the
new batteries was out of the question, so local (something which I still do). receiver and one for the transmitter. By using a
ingenuity came into use. By remaking the dry Exams continued to dominate my life for transformer with centre tapped secondary
batteries, it was surprising how well you could the next few (too many) years so my interest in winding and a full wave rectifier I could do
extend their life. radio waned. This however, changed when I exactly what I wanted, see Fig 1.
But the downside was that it was a took up a teaching post in a school which has
surprisingly messy process which brought me an Army Cadet Force (ACF).
I Woo 1 = v,
into regular conflict with my Mother. I I became involved with the ACF and found
persevered, and it paid off. to my absolute delight, a room full of radio
240V ax
equipment. They included 19, 52, 62, 88 sets Output 2 = 2'V,
Receiver Kit and many others. N

In a very short time I had a fully working 0V

Having decided that it might be better to radio station. Along with them came the legal
encourage me rather than beat me, my parents entitlement to use ACF allocated military
bought me a two valve short wave receiver kit frequencies and a stack of books telling me Fig. 1: A 'two rail' h.t. powers supply
and a soldering iron. I built the radio, and how to make the best use of it. design used by G4JGS (see text).
guess what, it didn't work! Now I began to understand what I had
At that stage, I hadn't a clue where to start found by practice all those years ago. I was So I set to and built the p.s.u. I started by
so I took it to bits and started all over again. By 'hooked' on the magic of this piece of wire bolting all the components, some of which
this time, I'd learnt how to solder and I guess hung out in the air on which I could hear the were pretty bulky into an old military radio
this was the key skill that really enabled me to world, but only talk to bits of Great Britain and case whose shape did not allow the most
enjoy the magic of radio and with my parent's occasionally Germany and Ireland when I practical layout.
blessing. could get away with it. I then started to wire things up and shortly
Shortly after this, a cousin of mine gave me the whole thing resembled a form of
a couple of ex military radio sets. Neither Radio Amateur's Examination multicoloured spaghetti. It was a real rat's nest!
worked, so out came the soldering iron and To cut a long story short, something wasn't
within a very short period, both were working I had to take the RAE, and along with a small right. And while I was leaning over the power
again. group of others, studied under the guidance of supply, the transformer blew up showering my
Then it was back to Grandma to scrounge the late Graham Fox G4GIW/G8FGP. face with molten plastic and pitch. The
the hearing aid batteries again, and a friend Unfortunately though, I had very little transformer had got so hot that it melted the
and I had a great means of communicating scientific background, physics having given up pitch round the windings which in turn
between our two villages. The radios gave us on me because you had to be in top set Maths ruptured the plastic case.
many hours of fun and we learnt how to get to do Physics, and I wasn't! I spent three very painful, dark stumbling
the best from our sets the hard way because in Because of my lack of physics I had to learn days cursing my folly and wondering whether I
our remote part of agricultural Berkshire, there the theory from the bottom up and it was a would see again. I was lucky I am pleased to
was no one to turn to for advice. struggle. However, I passed the RAE well say.
If it didn't work, we had to fix it. Spares because I had learnt the licensing regulations
were a real problem with the nearest Army off by heart, and I chose all the questions Your Workshop?
surplus store being in Reading for which the requiring a practical approach for Paper 2. (I
return bus fair was half a week's pocket was lucky because I was working in education What has this got to do with your workshop
money. and knew how to beat the exam by using the you might be asking? Well, for me, as I have

36 Practical Wireless, December 1995

 complete a good soldered joint. An iron of
15W used carefully will be satisfactory, but a Ten tips for good soldering
25W iron is better. 1 Thoroughly clean component legs
Low voltage irons are best because if you and other surfaces to be soldered.
do solder through the lead, at least you are 2 Use thin, flux -cored solder.
isolated from the mains! They also have the 3 If you can make a good mechanical
advantage that they can be run from a couple joint first, do so.
of car batteries for field days, holidays and the 4 Use a hot iron.
like. 5 Make sure the bit is tinned before use.
A very nice feature, though not essential, is 6 Wipe the bit on a damp sponge before
the ability to be able to change the size and and after making a solder joint.
shape of the bit. This can be done to suit the 7 Heat the joint, not the solder.
Fig. 2: A temperature controlled work you're doing. 8 Inspect the joint after soldering before
soldering iron station (in this case a Whatever type of iron you have, when not going on to the next one.
Weller type), with the associated in use, it should be in a stand to protect you 9 Once the joint is good, cut any excess
stand and essential sponge (see text and the iron from damage. The stand should component leads off with a sharp
for comments on techniques). contain a small sponge which is kept damp. cutter.
tried to show, the emphasis has always been Every time you pick the iron up to use it, 10 Remember not to inhale the flux
on making or adapting things at minimum wipe the tip on the sponge to clean off any fumes.
cost. dirty residue. After you've used the iron, wipe suspect, should be carefully reheated to make
Providing you can solder, use a few simple it again before putting it back into the stand. a good joint. Don't overdo the heating or you
hand tools, use your ingenuity and be Using the sponge soon becomes a habit. may lift copper tracks off p.c.b.s or damage
prepared to have a go, it is surprising how The photograph, Fig 2, shows a temperature sensitive components.
much more satisfaction you can have. controlled low voltage iron which can be An illuminated magnifying glass is very
Let's look at soldering for a start. To many picked up very cheaply second-hand. useful for looking at solder joints (and it's the
people, soldering is a form of 'glueing'. sort of thing you can ask your children to give
Providing the solder holds the bits together, Soldered Joints you for a birthday or Christmas present). Once
it will do! Unfortunately, this is usually far you are satisfied with the joint, cut off any
from the truth. Now to making soldered joints. If you can excess lead with a sharp, and I mean sharp,
The art of soldering is to form a continuous make a good mechanical joint by winding the pair of wire cutters, as already shown in Fig 3f.
bond of metal all over the surfaces of the joint. component lead round things like solder tags
The worst enemies of good soldering are dirty do, Fig 3a. Not only will it hold things in Wiring Layouts
surfaces and not enough heat. place, it will be a much stronger joint.
Many components, especially those that When working on p.c.b.s, push the Now to another of my 'hobby horses'....the
have been recycled, have leads which need component lead through the hole and bend it subject of wiring layouts. When I first started
scraping to remove the oxide layer that may sideways, Fig 3b. Then apply the tip of the iron dismantling old equipment, wiring was an 'art
have formed. It's best to place the component to the joint and heat it, as shown in Fig 3c. form' with cable runs neatly formed with
lead on a flat surface and scrape it with a sharp When you think the joint is hot enough lacing thread.
edge, such as a modelling knife. (only a second or two should be needed) The art of lacing seems to have disappeared
Printed circuit boards should be rubbed gently feed the solder into the joint, as in Fig and has been replaced by modern methods.
over with steel wool or a p.c.b. cleaning 3d. The idea is to use the heat of the joint, not However, the underlying principles of good
'rubber' until they are bright all over. Keep the heat of the iron, to melt the solder. wiring remain the same.
your fingers off while you're doing it, there's Keep feeding the solder into the joint until My advice is don't just use any old cable.
nothing worse than finger grease for attacking there is sufficient there to make a good joint It's really worthwhile investing some money in
the delicate copper tracks and making bad and you can see it 'wetting' all the surfaces, as a small drums of five or six different colours.
solder joints. in Fig 3e. (This illustration also shows the Red and black cables are a must for power
Choosing the right solder is important too. excess lead trimmed, with the actual process feeds and earthing points. But how you use the
For Amateur Radio and most hobby electronics underway.) other colours is up to you, although I think it's
construction, flux cored solder should be used. Try not to inhale the fumes produced by the worthwhile setting your own wiring standard
The flux is a chemical that helps removes melting flux as it is not good for you. Wherever and sticking to it for all your projects.
surface oxides and prevents them from possible, use an extractor fan when you're You may find a visit to one of your local
reforming during the soldering process. The soldering. electrical installers will enable you to buy
solder should be thin so that it melts easily Remove solder and iron and let the joint cheap drum ends. The illustration, Fig 4,
without drawing all the heat from the joint. cool before inspecting it. It should be shiny,
Be careful not to buy solder intended for smooth and 'feather' into component leads Figs. 3a, b, c, d, e and f: Soldering
making joints in copper plumbing, and don't smoothly. techniques recommended by
waste your money buying solder in a Anything which is dull, rough or otherwise G4JGS (see text for explanations).
dispenser. Just buy the biggest roll of solder
that you can afford. If you really want a
dispenser, you can make one from an old lb) (c)
plastic cosmetics or soap bottle. cow.
Coast bowl

The Iron
The soldering iron is important. It needs to be
light enough for you to use comfortably, and it
should also have a long very supple lead (d) Use shop coder.
(e) (f)
to Iron Ow some
preferably covered with heat resistant material. ised so On po.

If the lead is damaged in any way, don't use

the iron. Either replace the mains lead, or the
iron.
Additionally, the iron itself must be
sufficiently powerful to provide enough heat to

Practical Wireless, December 1995 37

 'lay' to it. I always leave the supply wires to haven't either!).
last, and I don't fit them until I have very My 'shack' is a steel cupboard and a bench,
carefully inspected the wiring layout. Fig. 5, in the garage. The steel cupboard
After the supply lines are in, test. If all is houses the radios and is the operating 'nerve
well, shrink the sleeving and use a few centre' shared with 'Number 2 son' (who was
strategically placed pieces of double -sided 2E1CQW and is now G7UUX, following the
sticky tape to secure it all in place. results of the May RAE!).
As an alternative to heat shrink sleeving, The bench is widely used for a great range
you can use spiral cable wrapping. But be of activities from mending the car and making
warned...it's not cheap! household repairs. I also use it for 'pricking
When I cut a wire to length, I use good out' the bedding plants as well as building
Fig. 4: A completed 3.5MHz c.w. sharp pair of wire cutters and with a stripper, electronic devices.
transceiver built into a (recycled!) cut back the insulation about 3mm. You can So, there's no reason why you should not
former television camera case! (see work off the kitchen table providing you
text). Ten tips for good wiring protect it. Many PW and Radcom articles have
shows the wiring layout in one of my layout been written on this subject.
construction projects, a 3.5MHz QRP c.w. Plan the layout first. My experiences in amateur radio gave me
transceiver. 2 Keep signal and supply lines the opportunity to learn about electronics,
separated. have fun and through trying out loads of ideas.
Plan Carefully 3 Put in all the earth retums and I gained enough experience, knowledge and
earthing tags first. confidence to get a job in the professional
I always try and plan my layouts carefully 4 Fit the longest wires first and work broadcast electronics industry and I still enjoy
before I commit myself. In my experience, down to the shortest. this wonderful hobby!
there is no substitute for paper, pencil and 5 Use small pieces of heat shrink PW
ruler. sleeving to hold the wires together.
At very least, you need a block diagram 6 Strip the wire ends, twist the strands
showing what is coming into and out of each together and 'tin' before fitting. Ten tips to keep the cost
block. From this you'll know how many wires 7 Wherever possible, make a good down
mechanical connection before had it, don't buy it.
you will need and you can decide whether
soldering. 2 Scavenge everything that might be
single or multiple wires, ribbon cables, etc.,
8 Use tweezers to hold and manipulate useful one day.
will be the best answer.
the wire in inaccessible places. 3 Barter and swap what you can't
You can also plan cable routes and (a very
9 Pull each wire into the shape of the scrounge.
important aspect), the location of all earthing
case. 4 Use local ingenuity copiously.
(Ovolts, signal returns) points. Here you can
10 Use double -sided sticky tape to hold 5 For every new part, use at least three
spot the easily made mistakes like running a
the wires in place. recycled parts.
signal line next to the power input to an
6 Look for a cheaper alternative.
oscillator, a connecting pin in an inaccessible
use pliers or wire cutters to strip the wire, but it 7 Do I really need this project?
corner and so on. Don't be afraid of trying
needs practice to be able to do it reliably, and 8 Plan things carefully.
different layouts to see if you can improve
all too often the wire gets shorter and shorter 9 Modify something you don't need or
things.
along with your temper! use.
Each wire end is then lightly tinned after 10 Keep a folder of useful information,
The Case circuits, specifications etc. and try
the strands have been twisted together. Solder
the least accessible end of the wire first, thread and use the ideas.
Once I'm satisfied with my layout, I mount all
it through the sleeving and then solder the
the hardware bits into the case. All control
shafts are cut to length, knobs fitted, switches
other end in place.
mounted and labelled in pencil so that when Pull the wire into shape, and then go on to
the wiring up is completed, it can all be tested. the next wire. In confined spaces and awkward
Some people advocate wiring everything corners, I use a pair of bent tweezers to hold
up and testing it before boxing it up. But I've the wire. Not only do they take up less space,
seen too many piles of electronic 'spaghetti' in but if you slip with the soldering iron, you
don't burn your fingers!
shacks where projects have never been really
completed to be convinced this is a good idea.
The next stage is to wire in all earth points,
Professional Appearance
and these should be as short as possible. If you
try and put these in later, you may find it Ii you've made a good job of your project, it
difficult with longer wires around. will not only give it a professional appearance,
Then it's onto the longer wires. To keep you'll be able take it all out of its case while
them together and tidy, I use heat shrink it's still wired up. That way when you paint the
case, the paint only goes on the case, not the
sleeving. This comes in a wide variety of
colours and diameters. contents!
When the sleeving is gently warmed with The illustration, Fig. 4, shows the case of
the tip of the soldering iron or a hot hair dryer the QRP transceiver. The case is recycled from
it shrinks. It then holds the wires tightly an experimental TV camera control box that
together.
nearly got thrown away!
The professionals almost completely encase
their wiring in sleeving. But unless you have
access to a very cheap source, I suggest you
Final Advice Fig. 5: Successful home -brewing does
only use short pieces about a centimetre long not need a huge workshop. Stephen
placed so they will give the wiring a nice form. My final short and simple advice is, don't let Harding's home -brewing facility only
Pass the wires through the sleeving as you anything put you off! And don't make excuses, occupies a small section of his
solder them in making sure the wire has a nice like "I haven't got a well equipped shack" (I garage.

38 Practical Wireless, December 1995

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Practical Wireless, December 1995 39

 Pr*

Ben Nock G4BXD shares his experiences as a 'disabled' enthusiast working in many aspects
of practical amateur radio.

Glad as I was to be asked to effects of those minor explosions

contribute a short article to the were doubly worrying. But
'Workshop Special', with perseverance will always win out, or
directing attention towards the so I'm told.
'disabled' (or whatever this week's
'politically' correct term is!) constructor, I Space Consideration
had to stop and think. Just what is it about
my disability that required special I suppose that space should be the
consideration? For (like most disabled folk first consideration. And this can bring
I'm sure the problem is that to us, we're its own problems.
the 'normal' people! The normal concept of a disabled
On leaving school I got interested in person is that of someone confined to
electronics. In fact, since the last year at a wheelchair. This, of course, can
school (too many years ago for my liking) I give rise to difficulties in reach and
have been hitting things with the 'Black lifting. Although a motorised chair Ben Nock G4BXD hard at work on his
Country screwdriver', prising out valves would be great help to me, it would workbench. The 'third hand' being provided
and generally messing about ever since. In make carrying military stuff easier, and by the portable vice on the bench. Note the
the beginning of course, it was mostly getting back from the pub a doddle! rubber bands on the hand -tools, to provide
guess work..."lets try this", quickly Space, if you have it of course,
necessary grip (see text).
followed by the inevitable shower of should be used wisely. Remember that
sparks and explosions. remarkably true saying that 'we expand to the cost of tools. Although it's very nice to
*Editorial translation. Wolverhampton fill whatever space we have'! have brand new shinning tools, all
Library, who specialise in the local 'Black Shelves are very handy. But make sure hanging on pegboard, labelled and clean,
Country' dialect provided confirmation they will hold whatever you intend to put in reality it's different.
that this tool is in fact a (large) hammer! on them, brain damage is hard to repair. Most of us have a tatty old tool bag or
Editor. If you are going to try your hand at box if we're lucky. But, given a few trips to
construction it helps if you have a space the boot sales, we should be able to amass
Servicing Course that can be called your own. This is a fairly well equipped armoury for little
because there's nothing more off-putting to outlay.
Opting for a spell at Garrets Green the new constructor that to have to keep
Technical College on a Radio & TV putting away their tools just so as the Clamp Aid
Servicing Course, things started to get a inconsiderate family can have its dinner
little more organised. Now it was "ahh, on the dining room table. Small portable vices, of the type that either
You should create your workspace at clamp to the edge of the work surface or
the right height, the right depth and make even sit on top of it on a wide base, have
sure it can carry the weight expected. The been an invaluable aid for me. These
quickly followed by the joy of constructing can be hampered by portable vices are very useful in holding
inevitable shower of sparks feeling tired due to working on the wrong the various bits of plugs and sockets that
and explosions!" height of surface. seem to take three hands to fabricate at the
You have to be 'in the mood' all the best of times.
time and the right working environment Any job that requires a couple of
will greatly help. Correct use of lighting is components to be soldered together,
this is the faulty bit" (followed by the essential. As well as the room light, I use requiring two hands for the components, a
explosion)....", but there was that one of those adjustable angled lamps that hand for the soldering iron and a hand for
necessary air of confidence starting to can be positioned just where wanted. It's a the solder itself is made all that easier with
form. great help in small jobs. the help of a vice.
Practical experience is a great teacher. And it's a fact that you can never have
Books are fine, but a few light explosions The Tool Rack too many screwdrivers. Invariably the most
tend to sharpen up your response times stubborn screw will have a different head
enormously. Easily the most important bit to any to the two drivers you already have.
Although I am regarded as a disabled workshop, be it for the able or 'disabled' Another useful tool is the electric
person, some would say I was more able constructor, is the tool rack. There's an old screwdriver. These can also be found at
than most 'normal' folk. As I was born saying that 'any job is easy with the right boot sales, both of mine were obtained
without complete arms and with a only a tool' ...and I fully agree! this way and cost only £2 each complete
single finger on either side, I've always I've been to other shacks where the with the charger !
had difficulty with the simplest things, occupant is attempting open heart surgery
including gripping and lifting, and paying on a set with nothing more that a pocket Useful Idea
my way at pubs, etc! screwdriver and an old ball pen case. It
If you only have little grip then getting just won't do you know! Continuing on with tools, another useful
out tight screws can be a real pain. And With the present popularity of local 'car idea is to magnetise the screwdrivers. This
when coupled with limited 'reach', the boot' sales, there's no need to worry about can be done by simply drawing them

40 Practical Wireless, December 1995

 on 955kHz to
30.455MHz...a
feature we can use to
advantage.
Nearly all receiver
oscillators can be
heard outside the set
and be used as a
signal source. Of
course the stability
and drift are
dependent upon the
quality of the
receiver, but, in place
of nothing better, it's
an easy option.
Scanners also
make ideal frequency
counters. If you are
trying to tune up a
piece of surplus
p.m.r. gear onto
144MHz for instance,
a scanner can be
used to listen for the
correct harmonics of
the multiplier chain.

Power Supplies
Annotated photograph showing Ben's workshop Equipment Index: (A) 'scope 20MHz or better;
(B) signal generator 1 -220MHz a.m./f.m.; (C) spectrum anaylser 0-1GHz; (D) 2 - 30V p.s.u./A; (E) Bench power supply
13.8V 4A p.s.u.; (F) frequency counter 600MHz; (G) power meter using v.h.f./u.h.f.; (H) a.f. signal units (p.s.u.$) can be
generator; (I) f.e.t. multimeter. (see text for recommendations on equipment.) the first construction
project. There's little
across the back of a large speaker magnet invaluable. That might sound strange...but point in spending
several times. to 'able handed', holding a nut with pliers loads of money when some of the test
A magnetised screwdriver is most while tightening or otherwise is easy, equipment can be easily home built.
useful if a screw drops into an enclosed however, for those of limited grip holding There are many circuits for p.s.u.s, but
space. Of course, this trick will not work a small spanner onto the job is a lot obviously take care with the mains side of
with brass screws, but, a little candle wax simpler. things. But if you approach the task of
on the end of the screwdriver will also A small adjustable spanner is most building a p.s.u., then simply read up on
generally help out in this case. useful as are a few in more usual larger the subject first before proceeding with
Really good pliers and cutters are the sizes, 3/8in, 1/2in, etc. And although straightforward common sense.
other most useful tools. The cutters of proper box spanners seem quite Either a variable supply, say 5 to 30V at
course should be kept sharp, as this factor expensive, a small socket set (from car about 2A is quite a useful supply. A p.s.u.
makes it a lot easier to cut the wires! accessory shops) or 'car boot' sales, can be with several fixed voltages, say 5/12/24V
Using cutters for trying to snip screws most useful in many instances. at about 2A, will also be handy.
and bolts, etc., will not only ruin and blunt Many more mobile sets are around
the cutter but make it useless later on for these days, so a 13.8V supply capable of
small wire jobs. If you stick to using the Test Equipment anything from 10 to 30A would also be a
right tool for the job then life afterwards is good thing to build. A 13.8V 25A p.s.u. is
made easier. Test equipment is of course one area quite easy to construct, and there are
Even simple pliers are most useful, where a little expense will be incurred. It many circuits in books such the ARRL and
along with the vice, for holding things. An has to be said though, that a small outlay RSGB manuals will show you how.
elastic band around the handles will make in the test equipment department will
them into a pair of grips and can be used make many tasks much easier later on. Signal Generators
to hold components in place while you In my opinion, probably the sort of
hold the other one, the solder and the iron. items that would be useful include a signal I've looked briefly at simple signal
You should also obtain (at least) a pair generator, and an obvious choice, a test generator sources (using the shack
of pointed nose and a pair of wide flat meter (analogue or digital). I would also receiver), and audio generators are again
nosed pliers. And it's also a good idea to include frequency counter, a power meter, quite easy to build. There are several one
ensure that the handles have a good dummy load, a valve and transistor tester 'chip' circuits that provide sine, square
gripping surface. and a good power supply. and triangular waveforms which run on
I have obtained, over the years, a good batteries and end up as quite small units.
selection of test gear but for those starting However, radio frequency (r.f.) signal
Handle Sleeving out there are easier options. Take a general generators are a different kettle of fish, and
coverage receiver for instance...they can chips. Don't forget, that if you are going to
If the handles on your tools are of bare be very useful. use a generator to align sets, then the
metal, then some heatshrink sleeving Assuming a 500kHz to 30MHz generator itself needs to be stable and
(possibly several layers) is a good idea. coverage and a modern receiver, you not accurate.
This will really help you grip them. only have a frequency measuring facilities, Low frequency generators are perhaps
Personally, I find a good selection of you also have a wavemeter and a signal not too hard to get going. But once you get
spanners, small ones from 8 to 4BA plus a generator. Assuming the set has a 455kHz over a few MegaHertz then stability and
similar range in imperial measurement, are i.f. then the local oscillator is most likely accuracy can be hard to achieve.

Practical Wireless, December 1995 41

 It might be wise to start with building way of coping rather than to wear away at
an audio and LC frequency generator and your teeth, I am sure all the dentist
rely on a bought -in signal generator for amateurs reading this will agree. I have
hi., v.h.f. and u.h.f. work. To this end, recently had a pair of gum shields made at
many of the older Marconi generators (and my dentist, in an attempt to slow down
other types) can be quite cheaply tooth wear, perhaps worth thinking about
purchased at rallies and shows and will in other cases.
serve the amateur constructor quite well. Editorial comment: Having also badly
damaged my teeth by using them as wire
lips And Ideas strippers/grippers and pliers over many
years, I fully agree with Ben. It's all too
Time for more tips and ideas now. Simon easy for 'digitally disadvantaged' radio
GOTHS, has passed on an interesting idea enthusiasts to fall into this habit. Avoid it
for those of limited grip. at all costs and let the Dentist earn the
Simon says "I am disabled due to an (around £160 per tooth) 'crowning' fees
accident six years ago that left me just the from elsewhere! G3XFD.
use of my right arm. I still do the same
work on radios, etc., that I used to do Aids & Gadgets
before the accident but I kept coming up
with the same old problem of keeping These days there are many aids and
things still as I worked on them. gadgets around than were available a few
"I tried all sorts of things to get around years ago. I have already mentioned the
this problem but I was not very happy with electric screwdriver. You can even get Photograph illustrating the way which
them. So, after scratching my head a little, screwdriver bits for a normal drill, and if Ben G4BXD uses pliers and a portable
I thought of using something that was very you're using a modern electronically vice to advantage (see text).
cheap and readily available in most controlled drill you have full control over
shops". the speed and other facilities.
"Yes, you guessed it, I thought of the For example, there's a small unit, A Great Joy
'Blu Tack' pliable sticky material and by
'eck does it save a lot of messing around'! I must say that I find constructing a great
joy. It's a great part of the hobby for me
I just get a few small blobs of Blu Tack and 11
there's nothing more and I'm sure a lot more of you could have
put them on the bench, it holds small
radios in place as you work on them,
off-putting to the new a go, and enjoy it....if you can follow a few
p.c.b.s and even microphone plugs. constructor that to have to simple guidelines.
"However, 'Blu Tack' does have one keep putting away their tools Firstly, get some space, you need to be
little problem. It gets very sticky and soft if able to lay things out and leave them in
just so as the inconsiderate place when going to bed (that's if you have
it gets hot. Despite this it's still easier than
using a vice, small 'G' clamp and those family can have its dinner on to sleep of course!).
little 'helping hands' things that you still the dining room table." Next, get some tools. Every job is much
need two hands for! (one to hold the job in easier with the right tool. Removing
place and one to tighten the gadget, etc.)". crosshead screws out with a flat -bladed
With regard to the vices (the 'helping usually seen at markets, etc., which driver is not the right tool for the job.
hands') mentioned by Simon, in my resembles a drill chuck. Into this chuck Then you should get some test gear. If
particular situation, I find the small clamp you can insert different screwdriver tips. you have a bit of test gear, and using it
on vice most helpful. But obviously, if you The chuck fits into a normal drill but it enables you to construct or repair
have the problem of holding one thing has an in-built clutch facility so that over something, you feel a lot happier. A happy
while tightening up just such a vice clamp, tightening is not a problem. With the feeling promotes an increased interest in
then Simon's idea might suit you better. small, speed controlled, cordless drills the hobby.
available today, you should not have to
Rubber Mat ruin your teeth on tight screws! Uphill Struggle
While on the subject of holding things, I Patch Leads For those of you classed as 'disabled', you
would suggest you get yourself a good don't need me to tell you what an uphill
rubber mat to work on. A mat will hold I also find that I can never have too many struggle life usually entails, let alone
things still, stop the odd scratch on the 'patch leads made up. I've found the very messing with a few bits of wire! But I
table top and, if the right sort is found, can flexible connecting wire, multi -stranded, would say, that given a little thought,
provide an anti -static protection if you're fitted with crocodile clips on both ends many obstacles can be overcome and the
working on CMOS devices. especially helpful. rewards for home construction are pride
The type I have on my work bench is In my workshop I have a large selection and satisfaction with a job well done.
smooth on one side and ribbed on the or red and black ones made up and I find You may start with pre-packaged
other. The side I use depends upon how them most useful when constructing. With prepared kits. And even if the p.c.b. is
much grip I want. The ribbed side holds the 'croc' clips on the end I can clip already done for you, with the
screws better and stops them rolling off the together several wires that otherwise I components sorted and fixed, the box
bench. could not hold together while I did already drilled and labelled, so what?
I'm hesitating mentioning holding something else. Have a go, I am sure you will enjoy home -
things in your mouth because I don't Fitting some leads with 'croc' clips on brewing. As I've already said...'More
recommend it. I have suffered with ruining one end and a 4mm banana plug on the power to the Black Country Screwdriver
my teeth, wearing them down other is most useful when using the test brigade'!
prematurely, by stripping wire and holding meter. The 'croc' clipped end can be PIN
screwdrivers. attached to point of measurement leaving
When ever possible I would the hands free to carry out adjustments,
recommend that you try and find another etc.

42 Practical Wireless, December 1995

 eirfreaes

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43
 Wiake &
ntage
Once again it's Phil Cadman G4JCP's turn to
mixer.
look after the PW 'wireless shop'. This month HT+
Break
Next, wire a
Phil suggests ideas on reproducing 'valved' T1
here resistor of between 4
and 1652 between the
audio effects, takes a look at an elderly Cossor positive output of the
C1 i amplifier and the
receiver and recommends some interesting set's loudspeaker.
books for Christmas. The resistor should
be a wirewound type
External
- _ _ _ 12/P Valve11111111til°
amplifier (connecting carbon
Firstly, let me thank loudspeakers found in almost
types in parallel is
those of you who all old radio sets have an
acceptable) of 7W or
wrote in response to impedance of just 312. These
more.
my first column. I do will draw excessive current Fig. 1: Connecting an external There is no
reply to all letters from a transistor output stage amplifier to utilise the cabinet and 'correct' value. Just
although it may take me a designed for 812 or more. loudspeaker combination of the experiment until you
couple of weeks to do so! It's much better and safer
get the sound you
During the weekend of to use an external amplifier want.
August 29 and 30th the BBC between the transistor radio power supply unit kit (LT24B)
celebrated the 50th and the set's loudspeaker. should be ideal.
anniversary of the founding of The diagram, Fig. 1, Take the feed to the Why The Resistor?
the Light Programme. Over shows where to break the amplifier from the headphone
the weekend many archive existing connection between output of the radio. Put a Why use the resistor? It's
recordings were rebroadcast the set's loudspeaker and the resistor of about 22052 (1/8thW, simple really, the series
on the Light Programme's output transformer. Notice resistor mimics the high
or more) across the headphone
successor channel, Radio 2. that one side of the output. output impedance of the
I'm sure many people, transformer secondary is The actual value is not at all
traditional pentode output
myself included, wished to usually connected to chassis. critical. It simply provides a stage when operated without
enter the sprit of the occasion Connect the amplifier's sensible load for the radio's feedback.
by listening on vintage radios. negative or common output to output stage. By looking at Fig. 2, you'll
But we were thwarted by the this point. Take the positive or If the radio has a stereo jack see that the anode current of a
fact that Radio 2 is only live output to the isolated side socket, then use two 22012 pentode is almost independent
broadcast on Band II v.h.f. of the loudspeaker. resistors. Wire one from ring to of anode voltage. Basically,
It's was ironic because this You may be lucky, the set's sleeve and the other from tip to this happens because a
month I had promised to tell internal loudspeaker could be sleeve.
pentode tries to push the same
you how to give radios connected via a plug and Then put another two 22052 current through a load
without v.h.f. capability a new socket arrangement making resistors (wired in series) from whatever its impedance.
lease of life. And there are also the whole operation easy. If ring to tip. Take the audio from Pentodes are said, therefore,
those sets which are too not, cut or unsolder the wire at the junction of these two to have a high output
fragile for daily use yet are a point which will cause least resistors. This gives a crude
impedance.
much more pleasant to listen disturbance to the set. (but effective!) stereo -to -mono
The diagram, Fig. 3, shows
to than modern radios. Take care if you unsolder
the wire at the loudspeaker Fig. 2: Anode characteristics of a pentode (see text).
Valve Sound tag, and use the minimum
amount of heat necessary. The
'Valve sound' in the context of flexible wires leading from the = OV
V9,
vintage radios is a misnomer. connections to the voice coil
The warm, mellow sound assembly can easily come
associated with old sets is adrift if a tag gets too hot.
more a product of the acoustic Vg,. -3V
properties of the loudspeaker External Amplifier
and cabinet than anything to
do with 'valve sound'. The external amplifier should V91- -6V
So, why not drive the older be mains powered and have
set's loudspeaker with a an output power of at least
modern transistor radio? This 10W into an 8i2 load. And I'm
can be done but the results pleased to say that several
are likely to be disappointing. suppliers sell suitable
Furthermore, you could amplifier kits. For example, r.
damage the transistor radio's Maplin's 15W amplifier kit
0 Anode voltage IV)
output stage. The (LT23A) with its matching

44 Practical Wireless, December 1995

the large variation of given, and printed nearby were Fig. 3: Loudspeaker characteristic curve.
impedance with frequency all the important electrode
exhibited by a typical voltages.
loudspeaker. The large peak at None of the voltages I
60Hz marks the bass resonant measured agreed with the
frequency of the loudspeaker. published values. And, a
Above 1kHz the inductance of contrary to what you may
the voice coil begins to expect, most measured high. 1
dominate producing a gradual All the valves were drawing
rise in impedance. less current than they should
Since voltage equals current and so were probably low
times impedance, a constant emission.
8 """--+ Nominal
current drive to a loudspeaker
will produce a voltage curve Low Emission 10
2 3 4 5
100
2 3 4 5
1000
2 3 4 5

similar in shape to the Frequency (Hz)

impedance curve. At lower Low emission also means low
frequencies, (let's say below gain and this was confirmed by reprints are particularly published by BREMA, the
1kHz), audio output will also a lack of strong stations when I welcome. British Radio & Electronic
follow this curve. However, this tuned across the medium Next comes Essential Equipment Manufacturers'
ceases to be true at higher Characteristics (Tubes and Association. (ISBN 0 9517042
waveband. Worse still, the
frequencies. Transistors) originally 0 6)
stations I expected at the low
The natural roll -off of the frequency end of the dial were published by the American And don't forget the
loudspeaker and the capacitor simply not there. company General Electric. Babani reprints I mentioned
(C1) across the transformer The absence of stations at
This more recent book lists last time!
primary will produce a many valves of American
one end of a waveband is
progressive fall in high almost certainly due to the
origin not made by RCA and Valve Holders
frequency output. In addition, local oscillator valve not having therefore are not listed in the
the radio's cabinet will add its RCA manuals mentioned Most, if not all, valve suppliers
enough gain. (This is assuming
own 'colourations' to the audio above. can supply valve holders.
there's no mechanical reason
reproduction. Finally there is the Electron However, they may not be
as to why the oscillator should
The resulting sound may Tube Locator. This is a new able to supply valve holders
stop oscillating).
not be 'high fidelity' but many book more suited to the valve for all the valves they sell.
For instance, at the I.f. end
people find it considerably of each band the vanes of the
collector and historian rather Valve holders for common
more pleasing than the sound tuning capacitor are fully than the valve constructor. bases such as B9A, B7G and
produced by transistor radios! enmeshed. Touching (short- Octal are all readily available.
Finally, one important point, circuiting) vanes can produce My Favourites Those for Mazda Octal, and
don't be tempted to leave the the same lack of stations as a the old American and British
output transformer in circuit. At worn-out valve but without the I think both the RCA manuals four, five and seven pin bases
the very least the sound quality general lack of sensitivity. are excellent and are much are much harder to find.
will be adversely affected. Listen for any tell -tale crackles more than simple data books. It's best to always use new
which can indicate touching Here are some other books valve holders wherever
Melody Maker vanes. which number among my possible. So do try to salvage
Only a new set of valves personal favourites. any uncommon valve holders
Now it's time to look at an old will restore the Cossor to Radio! Radio! (second you may come across.
'favourite', my Cossor 'Melody anything like full performance. edition) by Jonathan Hill The choice of insulating
Maker', model 500AC which is Unfortunately, the Loctal valves (Sunrise Press, ISBN 0 material should be dictated
actually working. And to be it uses are rather rare 9511448 20). This is a very by the application. For
honest, there was very little nowadays and new old -stock readable book about the example you should
wrong with this set apart from examples are expensive. I think development of the domestic preferably use PTFE for low
a thick layer of dust and some it's time to add a set of second- radio set from its beginnings noise audio amplifiers and for
very 'tired' valves. hand valves to my wanted list! through to the arrival of the v.h.f./u.h.f. applications.
The 500AC is a typical five - transistor radio. It boasts Power output valves should
valve mains -only superhet Books for Christmas nearly 1,000 photographs of have ceramic holders unless
covering the long, medium and domestic radios, loudspeakers they are octal based when the
short wavebands. All valves are and valves. common thermoplastic types
Now for some ideas for books
Loctal types, namely: 7S7 for Christmas presents. On
Next is 70 Years of Radio will usually work fine.
(frequency changer), 7B7 (i.f. Tubes and Valves by John W.
page 55 of the August issue of
amplifier), 7C6 (detector and PWthere were details of some Stokes (The Vestal Press Ltd, Closing lime
a.f. amplifier), 7C5 (a.f. output), ISBN 0-911572-27-9). The title
useful valve data books now
7Y4 (full -wave rectifier). tells it all. It's simply essential It's closing time! So, until it's
stocked by the PW Book
After I'd cleaned and Service.
for valve aficionados. my turn 'in the shop' again I'll
checked the chassis I switched The History of the British say cheerio and wish you all a
Two of the books, originally
on. After warming -up the set Radio Valve to 1940 by Keith very Merry Christmas and a
published (in 1959) by The
produced a few weak stations. R. Thrower (MMA prosperous New Year. Please
Radio Corporation of America,
Very good, I thought, but why are the RCA Receiving Tube International Ltd, ISBN 0 keep your letters and E -mails
the low sensitivity? 9520684 0 0), is in a similar coming. You can send your
Manual and the RCA
Remember, a lot of old Transmitting Tubes manual. vein but restricts itself to UK letters to me either via the PW
radios do not have built-in valve development. offices, via E-mail to
Both manuals are
aerials. If you cannot spot a Finally, covering the phil@oldpark.demon.co.uk
comprehensive; each entry
ferrite rod aerial or loop aerial gives details of the base
history of radio and TV or direct to me at 21 Scotts
then connect few feet of wire to manufacture in this country, Green Close, Scotts Green,
connections, heater voltage
the aerial terminal at the rear of there is the excellent book The Dudley, West Midlands
and current and usually the
the set. In some cases an earth valve's maximum ratings. Setmakers by Keith Geddes DY1 2DX.
may help too (but not with and Gordon Bussey. It is
Many entries give
an a.c./d.c. type of receiver). information on actual Late News: National Vintage Communications Fair
I found the circuit of the operating conditions and the There's good news for fans of the National Vintage
Cossor 500AC in the first most popular valve types have Communications Fair. In response to demand from both traders
volume of my Radio and some characteristic curves and visitors alike, organiser Jonathan Hill has agreed to stage a
Television Servicing six - reproduced. Second-hand RCA Christmas Special. It will be held on Sunday, December 3, at the
volume set of books. Base valve manuals are quite rare in National Exhibition Centre, Birmingham. For further details,
connections for the valves were this country and so these telephone Jonathan on (01398) 331532.
II

Practical Wireless, December 1995 45

 IAN POOL E G3YWX

/
JPM:1\if
This month Ian Poole G3YWX
SPECIFICATIONS
takes a look at the mysteries
behind spurious transmitter
signals.

In the Fig. 1 Often the specification is

There are a number of Wanwd =pm!
example it can left rather vague because the
10
parameters which look be seen that the levels of harmonics and other
at different aspects of main signal falls spurious signals will vary
the output from a at a level of - according to the band or
transmitter. Last month I took a 10dB, and the frequency in use. Typically the
look at power output and the Sounimas 0010.1 next strongest levels of harmonics maybe at
ways it can be expressed. signal is levels of -50dBc or even as
However, this is not the eo
at -41dB. This much as -60dBc.
only important specification. 110
Noise
means that the In cases where interference
The 'cleanliness' of the output second signal is is being experienced it may be
70
is also very important. 31dB below the necessary to add a low pass
It's no use having a very
high power transmitter if it
saluodWilitholiairt
10 IS 20 15
main one.
When
filter to an h.f. rig, or a band-
pass filter to a v.h.f. rig. In this
radiates a lot of 'large signals' 0,00uency wale i511.1.1 stating the level way any out -of -band signals
on other frequencies. These of a spurious will be reduced even further as
spurious signals can cause Fig. 1: A typical spectrum analyser plot. signal the levels shown in Fig. 2.
interference to other radio are not normally
users and in the worst case transmitter output will contain given in absolute levels, i.e. a That's all for this time, next
they may even jam vital many unwanted signals. given number of watts or month I'll be taking a look
services. Ideally it would be nice to milliwatts. The more usual way at transmittter
However, the most usual ensure that no power was is to relate them to the level of intermodulation products.
cause of radiating high levels radiated on other frequencies. the wanted signal. Don't forget you can write
of unwanted signals is that Unfortunately this is not In other words a spurious to me via the PW Editorial
interference is caused to the possible. signal will be said to be a offices with your queries.
neighbours' televisions and Filters are therefore used at certain number of decibels
radios. This can be very various stages in the below the carrier.
annoying for them especially if equipment to ensure that any Sometimes this will be
your operating coincides with unwanted signals are reduced referred to as a certain Wanted signal

their favourite programme) in level. number dBc. Low Pass Filter

In the previous response
Unwanted Signals Perfect Filter example the figure could Unwanted
have been given as - harmonics
Unwanted signals arise in a Unfortunately it's not possible 31dBc. The more negative
number of ways. One way they to produce the perfect filter the number is the smaller
arise is from the harmonics and this means that small the spurious signal level.
which are present on any levels of unwanted signals will In other words a spurious
signal. Frequency
always be present. They signal level of -40dBc is
Harmonics are generated however, must be reduced to a better or lower in level
when a signal is passed level where they will not cause Fig. 2a: Action of a low pass
than one of -31dBc.
though an amplifier or mixer. any harm. The method is easy to filter in removing spurious
These circuits will all have To see the levels and use because it's easy to see signals.
some non -linearity (in fact for a frequencies of unwanted the difference between the
mixer it's an absolute signals an instrument called a main signal and the
necessity), and this will result spectrum analyzer is used. spurious signal on a Wanted signal
in some harmonics being Spectrum analysers are spectrum analyser.
generated. Obviously the more normally quite expensive, but Measuring absolute levels Bandpass filter
linear the circuit the lower the they are an essential tool for is not normally quite so - response
levels of the unwanted signals. the radio frequency designer. easy or accurate on an 0 Unwanted
Another type of unwanted In many respects analysers signal Unwanted
signal arises when signals are are similar to an oscilloscope
analyser. aE signal

passed through mixers. Here having a cathode ray tube

sum and difference Ic.r.t.) display. However, Ideal Levels
frequencies will be generated, instead of showing the
Frequency
only one of which will be amplitude of the waveform The ideal level for
required. against time, they show spurious signals would be Fig. 2b: Action of a band-pass
In fact a number of signals amplitude against frequency. zero, however, this is
will be present on the output of Normally the amplitude obviously impossible.
filter in removing spurious
the mixer, including the two axis is logarithmic and Normally transmitters are signals, the unwanted signals are
original signals. All the calibrated in decibels. A typical specified as having all rejected.
unwanted signals must be plot from a spectrum analyzer spurious signals at a level
removed by very 'careful might look like the one shown which is at least 40dB below
filtering' otherwise the in Fig. 1. the carrier or -40dBc. END
46 Practical Wireless, December 1995
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Practical Wireless, December 1995 47

 DAVID BUTLER G4ASR

This month David Butler G4ASR

P(R
takes a look at recent events on the
50MHz band and explains how a
simple callsign cart provide a lot of
geographical information!

The first Sp -E opening Activity From Asia will be very little in the way of DX on may be particularly useful in
recorded this summer on the the 50MHz band for at least six contests.
50MHz band was on 25 April. Activity from Asia was very low this months. All callsigns have a fixed format
After a faltering start the summer. And apart from occasional as allocated by the International
season really got going and from openings to 4K, 4X and 5B4 there Telecommunication Union (ITU). To
mid -May there were almost daily was very little else in the way of DX. Auroral & Meteor Modes this end amateur radio callsigns are
openings lasting well into August. However, for those prepared to made up of one or two characters
In addition to the transatlantic dig them out there were a number of The only activity on 50MHz will be (either two letters or one letter plus
openings to North America and the rare European stations worth produced by auroral openings and one digit), followed by a single digit,
Caribbean (which I've already catching. Among these were C31HK, meteor shower modes. Some auroral then a group of not more than three
reported on) there were openings to HV3SJ, HV4NAC, OHOJFB, T70A, events may be preceded by an S- letters.
Africa and Asia. And of course there T72EB/A, T93M, Z32BU and 4UOITU. layer type opening approximately 24 The initial one or two characters,
was activity from the rarer parts of A number of stations from hours earlier. This is termed a pre - called the prefix, denote the country
Europe also. eastern Europe were also active auroral enhancement. to which the amateur station
An area of Africa that isn't heard including US2YW/P, UT5A0, UT6X, So, if you note an unusual belongs. For example, ES is Estonia,
much is Western Sahara. But at the UTBAL, UU8JJ, UXOFF, UX1MF and opening on 50MHz don't forget to EU is Belarus and EJ is the Irish
end of May Tim KCOPA became QRV UY5ZZ. It's not known if all had look for an aurora the following Republic. (The latter Irish prefix is
on the 50MHz band (and h.f.) for a permits for 50MHz however! evening. (Don't miss out!). used for offshore islands).
period of ten weeks. Unfortunately there were also a Although Sp -E openings can It's all 'standard stuff' to the HF
Originally Tim used the callsign number of pirate stations active on occur during the winter, these DXer. So should it be for you too!
SO/KCOPA but was advised by the the 50MHz band during the summer. events are generally few and tar Apart from identifying the ITU
ARRL DXCC Desk that they would So if you worked TF5CW, TZ6VV, between. Last year the band was country the prefix can also indicate
have great difficulty in approving his 3V8BB, 5R8DG and 7X2CR don't open on twelve days between 27 special authorisation. For example,
operation with the SO call. However, waste your time and money sending December and 20 January. an EH station is simply a Spanish
they advised that if he obtained for QSL cards. The winter Sp -E openings are operator with a 50MHz permit. When
permission from the UN commander normally quite weak and the m.u.f. the station operates on other bands
and used the call sign 4U/KCOPA his doesn't rise much above 60MHz or he/she reverts to the EA prefix.
operation would be approved. Sporadic Openings so. However, there's always the If you hear an EB station on the
exception and openings have been 144MHz band it indicates a Spanish
A number of operators have still noted on the 144MHz band in the v.h.f. class. The prefix may also
Advice Followed been reporting that Sp -E openings winter but these are fairly rare. indicate a certain type of station.
are occurring the 50MHz band. (By It's also possible that the You'll be familiar with a GB
The ARRL advice was duly followed the time you read this though that transatlantic path to North America callsign which indicates a special
and by the end of June Tim had propagation mode will have can open up on the 50MHz band. But event station within the UK. But what
worked over 25 countries on the disappeared.) The last opening I again this is not normally expected. about GC, GH, GP and GT? Just to
50MHz band. He was using an Icom noted (I'm writing this on October 1) During the years around the peak put you out of your misery these are
IC -551D running BOW into a 3 - was on September 17. of the solar cycle the period club stations in Wales, Jersey,
element Yagi from locator IL46. (Any John Edwards GM7NVA (1085) between November to March Guernsey and the Isle of Man
QSL cards go via Tim's manager reports catching a Sp -E opening on produces some of the best DX respectively.
VE9RHS). September 7. Between 1900- conditions known. We've a few
Surprisingly, a number of other 1945UTC he worked stations in HB9, years to wait before F2 -layer
stations, SORASD, SO1MZ and I, OE, SP, YU1 and 9A. John, using propagation returns but when it does Geographical Area
SO7URE also appeared on the band 25W and a 6 -element Yagi, also you'll certainly know about it. The
during the summer. The good news is heard the CT and ZB beacons but band will literally be open world- Sometimes the single digit following
that the club station SORASD (IL56) despite calling for some time no wide to all continents. the prefix can denote the
now has a resident operator so it will further contacts were made. geographical area or region. For
be QRV all year round. (QSL cards for There were a number of Sp -E example, an SM7 station is located
this station go via EA2JG and those openings on September 16 with Callsign Recognition in the southern part of Sweden
for SO7URE go via the Spanish European stations being reported on whereas an SM2 will be in the
Society EA4URE). the band as early as 0730UTC. The Interestingly, the release of the northern tip of Sweden. (Well worth
Another African 50MHz operator, main events occurred between 0930- 50MHz band to many countries knowing in an auroral opening!).
Eric 5T5JC has been active from 1100UTC, 1410-143OUTC and 1500- within Europe and beyond has Similarly an EA3 station is
Mauritania (IL30) for the last two 1615UTC. brought with it the attendant situated in the Barcelona area of
years but went QRT in August. The openings in the morning problem of callsign recognition on a Spain whereas an EA6 is in the
Fortunately he has passed his gave contacts with stations in OE, world-wide basis. Balearic Islands, both of these being
equipment on to 5T5BN (1K28) so look SP, S5,YU and 9A. Propagation in the Apart from confirming what in Europe. However, an EA8 (Canary
out for this new station next summer. afternoon was to the south with country a certain callsign is Islands) or EA9 (Ceuta and Melilla)
Other African stations to appear contacts being made with CT, EA, allocated to, familiarity with the station are both located in the
this year in UK log books have EA6, F and ISO. callsign structure can be very African continent. All within Sp -E
included CN2JA, CN8NS, CT3FT, As I mentioned earlier the helpful. It will enable you to range of the UK on the 50MHz and
D44BC and Others included incidence of Sp -E propagation will eliminate obvious mistakes when 144MHz bands.
EH8ACW, EH8BPX, EH9IB, EH9IE, now be non existent. Therefore, at working with weak or partly The single digit can also indicate
EH9RY and 5T6E. this stage of the solar cycle, there unintelligible stations. This practice the licence class or other special

48 Practical Wireless, December 1995

 Don't get lost in the 'YIN oVS6FX K4 "
intricate world of amateur - *F13094
radio callsigns and prefixes. Y2 BZD LU6HOS 11(6"
Just follow G4ASR's useful US r6AL, DU1MRC
guide in 'VHF Report' this l'
All111k1
VT13-
month and you'll identify 914168E zotavx
that mystery station!
NAM
Mir KP2A
SIVISPU

EL2AV

MU
. lU3DCA # t-7,-
VP
PY RI. ""ii K8
LU88F
authorisation. For example a G7 elltrPvesJ

holds a B licence allowing operation A 1 PY2TTN,

on all bands from 50MHz and up, an
ON8 is a foreign amateur in Belgium 10DV WB9CA5 PYIAQ D 1

and an OKO is a repeater in the Czech NIDB

Republic.
Stations on the east coast of
England might occasionally hear a
PDO callsign. Believe or not this
indicates a Dutch operator with a D
class licence authorising operation
on the 144MHz band.
Dutch Class Ds can use f.m. only, W2CAP/1. These indicate from which gleaned? The answer is yes. Another DXer you need always to use the
on crystal controlled channels S10, geographical part or region of the specialist list indicates that the first grapevine for both technical and
511, S13, S14, S15, S16. They're country a station (normally portable) letter in the suffix, 'U', means the operating information. So...listen and
permitted to a maximum of 25W d.c. is operating from. And of course you station is located in Kiev. learn!
input! can also get a combination of both Furthermore it shows that the last
types as depicted by TF/G4AFJ/M or two letters 'VA' are allocated to club
LA/DL7YS/P. stations. Deadline Time
The Suffix By using other maps it can be
shown that Kiev is in locator K050 It's deadline time again. And if
So much for the prefix and digit, now Invaluable Information and oblast 065. (Each administrative you've made any DX QSOs recently
what about the 'back half' of the region is assigned a three digit or just wish to pass on any news
callsign, or suffix as it's known? From the example I've provided it number, commonly called the oblast please let me know about it.
Surprisingly perhaps, this can also should be apparent that in many number. This is frequently used for As usual send details (to reach
provide information. cases the callsign can provide award purposes.) me by the end of the month) to: Yew
In Hungary, for example, the first invaluable geographical information. So, from just a single callsign I Tree Cottage, Lower Maescoed,
letter after the call number indicates By using this knowledge and cross can ascertain that I was listening to Herefordshire HR2 OHP You can
the geographical area or region. Also referencing with locator maps you a Ukrainian radio club situated in also contact me via packet radio <=

in Hungary land in the Czech can eliminate many impossible Kiev. It was in oblast 065, locator GB7MAD, the DX cluster GB7DXC
Republic) the letter K indicates a club combinations of callsign and locator. square K050, on a bearing of 81° and or the Internet
station. In a number of instances it's 2350km away. davebu@mdlhrl.igw.bt.co.uk
A suffix can also indicate the possible to identify a specific locator Alternatively you can telephone me
licence class. An obscure example is square from the callsign alone. on (018731860679
an Icelandic station with a single Although you cannot, and should not, Intricate Systems
serial letter callsign le.g. TF3A). This work backwards from a locator
indicates that the operator has been square to a complete callsign, it may Obviously, instant recall of the
licenced for 25 years and holds a be possible to eliminate certain world's intricate callsign systems
500W C class licence! callsign groupings if initially only the doesn't come easy. Fortunately,
locator information is received specialist operating manuals are
correctly. available that catalogue most of the
Separated Solidus For instance, you may have information that you'll require.
partially received the callsign ???HBR One problem with the books is
Sometimes it's possible for a callsign and the locator JN6OXS. Checking the that callsign systems are for ever
to have a prefix which is separated locator map indicates that the station changing throughout the world. So
from the rest of the callsign by a is located on the Isle de Ischia. it's therefore impossible to keep
solidus (/). For example some recent Instantly you recall that islands books right up-to-date.
v.h.f. expeditions have included situated off the coast of Italy in this The only way to keep up-to-date
CT/G3SDL, ID9/12AE and TF/G4DHF. area have calls prefixed with IC8*. with changes in operational
This indicates temporary operation in That's our station - must be IC8HBR. procedures, or for learning about the
another country. Except that you still need to hear him latest DXpeditions is to haunt the
A suffix may also be separated say "IC8" to the satisfaction of your bands. Swop news with other DXers
from the rest of the callsign, for own conscience! "Dave obviously got and listen a lot!
example: ES8RJ/8, I2ADN/8 or top marks in geography! Editor. Access to the DX Cluster and
As I've just explained you can information groups on the Internet
sometimes deduce a large amount of are also a mine of information.
References (useful Books)
information just from a single callsign. Monthly newsletters are a good way
RSGB Prefix Guide Let's suppose I heard UT5UYA calling to learn about events fairly quickly
RSGB Amateur Radio Call Book CO on the 144MHz band. Reference to after they have happened, but the
RSGB Amateur Radio Operatina a list of ITU allocations shows that deadlines for the v.h.f. columns in
Manual stations in the block URA-UZZ are monthly magazines are simply too
ARM. Operating Manual located in the Ukraine. long for late breaking news.
Is there more information to be In other words to be a successful END
Practical Wireless, December 1995 49
 LEIGHTON SMART GWOLBI

Leighton Smart GWOLBI provides his

usual fascinating round -up on hi-.
band activity and introduces more
keen reporters.

September's reports yet again 2212, and club station GXOBRC/P at

indicate that conditions on 2032, while his 3.5MHz log includes
the h.f. bands have been Novice station 2EOAIZ, Tom in
relatively poor. Certainly, Cambridgeshire at 2209, and
during the daytime very little of DL2SWK/P Germany at 2008UTC.
interest has been heard here;
although the late afternoon and The 7MHz Band
evening has tended to provide some
good openings to certain parts of the The 7MHz band has been very Don's vast log lists amongst G5RV antenna.
world. productive again this month. And others HI8FCR (Dominican Republic) Last but not least for this band
However, conditions should first of all it's over to early bird Ted at 2315UTC (QSL via Box 25226 Santa comes Gordon Foote G7NCR in
improve as winter approaches, Trowel! G2HKU on the Isle of Domingo, Dom. Rep.), HSO/G3NOM Bristol. He uses a Howes DcRx
particularly on the higher frequency Sheppey. Ted, using a Ten Tec Omni (Thailand) at 1625, (fast QSL route via single band receiver and a loft
bands. And 28MHz is still showing Vat 70W and a G5RV dipole worked GOCMM), N7QXQ/HR6 (Roatan mounted receive antenna.
signs of life, albeit via Sporadic 'E' (all c.w.) listed contacts with Island) at 2222, V51B0 (Namibia) at Gordon reports s.s.b. reception
propagation, but the long standing VP2MDE (Montserrat), RK9XWH 1752, (QSL via Box 1823, Tsumeb) of the Flatholm Island joint
problem of lack of occupancy is still (Asiatic Russia), KG9N/C6A (in the XROY (Easter Island) at 1509 (QSL via expedition between Barry RS and
very obvious! Bahamas), ZL2AGY (New Zealand), WA3HUP) and 5H3MZ (Tanzania) at the Bavarian RS (IOTA EU 124) to
And while on the subject of '10 and IA5/1K4DCT (Toscano 1908 (QSL via Box 174 Malindi, commemorate Marconi's first
metres', I've received a letter about Archipelago) all at around 000UTC. Kenya). Don uses a Kenwood TS -950 experiments in 'radio across water'
the band. It suggests that 'B' Like Ted, another 7MHz early bird rig and a TET HB33SP beam antenna. in 1897. He reports GB5FI working
licensees should be granted access is Charlie Blake RS96034 in Milton There's a change of mode this CN8MC (Morocco), CT3FT (Madeira
to 28MHz. Keynes who reports s.s.b. reception month for s.w.l. David Henry of Island), W7HUY USA, VE6JFW
If Class Bs were allowed use of of ZL2BCG (New Zealand) in QS0 Aberdeen, who has been logging (Canada), RV3DB (Russia), G4SQA,
28MHz, with limited power output, with GOAOR at 0540, XEVIC (Mexico) RTTY contacts using a Trio R1000 OD5VT (Lebanon) and YO9CSM
they could increase band in contact with OM2DX (Slovak receiver and a 20m long wire (Romania).
occupancy. The letter suggests Republic) at 0534, CP6DA (Bolivia) antenna. David mentions reception
(hopefully) access could ensure that working LA2PA (Norway) at 0609, of W1CX (USA) at 2221UTC, E050FI 18 & 21MHz Bands
the band remains part of the amateur DJ2HY (Germany) in contact with (Ukraine Republic) at 1420, OD5PL
radio allocation, and out of the hands GOEKD at 0616, SP2CCO(Polandl (Lebanon) at 1808, and VA3MM Finally, a quick look at the 18 and
of the 'use it or lose it' brigade. working G3DPW at 0551UTC. (Canada) calling 'CQ Asia' at 21MHz bands now, as space is
And if the DTI were ever to Charlie also logged CE1RYJ 2251UTC. limited this month. Don G3NOF has
change their policy on conversion of (Chile) in QSO with F5OYT (France) at Now it's over to new reporter made 18MHz s.s.b. contacts with
26/27MHz multi -mode rigs, this 0540, and M100G, an English special Brian Waddell GM4XQJ from Falkirk. CO7KR (Cuba), J73VE (Dominica) at
would also take a great number of event station celebrating 100 years Brian says that it's time for 1947, (QSL: N4SPQ(, PJ8AD (Leeward
currently illegal sets out of of radio, located 60km north west of mandatory bandplans after suffering Islands) at 1202, (often heard at this
circulation, and onto the increasingly London, received at 1155UTC, all immense ORM from PACTOR on the time on 18.136MHz) and TJ1AD
occupied 28MHz band. This seems a were heard by using an NRD 525 14.060MHz QRP frequency! (Cameroun) at 1811UTC.
viable solution to me. What do you receiver and an llm sloping wire Brian lists GRP contacts with Ted G2HKU lists his 21MHz
think? antenna for reception. K1JKS (USA), 3D2PN (Fiji), SV2DGZ contacts with K2LE and N3AD (both
John G3BDQ has been busy here (Greece), and FY5YE (French Guiana) USA). They were both around mid-
on 7MHz in mid evening, listing c.w.
The Low Bands on c.w., and AP2TM (Pakistan). He day, using an HF 6 vertical antenna.
DX contacts with 4S7ZAG (Sri Lanka) also listed FM5GX (Reunion Island),
at 2127UTC, JG3TRB(Japan) and a 3V8B8 (Tunisia), and ZC4C (British Thanks Again
On to your reports now, and I'll start
host of other Japanese stations bases on Cyprus) on QRP s.s.b.
off with the low bands with John
around 2100, VK2KM (Australia) at Another new correspondent is Well, that's it for this month. My
Heys G3BDQ near Hastings. And
2120, VU2PAI (India) at 2029, PTA/JD Chris Brown GOUNJ in Manchester, thanks again to all our reporters for
John starts off by saying that the
(Brazil) at 2102, and 9Q5MR (Zaire) at using a Yaesu FT -107S and a home- their time and effort which makes
new sunspot cycle has started at
2119UTC.
last! About time too, eh John? brew quarter -wave vertical for this column what it is.
Using a 60m long end -fed wire 14MHz. Chris reports s.s.b. contacts However, I am desperate for
mounted at 13m above ground on The 14MHz Band with ET3SID (Ethiopia) at 1803UTC, photographs of yourselves to make
1.8MHz John reports working s.s.b. DU9RG (Phillipine Islands) at the column prettier! So please send
with LY3NCI (Lithuania) at 2006UTC, I'll begin the 14MHz band section 1252UTC, and 5X4FI (Uganda) at them in.
9HODX (Malta) at 2104, as well as with long time correspondent Don 1840, despite this...Chris says the Reports and information by the
Scottish and Irish stations and other Mclean G3NOF in Yeovil. Don's bands were in poor shape! 15th of each month to Leighton
Europeans. monthly propagation report indicates Now it's down to Skewen in West Smart GWOLBI, 33 Nant Gwyn,
Meanwhile, 'QRP man' Eric that daytime conditions have been Glamorgan and Carl Mason Trelewis, Mid Glamorgan, Wales
Masters GOKRT in Surrey has been generally poor; the short path to Asia GWOVSW. Carl reports 100W CF46 6DB. Tel: (014431411459.
using his QRP Plus 5W rig and a 26m on 14MHz has often been open at contacts with VE3JPN (Canada) at (Please mark your envelope 'HF Far
end -fed wire antenna to work around 1500UTC onwards, with 1812, N4REL (USA) at 1441, SV1BJL & Wide')
1.8MHz low power s.s.b. contacts. African stations coming in at around (Greece) at 0408, and XK3FH
He contacted 640SY in Croydon at 1700. (Canada) at 1228UTC using a simple

50 Practical Wireless, December 1995

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52 Practical Wireless, December 1995

 PETER SHORE

ROUND -UP
Peter Shore brings you the latest
news from the world of
international broadcasting.

Deutsche Welle (DWI has in the Thai language. The station has
once again had to stop said that a majority of people listen
operations at its relay station
in Sri Lanka because of eteditiGS New to the BBC World Service and Voice
of America's Thai services, and that
security problems in the region of
Trincomalee where the station is
sited. Fighting has flared up regularly
wne those who want to tune to Australia
prefer the station's English services.

since the breakdown in April of the That's the end of this month's
cease-fire agreement between the summary of the world of
government and rebel Tamil Tigers. international radio. If you log
The Sri Lankan army is patrolling anything interesting, or hear any
the DW station's perimeter to prevent snippets of news that might interest
damage to the installation, while the fellow PW listeners, please drop
staff are staying in Colombo, the me a line via the Editorial offices in
country's capital. The winter Broadstone. Until next time, good
schedules came into effect at the listening!
end of September, at the same time
as the continental European clock
changes.
As a result, many frequencies
and programme times changed in the
world of international radio. Here is a
summary of what's happened around
the bands.
and to North America at 0000-0100
and 0500-0600UTC on 7.48 and
9.70MHz.
There is also a transmission to
Asia at 1230-1330 on 9.81 and
to take advantage of Astra's new
Digital Radio (ADR) service. If you
want to tune in to the new digital
service - which offers sound
approaching CD quality - you will
ORF
Programme Schedules 11.605MHz. Radio Bulgaria can be need to buy a new black box, and
reached at 4 Dragan Tsankov those are currently in short supply in
Radio New Zealand (RNZI) in English Boulevard, Sofia 1040, Bulgaria, or the UK and continental Europe. A
can be heard at 1850 to 2215 on by FAX on +359 2 650 560. number of other international
11.735; from 2216 to 0457 on 15.115; The Voice of Vietnam in Hanoi, broadcasters are likely to take up
0458 to 0715 on 11.90 and from 0716 which celebrates its 50th capacity on ADR once the service
to 1206 closedown on 9.70MHz. The anniversary this year, has moved to has gained acceptance from
station re -opens at 1650 on 5.96 and its regular winter frequency of consumers.
changes frequency again at 1850 to 12.02MHz which includes the
11.735MHz. European services at 1130 (to Radio Norway
The RNZI station carries the Eastern Russia), 1330, 1600, 1800,
1100UTC BBC World Service
Newsdesk on 9.70MHz. All
1900 and 2030. Contact the Voice of
Vietnam at 58 Quan Su Street, Hanoi,
Radio Norway International
continues to transmit English on
RADIO
programmes are carried on a 100kW Vietnam or FAX on +84 4 261122. Sundays. Tune in at 0700 on 7.18, 1300 AUSTRIA
transmitter at Rangitaiki in the North Radio Damascus has English for on 7.315, 9.59 and 15.605; 1400 on
Island. listeners in Europe at 2005 until 2100 11.84, 1500 on 9.52 and 11.73; 1900 on INTERNATIONAL
The programme Mailbox on on 15.095MHz, and to Australasia 5.96, 6.195, 7.485, 9.59MHz short wave
Monday is on at 0430, Thursday at and America at 2105-2205 on 12.085 and 1314 kHz medium wave; 2200 on
0830 and Friday at 193OUTC and and 15.095MHz. 6.17 and 6.195 and on Monday
includes Arthur Cushen's regular DX Listeners to 5.875 and 9.605MHz (Sunday in the target zone) at 0100 on
information, as well as answering on a Sunday in September might 6.01 and 0300 on 6.03MHz.
listeners' letters. Letters can be sent have been surprised to hear a live From neighbouring Sweden,
to RNZI, PO Box 123, Wellington, commentary of the Bank of Ireland English can be heard at 1715 on 6.065,
New Zealand, or FAXed to +64 4 4741 Gaelic football final. An organisation at 1830 on 6.065, 7.24 and 9.655; 2130
433. If you are connected to E-mail, called Irish Overseas Broadcasting on 6.065 and 7.23 and 2230 on
write to rnzi@actrix.gen.nz, and find (10B) Limited worked with RTE to 6.065MHz. All these transmissions are
the station on the World Wide Web a hire BBC transmitters at Skelton in also carried on medium wave on
http://www.actrix.gen.nz/users/rnzi Cumbria and Woofferton in 1179kHz (and there is a medium
Radio Singapore International Shropshire to relay the match. The wave -only transmission at 2330UTC).
has English to Asia at 1100 to 10B asked for reception reports to The station has a new site on the
1400UTC on 9.53MHz daily. You can be sent to PO Box 4950, Dublin 1, World Wide Web: http://www.sr.se/rs
dial in for the latest frequency Eire.
information on +65 353 5300 and FAX Radio Australia
the station on +65 259 1380. Digital Radio Service
Radio Bulgaria has English to Radio Australia, which is in the
Europe at 2000-2100 on 7.335 and 9.70 Radio Austria International is one of middle of a government review of its
and at 2200-2300 on 7.105 and 9.70, the first international broadcasters operations, has stopped broadcasts
END
Practical Wireless, December 1995 53
 MIKE R I C H A R D S G4WNC

- COMPUTING
B S&b
Mike Richards G4WNC rounds -up
ES IN RADIO
the latest news from the computing
in radio world.

Despite various pleas, it can draw its text from a disk file kaI NuMorse 1.30e SourceiC114M1301RESPONSE.TXT] LAN
appears that no one has or the keyboard. lie Ohl search may settings virtput nes/Ices venerate Mtn wmaow help
managed to get the PSA One of the most powerful WA) [d.liagithabbj 12E12 jk loll I
DSP programs to work features of the NuMorse tutor is
MORSE PLAY
with the SoundBlaster AWE32 its drill modes. Here the program
board. Stan White has tried, but analyses your responses and will
without success. If you know adjust the speed and message
different, please drop me line. content to coach you on your
weak areas. Closely associated
with this is the program's ability
Windows '95 to produce statistics showing
your performance in response to 11 I I 1,1!
I'm still waiting to find enough the tests. 1,1
space on my hard drive to run the You can also set a range of
latest Windows '95 release. The filters to determine the
reports I have so far look good. characters that are included
I've even seen one report within the random groups. This
from David Moisan in the States feature can be supplemented by
indicating that you can run adding a weighting to certain
HAMCOMM and JVFAX characters so that they are sent GRAFT IX 4.1
successfully under Windows '95. more frequently. Shareware
tritiorir Casevisue INS 1, Lew
I'd be pleased to hear from any NuMorse is also extremely
readers who can confirm this. flexible in the way in which the The NuMorse program makes excellent use of the Windows
tones are sounded. While you graphical interface to produce a very friendly easy to use
can use the PC's internal program.
NuMorse Update speaker, the preferred option is
to use a SoundBlaster G4BVX could be a great help. answer in cases where you were
Great news for all those compatible system. If you do this, The Lucid RAE program is a wrong.
sweating over the Morse test. not only do you get a better class rather novel application that In fact, some simple
Tony Lacy of NuMorse fame has of tone, but you can use provides an on-line tutorial so programming ought to be able to
just sent me the latest update of NuMorse's speech output as you can swot -up whilst playing capture the student's weak
this popular Windows based well. with your PC! The program areas, link with the tutor program
tutor. In addition to providing status centres around the use of and customise the lessons to
The NuMorse program information, the speech option separate text files for each of the focus on the weak areas. One
makes excellent use of the can be configured to give voice main topics that are selected final request for future releases
Windows graphical interface to announcement of each from a menu system within the would be to replace the awful
produce a very friendly easy to character. So, how do you get a main program. pink background with something
use program. To ensure that you copy of the great tutor - you can Once a topic has been a little more tasteful!
learn the proper rhythm of the either order Disk 3 from my selected you can then scroll If you would like to try the
code NuMorse uses what's readers offers at the end of the around to find the text you want. Lucid RAE tutor, a demo copy can
known as Farnsworth coding for column, or you can contact Tony The only snag with this part of be obtained from the author G.W.
sending at the slower speeds. directly at 58 Bilbrook Road, the program was the slow Butler, 18 Hobart Road,
With the Farnsworth system Codsall, Wolverhampton WV8 reaction of the text viewer used. Ramsgate, Kent CT12 6NW
a slow overall sending speed is 1ER. Whilst it was okay if you Please send an s.a.e. plus high
achieved by stretching the gaps The price for a registered wanted to read through from the density IBM formatted 3.5in disk.
between characters and words copy of NuMorse is £20. If you start, it was painfully slow if you If you want a full, registered,
rather than spoiling the sound of have CompuServe access you wanted to skip through to a sub- version of the software you will
each character. For the UK test can register your shareware section. However, all was not also need to send a
you would therefore set the version via on-line shareware lost as you could always use the cheque/postal order for £17.50.
character speed to 12w.p.m. and registration (GO SWREG). When Windows Notebook to directly My thanks to G. Butler for
the program then stretches -out using this system the NuMorse view the text files. supplying the review software.
the gaps to give the required registration ID is 1721. My thanks Included with the Lucid tutor
overall speed. to Tony for kindly supplying the was an RAE examiner. This was a
By using the Farnsworth review software. simple package that produced Internet News
technique your ear becomes 100 RAE multiple choice
accustomed to the sound of the questions that could be used to The hot Internet news is the
12w.p.m. code and as you New RAE Tutor check your progress. latest version of Netscape
become more proficient you just Although there were one or Navigator. This popular WWW
cut down the thinking time Yet more Windows software! Are two minor mistakes in the review browser has gained a very
between characters. As well as you trying for your Radio copy, it was a very neat idea. For strong position among Internet
providing straightforward random Amateur's Exam? If so, the new future releases it would be great users due to its wide range of
streams of characters, NuMorse Lucid RAE tutorial from G. Butler if the program told you the right advanced WWW features.

54 Practical Wireless, December 1995

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IBM PC Software (1.44Mb disks): get any documentation about
Disk 1 (Order Code DK1I - JVFAX 7.0, HAMCOMM 3.0 and WEFAX 3.0 MSDOS with it.

Disk 2 (Order Code 01(2) - DSP Starter plus Texas device selection
software.
Disk 3 (Order Code DK3) - Ultrapak 2.1 and NuMorse
Disk 4 (Order Code DK4) - Mscan 1.3 and 2.0

Printed Literature:
Beginners Utility Frequency List (Order Code BL)

The latest version (2.01 is a Complex Signals Utility Frequency List (Order Code AL)
major development that Decode Utility Frequency List (Order Code DL)
transforms Netscape into a
complete Internet tool. Up until FactPack 1 Solving Computer Interference Problems (Order Code FP1)
now most Net users have had to FactPack 2 Decoding Accessories (Order Code FP2)
accumulate an assortment of
applications, i.e. FTP, mail, WWW FactPack 3 Starting Utility Decoding (Order Code FP3)
browser, etc. Netscape FactPack 4 JVFAX and HAMCOMM Primer (Order Code FP4)
Navigator 2.0 is supplied as a
complete suite of integrated FactPack 5 On the Air with JVFAX and HAMCOMM (Order Code FP5) The book Getting
applications all ready for action. FactPack 6 Internet Starter (Order Code FP6) The Most From Your
Among the enhancements to
PC's Hard Disk. (BP280)
the Web browser are support for
simultaneous streaming of video, by J. W. Penfold takes
For the printed literature just send a self addressed sticky label plus 50p
audio and other data. This means you through the rigours
per item (£1.50 for four, £2.50 for 7 and £3.00 for 91. For software send£1.00
that you can listen to audio and
per disk (£1.75 for 2, £2.50 for 3 or £3.00 for all 4) and a self addressed
of fitting and preparing a
watch pictures as they build-up hard disk. Then follow
rather than have to wait until all sticky label (don't forget I provide the disk!).
the data has been transferred.
three chapters showing
To cover your E-mail you how to organise
requirements Netscape 2.0 your data and keep it
includes a full mail program so secure.
all my special offer programs Audio Switch Box
that you can both send and
have been supplied in their own
receive mail using Netscape's
built-in security systems. News is
sub -directories. The reason for Dave Dyngley has sent me an E- The book about
doing this is to allow me to put mail asking if I know of a switch your new PC is: How To
another area that features in the
several programs on one disk box that can be used with a
new release with a complete
without mixing -up all the files!
Expand Modernise And
application that allows the user transceiver to provide switching
If you're unsure of how to Repair PCs And
to read, sort and post messages between microphone and data
access sub -directories, here's a system. Dave's current system Compatibles (BP271) by
to newgroups.
few tips. If you're running in MS- uses the Commslab RSD116 R. A. Penfold. This book
The newsgroup messages
DOS, first insert the readers disk interface and HAMCOMM and is aimed at those who
can be displayed fully threaded
in drive A and type A: to log on to JVFAX programs.
to make it easy to follow a
that drive. Next type DIR to show have an older or simpler
complete topic without having to Other than building one
the content of the root directory. yourself, I'm not aware of any machine. Those who
jump about. The security features
of Netscape are very good and
If you're doing this on my Disk 1 ready built switch boxes. would like to add other
you will get the following display: However, if you know different bits to their machines.
employs a 40bit key that, at the
last count, took a considerable please write and let me know.
computing effort to break. There HAMLLIMM <DIR>
is talk that this could be JVFAX <DIR> That's it for this month, so until See the PWBook Service
enhanced to 64bit if the US WXFAX <DIR> next time keep computing and pages for more details of these
export laws are amended. sending your letters to me Mike two books for your stocking.
In addition to these basic, but Richards G4WNC, 'Bits & Bytes',
To switch to the JVFAX directory
vital upgrades, the new PO Box 1863, Ringwood, Hants
all you have to do is type
Netscape Navigator has been BH24 3ZD. CompuServe:
CD \JVFAX. If you type DIR again
designed to make life easier for 100411,3444; Internet:
you will then see the program mike.richards'atbcnc.org.uk
Internet developers. For more
files thus:
information contact Netscape at
http://home.netscape.corn/
DIR
.DIR
Disk Diresctories INSJV70.EXE
1:)rt)r) ME
Over the past couple of months
I've had a few of my readers'
offers disks returned with a note For more details either check-out
saying the files are empty. Each your MS-DOS manual or look out
time I've checked the disks, all for a good basic computing book
appears to be fine. such as PCs Made Easy
The problem appears to be a (available from the PW Book
lack of understanding of disk Service for £15.95 plus f1 P&P
directories. For some time now (UK), £1.75 P&P (overseas).

Practical Wireless, December 1995 55

 Andy Emmerson G8PTH reports on
an ATV contact which took place
between the UK and the
Netherlands during August.

just one report this time, but Bob's transmitter

what a report! It concerns a was a DRO-stabilised
spectacular contact, or rather affair producing
set of contacts, between the 900mW on 10.278GHz
UK and the Netherlands. into a 1m prime focus
Nothing spectacular in that, I dish. His receiver was
hear you say, except that this was a converted satellite
with P5 pictures on lOGHz and LNB and home-brew
without a lift! In fact it may change electronics.
your whole perception of the lOGHz For his part, Hans
band and its possibilities. Why waste had a similar receiver
time struggling with expensive and 250mW of transmit
power devices on 430 and 1270MHz power on 10.4GHz to a
when you can achieve perfect 750mm dish. Several
contacts on 106Hz with flea power? other amateurs joined A very exuberant -looking Hans faces the camera (almost) as he
There's got to be a catch and in the C1S0 on the Dutch
celebrates his flea -power feat sending P5 signals across the North Sea
yes, there is if you want to see it that side, including PAOVHF
way. But just as a bottle can be and PAOBOJ.
on 'I OGHz... without a lift!
either half -full or half -empty,
depending on your viewpoint, I think
the opportunities presented on the Surface Ducting although he fears the results will working and loop -back (with Bob re-
lOGHz band are the most exciting prove contact impossible. "This is transmitting Han's signals to
thing I've heard in ages. See for Bob G8OZP says signals in both real amateur radio", says Bob. "The Walcheren). The path was 145km or
yourself anyway...! directions were absolutely rock - theory may be well known but at 290km for the round trip.
The catch. Oh yes, the catch. steady P5, exploiting the propagation least we were able to prove it in a Needless to say all this was
Well, you need an over -water path mode of sea surface ducting. It practical and very real manner". achieved with P5 signals and no
but it can be a lengthy path. appears that the signal is launched problems. Operation was also tried
Then, if conditions are right (and into a layer of air just above the on 1270MHz, with Bob sending 15W.
remember, you don't need a tropo surface of the water, the duct is QRP Experimenters Results were nowhere near as good
opening, merely calm weather) then formed by the changing air density as lOGHz, with signals of P3 to P5
you too could work international DX caused by water vapour just above To provide a bit of variety Bob and strength and much fading.
over paths up to 300km or more. Is the sea. Hans also tried out some QRP You might be thinking that
this special pleading? I think not. Signals enter this duct, graze experiments. Bob brought along a working AN from the UK to the
the sea surface and are refracted 10mW Gunn diode transmitter that Netherlands on lOGHz was a first...
back into the duct, rather like the he makes available as a kit, together but it's not. In fact it's interesting to
August Event action of a stone skimming on water. with the prototype of a new kit -built note this was achieved by Paul
The height of the duct is not very receiver. G8IXE and Ken G4ALN back in the
The actual contacts were made over great. Bob is making available kits of late 1970s. Exactly how, and where
the weekend of August 19120 this Bob and Hans noted that parts for his equipment designs; the from and to, I must investigate, also
year (and were set-up by letter a passing ships interrupted their Gunnmod 2 transmitter costs just £20 whether they too exploited sea -level
couple of weeks beforehand). But signals and in the end they could or £30 with a pre -tuned Gunn propagation.
the genesis of the idea goes back to predict visually when their signals oscillator, whilst the receiver will The sea -level technique also
meetings at several BATC would be lost due to action at sea. work out around £65. For details works at lower frequencies,
conventions. This proves that ducting is not send an s.a.e. to Bob Platts G8OZP, although possibly not so effectively
The convention is where Bob taking place in the upper 220 Rolleston Road, Burton on Trent, owing to the longer wavelengths. I
G8OZP met Hans Dekker PE1ECO atmosphere. Height, which is Staffs DE13 OAY. recall French amateurs used to
and his colleagues who visit our ATV normally an advantage in v.h.f. and Solid P5 pictures were achieved transmit 430MHz pictures to us Brits
meetings regularly. They conceived u.h.f. work, is in fact of no help with even at this low power level! "By from the dunes at Dunkirk with great
the idea of trying AN on 106Hz the duct mode of propagation. Bob Sunday afternoon we were running success. Perhaps they still do but
across the North Sea under normal also worked PE1DCD/P stationed out of new things to do", continues we haven't had any reports of this.
conditions. atop sand dunes at the Hook of Bob, "so just for fun I removed the
The hook-up in August involved Holland and the received signals dish antenna and pointed the That's all I've got time and room for
Bob, located on the sea front at were noticeably noisier despite waveguide feed alone towards this time so cheerio for now. Keep
Aldeburgh, Suffolk and Hans, who similar transmit power over there. Holland. Amazingly Hans could still your letters coming to me at 71
was on the foreshore at the north- Signal levels were remarkably receive my pictures at strengths Falcutt Way, Northampton NN2 8PH.
west tip of Walcheren, the most constant over the weekend. Tests from PO to P5, albeit with heavy
westerly point of the Netherlands. were carried out from 10.00 to 18.00 fading. But at this stage we really did
Note that neither of them was on Saturday and from 10.00 to 16.30 run out of things to do"!
on an elevated position (this is on the Sunday. Because of the wide frequency
crucial). Both Bob and Hans were at The sea was quite calm and Bob split (10.278 and 10.4GHz) teams
the top of the beach, barely above now wants to repeat the experiment were able to pull off one other stunt,
sea level. under rougher sea conditions, namely simultaneous full -duplex
END
Practical Wireless, December 1995 56
BARGAIN BASEMENT
Kenwood TM431-E u.h.f. transceiver, Yaesu FT -7(B) 50W Mobile
Write your advertisement clearly in BLOCK CAPITALS up to a maximum of 30 words plus 12
35W o/p, boxed, as new and with all transceiver 3.5 - 28MHz, seldom
words for your address - and send it together with your payment of E3 00 (cheques payable to
PW Publishing Ltd I, or subscriber despatch label and corner flash to Zoe Shortland, PW accessories and manual, £230. GPV- used mobile, very good condition
Bargain Basement, Arrowsmith Court, Station Approach, Broadstone, Dorset BH18 8PW. 7 three step collinear base station complete with mic and 14MHz
antenna, 28ft. RG214-U feeder, as mobile antenna, £250. Buyer
Subscribers must include the despatch label bearing their address and subscription number
to qualify for their free advert. new, £20. Warren Smith G3ZJS, inspects collects. Tel: Newport,
Leicestershire. Tel: 0116-271 3944. Gwent (01633) 266745.
Adverts published on a first -come, first -served basis, all queries to Zoe Shortland on (01202)
659910. LEQtronics complete Morse course, Yaesu FT -790R 430MHz multimode
seven audio C90 cassettes of about portable, £225 including new
Advertisements from traders, or for equipment that is illegal to possess, use or which cannot batteries, case and antenna. Trio h.f.
be licensed in the UK, will not be accepted. No responsibility will be taken for errors. 90 minutes each tape, with complete
notes to each cassette, from 1-100W mobile TS -120V, boxed with
nc-mic, £350 o.n.o. Microwave
For Sale beam), £95.535A (delayed sweep), beginners to above 12 words a
modules, 144MHz transverter, mint,
£95. Transistor curve tracer, £150. minute, £20. Vic G7PHJ, Cornwall.
American Megatrends multi -mode Tel: (01579) 348127. £120. Stephen, NW London. Tel:
Advance audio generator, £25.
PC DX40 420Mb HD, twin -speed CD, (01956) 544202.
Marconi frequency/timer counter,
Pacel4,400FAX modem, 3 'A & 5 'Ain Mast, telescopic tiltover by
£75. Usher, 85 Bromham Road,
floppies, 4Mb RAM, new CTX colour
Bedford MK40 4BS. Tel: (01234)
Tennamast, 25 feet, £120. George Wanted
monitor, 300Mb software installed. GOBGA, QTHR. Tel: (01527)570212.
354767. Eddystone communications
Sale or swap for good receiver. Tom.
FT-101ZD serviced, new valves, mic, MFJ Super Hi -Q Loop antenna 10- receiver, all models, but in particular
Tel: 1015361522007.
manual, set of spare valves, £350. 30MHz with remote control and 960, E835, ECI 0, 820, 870a and any
Amstrad PC3086 computer, 32Mb FC707 antenna tuner, new bands, power supply never used, in box, diecast speakers. Also Clarke &
hard drive 31 and 5% disk drives, £60. G3WRD, Suffolk. Tel: (01787) £225o.n.o. Terry, Wakefield. Tel: Smith school radio receivers,
colour monitor, Amstrad DMP4000 280259. (01942) 823108. wartime utility sets and Camper &
printer, all in good condition, £220. Nicholson badged receivers, these
Mick Watkins, Whitstable. Tel: HF Receivers: Racal RA17, operating Trio TR-2500 144MHz f.m. hand-held were made for them by Eddystone.
manual, circuit, mains lead, set of transceiver, ten memories,
(01227) 266460. Peter Lepino, Surrey. Tel: (01374)
spare valves, bargain, £125. Marconi toneburst, 300mW or 2.5W r.f. out, 128170 (anytime) or FAX:101372)
AOR 3000A still under guarantee Guardian (rare receiver) uses battery pack refurbished and 454381.
with less than 20 hours use, miniature valves in cabinet, mint, modified, comes with manual,
Diamond Discone Aerial and two £120. Navy receiver 62B good Eddystone EB35 A/50 diecast
charger and extras, £80 plus
handbooks, Scanning Directory and working order, £90. Tel: (01482) speaker, Hallicrafters SX32 or SX28.
postage. G3SYD, Crawley. Tel:
Scanning Secrets, perfect order 869682. Alan, Staffs. Tel: (01538) 702187
(01293) 511708.
£595. Tel: Bournemouth area (01202) anytime.
892986 (not between November 11 Icom IC -28H 45W, 20 memories, tone
Two, yes two, Compaq XT/PCs plus Eddystone EC1O, EC1O Mkll, EY2,
squelch, £130. Two of BNOS
and 30th). a wealth of spares and manuals. Sell
(LPM144-3-100) linears with pre - EB35, EB36, EB37, EM34, 31A, 960,
AVO valve tester, 35-40 years old. for, £250 o.n.o. or exchange for 962, speaker, 688, 881, 889, cabin
amps & power level indicators, (3W
Phillips f.m. and a.m. generator Capco 160/80m magnetic loop, if you
in for 100 out), £145 each. Tel: Surrey feeders, 870, 870a, etc. Dead or alive
GM2889. Pye wide range audio can deliver/collect. (RDP - non or parts only. Peter Lepino, Surrey.
0181-397 7823.
frequency oscillator. Pye driver). Messages on Tel: Stockport Tel: (01374) 128170 or FAX: (01372)
Icom IC -730, £350. Yaesu FT-212RH, 0161-477 5303. Written/part ex
electrostatic volt meter, 12k4 RMS 454381 anytime.
£220. Yaesu FT-4700RH, £300. Home- 80/40m loop, offers considered.
max. All about same age. Offers. Tel:
brew p.s.u. 20A, £45. Hygain V 10m GOOZK, QTHR. High gain ferrite rod antennas, must
Suffolk (01638) 527030.
mobile, no gaps, DTI authorisation, be half inch in diameter, no more or
Diamond CP-5 5 -band vertical £90. Icom IC24ET accessories, BM Yaesu 101ZD all bands with f.m., less, must be six inches long or
absolutely new/unused, boxed, battery pack, charger, d.c./d.c. mic., fan and box, in mint condition, more. Peter Tankard, Sheffield. Tel:
instructions. Includes radials converter HB, softcase, £20. Variac £450. Buyer collects. Ian, Walsall. 0114-234 3030 anytime.
(current list price £290) sale for £150. 0-270V, 2A, boxed, metred. Jeff, Tel: (01922) 30668 after 5pm please.
No. 19 set Mkll or Mklll, power
BBC -B series 7 Microvitec v.d.u. Warks. Tel: (01789) 773286.
Yaesu 101ZD, mint with correct supply working if possible! or
dual 80/40 disk extra ROMs,
Icom IC475 h.f. transceiver, £675. Yaesu base mic., fan, f.m. and working No. 19 set with ancillary
manuals, all items in pristine
AOR 2002 scanner, £225. Kenwood manual, £400. Andy G7UAD, Derbys. equipment to fit into 1942 Bedford
condition, £85. No offers please,
TH-79E dual -band hand-held, £320. Tel: 0115-930 8096. QLR 'Y section'. HRO ancillary
carriage extra. G2FZU, Notts. Tel:
PK232, £140. BNOS 430MHz 50W equipment and manual. Tel: London
(01636) 813847. Yaesu FT -23R 144MHz hand-held
linear, £100. Yaesu G500A elevator 0181-682 1163 after 2pm.
Drake RBE 150kHz to 30MHz a.m. (new), £230. Malcolm, Ruislip. Tel: complete with battery packs
synchronous detector, s.s.b., n.b.f.m., (01895)676919.
FNBI0/FNBI/PA6. quick charger If you are selling equipment via 'Bargain
RTTY, narrow c.w., mint condition, NC29, mobile bracket MMB32, Basement' it is in your interest to
Icom ICR-7100 HF receiver 500kHz - operating manual and soft leather ensure cheques have been 'cleared' by
complete with shareware software,
2GHz, speech synthesiser fitted, case, £200 o.n.o. G7IYI, QTHR. Tel: the bank before parting with your
box and manuals. Datong AD370
boxed as new, £900. Pete, Surrey. (01285) 750327. equipment. If in doubt about cheque
active antenna, £750 o.n.o. Stephen clearance times and bank fees for
Tel: 0181-393 9115.
G7VFY, NW London. Tel: (01956) 'express' cheque clearance, or for
Icom ICR-7000 scanner, £450. Icom Yaesu FT -290 MkI 2m m/m portable,
544202. returning un-paid l'bounced'l cheques,
ICR70 receiver, £295. Pakratt £225 o.n.o. FT -790 Mkl 70cm m/m
you are advised to consult your bank.
Drake TR7 noise blanker, cooling fan PK232MBX, £125. Manuals Yaesu portable, £250 o.n.o. Both with mic.,
When advertising equipment for
0.3KHz, 1.8KHz, filters, manual, PS7
FRT-7700, £15. HP signal generator
carry case and manual. Kenwood sale, you should clearly state in your
heavy duty p.s.u., model 977 astatic 8640B, £500. HP oscilloscope 182C, TW4100E dual -band mobile (no advert whether equipment is
mic., boxed, £750. Full workshop £700. Tektronix oscilloscope 475, mount), £325 o.n.o. Martin, Milton professionally built or 'home -brewed' or
manual, £15. Bill G3WNI, Devon. Tel: £350. Tel: Middlesex 0181-5606113 Keynes. Tel: (019081 378944 evenings. modified. You are also advised to insure
(01823) 680778. equipment against damage during
after 6pm. Yaesu FT-290RII multi -mode with transit (details available from the Post
Eddystone 670A communications Icom R72E, 30kHz to 30MHz, 99 NiCads, £275. Kenwood TH-26E Office or carrier of your choice).
receiver (working), nice condition, memory channels, s.s.b. scanning 144MHz hand-held, £150. Maldol The Publishers of Practical
£50. Tel: Burghead (01343) 835 635 modes, f.m. opt., new June 1995, 1000 SWR meter, £50. Supatutor plus Wireless also wish to point out that it is
after 6pm the responsibility of the buyer to
new condition, cost, £825, sell for, Morse tutor, £50. All mint boxed. Mic
ascertain the suitability of goods
Ex -lab Tektronix 5in oscilloscopes, £590, bargain. Tel: W. and p.t.t. switch, £25. Colin, Wotton-
offered for purchase.
type 534, £80. 551 (true double Yorks (01535) 635433. u-Edge, Glos. Tel: (01453) 842419.
Bargain
Basement
Practical Wireless, December 1995 December 57
1995
 1995 INDEX
Practical Wireless Index. Volume 71. January to December 1995.

Constructional It's A Classic ... The KW Vespa SSBTransmitter by Ben Nock G4BXD 48 July
A Four & Six Filter by Ken Ginn G8NDL 50 June It's A Classic ... The RCA AR88D Receiver by Ben Nock G4BXD 24 Oct
A Quick Quagi by Kevin James G6VNT 35 Sep Kits & Bits - Building Your Hobby by Clive Hardy G4SLU 26 Jan
Antenna Tuning - The Simple Way by Ben Nock G4BXD 43 Jan Mannion's Morse Method by Rob Mannion G3XFD 40 June
Band Edge & QRP Finder by Tony Lymer GMODHD 32 Apr Mississippi Mystery The MFJ Secret by Kathy Moore 25 July
Be Careful Using Your Whip by Jeff Harris G3LWM 41 Mar Morse Choice by John Goodall GOSKR 27 June
Controlling That Magnetic Loop! by Gordon Lumley G3DJE 26 Aug Other Cases For Morse by John Worthington GW3C01 43 June
Locking The Robin To Droitwich by Mike Rowe G8JVE 30 Dec Pass The 'Black Country Screwdriver' Please by Ben Nock G4BXD 40 Dec
Modding The Robin by Ken Ruiz G4SGF 24 Dec Peak Radio Practice by Dr. Andrew Taylor G4SSC 35 July
Multi -Band Antenna Matching Unit by Alasdair Fraser GM3AXX 46 July Pot Ratios By Computer by Jim Butler GM3ZMA 37 May
Olympics On Six - Modifications To Band Pye Olympic Practical Wireless Goes Dutch by Rob Mannion G3XFD 56 Sep
by Ken Ginn G8NDL 32 Sep Push Start by John Goodall GOSKR 45 Mar
One Valve Miracle - Jim Allardyce VK4DJA 41 Feb Reflecting On Collecting by Ben Nock G4BXD 36 Feb
Pascoe's Penny Pinchers by Dick Pascoe GOBPS 41 Aug Repeaters - The UHF Side by Tex Swann G1TEX 16 Feb
PW Daventry 7MHz Receiver by Dave Howes G4KQH Part 1 26 Oct Seated One Day by John Worthington GW3C01 55 Jan
PW Daventry 7MHz Receiver by Dave Howes G4KQH Part 2 56 Nov Some Morse News From You by Rob Mannion G3XFD 45 June
PW Martlet 70MHz FM Transceiver by Mike Rowe G8JVE Part 1 32 Mar Switching On And Warming Up by Rob Mannion G3XFD 24 Feb
PW Martlet 70MHz FM Transceiver by Mike Rowe G8JVE Part 2 36 Apr The 13th Annual Practical Wireless 144MHz QRP Contest Rules 48 June
PW Martlet 70MHz FM Transceiver by Mike Rowe G8JVE Part 3 42 May The Forgotten Genius by Stephen Poole 30 Feb
Rambling Delta HF Antenna by Bryan Wells G3MND 32 July The Practical Wireless 1995 144MHz QRP Contest Results 52 Nov
Simply Linear On 6 by Derek Holmes GW3JSV 37 Sep The Practical Wireless Datacard Guide by Kevin Nice G7TZC 53 May
Tandy 49 to 50MHz Transceiver Modification by Peter Julian G7PRO 23 Apr The St Brandon DXpedition by Paul Fry GOFUS 40 Nov
Testing - In The Wink Of An Eye by Gerald Donington G4LNO 32 Feb The Welsh QRP Club - Three Watts From A Drainpipe
The High Flyer - 18MHz Antenna by Victor Goom G4AMW 33 Nov by Leighton Smart GWOLBI 26 Apr
The Key 7 - Opening The Door To Milliwatting Top Band Targeting by John Hucklebridge G3ENR 53 Jan
by Steve Ortmayer G4RAW 30 Apr Tour To Papa Stour by Robert G. Miles GM4CAQ 44 July
The Key Project by Ben Nock G4BXD 33 June Traffic Signs For The Radio Amateur by James Glanville G3TZG 29 Mar
The Road To Top Band - The Budget Way by Ben Nock G4BXD Part 1 48 Mar Valve & Vintage Special By Ron Ham 24 Feb
The Roche Top Band Transmitter by George Dobbs G3RJV 36 Jan Wooding's World by Mike W000ding G6IQM 28 Sep
The Slim Cobra HF Antenna - A Charming Idea Your Guide To The Leicester Amateur Radio,
by John Heys G3BDQ 28 Aug Electronics & Computer Show 42 Nov
The Two -Fold - 144MHz Beam Antenna by Kevin James G6VNT 50 Aug Your Guide To The London Amateur Radio & Computer Show 38 Mar
The Weekend Special by Bob Harry G3NRT 30 July
Three Canes In A Mounting by Brian Shersby GOISL 43 Mar Theory
Antenna Workshop - 3 -Element HF Beams by Ray Fautley G3ASG 46 Sep
Errors & Updates Antenna Workshop - 50MHz Antennas by David Butler G4ASR 57 Jan
The Key Project - June 1995 17 Nov Antenna Workshop - Baluns by Gerald Stancey G3MCK 60 June
Antenna Workshop - Practical Antenna Advice
What A Good Idea! by Rev. George Dobbs G3RJV 48 Apr
Barbecued Loop Tuner by Johnathon Brown G4JGL 50 Feb Antenna Workshop - Practical Portable Antennas
Cheap Spacers by Gordon Lawes G3PLT 51 Feb by Rev. George Dobbs G3RJV 50 July
Coil Taps by Pieter Balkstra PAOFBI 51 Feb Antenna Workshop Rafter Special by Ray Fautley G3AG 54 Mar
Improved Seal For J -Pole Antenna by L. Nelson -Jones G4JDW 50 Feb Antenna Workshop - Transmission Lines by Gerald Stancey G3MCK 48 Oct
Personal Pointers by William Andrews G3DVW 45 Aug Antenna Workshop - Tuned Feeders by John Heys G3BDQ 50 Nov
Pocket Pole by Arnold Moon G3RGB 45 Aug Antenna Wortkshop - Low Slung Antennas by John Heys G3BDQ 60 May
Potted Antenna by G. J. Pass G1VBT 51 Feb Around The Loop by Richard Q. Marris 40 May
QRP ATU For 50MHz by Ken Grover G3KIP 44 Aug Back To Basics - Transmitting Antennas by Gerald Stancey G3MCK 45 Jan
Ring Pull Ropes by Godfrey Manning G4GLM 44 Aug EMC - The Mobile Menace by Richard Ayley G6AKG Part 1 27 Mar
Scales From The Schoolroom by J. Bolton G4XPP 45 Aug EMC - The Mobile Menace by Richard Ayley G6AKG Part 2 40 Apr
Shack Alarm by Patrick Walton 51 Feb Examining An Image Problem by Murray Ward G3KZB 44 Feb
Terrarium Antennas by Ian Wye GOOKY 44 Aug Examining An Image Problem by Murray Ward G3KZB 46 May
External Noise Vs Receiver Sensitivity
Features by Mike van der Westhuizen ZS6UP 36 Oct
A Further Touch Of Class by Patrick Allely GW3KJW 44 Apr Gaining Power by Patrick Allely GW3KJW 52 Sep
Am I Sending Fast Enough For You? by John Worthington GW3C01 43 June Multi -Delta Antennas by Denis Payne G3KCR 34 Aug
Amateur Radio & The Internet by Mike Richards G4WNC 34 May
Amateur Radio Holiday - Have You Packed Your Reciprocal Licence? Book Reviews
by Peter Barville 28 July A Comprehensive Radio Guide, Books 1 - 5 17 Nov
Baird's Beams by Ray Herbert G2KU 31 Feb Cubical Quad Antennas 45 Nov
Basic Computer Logbook by John Beaumont G3NGD 33 May Electron Tube Locator 55 Aug
Basic QSOs In Italian Part 3 by Gareth Roberts GW4JXN Essential Characteristics (Tubes & Transistors) 55 Aug
and Paolo Pellegrineschil5UP 50 Jan Handbook of Radio, TV, Industrial & Transmitting
Bits & Bytes Special by Mike Richards G4WNC 24 May Tube & Valve Equivalents 17 Nov
Building On Experience by Rob Mannion G3XFD 26 Jan Practical Electronics Handbook 46 June
Buying On A Budget - A Guide To Rally Bargain Hunting Radio Amateur Callbook - International Listings 59 Apr
by Ben Nock G4BXD 40 July Radio Amateur Callbook - North American Listings 59 Apr
Chasing That DX! - Breaking The 100 Barrier by Chris Page G4BUE 35 Nov Radio Communication Handbook 47 Jan
Chester To China by Chris Seward GWOPJX 42 Sep RCA Receiving Tube Manual 55 Aug
Choosing & Using Your Computer 28 May RCA Transmitting Tubes 55 Aug
Closed For The Duration by Patrick Allely GW3KJW 39 Feb Reflections - Transmission Lines And Antennas 47 Jan
Collector's Corner by Rob Mannion G3XFD 43 Feb The ARRL Operating Manual 45 Nov
Computing The Code by Tex Swann G1TEX 44 June The Complete OXer 45 Nov
Cruising On The Air by John Hines GOPNX 50 May The RSGB Amateur Radio Callbook & Information Directory 47 Jan
Data Modes Without Breaking the Bank! by Mike Richards G4WNC 29 May World Radio TV Handbook 1995 59 Apr
Design Dilemmas by Ian Poole G3YWX 31 Oct
DXpertise With Devereux by Mike Devereux G3SED 30 Nov Reviews
Friendship The Key To Ireland's Amateur Radio by Rob Mannion G3XFD 54 Aug ADI AT -200/400 1441430MHz Hand -Held Transceivers
From Screwdriver To 'Scope by Elaine Richards G4LFM 22 Dec by Donna Vincent G7TZB 48 Sep
Goodall's Goodies by John Goodall GOSKR 46 Aug Alinco DJ -191 144MHz Hand -Held Transceiver
Harding's Home -Brew by Stephen Harding G4GJS 36 Dec by Richard Newton GORSN 18 Dec
It's A Classic The Eddystone EC10 Receiver by Ben Nock G4BXD 48 May Alinco DJ -G5 Dual -Band Hand -Held by Rob Mannion G3XFD 44 Sep

58 Practical Wireless, December 1995

 1995 INDEX

Alinco DR -150E 144MHz Mobile Transceiver by Kevin Nice G7TZC 24 June News '95. 12 Jan, 12 Feb, 12 Mar, 12 Apr, 12 May, 12 June, 10 July, 12 Aug, 12
Alinco DR -160E 144/430MHz Dual -Band Transceiver by Kevin Nice G7TZC 22 July Sep, 12 Oct, 12 Nov, 12 Dec
Alinco DX -70 HF &50MHz Multi -mode Transceiver
Novice Natter. by Elaine Richards G4LFM. 14 Jan, 18 Feb, 16 Mar, 16 Apr,
by Rob Mannion G3XFD 31 Aug
16 May, 16 June, 12 July, 16 Aug, 16 Sep, 18 Oct, 18 Nov, 16 Dec
Electronic Workbench Version 4 by Mike Rowe G8JVE 22 Oct
lcom IC-W31E Dual -Band Hand -Held Transceiver Packet Panorama. by Roger Cooke. 64 Mar, 65 May, 65 July, 65 Sep, 14 Nov
by Richard Newton GORSN 20 Oct
Icom IC-Z1E 144MHz Hand -Held Transceiver by Kevin Nice G7TZC 40 Oct PW Book Service. 72 Jan, 64 Feb, 72 Mar, 64 Apr, 72 May, 72 June, 71 July, 71
Index QRP Plus Transceiver by John Goodall GOSKR 22 Feb Aug, 71 Sep, 63 Oct, 79 Nov, 63 Dec
Kenwood TS -870S HF Transceiver by Rob Mannion G3XFD 26 Dec
MFJ-784 Digital Signal Processing Filter by Ed Taylor G3SQX 24 Jan Radio Diary. 52 Jan, 45 Feb, 20 Mar, 13 Apr, 17 May, 46 June, 17 July, 25 Aug,
PK-232 MBX Multi -Mode Controller by Roger Cooke G3LDI 48 Feb 25 Sep, 17 Oct, 16 Nov
QRP Sprint 3.5MHz Transceiver by Peter Barville G3XJS 33 Jan
SD -610 HF Antenna by John Goodall GOSKR 37 Aug Receiving You. 10 Jan, 10 Feb, 10 Mar, 10 Apr, 10 May, 10 June, 8 July, 10 Aug,
Yaesu FT -10R 144MHz Hand -Held Transceiver by Tex Swann G1TEX 46 Nov 10 Sep, 10 Oct, 10 Nov, 10 Dec
Yaesu FT -51R Dual -Band Hand -Held Transceiver
by Richard Newton GORSN 22 May Scene USA. by Ed Taylor WT3U. 56 July, 56 Oct
Yaesu FT -8500 Dual -Band Mobile Transceiver
by Leighton Smart GWOLBI 25 Nov Special Offers
Yaesu FT-900AT Transceiver by Rob Mannion G3XFD 24 Mar DB-1101 Dual Band Antenna 20 Mar
DB-7900 Dual -Band Antenna 20 Mar
Obituary NB -30W 144Mhz Power Amplifier 20 Mar
Jack Hum G5UM - An Appreciation 22 Apr Passport To World Band Radio 1996 62 Nov
PW Gift Subscription 43 Dec
Regulars QS -200 Dashboard Mobile Holder 52 Jan
Arcade. 67 Jan, 59 Feb, 67 Mar, 59 Apr, 67 May, 67 June Radio Amateur And Listener's Data Handbook 17 Feb
Short Wave Communications 19 Apr
Bargain Basement. 69 Jan, 61 Feb, 69 Mar, 61 Apr, 69 May, 69 June, 67 July, 67 Short Wave Communications 24 Sep
Aug, 67 Sep, 59 Oct, 75 Nov, 57 Dec The ARRL Satellite Anthology 2nd Edition 62 Nov
World Radio TV Handbook 1994 Edition 67 June
Bits & Bytes - The Computer In Your Shack. by Mike Richards G4WNC. 60
Jan, 53 Feb, 59 Mar, 53 Apr, 56 June, 61 July, 61 Aug, 61 Sep, 54 Oct, 72 Nov, 54 Dec Specifications - The Mysteries Explained. by Ian Poole G3YWX. 49 Jan,
46 Feb, 57 Mar, 46 Apr, 56 May, 53 June, 52 July, 52 Aug, 55 Sep, 63 Nov, 46 Dec
Broadcast Round -Up. by Peter Shore. 65 Jan, 57 Feb, 65 Mar, 57 Apr, 64 May, 64
June, 64 July, 64 Aug, 64 Sep, 53 Oct, 73 Nov, 53 Dec Subs Club Special Offers
Alinco DJ-SI EZA 144MHz Hand -Held Transceiver 16 Nov
Club Spotlight. 18 Jan, 20 Feb, 18 Mar, 18 Apr, 18 May, 18 June, 16 July, 20 Aug, All About Vertical Antennas 67 Mar
20 Sep, 16 Oct, 20 Nov, 13 Dec All About VHF Amateur Radio 24 Sep
Antennas And Techniques For Low Band DXing 19 Jan
Competitions. MFJ-259 Antenna Analyser 20 Dec
Spot The Difference - 16 Jan, 19 Mar, 16 June, 24 Aug, 9 Oct, 9 Dec MJF-948 Antenna Tuner 25 Aug
Wordsearch - 9 Feb, 9 May, 18 July, 9 Sep, 9 Nov PCs Made Easy 67 May
Peter Jones Morse Keys 23 June
Dayton '95 Promo. 67 Jan, 59 Feb, 21 Mar Radio Communication Handbook 21 Feb
RSGB Amateur Radio Callbook & Information Directory 21 Feb
Editor's Keylines. by Rob Mannion G3XFD. 9 Jan, 9 Feb, 9 Apr, 9 May, 9 June, 6 The ARRL Antenna Compendium Vol. 4 18 July
July, 9 Aug, 9 Sep, 9 Oct, 9 Nov, 9 Dec The Superhet Radio Handbook 17 Oct
V968 NiCad Battery Charger & 8 x 500mAh NiCad Cells 19 Apr
Endnotes. 75 July, 75 Aug, 75 Sep, 67 Oct, 83 Nov, 67 Dec MFJ-259 Antenna Analyser 20 Dec

Focal Point - The World of ATV. by Andy Emmerson G8PTH. 58 Feb, 58 Apr, 65 Valve & Vintage.
June. 65 Aug, 58 Oct, 56 Dec by Ben Nock G4BXD 68 Nov
by Charles Miller 42 Oct
Free Gifts by Phil Cadman G4JCP 58 Sep, 44 Dec
430MHz 170cm) Repeater Datacard Mar by Ron Ham 58 Jan, 50 Apr, 54 May, 54 June, 54 July, 56 Aug

Guest Keylines. Clive Trotman GW4YKL President Radio Society VHF Report. by David Butler G4ASR. 62 Jan, 54 Feb, 62 Mar, 54 Apr, 62 May,
of Great Britain 1995 9 Mar 62 June, 62 July, 62 Aug, 26 Sep, 45 Oct, 70 Nov, 48 Dec

HF Bands Report. by Paul Essery GW3KFE. 64 Jan, 56 Feb, 60 Mar, 56 Apr,

59 May, 59 June

HF Far & Wide. by Leighton Smart GWOLBI. 58 July, 58 Aug, 62 Sep, 50 Oct,
64 Nov, 50 Dec

STILL AVAILABLE - PW BACK ISSUES 1991-1995!

But hurry as stocks are limited.
To order back issues either use the Order Form on page 62 of this issue
or telephone the Credit Card hotline on (01202) 659930.

Practical Wireless, December 1995 59

 Whilst prices of goods shown in advertisements

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Interface, programs, manuals, pictures. £28.50. SASE SOFTWARE, 78 Carmarthen Road, Swansea
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DIY INEXPENSIVE RADIO PROJECTS. Easy to

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Shareware reference guide It runs to more than 250,000 words and Is with headphones and boom microphone and manual
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Send f2.50 (voucher provided refundable on first order) or prices include P&P send large SAE for list. C.P. Surplus,
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Tel:(018921663298 FAX:101892)667473 Antennas. SAE G81KP, 1 Melstock, Weymouth, Dorset
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RAE ' THE VIDEO" The definitive learning aid for JAPANESE GAAS-FET, RF power module,
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WANTED high gain ferrite rod aerials must be half detailed course study booklet, packed with key
inch in diameter no more or less. Must be six inches learning points, facts and diagrams for instant TRANSCEIVER P.R.C. 316 H.F.A.M.C.W. Watts output
long or more. Contact Peter Tankard on Sheffield 0114 reference and easy revision. Only £22.50 plus E2 post with headphones and boom microphone and manual
2343030 any time. & packing or available to callers. last few. (105.00 Megger crank handle type 500V
Send cheque or postal order to: £45.00. All prices include P&P send large S.A.E. for list.
EDDYSTONE 730/4 communications receiver, must TRICORN MARKETING LTD 31 Berkeley Square, C.P. Surplus 56a Worcester Street Wolverhampton
be in good working order. Tel: Brian 0181-651 5345. Bristol BS8 1HP. Tel: 0117-921 5390. WV2 ILL Tel: 01902 20315

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60 Practical Wireless, December 1995

 Valves TOP PRICES PAID Educational
for all your valves, tubes, 1

VALVES GALORE Most valves available from stock. semi -conductors and ICs. COURSE FOR CITY AND GUILDS Radio Amateurs
Otherwise obtained quickly. Please send SAE stating Examination. Pass this important examination and
Langrex Supplies Ltd., obtain your licence, with an RRC Home Study Course.
requirements or telephone. VALVE & ELECTRONIC 1 Mayo Road, Croydon, For details of this and other courses (GCSE, career and
SUPPLIES Chevet Books, 157 Dickson Road, Blackpool Surrey CR0 2QP. professional examinations, etc) write or phone - THE
FYI 2EU. Tel: (01253) 751858 or Fax: (01253) 302979.
TEL: 0181 684 1166. FAX: 0181-684 3056. RAPID RESULTS COLLEGE, DEPT JX116, Tuition
House, London SW19 4DS. Tel: 0181-947 7272
VALVES WANTED for cash: KT:':, PX4,PX25 [45; I9am-5pm) or use our 24hr Recordacall service
DA100 £75; EL34, EL37 flO: ECC81/CV4024, CV4003, 0181 946 1102 (tooting JX300
CV4004, ECC83 f3. Valves must be Mullard/GEC, West HEATHKIT EDUCATIONAL PRODUCTS UK
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Tel: (01403) 784961. Fax: (01403) 783519. radio, £16.49. H. CORRIGAN, 7 York Street, Ayr KA8 8AR. Tintagel, Cornwall. Tel: 101840) 212262.

The international group for all WEATHER SATELLITE enthusiasts ELECTRONICS Phone for a
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The UK Scanning I)irectory

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Here is the hook every scanner owner has been wailing for! Listing over 20.000
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Price £17.50 + post. Overseas post add £2 Europe & sea, or £5 airmail.

= INTERPRODUCTS P651
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From The U.K. THAMES VALLEY

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LENTINI COMMUNICATIONS, INC. 400 yards from Junction' off M3.

AMATEUR SHORTWAVE SCANNERS COMMERCIAL SUNDAY 3rd DEEMBER, 1995

TWO-WAY MARINE
1030am-4.30pm 10am FREE ENTRY to the Bring and Buy Stand.
DAILY EXPORT TO THE U.K. Exhibitors invited. Manufacturers & retailers, accessory suppliers,
antenna suppliers, computers & component retailers etc.
YAESU, KENWOOD, ICOM, STANDARD, ALINCO
FREE CAR PARK. EVENT ON ONE FLAT LEVEL. REFRESHMENT'S AND BAR
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Accepted HD Promotions. Tel: 01494 450504

en el
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l'el/Fas (1181 905 748/4(24 hours)

Second User PCs

I has e a large range of 386 and 486 second use
PCs ideal for amateur radio, student or family. Advertisements are expected to conform to rules and standards
If you want a new PC, Monitor, System Unit, laid down by the Advertising Standards Authority. Most do.
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Practical Wireless, December 1995 61

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 r) r ri r--JrJ The books listed have
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anquace transrrissie,ns prorearnmes. for DXers and swls Along with sections on

Airband your door. Many titles

POP WENT THE PIRATES
AIR BAND RADIO HANDBOOK 5th Edition
David J ::erisensive history of Pirate Radio Thanks to Pup Went Me Pirates
are overseas in
Air band radio irsteeing enables you ha listen in on the conversalior.s between ;he whole era of people seeking to provide a popular alternative radio service.
aircraft and those on the ground who control thern and is all increasingly popuiar under quite considerable apposition will be remembered don't suppose we will
origin.
I

and fascinating hobby A new chapter on military air band has been added The ever see or hear the like of it again £15 95
author an air traffic Dreoller. explains more about this listereN hobby
'93aabx 99
Datamodes
AIR & METED CODE MANUAL 14th Edition
GUIDE TO FAX RADIO STATIONS
desceptions of Pie World Meteora.ogical Organisation Global
,cation Son-, ;met MTV metro stations. and Is and is paved with everything from the basics of short wave listening to explaining
detailed description of the The riow edition al :his super relerence xdk covers Ine ids lacsimile stations. FAX and RTTY In this updated version there are many new broadcast and utility
most ethers their trequences and methods of working. There is a section covering the stations listed
equipment needed to receive 54k opine radio. To give ye.: an idea of what is 188 page, t'':;.
deal lathe there are many page, , ' received FAX pictures
AIRWAVES 95 392 r.:,1:ei F20 00 UK SCANNING DIRECTORY 4th Edition
The Ccinciee HFIVHF/UHF Aviation Freduency Directory
This spiral bound book iisls aver 20305 UK s,a; rregunrcles from 25MHz to
Much or the more obscure (especially mhtaryl information is made accessible in GUIDE TO UTILITY STATIONS 1 Pali Articles on scanning in the UK
this volurre Not only are facilitas+activities listed giving their frequencies, but also I :' Ls 335 pages £1750
there are reverse lists - when the frequency is knurl the allocated user can be Joerp Klingentuss
found this book covers the complete rave range horn 3 to 30MHz together with the WORLD RADIO TV HANDBOOK 1995
Airways sectors are listed so much more clearly than in the Supplements The main adjacent frequency bands hcni U L 1501e12 and from 1 6 to 3MHz II includes .. L..daws! pa TV stations Receiver
transponder code groups are included. In tact the book covers all the ray from n I
details on all types of uti:ity stations mchding FAX and RTTY There are 19549 s title
entries 41 the frequency Ist and 3590 in the alphabetical callsign list plus press 608 ui;e,
services and meteorological stations Included are PITY & FAX press and metro
schen:: es Tcere re I f 8C0 canoes since VW tOth edition 534 paces 03000
AIRWAVES EUROPE General
IS published in a similar format to knaves 95 and POCKET GUIDE TO RTTY AND FAX STATIONS
un Irequencies There are v h f iu h I owl and military EAVESDROPPING ON THE BRITISH MILITARY
:':and Ireqences given foe 38 countries and their dependencies in east and west A handy reference book Agit; Hirt arid FAX stations together with modes and Michael Cannon
.rope A must for airband enthusiasts both in the UK and Europe 124 pages other essential informal' or the Wing is it'i ascending frequency order, from 1 6 to For the very first time a book has been csAlishei showno condor British
i 9 50 26 8MHz Military communications All you needrs a shod wore rece vet luts of time and
57 pages £395 patierce. and Ns secret world will open up to you providing many hours of
CALLSIGN 95 entoyrnent 4 5' 5 argent British military callsign list ever lo lu
The Civil & Military Aviation Callsign Directory RAVIOTELETYPE CODE MANUAL 13th Edition published
Intended for the aircraft and radio enthus+ast to use as a stand alone reference, or as 166 cage!:
a partner to Airwaves 95 Over 5300 military and 3000 civil callsigns are covered it .4 an, jt:, 1,11 lhe character. sties or telegraph
detail transmission on short waves. with ail commercial modulation types including voice THE COMPLETE SHORT WAVE LISTENER'S HANDBOOK
108 pages. £795 frequency telegraphy and comcrehensive ortorrhal'on on all PITY systems and c 4th Edition
alphabets Hare deirriett Hen, Heins d Haw: Hardy
FLIGHT ROUTINGS 1995 96 pages £14 00 This book ,s a comprehensive guide to the basics ol short wave listening
Compiled by TT 8 S J Whams Everything you reed to get started as an s.w I is explained in a clear and easily
This guide was produced with the sole aim at assisting arband listeners to Quickly understood manner Receivers. antennas frequencies. propagation, 0 -codes etc
find details al a flight once they have identified an aircraft's wllspn. Identifies ate all coveed
the flights of airlines. schedule. charter. cargo and mail. to and from the Frequency Guides 321 pages £1795
UK and Eire and overflights between Europe and America
140 pages f6 50 1995 Super Frequency List SHORT WAVE COMMUNICATIONS
Jaerg Klingeoluss Peter Rouse GUIDO
HIGH IN THE SKY This new CD-ROM has been designed to- are with IBM PCs or clones running Covers a very wide area and so provides an ideal inttodiction to the hobby of rams
Davis Barker 8 Mertenoe Windows 3.1. The CD-ROM comes complete with its own viewing software and comms International frequency listings for aviation. marine, military, space
This new edition comprises he sections The first seven sections are an includes 14000 frequencies that hart been extracted from the KlingenArss Guide to aunches, search and rescue, etc Chapters on basic radio propagation hew to work
introduction of radios, antenna and radio communications. information about StatIons. This frequency listing is sopp'erryritea by 1000 abbreviations and your radio and what he controls do. antenras and band plans
airways sections coven re v h f and h 1 aeronautical Communications. and a brief 1200 formerly active frequencies As this i:st pdated in January 95 nS I87 pages £4 50
look at ACARS The majority of tie book is taken -up by section eight. which lists all wellup-to- date
known Selcalls in three different sequences (by airline/operator. by Seicall and by £2000
registration) The 9th section is devoted to Selcalls used by executive tees these are Satellite
separate. since Mese Selcalis are not always heed Mostly re -written this volume FERRELL'S CONFIDENTIAL FREQUENCY LIST
contains the al kmportant Ireceency listings for the aeronautical retworks. airlines. 9th Edition AN INTRODUCTION TO AMATEUR COMMUNICATIONS
the military and !re commercial networks Compiled by Geoff Han gey SATELLITES
Spirally bound this easy -to -use reference book covers 1 6 - 28MHz in great depth, Hi'29U A P.-ckaid
all modes and utility SetwORS with new reverse frequency listing showing every This book describes several currently ayanapie systems. tell connection to ar
THE AIRBAND JARGON BOOK known frequency agans' 4isiari who, sing what frequency and mode. appropnate computer and now trey can De operated with Ridable software The
virhatt that cadsign? results of decoding s,gnals containing such intormation as telemetry data and
m give the newcomer some guidance on what to expect from Airbard and 386 pages £1795 weather pictures are dernonshated
new ,frxt the most from listening to it
.
132
This guide is essential reading for those not involved in the aviation industry It PASSPORT TO WORLD BAND
gives a valuable insight to many aspects of aviation Emotained are the principles of RADIO 1996 AN INTRODUCTION TO SATELLITE COMMUNICATIONS
Airband reception. aircraft instrumentation. radio services. weather navigation etc I' o_ds BP326
and air traffic control. to list but a fee Read this book and you could well be enjoy the world c' F A Wilson
tiodked includes features or A s rice iwth the mnirrum pi marrierat2S) hedunr s hock roomier, satellite
stations receive! reviews al
hours and anguage of sir with 1.111.1
UNDERSTANDING ACARS 2nd Edition frequency the blue pages pi:
channel guide to world band schedules 52111,
yiiii F14 ARRL SATELLITE ANTHOLOGY
-rrre is IN inluandhun you need underSled and decode the Aircraft lne best from Me Amateur Satelice News column and articles out 01 31 Issues of
emmunicatems Addressing and Reporting System otherwise known as AGARS. SHORT WAVE INTERNATIONAL OST have been gathered together in this book The latest intormation on OSCARS 9
. w r.,, 1, FREQUENCY HANDBOOK through 13 as well as the RS satellites is included Operation on Phase 3 satellites
hequency listing covering 4001th/ - 30MHz 10SCAR 10 and 131 is covered in detail.
97 naqes £5 95
WORLDWIDE AERONAUTICAL COMMUNICATIONS
FREQUENCY DIRECTORY 2nd Edition NEWNES GUIDE TO SATELLITE TV
It.tbert F Evans
is book cows aeronautical tabu communications, voice and epitai, within the PW BOOK SERVICE Dt,
his book true 3rd edition. is a hard bound volume, printed on high qually paper
,ace of h f. and v ht/u.h f frequency bands Commercial military and para- The author is a satellite repair and installation engineer and the book core -

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military operations are included Divided into logical sections. it provides useful 1
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Broadcast (01202) 659930 ("HOURS) SATELLITE EXPERIMENTER'S HANDBOOK 2nd Edition

A GUIDE TO THE WORLD'S RADIO STATIONS BP355
Peter Shore Internet orders: bookstore4pwpub.demen.co.uk The book is divided into lour men se Lions History. Getting Started. Technical
As in Broadcast Round -all' his column in PIV. Peter Shore has laid this book omit

Practical Wireless, December 1995 63

Topics and Appendices. It provides .ntormation on spacecraft buil by and for, r1". HE ANTENNA COLLECTION (RSGB)
amateurs In addition. it discusses matter TV-voadcast and other satellites Edited try Erwin David 54001
interest to amateuts 313 pages. E 14 50
PW BOOK SERVICE This Woe centainsw collection of useful and interesting h f antenna aloes. first
miters* in the RSOB's Radio Cortanunicationmagaaine. between 1968 and 1989.
SATELLITE TELEVISION along with other useful information on ancillary topics such as feeders tuners

001=
A laymane guide bate -5 ..f.f5f. 11E,, and rEPE...1^ '5 n: ifElErEd .1:11aff

eter Pearson 2]?

-'iceJres train space, thafs what satellite television is all about °tem satellites
15000km high, receive TV signals from stations on the earth ant Je 7aismit them HE ANTENNAS FOR ALL LOCATIONS (RSGB)
eack again This book explains all you reel to know to set up eetellite IV
-'mina! at borne dish and accessories cable a-rt Leer
(01202) 659930 (24 HOURS) T- ... . . . J eork whether it be or
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useful tios protects and ideas 322 pages 113 99
SATELLITE TELEVISION INSTALLATION GUIDE Internet orders: bookstoreAspwpub.demon.co.ek
Ed on INTRODUCTION TO ANTENNA THEORY BP198
.an Breeds
A practical g.ide se.a id., Smr ,vetaoal eeide. fines on installing and Ire :urn' ewe, ere !'e We. evan nid a.nd and transmitting
aligning testes based Jr. practical ecienence antennas. with emphasis on the mechanics and mmimai use Of mateernatts. Lots
76 pages 15 CC 8 electronics to gel the most horn this beak Chapters include details on measuring of diagrams help with the understanding of the sublects dealt with Chapters include
resonance, impedarce held strength and pertorrnance, mats arc information on efficeency. impedance. parasitic elements and a variety of different
WEATHER SATELLITE HANDBOOK materials and exCernaarra antennas antennas 86 pages £2 95
5th Edo on
Dr Ralph E Taggart WB8DOT
PRACTICAL ANTENNAS FOR NOVICES
This book explains all about weather satellites. how they work and hem you can ANTENNA IMPEDANCE MATCHING (ARRL)
reoeve and decode tee,' signals to provide the fascinating pictures al the world's Wi Ifa
e ',Aran In 'his guide, mitten especiaby lui newly qual lent "alders C! the UK novice
weather. Plenty of circuit diagrams and satellite c'edict nip arodrarro Propel impedance matching W an antenna to a transmission line is of concern to Licence. John Heys describes in detail now to build simple but etlicient antennas
192 pages £1450 antenna engineers and to every radio amateur A properly matched antenna as the for each of the Novice bands up to 434Mhtt, as well as 'useful arc !any equipment
termination for a line minimises teed -I ne losses Power can be fed to such a line to ensure that they are worlung correctly A complete chapter is devote no the seer
WRTH SATELLITE BROADCASTING GUIDE without the need for a matching network at the line input There .s no mystique and common-sense aspects ul installing area using a transmitting antenna
1995 Edition Bart Kupees involved in designing even the most complex multi element networks for this book serf; be invaluable no only to Novices, but also to any beginning amateur
This brand new publication, written by one of the experts Iron) the respected World broadband coverage Malang for easy -lo -build antenna systems that really work
Radio TV Handbook, seal be a great lee to everyone interested m tee warIl doef Ihr S'In
satellite radJo and terevison Featuring over 300 pictures and graphics the
information you need to know about install reg your own satellite system
ANTENNAS AND TECHNIQUES FOR LOW -BAND °XING PRACTICAL ANTENNA HANDBOOK 2nd Edition
366 pages £15.95 (ARAL) ausepr J LdE
John Develdere °MON As the name suggests, Iris book offers a magical guide at everything lo do wee
This unusual book will be of particular interest to 1 8 35 and 7taFtr operators as antennas from n I la microwaves It also has sections on rampage!, on,
it's packed with information on antennas and operating tips le 'Top Band to Forty' transmission lines, antenna tundamentais and a helpful introduction to radio
Scanning tans. There ate chaplets on low band propagation, operating techn pees equipment broadcasting and communication the book neatly balances a practical apeman
and for Me computer minded there's a chapter on neerly-available low band with the minimum oh mathematics. good diagrams and a livery text
AN INTRODUCTION TO SCANNERS AND SCANNING software 437 pages £23 95
BP311 393 pages £1450
D. Pace PRACTICAL WIRE ANTENNAS RSGB
This book is ideal for anyone wanting to know what scanning is and how it *ores ANTENNAS FOR VHF ANO UHF 8,31)1 John Heys 53800
There are also chaptees on radro in gereral, covering antennas. radio waves and I D Poole Many fait entnusiasts nave to be torte -I with wee antennas John Heys- practical
how they travel types of transmissions. Meade:Wing and amateur radio All in all a Antennas are a very irroorlant part or any receiver or transmitter and in this took approach to wire antennas C'dvicles plenty Cl ,deal and projects to help gel the best
superb starter book the. author gees a general background to antenna operation as well as describing out of a simple system A'0- :0. . -.EfEEfr,E.aSpurre
152 pages £4 95 antennas that are sortable to, vh I and u.h I operation Chapters include Basic 103 pages £850
Concepts Feeders. Tye Dipole. Aerial Measurements and Practical Aspects There
SCANNER BUSTERS -s something of a far everyone wth an interest in antennas in this book RADIO AMATEUR ANTENNA HANDBOOK
D C Poole 104 pages £495 Crt W6SAI 8 S D
This guide to the methodology of beating the electronic ban on Scanning. deals Yagi Quad Ouagi and, al nociontal and sipper
wth the subject of scrambling and encryption systems the author explains in ARRL ANTENNA BOOK 17M Edition antennas are covered aft e, s use: ege the best location. DX
simple terms how p m r wares the new digital cellular radio telephone systems. Tres velum now in its 11th editor contains essential information regarding antenna relent, ground loss and radials
spread spectrum. Irequency hopping and emergency seances communication How propagation and constructional details of lust about every type of antenna Imam to 188 pages £750
le get more horn your scanner and a list of frequencies to listen to are also covered. man Included is a 35' diskette contain in PC programs for Yagi analysis.
s a ;real reference for bolt' new scanner owners and veterans alike arCOagatian forecast ng transmissan '.ne analysis and ate, A define must RECEIVING ANTENNA HANDBOOK
I en Joe Can
Your receiver is only as good as your antenna Tee book is a complete guide to
SCANNERS 2 INTERNATIONAL ARRL ANTENNA COMPENDIUM Volume One high performance receiving antennas It s a commeheesive examination of
Peter Rouse GU1DKD ascinatieg and Athena .itee,besrea material Areneg re topics discussed are antennas intended specifically for recennng purposes An esseMial addition to your
The companion book to lee best selling Scanners provides even more information quads and loops ing periodic arrays beam and multi -band antennas, verticals and technical library, the listeners- antenna bble
on the use of the. and u.h.l. communications bands It gives details on how to 169 Pages £11 50
construct accessories to improve the petiorrnance at scanning equement The hank
is J neeeaeorel its scone and aondi-n nequInne, anncadons nor all three ITU SIMPLE LOW-COST WIRE ANTENNAS FOR RADIO
ARRL ANTENNA COMPENDIUM Volume Two AMATEURS
.'curs, ARAL HO W I Crr W6SAI 8 S D Gowan W2LX
Efficient antennas le Top Band to Pm, including invisible- antennas or difftult
SCANNERS 3 PUTTING SCANNERS INTO PRACTICE. published in OSI Inose papers are ca,ectea .n mis volume station locations Cleat explanetions of resonance, radiation resistance, impedance
New Edition 4th Revision 206 pages. £9.50 sw, !rels^r,r1 srs1.,rbi:3nrerlarlr.--as an, amen
Pole douse
This rs the Mutt revere] and compete y touted edition at Scanners. the complete ARRL ANTENNA COMPENDIUM Volume Three
vh h t radio listeners guide and contains everyteing you need to know to put Edited by Jerry Hall MID W1F8S ANTENNA NOTEBOOK (ARRL)
your scanner to better use There is vestry more elormation than ever before on As the title suggests. this book is the Mira in the continuing series on practical Doeg Dekta* W1113
treceeency hating in pancuar actual frequencies used by coastal stations. airtieids antennas. theory and accessories melted by the ARM. The book relletts the This book provides erS of designs, in simple and easy to read term. lot simple
and emergency services Also is Me first time n I Ishort wave) bands as many tremendous interest and activity in antenna work, and movies a turteet selection of wire and tubing antennas All drawings are large and near neking constriction
scanners now cover these frequencies antennas and related melds you can bold much easier There is no hign-level mathematics in this book, just simple equations
27' 0, es 236 :ages £95C Only when necessary to calculate the length of an antenna element or its matching

SCANNING SECRETS ARRL ANTENNA COMPENDIUM Volume Four 123

Sec1i pages £6.95
mark I rarc.n, .rIE 7,11, a::.:," II IDE EyE- jeVlifal series contains 38 menus), unpublished
Ire mysteries at monitoring explained Mince on Guying and operating your articles, covering a wide range of antenna related topics all the way horn the VAG! ANTENNA DESIGN
Wanner Where to listen and now to gather DIISCdre frequencies The myttis and malts intensive. heavy eight discussons to tun antennas to specific purposes De James L Lannon W2PV
lolklee exposed. All the information need to unlock the potential of your scanner such as a balloon supported Field Day loop This book is a polished and expanded version at a series 01 articles first published
2e0 pages £1695 For the first time in the series Mere is a disk included with the book, which contains in Hare Radio following on horn a series of lectutes by the author woo was well
source data used to model many oh the antennas In shod, Here's something to known as the expert on Yagi design Chapters include simple Tag, antennas, loop
virtually every antenna enthusiast antennas effect of graved. Stacking and practical antenna design
204 pages £1450 21C :dd.?, 6"-.71F,

BEAM ANTENNA HANDBOOK

AMATIA IR RADIO W I Orr W6S.lie 8 S D. Cowan W21 X
Design. consiructon, adjustment and installation of h I beam antennas. The Beginners (inc RAE)
Antennas & Transmission Lines information this book contains has been complied from the data obtained in
experiments condoned by the authors. and from information provided by scientists AMATEUR RADIO FOR BEGINNERS (RSGB)
25 SIMPLE AMATEUR BAND AERIALS BP125 and engmeers work,no on commercial and military antenna ranges
E M Non :FB:.,7- . e Jo Pre arr.!, : dustrab
63 pages £1 95 50
BUILD YOUR OWN SHORTWAVE ANTENNAS 2nd Edition
25 SIMPLE INDOOR AND WINDOW AERIALS BP136 .:Idaff AN INTRODUCTION TO AMATEUR RADIO 8P257
E Ai Noll This practical nandbook puts al your Imgemps the intonation you ores to cold
vJ nadn, 61 your awe se -on wave antennas Clear diagrams and pnotograpes show how to : .;:-,,sand guide
construct a variety of inexpensive antennas and masts MIDugh amateur radio topics include operating procedures. argon propagation
25 SIMPLE SHORT WAVE BROADCAST BAND AERIALS 208 nacres 14 95 and setting- up a station 150 pages £350
BP132
CUBICAL QUAD ANTENNAS 3rd Edition AN INTRODUCTION TO THE ELECTROMAGNETIC WAVE
William Orr W6SAI and Stuart Cowan W2LX (11111(11L BP315
F A Wilson
25 SIMPLE TROPICAL AND MW BAND AERIALS BP145.
E ki Noll
bo
QUAD This little cook deals elfectivey wth a einet abstract subect -
the inure

54 pages £175 fa make quad antennas :Of Panas Pewee 10 ana SOMHI
!Owes 750 1111TEME
AERIAL PROJECTS BP105
Practical temps . ferrite antennas plus accessory ar it EXPERIMENTAL ANTENNA TOPICS
96 pages £250
BP278 THE BEGINNER'S HANDBOOK OF AMATEUR RADIO
H C Wright 3rd Edition
ALL ABOUT VERTCAL ANTENNAS Experimenting with antennas is a greet way to lee, .rte w5zPv
W I Orr Maki 8 S 0 Cowan W2LX this authors approach its also infemative and enlcyac o is a good pi;e:t.cai -troDoCion to '.:Eto A yane!.,

Covers the theory design aria constructon operation of vertical antennas How to 70 pages £350 constructional OrDeCtS are included la give Ire beginner experience in design
use your tower as a vertical antenna and camel,- serene designs for restricted tri in e^ ,6'ndes ewers
locations All about loading coils and at us G-ORP CLUB ANTENNA HANDBOOK
192 pages £750 Compiled and edited by P Linsley G3POL 8 1 Nicnoison KASWRI/GWOt NO
This book is a collection of antenna and related circuits taken from Seat, the G ELECTRONICS SIMPLIFIED - CRYSTAL SET
ANTENNA EXPERIMENTER'S GUIDE ORP Clubs tunnel Although most cI the circuits are armed at the low dower CONSTRUCTION BP92
traternity many at the interesting projects are also useful for general use Not
Although wriden tar lad,o amateurs this 10c0k vii De 01 interest to anyone who intended as a text book, but offers practical and proven circuits ESOec'ai y enre, tar Mose *no wish no take pan 0- cassia [ado budding All inn
minas experimenting with antennas You only need a very basic knowledge of rade 155 pages £699 sets in the book are old designs updated witn modern cerement If is designee

64 Practical Wireless, December 1995

for all ages upwards Iran Me day when one can read intelligently and rant
Simple tools Morse
72 pages 11 75

ETI BOOK OF ELECTRONICS

PW BOOK SERVICE INTRODUCING MORSE
Dave Bradshaw
Published in association with Electromes
frifernabonal rragaziee, this book is both a reeve eel
and practical introduction to electronics It clear
rectal'

explains the theory and principals of electronics and eacr,

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MIN Operating and Handbooks
chapter includes a project for the Deemer to make Ire
protects a loudspeaker awn*. continuity tester, blown
(01202) 659930 (24 HOURS) AMATEUR RADIO TECHNIQUES RSGB
Par maynter 035A
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edition. can only be bettered by a new edition A truly excellent reference SOW,
Wirr ) oraid,rsa bras 358 pages 19 50
HOW TO PASS THE RADIO
AMATEURS' EXAMINATION (RSGB) ARRL HANDBOOK FOR RADIO AMATEURS 1995
Clue Smith 04.er,r:, srAerbaw03HB 11EWNES COMPUTER ENGINEER'S POCKET BOOK ; iC r on Of this handbook and contains the best inforrration from
The background to multiple choice exams and now to study lor them with sample Third Edition previous issues New for this edition is sane information on feedback -loop design
RAE pacer for practice plus maths revision and eow to study for the exam The Michael Tooley to power supplies, a new gel -cell charger project, updates on antenne systems and
majority of Mis book is given to sample examination papers so that candidates can new coverage of betties, propagation programs are compared and colour SSTV and
An inyaluable compendium pl laGs Tig,res. c rcu Is and data yfrrc, s
familiarise themselves outs the examination and assess thee ability leleehone FAX machines are also covered Finally Metes a new sedion on 'tor In:
indspensible to me designer. student. service engineer and all those interested in
88 pages 17 99 computer and microcomputer systems This enlarged thud edrtron covers a vast workbench with new protects tor the reader to build 1211 pages £19.95
range of subjects al a practical level, with tre appropriate explanatory text
RAE MANUAL (RSGB) ARRL OPERATING MANUAL
256 pages F12 95
G L Beriberi G3HB Another very useful ARRL book Alterenh written for the American amateur. this
Tee latest edition 01 the standard aid to studying or the Radio Amateurs PCs MADE EASY. Second Edition book yeti also be of use and interest to the UK amateur Topes covered range Iron,
Examination Updated to cover the latest revisions to lie syllabus. Takes the James L Turley short wave listening through Kerne-IawanY.reurriarr: Dir-'3' OS 1-7. saint res
candidate step-by-step through the course 684 paces f 12 95
A friendly, comprehensive introduction to every persona' computer - including Macs,
127 pages 17 99 this book is packed with valuable tips or every aspect of computer eamorogy
available today and will help you to get comfortable wth your computer - last
ARRL SPREAD SPECTRUM SOURCEBOOK
RAE REVISION NOTES (RSGB)
438 pages £1595 ',:A
rerians in the
-
AMaprnty .t 011. ..1 ..tt :ecr ique The ten
it yuu in st,,Cyrg curl Had kmale_rs i seminal -on, this beak could be useful chapters cq-ca n deschplions at !re casic Theory, :he desigi is. and the techniques
IS a summary of the salient points of the Radio Malmo' Examination Manual the nvo,ve0. and there are basic transceiver building blocks for your experimentation
standard textbook or the exam Its 05 size, and therefore can be carried with you EMC 360. pages £1450
wherever you go Easy -to -read Is divided into 13 chapters with topics like
receivers. power supplies measurements. °peat ne orozee_res liueu:e conditions INTERFERENCE HANDBOOK COMPLETE DrER
and a summary of the formulae all dealt with Bob Locher
*learn R '. ieA6F(IG
92 pages 1499 Iles book covers moment and operating techniques for the DX chaser, Porn
How to locero r I i for radio amblers, CBers Pd 8 stereo owners Types of
beginner 10 advanced Every significant aspect of DXing is covered, from
REVISION QUESTIONS FOR THE NOVICE RAE (RSGB) how to really listen. how to snatch the rare ones out of the pile-ups a e
imederence covered are soark discharge. electrostatic. potter line many 'cores' are
suggested secure that elusive OSL .2.0 204 pages ST 95
r.:4 'DI 'hi:
250:',, -
NRAE Answers are Suppled and the hook proe des a users reference source HINTS AND KINKS FOR THE RADIO AMATEUR
60 pages F5 00 THE RADIO AMATEUR'S GUIDE TO EMC (RSGB) Ethlee by Charles I c Nees in
..:

A collection of practical ideas gleamed from the pages al OS? magazine. Plenty
THE NOVICE LICENCE STUDENT'S NOTEBOOK
Mt, t I.,ii It,. It. I Jr, and
. , 'ar anyone who proects to build, rants and tips on interference. c w and operating and snippets -

John Case GW4HWR has an 1MC itetelerencer problem With :he help of the wel iustrated text and information from amateurs who've tried and tested the idea t29 pages. 18.95
This is Ole recommended course coax for anyone taking the Nonce Licence techneues. much of the mystery ham lie troublesane world of electranagnetic
Covering all aspects 01 amateur radio and electronics it would be useful to anyone compatibility is removed MARINE SSB OPERATION
starling out In amateur radio Every left fund page is for your own notes of 117 pages 17 99 J Wheel Gale
explanation How do you Slay ih Man when you sail ad eve the horzon and nto the elie-
124 pages F5 99

SHORTWAVE RADIO LISTENING FOR BEGINNERS

Anita Louise McCurmick leAtiela Historical IMpl,11,1111 fiantuie 1100 le nets # papas y Ica 95
This book provides all the rands -on information you need to get of to a quick start
m short wave listening An excellent introductory guide it describes in easy -to - 1934 OFFICIAL SHORT WAVE RADIO MANUAL MARINE VHF OPERATION
understand nontecenical terms now short wave rad:o works. available equipment J Michael Gale
and where to find it what Sla!:Of..S co be heard and l",hre',-, octane a licensed radio A his, ',or A v n I. radiotelephone s essenta, equipment la any sea -going boat. but what ra
i:; I O .' the 1934 s
:

amgew receivers. servicing adomedioo. borse. ctlonal protects. Circuits and ideas on you do wire ile Wee can you cad and eye do yee make contact') Which donne! to
176 cages 19 95 building vintage radio sets with modern parts you use and rely, whet s ne 7:media or calling another boat cal ing Me tang
2E0 pages f 1 I 60
rr,, -, r., inking a 0 -stress cale le e,I tellyou

INSTRUCTOR (RSGB)
TRAINING THE BRIGHT SPARKS OF WIRELESS (RSGB)
iu,s:1A-IrferH G R Jessop G6JP
RADIO COMMUNICATION HANDBOOK (RSGB)
Aimed at Inc Nouce licence instructor this manual prudes the syllabus and an This hardback book is well illustrated w'h some excellent photographs n pays
excellent tramertork textbook to help novece instructor and beginner alike An tribute to and takes a good lack at the personalities behind the early days of .lrar
excellent basic relerence work Ines long awaited new eCIITIUO tray Laden extensively .0 -doled and .s Ica 01 diagrams
amateur radio and the equipment they used A good read
101 pages 1650 90 pages £1250 and photographs This book is a canplete handbookfreteence work and protect
book all rolled into one. The final innovation is that the necessary to C b temPlateS
WIRT'S HELP FOR NEW HAMS (ARRL) WORLD AT THEIR FINGERTIPS (RSGB) Mr the Matured propects are provided at the ene Of Me book making them much
Doug DeMaw Vi e
This book cempreoen, ..a. tor rheinat.ng history techniques. ezeipment
, ease' ' Orr'. 0^O' oAk'OLI your 7WO Of On 750 payee F20 00
This book cowers eeerjr. np !roe: gaCry duua.bler0 .1"h new equipment to
used and personalities behind amateur radio from the very beginnings of the hobby
constructing antennas. station layout. interference and operating problems to on - to the late 1960s John Darner:ale G6CL.
SETTING UP AN AMATEUR RADIO STATION BP300
Me -air conduct and procedures
307 pages £630
155 pages 9895 tan Poole G3VWX prowees a helpful guide for anyone setting up an amateur raoio
station and covers station design construction antenna. equipmere lay -out and
the constrection and use al basic test Nur:mere, and helpful 'on the air' operating
hints. 81 pages £395

Callbooks Maps and Log Books

RADIO AMATEUR CALLBOOK INTERNATIONAL LISTINGS AMATEUR RADIO LOGBOOK IRSGB) Packet
1995

The any publication sting licesseq radio amateurs Imoughoul the world A.Su
This stanie:
out with Ire, e,
frequency, power
e. e - -- ',a; pages and is marked
e for date, time (U1C).
slalon WPOSKI/C41.1eC. reports OSL inforreatior and
PRACTICAL GUIDE TO PACKET OPERATION IN THE UK
I
Mike Maretrea G6AWD
includes ()CC Countries list Standard tine Chart beacon fists and much more remarks £3 03 Introduces the concept of packet radio to the beginner. Problem areas are discussed
Ter 110 : h- .". and suggestions made for solutions to minimise them Deals with the technica
NORTH ATLANTIC ROUTE CHART aspects provides
RADIO AMATEUR CALL BOOK NORTH AMERICAN This is a he -colour chart designed or the MC in monitoring trarsallantic !lights. oreee
ernoea-th ipackete tael'eiNseeetrhea ermiwieree,171hrrareougha 211Inffigoaerr4n 'ean95d
LISTINGS 1995 Supplied toldad
740 x 52Cmin £650 PACKET: SPEED, MORE SPEED AND APPLICATIONS .AMil
atees (including Hawaii). Also contains standard time Man. ir-r.aru u -,:e" 'eorr'e DE rr: -

census of amateur licences 01 the world world-wide OSL bureau, etc. 0TH LOCATOR MAP OF EUROPE in the tun This co:lection of artices and updates iron ARRL COMpuref Neevo,
Cner 1400 pages £20 95 This comprehensive map 01 me European :Alva, area has now teen updated and Conference Proceedings, TAPRs Packet Status Register Oa 031 and the Al,
enhanced This well tboughl out. coloured map covers from N Africa to Iceland and HanctDoot, promises an exciting ride ror some packeteers and future packerie
len Portugal in the west to Iran in the east Folds to fit into the 145 x 240mm clear Hang onto your seat and start-up your modems 144 cages f 12.95
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Computing 1080 x 680mm 15 e' YOUR GATEWAY TO PACKET RADIO

AN INTRODUCTION TO COMPUTER COMMUNICATIONS RADIO AMATEURS MAP OF THE WORLD Mid'. in packet lac,: good lur ahr: whal uses dues 0 nave for the 'average' melee r
BP177 a brightly coloured md.:. , xeS for the world and ,s What are prolocolse where why whene Lots of the most asked gunner's
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computers. modems and the telephone system Also re e . -S and RTTY 980 x 680rier F5 95
72 pages 1295 YOUR PACKET COMPANION
RECEIVING STATION LOG BOOK IRSGB)
ELECTRONIC PROJECTS FOR YOUR PC BP320 El 50 rda., , Trrralhe lengths to explain In simple terms how
R A Peelold the ratio amateur call gel going on packet hoe it works and eat the various
102 pages 13 95 systems are There are chapters dealing wan assernbtng a packet station sending
Microwaves and receiving packet mail and exploring advanced networking systems Your Packet
HOW TO MODERNISE AND REPAIR PCs AND Companion goes a Imo way to explain sane of the mysteries of packet radio
COMPATIBLES BD P2 71. ARRL UHF/MICROWAVE EXPERIMENTER'S MANUAL Cir2apc 05 95
A A PenToic Var
Recently revised, this book has seven chapels dealing with IBM PC/ATs or 'clones manual for the keen microwave entnersiast and for the budding
Starling with an overview of PCs aria hardware before deserting upgrading disks ,e,o,oliorts Iran over 20 specialist auteas Chapters cowing
video and memory Three chaplees cover repairs building a PC from bits and rrethpds and nethematics. 446 pages f 14 50 Propagation
recent developments A good grourding el PCs
166 pages f 5.95 MICROWAVE HANDBOOK RSGB AN INTRODUCTION TO RADIO WAVE PROPAGATION
W Dixom G3PFR BP293
INTERFACING PCs AND COMPATIBLES BP272 ee , each volume) 00, 1 costs f 9 99, Vol 2 and 3 cost
R A Penfold 614 99 new How does Ire sun and sunspots ailed tee propagation or the ream waves erne'
86 eagles £395 hr tee: rl ,Inc hotThrT rhe,' --shhe'rr

Practical Wireless, December 1995 65

treated differently find out how to use marts to predict rieguencies that be the intonation for the world nt radio above 31.1Hr II covets everything horn and °Dian a basic understanding 01 amateur eiectrOn<S your workshOO does nil
most profitable What effect will noise have on the signe Find out with this book oh f ./u h I radio history and theory and propagation to projects and techniques. An need to be equipped like an engineeiing lab to be successful as an experimenter
116 pages £3 95 excellent reference source. Approximately COD pages £1050 Dont let a lack of lest equipment keep you hom enjoying the thrills of
experimentation 195 pages £850
LOW PROFILE AMATEUR RADIO - OPERATING A HAM
STATION FROM ALMOST ANYWHERE (ARRL)
Jim'- Keirma, KRIS
ELECTRONICS Data
This book delves into to the techniques of hieing a hidden Ham' hem are chapters
on specialised equipment. operating techniqces and antennas to name but a lex ft 50 (FET) FIELD EFFECT TRANSISTOR PROJECTS BP39 ARRL ELECTRONICS DATA BOOK
you have a fascination for spy type radio equipment or like the idea of having a Mayer Doug DeMaw W11 6
complete i t a v !id built in a suitcase. then lt7iS Inte American book is lot you 50 circuits for the s w 1 radio arrater, eger - of audio enthusiast using Bach by popular demand, completely revised and expanded. this is a handy
I21 lets Projects include r f amplifiers and converters, test equipment and receiver reference book to the r! designer. technician, amateur and experimenter Topics
aids. tuners, receivers. mixers and tone controls 104 pages C2 95 include components and materials inductors and transformers networks Ai fitters.
SPACE RADIO HANDBOOK (RSGB) tow, and 371Peel5 a -a tisnsn-,., sin -ones 260 pages £8.95
John kiranegan GM4i1-1J A REFERENCE GUIDE TO BASIC ELECTRONICS TERMS
236 pages £1250 BP286 ELECTRON TUBE LOCATOR
rgt
M its litre suggests, tins book covers the basic terms involved in electronics and Published by Antique Electronic Supply (Arizona)
with its short. clear and precise explanations is a helpful guide and useful textbook A spire ly bound (opening flat) style book, this should prove to be of great interest
ORP for the beginner and anyone preparing for an examination 472 pages E5 95 to valve collectors. historians and anyone hying to identify particular valves. The
author provides a comprehensive list of American and British Service valveS and
G-QRP CLUB CIRCUIT HANDBOOK A REFERENCE GUIDE TO PRACTICAL ELECTRONICS civilian equivalents and the valve base details are provided, with description oi
Edited by Rev. G. Dobbs G3RJV TERMS BP1117 valve type and although Mere's no comprehensive calve character she information
This paperback book has been compile: , shed in the G-ORP Club F A. Wilson the filament yn'ta-rs and cirents are given in 0 0,02' and precise style Idea !or the
puma! Sprat from the years 1974 to 19& Essentially ins a collection of circuits A reference guide laid out in alphabetic order with an ndek, this book provides a
and projects covering everything tram receivers. transmitters. antennas and useful source for the experienced and teginner alike 431 pages F595
accessories together with sect ORP lest equipment. This book is aimed al the keen ESSENTIAL CHARACTERISTICS
constructor and provides all the information required to Wild the host of protects AUDIO ELEMENTS OF ELECTRONICS - BOOK 6 BP111 (TUBES a TRANSISTORS)
described 96 pages. £8.50 (Or g. EleCtilej
e 'ttet uy el 0 oP(Odli0O at iTio,r,,prioneS, Re punished ts., i :Kum< Supply (Arizona)
ORP CLASSICS (ARRL) loudspeakers, amplifiers, oscillators and bolt disk and magnetic recording This skit covered novel -sized paperback facscimile book is printed on good pope
Mit! 1 -'riled ose !eads, a da:-0 urixestanding of the subject without getting and is packed throughout with information, and connection details (base pin charts)
Operating ORP is liar the equipment is generally simple and easy to build. P: -sithernatios 3013 pages £395
1 on receiving valves, special purpose valves, cathode ray tubes, thytatrons, vidicons
often pedorms like more sophisticated commercial equipment Some ORP f ink; and many ciders (including semicondir.tors1 Highly recommended as a valve
Day stations operate a full 27 hours on a car battery - its the pelted equipment for BEGINNERS GUIDE TO MODERN ELECTRONIC
emergency communication when the power tails Extracts horn OST and the ARK COMPONENTS BP285.
Handbook FURTHER PRACTICAL ELECTRONICS
274 pages £9 95 Ito 0 t On covers a wide ,"Lijige. ;.:.111017e(ri currporenIS The oast functions of the CALCULATIONS 6 FORMULAE BP144
components are (*sorbed but this is not a book on electronic theory and does not
W1FB's ORP NOTEBOOK (ARRL) assume he reader has an in-depth knowledge 01 electronics it is concerned with
2nd Edition Doug De Maw W1FB Practicalities such as colour codes deciphering code numbers and suitability NEWNES PRACTICAL RF HANDBOOK
The new improved and updated 2nd edition of this book. covers the introduction to 166 pages F3 95
ORP construction methods. receivers and transmitters lot ORP This workshop - is, hedouchnin inixern r circuit design It's
an
notebook style publication. Much is packed en new designs for the keen GRP CIRCUIT SOURCE BOOK 1 - BP321 aimed at [nose learning to design r t circuitry and users of r equipment such as
operator, also covers techniques. accessories and has a small technical reference RA Pentold Innniators and owners scent,
section Written to help you create and expenment with your own electronic designs by -

175 oaten 77 95 combining and using the various standard building block circuits provided Deals
with lifters amplifiers voltage romparilors, etc 182 pages £495 PRACTICAL ELECTRONICS CALCULATIONS AND
GETTING THE MOST FROM YOUR MULTIMETER BP239 FORMULAE BP53
CIRCUIT SOURCE BOOK Z - BP322 F A it. 2.

This book is pr manly aimed e; t It covers bole analocix and digital RA. Pentad Written as . r. op manual ton the eiedrunics enthusiast. here is a strong
multi -meters and their respective All kinds of testing is explained too Complimentary to Circuit Source Book 1. helps you create and experiment with practical biav gher matemaliCS have been avnidna were possible
No previous knowledge is required assumed 102 cages. £2.95 your own electronic designs by combining and usng the various standard 'building 249 pages 7:195
black circuits prowled Covers signal generation, power supplies and digital
HANDS-ON GUIDE TO OSCILLOSCOPES electron 214 :inns FA 95 PRACTICAL ELECTRONIC DESIGN DATA BP316
Barry Ross Owen Bishop
Covers ail aspects of oscilloscope use This book is aimed at the novice and FILTER HANDBOOK - A Practical Design Guide In essence this book is a helpful collection of designer's 'building block' circuits,
assumes a mown of previous knowledge and snould be 01 use to engineers. Stetar N information connection data and bace-up ielormation complete with an index
scientists and electronic enthusiasts alike It you have an oscilloscope this book is a A indica book describing the design process as applied to fillers of all types 327 pages f495
inus' 228 :tapes 717 95 Includes practical examples and BASIC programs Topics include passive and
active fillers worked examples of tiller design, switched capacitor and switched RADIO AMATEUR AND LISTENER'S DATA HANDBOOK
HOW TO USE OSCILLOSCOPES 8 OTHER TEST resistor titers and includes a comprehensive catalogue or pre-cacu,ated tables Steve Money
EOUIPMENT BP267 195 pages f30 03 This s a unique collection of useful and intriguing data for both Inc traditional and
modern radio amateur as well as the high-tech listener. Familiar radio topics are
I 1 ideas on how to use the test equipment you have. to check out or hull
r NEWNES AUDIO AND HI-FI ENGINEER'S POCKET BOOK Covered - abbreviations and codes, symbols, formula and frequencies while the
find an electronic circuits Many diagrams or typical waveforms and circuits Second Edition newer Matures of the hobby radio world - decoding, anband maritime. packet slow
including descriptions of what waveform to expect with parhrJular faults or scan TV, etc are also dead with 240 pages £1495
r.,r s lc,011,iqw, 1practical and relevant data for anyone working on sound
sysIenis lagiu5 ouveied include microphones, gramophones, compact discs, RCA RECEIVING TUBE MANUAL
MORE ADVANCED TEST EQUIPMENT CONSTRUCTION tAcin ",ot, idr arOlit err 1n..idspeakeis and pubic address
BP249 Ire pL ddrohyr hy Arrhd..e r &ere', .. :rrupc,
Pentald This novel -Sired stilt covered paperback book is absolutely fascinating Inn anyone
A tallow an ham Test Equipment Construction 113P2481 Inis book looks a! digtal NEWNES ELECTRONICS ENGINEER'S POCKET BOOK interested in valves, In reality it's a designers handbook with potted details
nvettvcds of measuring resistance. voltage. current. cabactance and treguency Also Kern Ar noley characteristic curves information and descriptions of typical applications for each
onmed is testing sernocc,cluctors along with test gear for mneral radio reared This convenient sized volume is packed with information which everyone involved valve listed It's even got a section showing receiver circuits and applications
r. 11:2 osiess ea -h in electronics will find indisperdable This took is an invaluable compendium of
taus. figures and formulae Managers, des -piers. sluderAs and service personel
MORE ADVANCED USES OF THE MULTIMETER BP265 wilt find it useLl al al sheys vier -hones s''sSesseS 306 pages EIO 95 RCA TRANSMITTING TUBES
H A Penland {Original 1,0blisner Ratio orporathon al Amen<a)
This book is primarily intended as a follow-up to BP239. Getting Me most from POWER SUPPLY PROJECTS BP76 Re -published by Antique Electronic Supply (Arizona)
your Multi -meter By using the techniques described in this book you can test and R A Pertoli this is a still covered pacerbaclied novel -sized book And II you've got an Merest in
analyse the performance of a range of components with lust a multi mwer (plus a This book gives a number ul power supply designs including simple unstabilised transm Ling with valves this is a useful reference source for valves uo to 4kW
very few inexpensive components in some cases) The simple add-ons described types liked voltage reg., lrei tvrec yarrahlr sdlade stabilised designs input Pie RCA authors have included some interesting practical circuits using their
extend the capabilities of a multi -meter to make it even more useful 89 pages £250 valves including some for ssb.v h and others Highly recommended reference
I

96 pages F2.95 source 318 pages £995

PRACTICAL ELECTRONIC FILTERS BP299
PRACTICAL TRANSMITTERS FOR NOVICES ov.en Bishop
GW4HWR A useful introduction to the complex world of fillers and their oesign where the Projects
t.s2oii contains a seen:, racy0001u,-,0 wild', are author avoids the mathematical approach The theory of Niels their design and a
table for the UK Novice bands oncludng microwaves) Although Ire 000k is
. information on dozen or so practical projects are provided. 189 pages £4.95 COIL DESIGN AND CONSTRUCTION MANUAL BP160
ur nanly aimed at Holmes it should also interest any amateur who is building BR R.sbani 106 nag,
transmitters or the last time Chapters include Methods of construction, Amplifiers PRACTICAL ELECTRONICS
and Filters fools and how to use than and Suppliers of components and many HANDBOOK PI, NEW HOW TO DESIGN AND MAKE YOUR OWN PCBs BP121
more 126 pages NCO ;31:11:
1111 IR( , R A Pentold
'The best value handbook on eectroncs you can buy 111 \ 11W )01. The purpose at this book is to familiarise Me reader with both simple and more
TEST EQUIPMENT FOR THE RADIO AMATEUR so claims the sleeve notes of Meath edition They're nil n+nn f canfanf . 'c r is .

ve Smith G4FZH tar of the mark either The volume covers a wide ranor
Is 3rd edition, this book provides many up -dated test equipment protect designs of disc,plines These nciude passive and active discrete
or the radio amateur complete with p c b template hn the rear of Me book) Areas components c s both analogue and digital including MORE ADVANCED POWER SUPPLY PROJECTS BP192
covered include current and voltage measurements oscilloscopes frequency, r I AID and D/A Microprocessor and systems Much R

antenna and transmission one meas.rements reference eno, is ,KI..;terl A honk worthy nl Kane The. are cover,: .he deal
170 pages £900 Twice VeOrsi on regulators. dual tracxing
regulators alphes. etc 92 pages £295
TEST EQUIPMENT CONSTRUCTION
BP248. R.A.Penfold PROJECTS FOR RADIO AMATEURS AND SWLS BP304
VHF (*scut, -04 to construct some simple and inexpensive. NA extremely
useful 0.0,00 .0 lest eauiomern Shipboard layouts are provided foe all designs. I"his snail tieeit OW11010 thin Ciiillilta.00011 arT 'a' rad e Ire;;rnry ant:
ALL ABOUT VHF AMATEUR RADIO together with wiring diagrams where acproonate plus notes on then conStructiOn intermediate frequency projects, and audio frequency protects Under me first
A Orr W6SAI and use 104 pages 72 95 heading ideas include a crystal calibrator. an antenna tuning unit, a wave trap, a
hen in non -technical language, nos book provides information covering bto and other useful protects On me audio side projects include a banidpass filler
purtant aspects of v h.r. radio and tells you where you can find additional data If W1FB's DESIGN NOTEBOOK (ARRL) a by-cass switch a c wIRTIV decoder and many other math .Arras and
have a scanner youll find a lot of interesting signals in Me huge span 01 Doug DeMAW W1FB sugoe','

=
-guencies covered 100-300MHz 850.420 902 8 12501.4141 bands. this book is aimed al the non -technical amaze..' wants to build simple nippers
:13qes 70 57 BSP276HORT WAVE SUPERHET RECEIVER CONSTRUCTION

PI! =at
AN INTRODUCTION TO VHF/UHF FOR RADIO AMATEURS PA
11P281

I(
rot book to go with the new Novice or full callsign Nine chapters and an
., s.irld.x deal with all aspects and frequencies Iron 50 lo 1300MHz Topics include SIMPLE SHORT WAVE RECEIVER CONSTRUCTION
,Oagehen. descriptions of the bands, antennas receivers, transmitters and a BP275
special chapter on scanners. 102 pages. £3 50 01202) 659930 (24 HOURS)
Before discussing projects and IeCt10,Oues. the author prondes essentia,
VHF UHF MANUAL (RSGB) information on theory. propagation receiver designs and techniques Finally the
Internet orders: bookstore'a'pwpub.demon.co.uk
G R Jessop GG.IP author provides design for and descr bes Me construction of practical receivers
The 4th edition of this well known book is in paperback form Packed with 88 pages £395

66 Practical Wireless, December 1995

ENDNOTES
Radio enthusiasts I don't know about you, but I
come in many think 1995 has really 'whizzed'
'shapes and sizes', by. It certainly doesn't seem that
that's why the PW a year has gone by since I put
Editorial team the 'finishing touches' to the
decided on including a selection December 1994 issue. But there
of workshop and test equipment you are, another year gone by
features this month. Personally, and there are many more fact -
I found them all very interesting filled PWs coming your way!
and I hope you found them to be As from the January issue,
encouraging. we're dropping the 'themed'
Beginners and those approach to every month's PW. reflect on a reviewer's first rig which I took on holiday with
interested in home -brewing And although we'll have the impressions of a major item. me to Ireland recently.
have been catered for and we occasional `themed' issues with The new feature will enable Next month, as we usher into
had the special article from Ben popular subjects (such as Morse, us to get over a problem that's Volume 72 of PW we've got
Nock G4BXD. Both Ben and I and mobile), we're planning to with us all the time - trying to some interesting projects to
('digitally deprived' in different provide as much general interest evaluate equipment in a 'power you up and not leave
ways!) hope that his article will as possible. In other words, each relatively short period. With a you penniless', and get you
encourage others who perhaps PW will be packed with 'second look' a reviewer will ready for 50MHz operations!
doubt their own ability...to have 'goodies' for you, with have had time to reflect on their So, don't miss a good 'practical'
a go at home -brewing. However, antennas, projects and ideas. comments and evaluations read.
unless you want to 'pay' One new idea we're (good or bad!). And to 'kick
frequent visits to your Dentist introducing is taking a second off', so to speak, I'm intending
please remember our warnings look at major review items. to report back on the Alinco
about using your teeth! These occasional features will DX -70 h.f. plus 50MHz mobile Rob q3Xf°
available, each holding 12 issues of any
PW SERVICES similar A4 format magazine.
Alternatively, blue binders embossed
Queries:
Practical Wireless,
PW Publishing Ltd.,
with the PW logo in silver can be
supplied. The price for either type of
binder is f5.50 each (El P&P for one, £2
START
Arrowsmith Court, for two or more). Review: Tex Swann G1TEX takes a look at the Watson 2090H 80W
Station Approach, Send all orders to PW Publishing Ltd.,
Linear Amplifier.
Broadstone, FREEPOST, Arrowsmith Court, Station
Dorset BH 18 8PW. Approach, Broadstone, Dorset BH18

9
8PW.
We will always try to help readers
having difficulties with Practical
Wireless projects, but please note the
following simple rules:
Constructional Projects
1 9 6
1: We cannot deal with technical Components for PW projects are Build a Budget High Current Power Supply
queries over the telephone. usually readily available from
2: We cannot give advice on
modifications either to our designs, to
commercial radio, TV or electronic
equipment.
component suppliers. For unusual or
specialised components, a source or
sources will be quoted.
Each constructional project is given a
EARLY WITH
3: All letters asking for advice must be rating to guide readers as to the Get on 'Six' with our 50MHz antenna design
accompanied by a stamped self- complexity.
addressed envelope (or envelope plus Beginner: A project that can be tackled
IRCs for overseas readers).
4: Make sure you describe the problem
adequately, with as much detail as you
can possibly supply.
5: Only one problem per letter please.
by a beginner who is able to identify
components and handle a soldering
iron.
Intermediate: A fair degree of
experience of building radio or
electronic projects is assumed, but only
PW
A Variable utotege itegulator Project
Back Numbers basic test equipment will be needed to

Limited stocks of many issues of PW for

past years are available at £2.00 each
including post and packing. If the issue
complete any te..rts and adjustments.
Advanced: A project likely to appeal to
the experienced constructor. Access to
workshop facilities and test equipment
AND SOME
you want is not available, we can will often be required. Definitely not for And find the answer to the question "Is your coaxial cable
photocopy a specific article at a cost of the beginner to attempt without any good"?
E1.50 per article or part of article. assistance.
Over the years, PW has reviewed many
items of radio related equipment. A list
of all the available reviews and their
cost can be obtained from the Editorial
Mail Order PRACTICAL
Offices at Arrowsmith Court, Station All items from PW are available Mail DON'T MISS IT! - ON SALE DECEMBER 14 - PLACE YOUR
Approach, Broadstone, Dorset BH18 Order, either by post or using the 24hr
ORDER TODAY!
8PW for a large stamped self-addressed Mail Order Hotline (01202) 659930.
envelope. Payment should be by cheque, postal

Binders
PW can provide a choice of binders for
order, money order or credit card
(Mastercard and Visa only). All
payments must be in sterling and
overseas orders must be drawn on a
PROJECTS!
readers' use. Plain blue binders are London Clearing Bank.

Practical Wireless, December 1995 67

 YOUR LOCAL DEALERS
SURREY MID GLAMORGAN YORKSHIRE YA F. RU LONDON
Chris Rees SANDPIPER
G3TUX COMMUNICATIONS
?COM
Locate
Kenwood
The QRP Component Company Unit 5, Enterprise House, Cwmbach Communications Ltd
PO Box 88 HasImbue Surrey GU27 2RF
Tel: (01428)641771
Industrial Estate, Aberdare,
Mid Glamorgan CF44 OAF
Alan Hooker 23 BOUSHELD ROAD, NEW CROSS,
LONDON SE I4 5TP
Fax: (01428)661794 Tel: (01685) 870425
Radio Communications Independent Radio Engineers
Stockists of: Fax:101685) 876104 42, Netherhall Road, Doncaster We can maimain any of the followIng system, amateur
ratio: equipment. mobile radio systems and IBM PC/Clone
/ Howes Kits / Jones Keys A full range of transmitting & receiving Tel: (01302) 325690 computers
Vargarda Aerials antennas available for the amateur Open Mon -Sat 10-5 pm Tel: 0171-732 8319
st Bits n'pieces! ft) Lists commercial market. Closed Thursdays Fax: 0171-652 5796

KENT SCOTLAND KENT El= SCOTLAND

WANTED
We BUY and SELL quality used
JAYCEE KANGA PRODUCTS TENNAMAST
Amateur Radio's ELECTRONICS LTD For QRP kits SCOTLAND
Send an SAE for our list or telephone for 20 Woodside Way, Gknrothes, Fife K1'7 5IW
a quote on your unwanted equipment. A variety of kits for RECEIVERS, Masts from 25ft 40ft
Tel: (01592) 756962 I Day or Night'
COLIIDTWRI & DFIJVFRY srionrr AVDIABLE Fax No. (015921610451
TRANSMITTERS & TEST GEAR.
Adapt -A -Mast
KP Trading, Seaview House Open. Tues.1-ri 9-5: Sat 9.4 Send an A5 .SAE. feu a free copy rjour catalogue

Crete Road East, Folkestone CTI8 7EG KENWOOD. YAESU & KOH APPROVED DEALERS Stamen Hoose.Erete Road East

Tel Lis 1)1303 891106 .1 good stock of new and secondhand Folkestone. CTI8 7E0 (01505) 503824
rKP In,. A, 5r, t PROM/Mr equipment always in stock Tr18611113111191116 MO IWO* 11 Mains Road. Ayrshlre. KA 15 MT

NORTHWEST AVON/SOMERSET SOUTHAMPTON

ARC Ltd. C. B.RETAIL

RADIO QSL SMC Ltd
Everything for the radio SEND LARGE STAMPED ADDRESSED COMMUNICATIONS Main Dealer for: Yaesu,
ENVELOPE FOR INFORMATION
amateur under one roof! OR £2.99 FOR CATALOGUE We stock all makes of equipment Kenwood, Icom AOR &
36 Bridge Street, Earlestown, TRADE for the Amateur and listener. Cushcraft
Newton -le -Willows, MANUFACTURERSAMPORTERS OF Part Exchange Welcome SM House, School Close, Chandlers Ford
ALL MOONRAKER PRODUCTS
Merseyside WA12 9BA
Tel: 01925 229881
MADE ENOurAWS WELCOME
alOOPIRAKER WI LTD, UNIT 112.1-1
CRaalf it LD ROAD UNITS. CRANFIELD ROAD.
Unit 6 Worlc Indumnal Centre, Coker Road.
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Industrial Estate, F.astleigh,
Hampshire SO5 3BY
Tel: (01703) 255111
Fax: 01925 229882 WOBURN SANDS. BUCKS OAK 1 T SOR
TEL (01908) 281705 FAX (019811) 281706 Tel/Fax: (01934) 512757 Fax: (01703) 263507)

LONDON DEVON DERBYSHIRE

To advertise
viART I N LYNCH Reg. Ward & Co. Ltd. WORLD RADIO CENTRE
GIRLS Shortwave, VHF & UHF receivers from -
The South -West's largest amateur radio stock- AOR, YUPITERU, DRAKE, ICOM,
For all your amateur radio needs ist. Approved dealer for Kenwtaxl, Yaesu and LO%VE...
140-142 Northfield Avenue Icom
Ealing London W13 9S11 ADAM BEDE HIGH TECH CENTRE
Tel:
I Western Parade,
West Street, Axminster,
DERBY ROAD LYNN
0181-566 1120 WIRKSWORTH
Devon, EX13 SNY DERBYSHIRE DE4 4BG o0
Fax: Tel: (01297) 34918
0181-566 1207 (Closed i.00.2.00 and all day Monday )
TEL: (01629) 825926
(MONDAY - FRIDAY 9 30AM - 5.00PW
01202 659920

Index to Advertisers
AH Supplies 52 Icom UK cover iii RSGB 52
AKD 47 Interconnections 47 Short Wave Magazine 4

AOR 21 J & P Electronics 51 SMC Ltd 2/3

ARC Ltd 39 J. Birkett 52 SRP Trading 8
Castle Electronics 51 Lake Electronics 52 Suredata 61

Cirkit 21 Langrex Supplies 51 Thames Valley Rally 61

Coastal Comms 39 Lentini Comms 61 The Short Wave Shop 8

Colomor 61 Lowe Electronics 6/7 Venus Electronics 51

Cricklewood Electronics 51 Maplin cover iv Verulam Amateur Radio Rally 47

Essex Amateur Radio Services29 Martin Lynch 34/35 Waters & Stanton 5

Haydon Comms 14/15 RAS Notts 52 Yaesu UK cover ii

Howes,CM 4 Remote Imaging Group 61

68 Practical Wireless, December 1995

 a

M11

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The IC -W performance and
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ICOM manufacture a full range of base -stations, mobiles and handheld

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Or order direct NOW on 01702 554161
Catalogue Mail order Price £3.45 (inc p&p). Prices refer to the 1996 Maplin Catalogue and are inclusive of VAT.
All items are subject to availability. E&OE. Maplin Electronics, P.O. Box 3, Rayleigh, Essex, England SS6 8LR.