VOLUME 13 PUBLISHED MARCH.

1982

BY VIC RICHTER PRICE $19.95

www.hardtlmez99.com
 IMPORTANT: READ THIS FIRST
The information in this book is not to be used to exceed F.C.C. specifications, in any case, as
applied to power, modulation, frequency spectrum, etc. It is illegal to do this to any CLASS D RADIO.

This book Is a factual report of gathered information, and as such is intended for use on radios for
EXPORT ONLY.

If you are not familiar with electronics, it is better to check for advice with your local electronics or
CB center, as to restrictions, etc., concerning your radio.

More information, on other units will be forthcoming in future issues, to be published on a quarterly
basis.

This book will not be found at a book store, but can be obtained through your local CB Dealer or
Distributor, or by completing the order form in this book.

Secret CB
Volume Thirteen
Published March 1982

©Copyright 1982, Dane D. Selman

All rights reserved. No part of this book shall be
reproduced, stored In a retrieval system, or transmitted by
any means, electronic, mechanical, photocopying, recording,
or otherwise, without written permission from the publisher.
No patent liability is assumed with respect to the use of the
information contained herein. While every precaution has
been taken In the preparation of this book, the publisher
assumes no reponsibility for errors or omissions. Neither is
any liability assumed for damages resulting from the use of
the information contained herein.

PRINTED IN THE UNITED STATES OF AMERCIA

New issues quarterly

Address any and all inquiries to:

Selman Enterprises, Inc.

P. O. Box 8189
Corpus Christi, Texas 78412

(512) 992-1303

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 ACKNOWLEDGEMENTS

SECRET CB wishes to gratefully acknowledge the following people

FOR THEIR HELP AND CONTRIBUTIONS TOWARD GETTING VOLUME 13 IN

print. Their encouragement and contribution of material has been

INVALUABLE.

WAnTGD
NEW MODIFICATIONS
E. R. Gendreau NEW CONVERSIONS

Lester R. Jernigan TECHNICAL TIPS

PROJECT PLANS
Bob Leverich
ETC. ETC. ETC.
David Litterer
D, W. Powers
Mike Stephens
James Vaughan
C. R. Waggoner
Bill Wentz

VIC says "THANKS” and

a free book to the above
people
i

.hardtlmez99.
 INTRODUCTION

Here we are at our "LUCKY 13" edition and this time we are
featuring a new import, the SOMMERKAMP TS-788DX. See the
feature story for full details. I'm sure you will be impressed.

Our FM Kit is now available. It comes with instructions on

how to add an AM/FM selector switch for either mode of operation.
It will work on any set that has a V.C.O. and a 455KC intermediate
frequency (I.F.). It is also relatively easy to install.

We have a new thumbwheel conversion for the 858 SSB chassis

which reads the output frequency directly off the switches. No
more charts. Also we are currently working on a compact 6 digit
programmable frequency counter/display which is adaptable to any
unit. Watch for this one - it will be hot!!!!!!!!!!!

Looks like there will be no more CB schematics published by

SAMS. We maintain a file of schematics on anything we can get our
hands on. If you have a schematic of a hard to find unit, send us.
a good photocopy of it. We will function as a Clearinghouse and
supply a schematic of anything we have on file (which is not copy
righted, of course) for a nominal copying/shipping/handling fee.

For anyone with a "parts supply" problem, we have a modest

inventory of popular values of resistors, capacitors, switches, etc
Call us at 512-992-1303 for prices and special requirements.
Phone orders are accepted Mon.-Fri. 9AM-6PM CST.

Till Next Time,

www.hardtlmez99.com
 TABLE OF CONTENTS
PAGE #

ACKNOWLEDGEMENTS............................................ 1
INTRODUCTION................................................. 2
TABLE OF CONTENTS........................................... 3
INTRODUCING THE SOMMERKAMP TS-788DX...................... 4-9
CONVERSIONS:
CENTURIAN 4 0D SSB MODULATION INCREASE................ 10
FANON FANFARE 350F - 858 CHIP.......................... 11-12
J.C. PENNEY 981-6247 CLARIFIER......................... 13
J.C. PENNEY 6248 - ADD VARIABLE TRANSMIT F ......... 14-15
PANASONIC RJ-3700 - SM5104G................ ?.......... 16-17
PRESIDENT ADAMS - 858................................... 18-20
PRESIDENT GRANT - 8719.................................. 21-22
ROYCE 1-6 32............................................... 23
ROYCE 642 - CCI 3001.................................... 24
SOMMERKAMP TS-788DX..................................... 25-30
TRAM D64 - NDC40013 PLL................................. 31
MB8719 PINOUT................................................ 32
ANOTHER MB8719 MODIFICATION............................ 33
RECEIVER WIDEBANDING FOR 858 CHASSIS..................... 34
NEW THUMBWHEEL CONVERSION FOR 858 CHASSIS............... 35-37
AGC SELECTOR SWITCH......................................... 38
CYBERNET 02A CHASSIS ....................................... 39
HOW TO HOOK UP A 10T POT TO 2000GTL...................... 40
2824C OPERATION ANALYSIS................................... 41-43
VSB-1 HOOK UP FOR TRC4 4 8................................... 43
VSB-1 HOOK UP FOR MIDLAND 77-0004 4001................... 44
TROUBLESHOOTING CLARIFIER PROBLEMS ON THE 858.......... 4 5-47
SUPER REGULATOR.............................................. 48
BUILD A RECEIVER PREAMP..................... ,............. 49
LINEAR NOTES................................................. 50-51
MODULATED GUNN OSCILLATOR.................................. 52-56
HOW TO ADD SLIDE TO YOUR COBRA 29GTL..................... 57
BOWMAN 910 (02A) CONVERSION................................ 58
SPECIFIC RADIO TUNE-UPS & AM CONVERSIONS:
COBRA 29LTD............................................... 59
Cybernet 02A AM RADIOS.................................. 59
GEMTRONICS GTX 5000 & ROBYN T240D.................... 60
ITT CB-4000M............. »............................... 61
J.C. PENNEY 6246 (PLL6055)............................. 61
JOHNSON 4125/4174........................................ 61
MIDLAND 13-882C (02A)................................... 62
MIDLAND 13-867........................................... 62
PEARCE-SIMPSON PUMA 2 3B................................. 62
ROBYN T240D............................................... 63
SHARK 23.................................................. 63
STANDARD 29A uPD857..................................... 63
REALISTIC DX300 (20-204)................................... 64
BEARCAT 250.................................. 65
OOPS, WE GOOFED:
VOL. 4, PAGE 39.......................... 66
VOL. 6, PAGE 3 & 12..................... 66
VOL. 7, PAGE 54.......................... 66
VOL. 10, PAGE 25 & 48................... 66-67
VOL. 11, PAGE 4, 6, 10, 41, & 75...... 67
INDEX VOLUMES 1 THRU 12............... 68-80
SECRET CB ORDER FORM........................................ 80

¿WA7A ihlò fl
 PRESS TO TALK CIRCUIT PROTECTION LAMP(underneath)
BUTTON MICROPHONE RF POWER,VSWR &
MOBILE "S” METER
BRACKET DOWN COUNT UP COUNT
LAMP LAMP
FREQUENCY
FIGURE AND
CW SWITCH

POWER
ON-OFF
SWITCH

MODE
SELECT
SWITCH

SQUELCH ADJUSTMENT
VOLUME KNOB KNOB FREQUENCY
RIT —SELECTOR
One Year Warranty KNOB FREQUENCY DISPLAY KNOB

GENERAL:
1. Semiconductors 31 IC's, 41 Transistors, 2 FET’s & 119 Diodes.
2. Frequency Range 28.000-29.999MHz

W'
3. Modes of Operation AM, FM, LSB. USB & CW
4. Speaker Dynamic type, 8 ohm.
5. Microphone Ceramic type
6. Power Supply 11V— 16V DC, negative ground.
7. Antenna Impedance 50 ohm.
8. Size 61X 156X290mm

RECEIVER:
1. Receiver System Single Conversion PLL Superheterodyne.
AM ................. 0.75//V
SOMMERKAMP
2. Sensitivity at S/N lOdB
FM ................. O.75//V MODEL: TS-788DX
SSB................. 0.25^V
3. Selectivity AM ................. 6KHz at Bandwidth - 6dB.
FM ................. 6KHz 60dB down at 8 KHz
10 METER
SSB................. 2.4KHzat Bandwidth - 6dB
4. AGC Figure of Range 80dB. 60dB down at 4.8KHz
5. Squelch Range I^V-IOO^V.
6. Audio Output Power 2.5 Watts
7. Spurious Response -60dB.
8. I.F. 10.7MHz.

FM TRANSMITTER: SSB TRANSMITTER:

1. RF Output Power (max) 50 Watts 1. RF Output Power (max) : 50 Watts PEP
2. Deviation ±1.5KHz. 2. Carrier Suppression : More than 50dB.
3. Harmonic Suppression More than 60dB. 3. Unwanted Sideband Suppression More than 60dB.
4. Harmonic Suppression : More than 60dB.
AM TRANSMITTER:
1. RF Output Power 25 watts carrier
2. Modulation Capability More than 80%
3. Harmonic Suppression More than 50dB.

www.hardtlmez99.com
 INTRODUCING THE
SOMMERKAMP 10 METER TS-788DX
The SOMMERKAMP TS-788DX transceiver has been designed for

continuous heavy duty mobile and base station application on

AM, FM, LSB, USB and CW. The best feature of this unit is the

continuous coverage of the entire 28.000 - 29.999 MHz. band.

This is accomplished by using the frequency selector knob in

conjunction with the frequency figure switch. You can select

100KC, 10KC, 1KC or 100Hz. steps. The 5 digit frequency counter

displays the results.

Another special feature is the remote control microphone. Up

and Down pushbutton switches on the top of the mike select the

frequency and scanner functions. On the side are two pots, one

is for the Volume and the other is the Clarifier. The PTT button

is on the opposite side. On the rear of the mike is a recessed

slide switch which selects internal or Mic Speaker. The mike

plug is an 8 pin locking-ring type. This transceiver is designed

to operate on 13.8 VDC and draws 8.5-10 amps. Use a regulated

heavy duty power supply for base station operation.

The receiver section will receive AM/A3, FM/F3, SSB/A3J and

CW/A1 signals in the 28.000 to 29.999 MHz band. The unique

combination of low noise FET1s, ceramic and crystal filters,

efficient noise limiter (ANL) and a HI-FI quality audio am­

plifier results in exceptional reception quality. The latest

advances in solid state technology have been incorporated into

this unit resulting in superb sensitivity and unwanted signal

SOMMERKAMP TS-788DX (Cont'd.)

rejection and noise suppression available previously only in

space and military communications equipment. The power supply

of the receiver RF, IF and Oscillator section is stabilized by

an extreme sharp cut-off Zener diode to obtain the high sensi­

tivity and unwanted signal rejection. The efficient series gate

noise limiter, which virtually cuts off the audio output during

ignition noise pulses, is defeatable to make even the weakest

signal audible which otherwise would be cut off by the threshold

level of the ANL switching diode. The high squelch sensitivity

is achieved by using a separate squelch detector and switching

circuit with a carefully balanced hysteresis. The audio amplifier

is of transformerless design and will drive any load between 8

ohms and indefinite,such as,internal speaker or external speaker/

microphone or headset combinations. An automatic tuning circuit

automatically tunes to the best reception on the entire band.

The transmitter section is designed for continuous heavy trans­

mission on either AM/A3, FM/F3, SSB/A3J and CW/A1 signal in the

28.000 - 29.999 MHz. band. The transmitter consists of a Phased-

Locked Loop circuit and one crystal controlled oscillator. The

output is .synthesized in a balanced mixer followed by a double

tuned filter, class ABI buffers, auto-tune circuit and power

output stage, coupled by series and pi-matching filters to the

antenna jack. Output power can be varied. If both Volume and

RIT knobs are pulled out, you will be pushing about 10W PEP.

Any other combination of these two knobs will give full output
SOMMERKAMP TS-788DX (Cont'd.)

power of about 50W PEP. A VSWR protection circuit disables the

transmitter so it cannot be damaged by bad antennas, shorted

coax, etc. A lamp behind the Frequency Selector Knob alerts

you when this situation arises. It is reset by momentarily

switching the transceiver off.

The Modulator consists of an input audio filter, pre-amplifier,

ALC amplifier, and audio buffer followed by a balanced modulator

for AM/SSB, or directly to the VCO for FM. The input circuit has

been designed for a 500 ohm dynamic microphone, a 1000 ohm ceramic

microphone or a 32 ohm speaker/microphone combination with a

100 ohm resistor in series.

On all new models the SQUELCH Control pulls out to perform

another function. This gives a 100KC offset for repeater use,

a very nice function.

A matching 10 amp continuous/15 amp surge power supply with a

built-in base speaker is now available. It is 5" high and has a

black face with matching blue side panels. Pushbutton terminals

are provided for quick power hookup. A separate cable with a

miniature plug on the end plugs into the transciever SP jack for

base speaker operation. This mades a really sharp base station

set up.

The manual accompanying the unit is also of high quality in­

cluding schematics, parts layout, wiring layout, voltage charts,

parts list, etc..

www.hardtlmez99.com
SOMMERKAMP TS-788DX (Cont'd.)

BLOCK DIAGRAM

www.hardtlmez99.com
SOMMERKAMP TS-788DX (Cont'd.)

The "guts" of the unit is built on two pc boards sandwich

together with the component sides up on top and bottom. The high

power RF linear is attached to the rear of the unit in its own

shielded compartment box with a generous amount of finned anod­

ized aluminum heatsink. It uses an MRF454 to generate the high

power output. A 2SC1306 transistor is used as the driver and a

2SC2098 is used as the power amp to drive the MRF454 Linear amp.

THIS UNIT IS EASY TO OPERATE AND A JOY TO USE. ORDER YOURS

TODAY FROM SELMAN ENTERPRISES, INC. OR YOUR FAVORITE SECRET CB
DEALER OR DISTRIBUTOR.

www.hardtlmez99.com
 CENTIIRIAN AOD SSB
MODULATION INCREASE

1. Remove R606 (1OK).

2. Remove R607 (100K).
3. Remove RT601 (1OOK Trimmer).
4. Remove R608 (10K).
5. Remove D601 and install a solid wire jumper in its place.
6. Remove D602 and install a solid wire jumper in its place.
7. Remove R610 and install a 50K Trimmer Resistorin its place.
Adjust for 3VDC on base of TR602.

NOTE: R610 was 56K. with pot adjusted, R=16K.

10

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 FANON FANFARE 35OF 858 CHIP

SLIDER:

1. Clip D24.

2. Lift end of R61 opposite R60.

3. Solder a wire onto the lifted end of R61.

4. Solder the other end to cathode of D32 zener.

This supplies 9 volts to the clarifier.

5. Remove D26 zener and discard.

6. Replace D26 above with an 8.2V zener.

7. Locate Orange wire on clarifier.

8. Cut Orange wire loose from pc board and ground it.

9. Remove R28 (4.7K) and replace with a IK.

FANON FANFARE 350F 858 CHIP cont'd.:

WIDEBANDING:

Do the following mod. to T10 on the foil side of pc board

RX ADJ :

Peak T4,T3,T5,T6,T7,T2,T1 .

VR15 A.G.C.

V R3 Local Adjustment.

V R2 Squelch Range.

V R1 S Meter.

TX ADJ:

Peak T13,T10,LI0,L7.

V R6 AM Power Adj.

V R8 AMC Adj.

V R4 Carrier Null.

V R7 SSB ALC.

V R9 RF Power Meter.

12

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 J,C,PENNEY 981-6247 CLARIFIER

1. Clip R24.

2. Clip D5.

3. Remove D4 and install a solid wire jumper in itsplace.

4. The value of C17can be alteredslightly for more slide.

5. Solder one end of an Orange wire to the unused end of the

Fine Tune control.

6. Solder the other end to the emitter of Q44 voltage Regulator.

7. Add a 47ufd/25V Electrolytic Capacitor on the Fine Tune con­

trol. Solder the + lead to the Orange wire (added above) and
the - lead to the Black lead.

13
 ADD VARIABLE TRANSMIT Fo TO J.C.PENNEY 6248

Follow these steps carefully.

1. Clip D710.

2. Remove R711 and install a solid wire jumper in its place.

3. With a voltmeter, measure the voltage on both ends of the

Fine Tune control. One end should be OV and the other
end 8V. Follow the wire which is connected to the 8V
line and cut this wire into at the plug, HP1.

4. Resolder the end of this wire to pin 2 of 1C502.

V * J/ BOTTOM VIEW

5. D702 may be replaced with Super Diode or use Super Slide

in series with stock varactor.

TUNE UP TX:

RT301; AM Power
RT401; RF Power Meter Adj.
RT402; SSB Power Control.
Clip D302 for max. mod.
Adjust T402, T403, T404, T405, T406, T407.

RX:
Adjust T102, T103, T104, T105, T106
RT104; S Meter, AM
RT105; S Meter, SSB
RT102; AM SQ.
RT103; SSB SQ.
T702; is VCO Coil.

* See Vol. 8 Page 24 for Frequency Expansion.

www.hardtlmez99.com
PANASONIC RJ-3700 SM5104G cont'd.

CLARIFIER:

Quick & Easy!

Refer to Drawing:

1. Jumper 1 to 3.
2. Cut trace at 2 or remove wire going to D44-R143.

TUNE-UP:

R189 AM Power; R192 ALC; R129 AM Mod

R56 RF Meter; R44 Mod. light
R78-Squelch
R77-S Meter

FREQUENCY-CHANNEL NUMBER CHARTS

•
Frequency Channel Frequency Channel Frequency Channel Frequency Channel
26.965 MHz 1 27.085 MHz 11 27.215 MHz 21 27.315 MHz 31
26.975 MHz 2 27.105 MHz 12 27.225 MHz 22 27.325 MHz 32
26.985 MHz 3 27.115 MHz 13 27.255 MHz 23 27.335 MHz 33
27.005 MHz 4 27.125 MHz 14 27.235 MHz 24 27.345 MHz 34
27.015 MHz 5 27.135 MHz 15 27.245 MHz 25 27.355 MHz 35
27.025 MHz 6 27.155 MHz 16 27.265 MHz 26 27.365 MHz 36
27.035 MHz 7 27.165 MHz 17 27.275 MHz 27 27.375 MHz 37
27.055 MHz 8 27.175 MHz 18 27.285 MHz 28 27.385 MHz 38
27.065 MHz 9 27.185 MHz 19 27.295 MHz 29 27.395 MHz 39
27.075 MHz 10 27.205 MHz 20 27.305 MHz 30 27.405 MHz 40

17
 PRESIDENT ADAMS (858)

The Adams frequency conversion is slightly different due to the

SCAN feature incorporated into the chip program select lines. Unlike
the others, this one switches the address lines to ground and the
normal pin status is +5V supplied through 100K resistors. It does
not have the 4700 ohm resistors from each pin to ground. D708 (14),
D710 (15), D712 (16), D714 (17), D716 (18), D718 (20) make up the
"Channel 9" monitor. When pin 2 of IC702 goes low, address lines
20, 18, 17, 16, 15, and 14 (19 is low also because it is grounded-
more on this in a minute) go low leaving 13 and 21 high which is the
code for channel 9. Pin 14 controls another diode matrix which has
jumper wires for field programming. It is factory encoded for channel
19, but is easily field programmable to whatever frequency you want
(Home Channel-more on this later).

FOLLOW THESE STEPS:

1. Locate pin 19 of the 858 chip and isolate by cutting PC foil

away from ground. An XACTO knife with #11 blade works perfect.

2. Obtain two IN914 diodes and twist the anodes together. Wrap
this around one end of a 100K/^W resistor and .01/50V disc
capacitor. It should look like this:

TO PIN 2
OF IC702

TO PIN 23-GROUND

Solder the four leads together and then solder it to pin 19.

FIG. 1

18

www.hardtlmez99.com
PRESIDENT ADAMS 858 cont'd.

3. Solder the other end of the capacitor to ground (pin 23).

4. Solder the free end of one diode to the cathodes of channel

9 encoder diodes or pin 2 of IC 702.

5. Solder the free end of the 100K resistor to pin 1 of RR701

resistor network (5.99V source) or cathode of zener D722.

6. Obtain a SPST switch and ground the center terminal. Run a

wire from the end terminal to the free end of the remaining
diode. It should look like this:

D708
D710
D712
D7W
D716
D718

to pin 2 of IC 702

FIG. 2

7. Solder the anode of a 1N914 diode to Pin 20 and the

cathode to another SPST switch like this:
r>

PRESIDENT ADAMS 858 cont’d.

8. Cut the trace on pin 21 between the cathode of D410 and the
channel selector switch. Add a SPST switch and wire like
this:

The three SPST Switches must be in the "OFF" position for the
SCAN Function to operate normally. This modification gives hi
and low channels.
Now lets discuss the programmable "home channel" function.
To program a "home channel" of 27.605, we need a jumper at JP702,
JP704, JP706 and JP707, since pins 14, 16, 18 and 20 are low and
pins 13, 15, 17, 19 and 21 are high. All you need to know to
program your particular "home channel" is the truth table for
that channel and then install jumpers wherever you need a low or
0. Consult Volume 11 for truth table. This is a great radio.
Have fun with it.

Engineered to be the very best.

 PRESIDENT GRANT (8719)

How to put extra channels on ANL/NB and Brite/Dim Switches.

ANL/NB Procedure

2. Clip Red wire at hole 8.

3. Resolder Red wire at Blue wire, hole #6.

4. Clip Red and White wires at holes 10 and 11.

5. Clip shield at hole #9 and remove this complete cable.

Brite/Dim Procedure

6. Clip Red wire @#4 hole.

7. Connect end of Red wire to ground.

8. Clip White wire at hole #3 and terminate.

9. Clip R418 Resistor next to Dim Switch.

Hook up new wires as shown in the following diagram.

Grant
MODEL 1005002
40-Channel AM/SSB Mobile

21
PRESIDENT GRANT (8719) cont'd.

RH’8

E>1AA ANU
SMTCH
çuirrcw

Here are the frequency combinations:

DIM-NB 26.815 to 27.005 (Lows).
DIM-ANL 27.455 to 27.725 (Intermediate).
BRITE-NB Normal.
BRITE-ANL 27.605 to 28.045 (Highs).

Now the meter light and channel LED's will always be on bright and
NB is always on.
This makes a neat frequency conversion without using extra "tattle
tale" switches and offers front panel convience and driving safety.

Engineered (o be (lie very best.

 ROYCE 1-632

FREQUENCY EXPANSION:

1. Locate the PLL Unit and remove.

2. Remove the cover of the PLL unit.

3. Locate the 12.063 MHz crystal and remove it.

4. Replace the crystal with a 12.503MHz.

5. Locate M58473P PLL IC and connect a switch as follows:

, TO Plfi I *+
♦TO GftoHMD

6. For a 15KC Slide, replace the varactor with our Super

Diode (located next to crystal. )

7. Reinstall the PÎL unit.

For other channels and clarifier information see Volume 11 page

21.

********************************************************i4^^^iiJti^^

Write for a copy of our FREE CATALOG! We accept VISA/MC.

23
 ROYCE 642 (CCI 3001)
FREQUENCY EXPANSION - UP TO 27.595

1. Cut the trace between collector of Q23 and pin 4 of IC8.

2. Cut trace between channel selector and pin 11 of IC9.

3. Cut trace between channel selector and pin 12 of IC9.

4. Wire two SPST Switches as shown:

CLARIFIER:

1. Cut Green wire (from clarifier) at board (62) near D8

(located between T2 and T9). Ground this wire.

2. Cut White wire (from clarifier) at board (68) near D9

(located between T1 and Relay).

3. Solder one end of a 10K variable resistor to the emitter

of Q18 (87). Solder other end to ground.

4. Solder the White wire to the wiper. Adjust pot for most
"up" slide without "dropout".
LIO is VCO; D19 is VCO Varactor.
D13 is Varactor. A super slider can be connected in
series with D13 or D13 may be replaced with a Super Diode.

XMTR TUNE UP:

VR11 is SSB ALC.

VR7 is AM AMC (or remove Q16).
Peak T8, L4, L3, L2, T9, L12.

www.hardtlmez99.com
 SPECIAL REPORT

SOMMERKAMP TS-7S8DX MODIFICATION

Another exciting feature of the Sommerkamp TS-788DX is its easy

conversion down to 26.000MHz. The following steps will show
you how:

1. Remove the covers.

2. Turn the unit up-side-down to locate the jumper points
in the next steps.
3. There is a jumper near IC20 to IC21. Unsolder to remove
it. It will no longer be needed. This is labeled D & E
on the photo.

4. Locate the jumper near IC14. Unsolder the end of the

jumper nearest IC14 at point B and resolder to point C
(pins 12 & 13 of IC14). Normally the jumper is between
A and B. Move it to A and C as shown below. Also ref­
erence to the photo. NOTE: When I soldered the jumper
to C it was not making contact with pins 12 & 13, rather
than lift the whole board I was able to heat pins 12 & 13
to get contact. USE CAUTION! An Ohmmeter may be used to
check for an open from C to pin 12 & 13.

Tcl*f

aWW'iA il-li* fl I lity^A^X il

26
SOMMERKAMP TS-788DX MODIFICATION cont'd.

5. Connect the GREEN wire to the pad (labeled F) closest

to IC15. Refer to the photo for exact location.

TUNE-UP :
VR20 AM power
located inside RF Power Unit
VR21 FM-CW—SSB power
L8, L9, LIO, L12, L14, TC4 - peak for maximum power with
good forward drive and frequency coverage.

Actual output power as measured on our test unit was:

AM: 30W dead key, 45W with tone
SSB: 45W PEP
FM: 58W

NOTE: Counting down from 29.999 to 26.000 and back to 29.999

was fine. When the counter was advanced forward from 29.999
the display should read 26.000. It did not - it jumped to 24.
To eliminate this glitch add a .1 ufd bypass capacitor on
pin 14 of IC14 to pin 8 (ground) of IC14.

When power is removed from unit to disable memory, unit will

go to 26.000 when turned to on. When turned to "ch. 9", unit
will go to 26.500. If you would like "ch. 9" to read 27.505,
add a 1N60 and a jumper to the points shown below:

www.hardtlmez99.com
SOMMERKAMP TS-788DX MODIFICATION cont'd

COMPLETE PARTS LAYOUT

VR17 18
JI

L24

TC4 VR2O

121
L22 VR21

C238
L23

TC9

C501

VR25 X4
C500
127 L26 OC503
C315 IC25 TR43
TC5
TR33 TR46
L3° TR35 C300 VR26
TC6
TR45
TR36 1^^128 C274
129 IC26 IC29
C322OTR3P ,VR2‘
TC7 VR23

VR27

TR31
IC27

C3O6

C292

TR3O
C289 IC 13 IC12 ich ICIO C357

VR31

J2

vH2
VR22
SW3A-G PU VR3

28

www.hardtlmez99.com
 J3 VR17.18 SW9

L12
TR18 114 L16
TR20
117

LIS

TR17 C212

vR15 TR2
TR1 L2
'.9
14
TR26
C257 TR24
IC9
TR3 IC1 C259

CD C162
C359 TR22
TR25
C131
VR9 TR9
C163 VR7 C27O
O0TR14 XF1 XF2
VR11 VR10
• W
VR13
CIS C'6' TR5
C37
TC3 TC2 TCI
C157
IC8
C101 L6
TR12

TR6
061
TR7
C73
C61
C130
VR4 TRH
TR8
TRIO C71 C78
C118^OC111

J2

VR6
M1 SW12 SW8A-B

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SOMMERKAMP TS-788DX MODIFICATION cont'd.

RIT Clarifier System:

The T/R frequency is variable between 26.000-29.999 MHz in 100

hertz increments. For this reason we felt no need to "open" the
RIT circuit for variable transmit F . This will prevent "walking
around the dial" since transmit is rock steady where set. Receiver
can then be fine tuned right on the money. If every unit had this
capability there would be no need to open any clarifier, since the
purpose is to allow one to slide down a KC or two for a clear
channel space. This would cure 99% of clarifier problems.

There is no need for a great amount of slide because the fre­

quency is variable in 100 Hz steps which is great, because this is
derived from highly accurate dividers and PLL locked. Theoretically
all you would need is a * 100 hertz slide capability. However, in

the event that the station you are talking with has a shift of 600
hertz between transmit and receive you would encounter a problem.
But don't worry, SOMMERKAMP engineers have designed 2 KC of fre­
quency offset to take care of that problem.

With the RIT control in the OFF position receiver and transmitter
are locked together. The frequency display is just that - a display,
not a true frequency counter. The front panel VXO adjustment is used
to adjust the RIT frequency to agree with the display. We found the
actual and displayed frequency to vary a maximum of 970 cycles.

All things considered, this unit is a good buy for the money.

WE TAKE PHONE ORDERS OR SHIP C.O.D.

 TRAM D6A NDC40013 PLL
FREQUENCY CONVERSION-See Vol. 11,page 12-for Johnson 4740.

CLARIFIER:

1. Clip CR107 located close to relay.

2. Clip RED Wire(Located on Clarifier) at PC board.

3. Resolder to 9V Source 0 emitter of Q101.

4. Remove C929 capacitor which is across the varactor, CR902.

5. Replace CR902 with a SUPER DIODE for additional slide off

center frequency.

TUNEUP:

SSB ALC : R721

SSB MIC GAIN: R207

AM MOD : R217

R517 : AGC Adj. for 1.56 Volts 0 TP1

R516 : Squelch Range

R507 : S Meter

TX Align: T701, T702, L702, L704, L706, L709

*No SAMS on this one-however, CB286 on PC201 is fairly close.*

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I

OP VIEW

On the MB8719 Chips, for some reason, Pin 1 is not where

the dot is, that is Pin 18. So be careful when you locate

Pin 10.

Pin 18 is chip ground.

Pin 9 is chip 8V source.

Pin 10 is either no connection or is grounded.

32

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 ANOTHER 8719 MODIFICATION

COBRA 140/142 GTL

PRESIDENT WASHINGTON
REALISTIC TRC450,ETC.
This gives you coverage from 26.815 to 28.085 with no skips.

1. Cut the trace at pins 10, 11, & 16.

2. Wire 3 SPDT Switches and a CD4070 Exclusive OR gate
as diagramed.
3. Remove D25 on Pin 6.
4. Install a 1000 ohm JjW Resistor from Pin 6 to Pin 9 of
IC2.

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 RECEIVER WIDEBAND!NG FOR 858 CHASSIS

1. Locate TR5 RF AMP Transistor and remove (2SC1730L). Notice

how the transistor is orientated.
2. Replace with a 2SC945AP type transistor. »
3. Locate L4 receiver RF Coil. It is a double tuned coil.

4. L4 looks like this on bottom.

Cut trace going to the center of the coil and jump to the
end of coil.
5. Retune L3 and L4 for best overall performance. L4 will have
the greatest affect in broadbanding.

OPTIONAL

6. Locate TR9 and TRIO (2SC1675L) and remove. Again, notice

lead orientation.
7. Replace TR9 and TRIO with 2SC945 AP transistors.
NOTE: R46 may have to be changed from 330-'»- to a 1000*resistor
IF AGC seems to degrade receiver.
 NEW THUMBWHEEL CONVERSION WITH
TRUE READOUT FOR 858 CHASSIS
1. Wire up five 10 position BCD type thumbwheel switches*
as shown in FIGURE 1.

2. The mixer crystals will have to be changed also.

Order 11.269133; 11.268333; 11.267533. Replace the
11.2842 with the 11.267533. Replace the 11.2850 with
the 11.268333. Replace the 11.2858 with the 11.269133.

If you prefer LED readout in addition to the above,

you will need three TTL7447 7 segment decoder/drivers

and five FND507 or equivalent Common Anode LED's.

Wire as shown in FIGURE 2.

uPD 858

15 11 11 to 1$ It ll I If 15 I A IB

FIGURE 1
NOTE: TWS1 and TWS5 can be replaced with BLANK BODY sections for
lower cost. A "2" and a "5" can be stenciled on with white rub
on letters.
For Thumbwheel Switch Complete ask for Secret CB Item #129.

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NEW THUMBWHEEL CONVERSION WITH TRUE READOUT FOR 858 CHASSIS (Cont.)

Lets say our thumbwheels read 26.975, first we will "hard wire"

the "2" and the "5" as these will never change (LED 1 and LED 5)

FIGURE 2

36

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NEW THUMBWHEEL CONVERSION WITH TRUE READOUT FOR 858 CHASSIS (Cont.)

Next we will wire LEDs 2, 3, and 4.

FIGURE 3

Build a duplicate of the above circuit and wire to TWS 3 and LED 3.
Build another duplicate and wire to TWS 2 and LED 2. If you want
the display to read 26.975, connect a 22resistor from the decimal
point to ground.

37

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 AGC SELECTOR SWITCH

This practical switch can easily be added to the Cybernet 02-A

type chassis, ie, Midland, RCA, Boman to give the operator selec­

tive AGC control. This modification is built around a DPDT Center

Off Switch to give AGC FAST, AGC OFF, or AGC SLOW action.

PARTS REQUIRED

1 - DPDT CENTER OFF TOGGLE SWITCH

1 - 100K, ^W RESISTOR

1-1 MEG, ^W RESISTOR

1 - 8" LENGTH OF GREEN WIRE

1 - 8" LENGTH OF ORANGE WIRE

STEP 1. Locate and remove R121.

STEP 2. Solder one end of a piece of ORANGE wire into the hole
where R121 connected to the base of Q31.

STEP 3. Solder one end of a piece of GREEN wire into the hole
on the other end of where R121 was (+ side of C145).

STEP 4. Install the Switch in desired location.

STEP 5. Solder the two Resistors on the switch as illustrated.

STEP 6. Solder the GREEN and ORANGE wire on the switch.

STEP 7. Reassemble and Enjoy!

38

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 CYBERNET 02A CHASSIS

The VCO block in this Chassis is encapsulated in plastic

and replacements are not readily available for some units.

Don't fret, as now you can build your own on a piece of

perf board. Here is the schematic.

* Use only N150 type Capacitors.

* LI is an 18MHz coil (Secret CB Item #127).
* Dl is an MV201 or use a super diode (Secret CB Item #28) .

39

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 HOW TO HOOK UP A 1OT POT TO 2000GTL

Remove FVL/CVL and tape all loose wires. Replace with a

10 Turn Pot (Secret CB Item #46).

2 . Remove D51.

3. Wire up pot as shown:

4. Clip D52.

Try SECRET CB's VSB-1 (Voice Signal Booster) and you'll be glad
you did! Works great in the Cobra 2000.

40

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 TRANSMITTER/RECEIVER OPERATION OF
COBRA 1A6GTL, PRESIDENT AR14A, SEARS 663.38100050
REALISTIC TRCA5L TYPE CHASSIS
Reference: Block Diagram, Volume 12 page 11
*
4
AM OPERATION, TX:

An AF signal from the MIC is fed to TR26 through TR27. This

signal is amplified by TR26 and TR25, Mic Amp, and is fed to TR42
and TR43. The signal amplified by TR44 is applied to TR39 and
TR38 for modulation. For the RF portion, two signals are mixed
by IC5, mixer, with a 27MHz signal being produced. (One of these
signals is 10.7 MHz generated by TR23 and the other signal is
the VCO output approximately 16 MHz.) The 27MHz signal is am­
plified by TR41 and TR40. The signal is amplified and modulated
by TR39 and TR38 and then delivered to the antenna. D52 and
D53 make up the RF Power Meter detector.

AMC:

TR29 is a detector for AMC and the input attenuator consists

of R157 and TR27. In an overmodulated condition, TR29 turns on
and the detected current flows into R153. This current drives
TR 28 and TR27. As the collector-emitter inpedance of TR27
lowers, the input signal is lowered.

SSB:

The audio signal from the MIC is amplified by TR26 and TR25.
It is then applied to the Balanced Modulator, IC3. The carrier
signal (10.6925 USB; 10.6975 LSB) is applied to the other input
of IC3. IC3 produces a carrier-suppressed double sideband sig­
nal. The DSB signal is converted into SSB by the filter FL1.
In the USB Mode, carrier plus audio signal is produced; in the
LSB Mode, carrier minus audio signal results.
TRANSMITTER/RECEIVER OPERATION cont'd.

EXAMPLES: USB Mode:

Using a 1KC tone, two signals are produced:
(USB) 10.6925MHz+ iKHz = 10.6935MHz
(LSB) 10.6925MHz - 1KHZ = 10.6915MHz

LSB Mode:
(USB) 10.6975MHz = IKHz = 10.6985MHz
(LSB) 10.6975MHz - IKHz = 10.6965MHz

The center frequency of the crystal lattice filter is 10.6950

and will pass - 2.5KC or 10.6925 - 10.6975. So, on USB, the
10.6935 signal is passed but the 10.6915 signal is attenuated.
In LSB the 10.6965 signal is passed and the 10.6985 signal is
attenuated.
The SSB signal is then mixed with the VCO frequency by IC5 and
the resulting 27MHz is amplified by TR41, TR40, TR39, TR38 and
fed to the antenna.

ALC:
TR37 is the ALC detector. If the power level exceeds a level
set by VR6, TR28 drives TR27 to decrease the audio input to IC3,
thereby lowering SSB Power.

UNLOCK DETECTOR:

TR33 shuts off the transmit output if the PLL is unlocked by

turning off TR32. Pin 15 of IC2 goes low in an unlocked condi­
tion .

RECEIVER:

A signal from the antenna is fed to RF Amp TR12. It is then

mixed with the VCO frequency at TR13 which produces the IF fre­
quency of 10.7MHz. This 10.7MHz signal is amplified by TR14,
TR15, TR16, and TR17. In the AM Mode, the signal is detected by
D22 and D23 and sent to TRIO, the AF amp.

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TRANSMITTER/RECEIVER OPERATION cont’d.

In SSB Mode, the signal is fed to TRIO which operates as a

demodulator. A signal from the carrier oscillator is necessary
for this; the clarifier must be "user adjusted" for best audio
intelligibility. The signal is then routed to the AF Power Amp
IC4 via TR11 (Squelch Switch) and TR36 (AF Driver). It is then
sent to the speaker.

AGC:

IC1 is the AGC amp. The processed signal is switched by TR8

and TR9 and fed to TR14 and D13/D14 which adjusts the IF and RF
gain respectively. Part of the signal from IC1 also goes to
the squelch control circuit (TR11).

TRC W
VSB-1 HOOK-UP
COMPRESSOR:

1. Remove C95.

2. Solder Black wire to + side of hole.

3. Solder White wire to other hole.

4. Remove AMC control Q14.

(C95 is a 1 ufd. close to Q15.)

EXPANDOR:

1. Remove C274 (.022).

2. Solder Black wire towards collector of Q210.

3. Solder White wire towards R253.

No Pre-Amp needed.

43

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 MIDLAND 77-0004 4001
VSB-1 HOOK-UP
COMPRESSOR:

1. Remove Q202.

2. Lift end of RFC308 that connects to Mic Gain.

Connect as shown:
Will probably need to
use power Mike for best
results.

EXPANDOR:

1. Remove C121.

2. Install Pre-Amp as follows:

DETECTOR TO VOLUME CONTROL

44

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 TROUBLESHOOTING CLARIFIER PROBLEMS
ON THE 858 CHASSIS

COMMOM PROBLEMS:

A. Distorted Output
B. Warble
C. Drift
D. Sounds like mike is under water
E. Weird FM effects

COMMON CAUSE:
Main power supply,Zener/IC Regulators, Voltage feed
circuits, primarily those concerned with the VCO and
PLL sections.
Power supply regulation problems are often caused by leaky or
dried out electrolytic filter capacitors. I always change the
original filter cap. (commonly a 1000-3300uf/25V) to a 5600uf/
50V.

Another possible cause is in the design of the power supply.

Common practice is to design the unit with Lhe minimum adequate
power supply (current) to hold costs down. Then you have
problems after you tune it up. The only answer is to redesign
the power supply.

Also, the more slide that you have installed, the more critical
the voltage regulation becomes. A 4 to 1 ratio over the original
range is about the maximum usable slide before modifications to
the reference voltage becomes necessary.

An improved type of regulator would be to disconnect the existing

voltage line connected to the clarifier pot and insert the cir­
cuit shown:

Z 2 o-^ '/»IV

45

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TROUBLESHOOTING CLARIFIER PROBLEMS ON THE 858 CHASSIS cont'd.

This circuit effectively isolates the reference voltage from all

other circuits that could cause voltage fluctuation to the VCO.

Difficulty with the clarifier control usually stems from the VCO
circuit itself. The following symptoms are related to each other
and adversely affect the clarifier control.
1. Clarifier does not linearly track frequency.
2. Center clarifier position rarely matches center
frequency.
3. When using an inductor to tune the crystals to
match center clarifier position to center fre­
quency, slide range is lessened.
4. Transmit and receive are not together.

To cure these problems, use the directions below. The purpose

of this technique is to figure out the ratio between crystal
frequency and output frequency and then calculate the new crys­
tal frequencies you will need.
NOTE: Use tunable coils and be sure you are satisfied with the
slide range before beginning. Changing amount of slide
could cause the RATIO to change, nullifying your efforts.
Let's Begin.

STEP 1. Remove covers. Connect a frequency counter and a dummy

load. Set clarifier to center position on channel 40.

2. Key Radio and write down the output frequency. (Ours

read 27,400,900.).

3. Remove X3 (11.2858)Xtal. Plug X6 (11.2850) Xtal in

its place. Read frequency and write down. (Ours
read 27,398,700).

4. Remove X6. Plug X4 (11.2842) Xtal into X3 position.

Read frequency and write down. (Ours read 27,396,700)

5. Replace crystals to original positions.

6. Subtract reading obtained in STEP 2 from center frequen­

cy. (Here is how ours looked: 27,405,000-27,400,900 =
4,100.) Write your answer here:

46
TROUBLESHOOTING CLARIFIER PROBLEMS ON THE 858 CHASSIS cont’d.

7. Subtract X6 from X3: 11,285,800 - 11,285,000 = 800.

Subtract X4 from X3: 11,285,800 - 11,284,200 = 1,600.
Subtract Step 3 from Step 2. (27,400,900 - 27,398,700 =
2,200.) It can clearly be seen that an 800 hertz change
in crystal frequency moves the transmit approximately
2,000 hertz in my example. Yours will vary; however
the RATIO will be the same.

8. Subtract Step 4 from Step 2. (27,400,900 - 27,396,700 =

4,200) So a 1,600 hertz change in crystal frequency
moved the transmit frequency down 4,200 cycles. To shift
the frequency up, simply add 1,600 hertz to the X3 crys­
tal frequency. 11,285,800 + 1,600 = 11,287,400 This
is how you figure your new X3 frequency.

9. Calculate X4 and X6 Xtal frequencies you want to order:

X4 = 11,284,200 + 1,600 = 11,285,800
X6 = 11,285,000 + 1,600 = 11,286,600

10. Place new crystals in their appropriate sockets. To

compensate for any remaining errors, set clarifier to
center position and adjust the inductor for each parti­
cular crystal.

MODE REC. XMIT FREQ. REC. FREQ. XMIT

AM X6 X3 11.2850 11.2858
USB X3 X3 11.2858 11.2858
LSB X4 X4 11.2842 11.2842

This technique works well and solves alot of headaches!

 SUPER REGULATOR

Are you having trouble with poor regulation which is Very

Critical in Clarifier Circuits? The National Semiconductor
LH0070-1H 10 volt 3 terminal Precision voltage regulator is
virtually independent of input voltage, load current, temper­
ature and time.

SPECIFICATIONS:

Input voltage: 12.5V to 40V

Accurate Output Voltage: 10V - .01%
Low Output Impedance: .1
Excellent line regulation: .lmV/V
Low Zener noise: 100 uV p-p
3 lead T0-5 Case
Short Circuit proof
Low Standby current: 3mA
Power dissipation, max.: 600 mW
Output current, max,: 20mA
Operating Temperature Range - 55° c to +125°c
OUT PVT
\nrtrr E J—fcAte}

BOTTOM VIEW
Use it-you’ll appreciate it!
TWO RECEIVER PREAMPS YOU CAN BUILD

49

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 LINEAR NOTES

Sometimes a new amplifier will break into oscillation and "hang

up" the receiver. Symptoms of this are:

Very noisy receiver.

Inability to receive.

Signal fuzzy or noisy.

Excess idle current.

Splatter.

If you have determined that this is your problem, there is usually

a simple solution. Remove the cover and do the following steps:

1. Locate the power transistors. They will be stud or flange

mount type and will be attached to the heat sink and look
like an aspirin with four gold legs. Usually you will find
two that look like this (although this will vary greatly
depending on wattage and design).

. emitti«.

Collector

£ai/T7£«

Errait

Anyway, the most important thing is to locate the base and collect

tor. Usually the collector is cut at an angle. The emitters

(two each) are grounded. There will probably be a 10-22 ohm

resistor from the base to emitter.

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 2. Obtain a .01/1KV disc capacitor and a 100-^ /IWatt carbon
resistor.

//fATSIAlK

STUD

Si^e viEiv

3. Connect resistor and capacitor together and then solder

the other capacitor lead to the Collector. Solder the
other resistor lead to base.

e—WV
i o |W
— |( ,Ol@ IKV
—c

Install the above circuit across each of the power transistors.

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 MODULATED GUNN OSCILLATOR

Alot of requests for this one, so here it is! The heart of

this system is a Microwave Gunn Oscilator on 10.525GHZ (X BAND)*.
A 100MW used one can be obtained for about $50.00. A complete
unit can be built for under $75.00.

First we need to build a precision tone oscillator.

PARTS REQUIRED
1-HEP 170 diode
1-150-"- Resistor
l-9v/ 1W Zener diode

2-50K-10 Turn Trim Resistors

1-5.6K Resistor %W
l-10ufd/16VDC Elect. Capacitor
1- .047 disc capacitor
1- .047 Mylar capacitor
1-555 Timer I.C.
I-IOO-*’- Resistor
1-10K Resistor
1-2N2907A Transistor
1-560-^- Resistor
1-Green L.E.D.
1-DPDT Center off Switch
1-P C Board or perf board

* This item is currently available from:

Lectronic Research Labs, Inc.
1423 Ferry Ave.
Camden, N.J. 08104
(609)541-4200

The schematic is on the following page. Build it with care.

MODULATED GUNN OSCILLATOR (Cont'd.)

Assemble parts as shown below:

i^0 100

Adjust RT1 so output frequency is 879 hertz (28 MPH).

Adjust RT2 so output frequency is 1696 hertz (54 MPH).
Green LED tells us the tone oscillator is working properly.
A) connects to (a) in next circuit.

Next we will have to build a voltage amplifier.

MODULATED GUNN OSCILLATOR (Cont’ d. )

Voltage Amplifier Circuit

Parts Required:
l-.l disc capacitor
1-100K Resistor
1-220K Resistor
1-2.2 MEG % W Resistor
1-12K Resistor
1-1.5K Resistor
1-2N2222A Transistor, NPN
1-2N2907A Transistor, PNP

Hook up as follows:

® connects to next circuit.

Next we will build the Gunn oscillator voltage regulator

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MODULATED GUNN OSCILLATOR (Cont’d.)

Gunn Regulator Circuit

Parts Required:
1-2N3055 NPN Transistor + heatsink
1-11V/1W Zener
1-560-'»- hw Resistor
1-Red LED
1-150-*- Resistor

>150

Add a lufd/25VDC capacitor on Gunn Oscillator for harmonic suppression.

© connects to voltage amp in previous circuit. LED 2 indicates

the Gunn Regulator is operating O.K.

NEXT ASSEMBLE.
 MODULATED GUNN OSCILLATOR (Cont'd.)

ASSEMBLE:

Radio Shack Metal Cabinet #270-251 can be used.

Conclusion: Although alot of truckers are using "Jammers" we

do not suggest you actually build the above circuit
or you could find yourself in serious trouble with
the FCC and Law Enforcement Agencies. We Assume No
Responsibility for the use of the material or Con­
sequences thereof.

56

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 HOW TO ADD SLIDE TO YOUR COBRA 29GTL

1. Clip D18.

2. Remove RI10.

3. Install jumper wire in place of R110.

4. Cut Orange wire from Delta tune to PC Board at PC Board.

5. Resolder end of'Orange wire to emitter of TR23.

6. Remove C131 6pf cap.

7. Remove R112.

-£D16 may be changed to a Super Diode or a Super Slider can

be added for more slide.
 BOMAN 910 (02A)

bPbT
C£NTE« X dEMoi"£S cui hsitE
OFF

# 1 up; #2 Center - Normal

# 1 down; #2 Center - Ch. 12 is 27.425, Ch. 38 is 27.705.
# 1 up; #2 up - Ch. 10 is 26.755, Ch. 38 is 27.065.
# 1 up; #2 down - Ch. 10 is 26.435, Ch. 38 is 26.745.

A PRODUCT OF SELMAN ENTERPRISES

58

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 SPECIFIC RADIO TUNE-UPS

COBRA 29 LTD
Unit has a fantastic receiver! Frequency is expanded by using
our Zapper 9000.
VR1 RF Gain.
VR2 "S" Meter Adj.
VR3 Squelch Range.
VR4 Modulation Level.
VR5 RF Meter Adj.
VR6 Ant. Warn. Ind. Adj.
Peak L14, L16, L17 to maximum.

CYBERNET 02A AM RADIOS

For increased RF Power, jump the diode that is located to the

right of the AMC control.

t>!3 o’*. b’°5

SHORT O(JT
RVZ uot KB
e>R
RV1O2-
Riac

Drawing above represents Hygain Chassis. Yours may vary slightly.

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SPECIFIC RADIO TUNE-UPS cont'd.:

CENTRONICS GTX 5000

ROBYN T240D
This unit has had problems with the 6BQ5 tubes going out very

quickly. I have replaced them with 7189 tubes and have had no

further problems. It also helps increase modulation.

GENERAL ELECTRIC 3-5871A

Clip Blue wire coming form PLL and add Switch.

T802 VCO Coil.
VR1 AGC Adj. for 1.45V @ TPI.
V R10 RF Gain.
V R3 Squelch threshold;
V R4 "S" Meter
V R6 AM Mod. Control.
V R7 RF Panel Meter.
Peak L901, L903, L905.

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 SPECIFIC RADIO TUNE-UPS cont'd.:

ITT CB-4000M

Cut #1 wire as shown and add switch. This gives Channels 41-59

J.C, PENNEY 6246 (PLL 6055)

Connect and wire a SPDT Center Off Switch as shown:

•-------- >To Pin 12

•-------- >To Pin 11

•-------- ->To Pin 10

Top position gives 27.415 - 27.435.

Center Position is Normal.
Bottom Position gives 27.445 - 27.595.

JOHNSON 4125/4174

Locate the PLL Chip and the PC trace as shown below. Make and
break trace with a SPST Switch.

61

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SPECIFIC RADIO TUNE-UPS cont'd.:

MIDLAND 13-882C (02A)

Isolate pin 9 from ground for lowers and add switch for Low
frequencies.
T101 - VCO Coil
RV101- SQ. Range
RV103- S Meter
RV102- AMC
RV104- RF Power Meter
RV1 - Ant. warning threshold
RX Align: T104, T105, L112, T106, T107, T108, T109.
TX Align: L103, L104, T102, T103, L106, L109, L110.

MIDLAND 13-867

Clip D14 for max. mod.

Peak L12, L13.

PEARCE-SIMPSON PUMA 23B

RX: 455KC T7, T8, T6
27.115 T4, T3 , T2 , T1
VR1 IF Gain Connect VOM to base of TR7. Adj. to IV.
VR4 SQ. Range
VR3 "S" Meter Adj. S9=100UV.

TX: On Ch. 13, peak T5, Til, T12, T13, L4, L5, L8 for max.
T.V.I. Trap Adj. LIO on Ch. 2.
Peak L8 for max. RF output.
VR2 RF Panel Meter
Modulation: Remove C50. Located near Audio Transformer. This
will eliminate mod. Limiter.
TX Power: For more power, remove DIO and replace with a solid
wire jumper.

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SPECIFIC RADIO TUNE-UPS cont'd.:

ROBYN T240D
Here is how to get 26.645 - 27.595 out of the radio. Obtain a
SPDT toggle switch and wire like this:

► To Pin 11

► To Pin 3

► To Pin 4

UP POSITION: Up to 27.595.
CENTER : Normal
DOWN : Down to 26.645.
Adjust L181 as needed for full frequency range.
VR4 Modulation
Peak L801, VC901, VC902 and L702 for maximum.
VR6 RF Power meter adjustment.

SHARK 23
Adjust VR201 for maximum acceptable modulation or clip D201.
Peak L308, L307, L305.

STANDARD 29A uPD857

L2 VCO Adjustment.
VR208 Squelch Range. To Pin 7
VR212 S Meter Adj. ■>- To Pin 12
VR210 RF Meter Adj.
VR213 Modulation Level.
Peak L213, L214, L217.
For expanded frequency coverage:
1. Isolate Pin 7 by cutting away from ground.
2. Solder a 4.7K Resistor across cut.
3. Wire up a SPST Switch, as diagramed.
This will yield channels 27.455 to 27.805. Adjust L2 for full
coverage.

63

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 REALISTIC DX300 (20-204)

This quality Synthesized Communication Receiver can usually

be bought at a bargain price because of design problems.

PROBLEM: Beat tones, harmonics.

SOLUTION: The following parts are located inside the LED display
compartment.

1. Change C501 (56pf) to a 22pf.

2. Change C503 (56pf) to a lOpf.

3. Add a 20pf Ceramic Trimmer across C503 .

4. Connect your frequency counter probe to TP-501. Connect

the probe ground to a ground on the DX-300 (as close to
TP-501 as possible.) Adjust the trimmer above for 1MHz
i 10 Hz. (CRITICAL).

NOTE: If you don't have a counter, use WWV @ 10MHz. and adjust
for a zero beat.

Now you can enjoy that DX300 Receiver!

27 MHz CB, AM
29.6 MHz Amateur Radio Band, FM
30 - 50 MHz (normal scanner tuning range)
52.525 MHz Amateur Radio Band, FM
57.5 MHz - 66 MHz Department of Energy, Air Force, and Army — FM
72 MHz - 73 MHz Highway Patrol Link Frequencies
74 MHz - 75 MHz FAA and Landing Signals
79 MHz Department of Interior — FM
80 MHz - 88 MHz Military Frequencies — FM
88 MHz - 108 MHz FM Music Band
108 MHz - 118 MHz Aircraft Omni, Aircraft Weather, and airports — FM
118 MHz - 136 MHz Aircraft Band — AM (most scanners receive this)
136 MHz - 138 MHz NASA Satellite Downlink Band — FM
138 MHz - 138.5 MHz United States Air Force — FM
138.52 MHz - 139 MHz U.S. Navy — FM
139 MHz - 139.475 MHz U.S. Army—FM
139.480 MHz - 144 MHz Ail Military Services — FM
144 MHz - 148 MHz Two Meter Band — FM (all scanners)
148 MHz - 174 MHz High Band, Government — FM (all scanners)
174 MHz - 180 MHz
380 MHz 381.6 MHz FAA — FM
OPPS, WE GOOFED! cont'd.

VOL. 10,PAGE 48 : Step 5 should read - Clip D205.

VOL. 11,PAGE 4 : 3rd line from bottom should read -

29.805 on channel 40.

VOL. 11,PAGE 6 : For logic 26.645, Pin 14 is 0.

VOL. 11,PAGE 10 : 11.5816 should read 11.5858.

VOL. 11,PAGE 41 : Diagram Correction:

VOL. 11,PAGE 75 : Replace 03A with 02A (rewiring

necessary) for extra channels.
 SECRET CB INDEX
LISTING ALL MODELS/CHASSIS COVERED
"SECRET CB" SERIES VOLUMES 1 THRU 12

CONVERSIONS VOL/PG COBRA (Cont.) VOL/PG DELCO VOL/PG

Conversion tips for 1000GTL.......... 8/17
Delco factory AM/FM/CB
all SSB radios ........ 9/7 2000 (C.A.P.) .... 6/23
Combo Unit..... 11/38-40
"A" Channel Mod. 2000GTL ...5/20,7/15-17
for all SSB ....... 9/16-17
COLT DEMCO
MB8719 Standard
Modification.....10/25-27
SX33 ............ 3/4-7 Star II ............ 5/60
Tech tips on the
210 LC713OPLL ....11/33 Super Satellite .... 5/60
858 Chassis ......... 10/55
Uniden 858PLL 290 .............3/4-7
390 .............3/4-7 FIELDMASTER
update ............ 9/8-11
How to get on 28 & 29 MHz 480 ....... 3/8-15,5/39
Micro-mini 40 frequency
w/the UPD858 PLL Chip11/4_? 485 ............ 3/8-15
expansion details...11/37
800 ............. 3/4-7
How to increase ANL 1000 ........... 3/8-15
efficiency 70% ....... 11/8 G.E.
Ham Radio Crystal COURIER
Selector ......... 12/24 Superbase 3-5875-A..10/48
23 Ch PLL02A AM Conversion Centurion PLL..1/31,61,
for 26.645 to 27.275..12/32 GEMTRONIX
62,5/55
Centurion 40D ....10/53
BOWMAN Galaxy ........ 5/53,54 GTX77 .............. 5/39
7/18-22
CB910 update ........ 11/41 HALLICRAFTERS
Gladiator PLL..1/31,61,
CB930 ................ 3/21 62,5/55
CB950 ................ 5/39 Spartan...... 1/61,62, HCM271 ......... 5/50,51
CBH990 ........................................................ 5/43 6/39
5/30,53,55
BROWNING LTD CPI HYGAIN

LTD .................. 1/53 300 .............. 8/21 I-A ................ 1/22

MKIII ................ 6/28 400 .............. 8/21 PLL ................ 1/32
MKIV.............. 6/29-30 2000 ............. 3/25 II ................. 8/20
MKIV, IVA .......... 7/8-13 2000 Low ......... 9/23 V-02A .............. 11/8
2500 .......... 5/37,38
COBRA ALC Mod for increased J.C. PENNEY
SSB Power ....... .11/9
29GTL ................ 8/16 6248 ............... 8/24
32XLR................ 4/47 CRAIG
87GTL ................ 8/16 JOHNSON
89GTL ................ 8/16
L131 & L231....9/12-14
132B ................. 1/53 L132 & L232....... 9/12 242-4730 ....... 10/49-51
132XLR........... 10/45-46 L232 &L132 w/UPD 4740 (NDC40013) .... 11/9
135B ................. 1/53
2824C Chip..10/47,11/10
135XLR ............... 4/38 KENWOOD
135XLR update.... 10/43-46 DAK
138XLR............ 1/20,23 TS-120S ........... 12/22
139XLR ............ 1/20,23 IX ........... 5/21-23 TS-130 ............ 12/23
140GTL ............ 3/19,20 IX Mod. update..9/18-19
142GTL ............... 8/15 KRACO
X ............ 4/39-46
146GTL .............. 10/41
148GTL ............... 8/16 KCB233A ............ 9/15

68

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 SECRET CB INDEX (Cont'd):
CONVERSIONS (Cont.)
MIDLAND VOL/PG PRESIDENT VOL/PG SBE (Cont.) VOL/PG

13--883B (UPD858) ...12/4 McKinley......... 4/12,13 39CB Sidebander V..2/36,37

13-892 ............ 11/10 McKinley w/11.1125..10/29 Sidebander II .... 2/28-35
79-892 ............ 11/11 Teddy R............. 1/60 Console IV ....... 2/28-35
79-893 ............. 2/20 Washington ....1/22,23,59 Sidebander Console VI.8/14
79-900 ............. 5/47 Washington w/11.1125 Console V........ 2/37,38
6001-7001 ......... 11/16 ................ 10/28-29 LCBS-4 ........... 7/29-33
Zachary T .......... 1/60 LCMS-4 ........... 7/34-37
MORSE
RCA SEARS
3005 ............... 2/27
14T302 .......... 5/11,39 562-38220700 ....... 10/56
MOTOROLA 14T302 (PLL 02AG)....4/36 663-3810 w/2824 Chip.11/22
934-3677150...... 12/16,17
CM555 (TC9105P) ...... 12/7 REALISTIC 934-36772600..... 12/16,17
934-38260700 ..... 6/26,27
NESCO TRC-57............. 12/28 10/52
TRC-431.......... 7/23,24 934-38270700 ..... 5/28,29
1249 .............. 6/38 TRC-448REC86345PLL.il/16 934-38260700 Update..11/23
TRC-450 ......... 10/31 934-38270700 Update9/20-22
PACE TRC-451 ...... 12/10-13 PLL D63911 W/UPD861C Chip
TRC-455(SM5104)....12/30 ................... 12/26
8092 .......... 6/35,36 TRC-457 ......... 10/36
TRC-459 ...... 10/32-35 SHARP
PALOMAR TRC-480 ...... 10/37,38
TRC-490 ...... 12/14,15 CB-5470 HD42851B3....11/24
500 ........... 4/19,20
5/32-36 RAY JEFFERSON SILTRONIX
8/21
CB845 (02A) ....... 12/27 1011C .............. 1/46
PANASONIC 1011D .............. 1/46
ROBYN
RJ3600 ........... 10/57 SONAR
GT-440D ............ 1/23
PEARCE SB-505 .......... 5/41,42 FS-2340 ............ 5/31
SB-520D ......... 2/21,22
Cheetah PLL.... 1/31,32 SB-540D ......... 5/19,36 STANDARD HORIZON
Simba PLL...... 1/31,32 7/25-38
WV-23 ........... 1/24,25 29-A ».............. 5/58
PRESIDENT WV-110 (SM5104).... 12/31
STONER
Adams............. 2/16 ROYCE
AR144 ......... 11/17,18 Pro-40........... 4/52,53
AR144 UPD2824C PLL.11/41 1-601 .............. 1/26
AR144 Update..... 11/42 1-612 .............. 5/45 SUPERSCOPE AIRCOMMAND
Grant ........ 1/22,23,59 1-632 Update ...... 11/21
2/17,23-26 1-641 ............. 11/20 CB 340 .............. 8/19
Grant (New)..... 5/24-27 CB 340 (861PLL)Update 9/24
Honest Abe ........ 1/60 SBE SWAN SIGNET
John Q ............ 1/60
Madison w/11.3258..10/30 Formula D .......... 1/49 270 ................. 5/58
Touch Com....... 1/50,51

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 SECRET CB INDEX (Cont'd):
CONVERSIONS (Cont.)
TEABERRY VOL/PG YAESU VOL/PG GEMTRONICS VOL/PG

52 Ch. Capability.... 1/43 100 ............... 5/58 GTX-77 .............. 4/49

CAP Mod.............. 5/30 FT-901 .......... 6/3-12
Model T ............ 4/3,4 FT-7B .......... 7/38-41 HYGAIN
Racer T ............. 1/58 FT-707 ........ 10/20-24
Ranger T ........... 4/1,2 623 ................. 1/33
6/24,25 674-A............... 4/60
************************
STALKER JOHNSON
SLIDE MODIFICATIONS
1(4001/4003) ....... 4/7-9 352 ................. 1/34
BOMAN VOL/PG
T Bear ........... 4/14,15
T Dispatch ....... 4/14,15 MIDLAND
950 ............... 4/49
Titan T .......... 4/14,15
XV ................. 10/39 COBRA 13-892 ............. 11/13
XX ................. 10/40 13-893 .............. 4/51
13-898 .............. 1/36
132-A............. 1/28
TRAM 13-898B ............. 1/35
135-A............. 1/28
79-960 .............. 5/47
135-B ............. 1/29
D12 ................ 10/56
138 ............... 1/28
D42 ............ 4/47,5/40 N.D.I.
139 ............... 1/30
D60 ................. 1/53
140GTL ............ 4/50
D62 ............. 10/45,46 PC-201 (NDC40013 PLL).12/8
142GTL.... 4/50,8/35-37
D80 MB8734 w/11.3258.10/30
135XLR............ 8/38
D201 ........ 1/56,3/22,23 PACE
2000GTL.......... 12/20
D201A Update ....... 10/54
D300 ............. 8/11-13 COLT 1000 ........... 1/37,38
DX1023B ............. 1/39
TRS CHALLENGER 8092 .............. 6/37
485 ............... 4/49
8193(CCI3001)......... 12/9
460 ................. 4/28
COURIER
600 ................. 4/28 PALOMAR
730 ................. 4/30
Centurion......... 1/61
1200 ................ 4/31 Galaxy ............ 5/53 500 ..... ... .4/19,5/32,35
850/1400 ....4/21-27,32-35 Gladiator PLL..... 1/61
PEARCE
Spartan ........... 1/61
TRUETONE
Bengal .............. 1/40
CPI
CYJ-4837A-87 ....... 11/14 Cheetah ............. 1/40
2500 .............. 5/37 Simba ............... 1/40
VICTOR
CRAIG PRESIDENT
770 ............. 4/56,57
790 ..............4/58,59 Adams ............... 2/16
L-131,L-231..... 9/12,14
L-132,L-232 ....... 9/12 Grant ............... 1/59
WARDS Grant (New) ......... 8/34
L-231 ............. 12/3
McKinley ............ 4/12
719A W/UPD2824 Chip..11/10 DAK Washington .......... 1/59
Washington(New) ....8/33,34
X 4/45

70

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SECRET CB INDEX (Cont'd):
SLIDE MODIFICATIONS (Cont.) SPECIFIC RADIO TUNEUPS
RCA VOL/PG AIR COMMAND VOL/PG CLARION (Cont.) VOL/PG

14T302 ............... 4/49 CB-640 ............. 5/38 RCJ003 ............... 3/45

TC203E ............... 6/18
REALISTIC ALARON
COBRA
TRC-47 ............... 1/41 B-4075 ............. 9/30
TRC-48 ............... 1/42 B-4900 ............. 9/30 19 ................... 7/51
TRC-458 ........... 8/39,40 B-5050A............ 9/30 19GTL ............... 12/34
B-5200 ............. 3/41 21GTL ............. 3/41,58
ROBYN 21XLR ................ 1/20
AMERICAN MOTORS 21XLR Update ........ 10/58
SB-505 ............... 5/41 25GTL ............. 3/41,58
SB-540D .............. 5/19 3231847/48/49/50....12/34 29GTL ................ 3/45
29XLR ................ 1/20
ROYCE AUDIOVOX 32XLR................ 3/58
45XLR............... 12/34
1-632 ................ 5/14 MCB750.............. 3/41 46XLR................ 3/43
1-641 ................ 4/51 MCB5000 ........... 11/42 47XLR................ 3/45
MDV6000 ............ 6/18 50XLR................ 3/43
SBE 55XLR................ 3/43
AUTOMATIC 66GTL ............... 10/58
Sidebander II..1/47,2/28-35 77X .................. 9/30
Sidebander V....... 2/38-40 CBH2265 ............ 3/41 78X .................. 9/44
Console IV........ 2/28-35 78XLR........... 4/49,6/19
Console V ....2/28-35,38-40 BOMAN 86XLR................ 3/45
87GTL ................................... 6/19
SEARS CB555 .............. 3/44 89GTL ................ 6/18
CB750 .............. 2/43 132XLR............... 3/45
934-38270700...5/28,9/20-22 CBH900 ............. 3/44 135XLR............... 3/45
934-38310700 ......... 5/19 CB910 ......... 1/21,3/44 139 .................. 1/20
Roadtalker SM5104 ....12/18 CB920 ............ ...1/21 140GTL....... 3/20,58,4/50
CB930 ......... 1/21,3/44 142GTL ............... 4/50
SILTRONIX CB950 .............. 3/43 148GTL ............... 6/19
CBR9600 ....... 2/42,3/41 1000GTL .............. 6/18
SSB ................ 1/45 CBR9940 ............ 3/44
CBR9950 ........... 10/58 COLT
STONER
CHANNEL MASTER 222 .................. 6/20
Pro-40 ............ 4/52,53 290 .................. 3/40
CB6835 ............. 6/18 390 ................... 3/4
TEABERRY 480 ................ 3/8,58
CHRYSLER 485 .............. 3/8,6/19
Stalker IX/XV....... 4/7,8 800 ................... 3/4
4048076/8077........ 6/18 800 Update .......... 10/58
TRAM 1000................ 3/8,58
CLARION 1200 .............. 9/30,31
D60.................. 1/52
D201................. 1/56 DMA066 ............. 3/45 COMMANDO
D300 ................ 12/19 JC202E ............. 3/45
*************************** 2340 ................. 1/21
 SECRET CB INDEX (Cont'd):
SPECIFIC RADIO TUNEUPS (Cont.)
CONVOY VOL/PG FORMAC VOL/PG HYGAIN VOL/PG

CON-400 ............... 3/58 40 10/60 2716..... 12/36

CPI GE ITT

CP400 ................ 10/59 3-5800A ..... 3/50 4400M................ 4/17

3-5804B ..... 6/21
COURIER 3-5804F .... 10/61 J.C.PENNEYS
3-5804G .... 12/35
Blazer 40D ............ 3/58 3-5805A ..... 9/31 981-6204 (981-7461)....9/32
Classic PLL 40 ........ 3/43 3-5811B 9/31,10/61 981-8360 ........... 10/61
Classic PLL 40 Update..10/59 3-5812A .... 10/61 981-6247 ........... 11/14
Fanfare 125F .......... 3/43 3-5814B ..... 6/21
Fanon Rogue 40 ........ 3/43 3-5817A ..... 7/51 JIL
Nightrider 40DR....... 3/46 3-5818A ..... 2/42
Rangier 40D ..... ...... 3/58 3-5819A .... 11/42 615CB ............... 11/42
Redball ............... 1/21 3-5821A ..... 9/31
Renegade 40 ........... 3/46 3-5821B ..... 3/54 JOHNSON
3-5825A ...9/31,32
CRAIG 3-5830 ..... 3/42 123A ................. 1/21
3-5869A ..... 2/42 Viking 200 ......... 12/36
L101 ............. 6/20/11/42 3-5871B ..... 3/46 Viking 260/270 ...... 3/49
L102 .................. 6/20 3-5875A ..... 9/32 Messenger 40 ....... 12/36
L131 ................. 10/59 3-5900A .... 12/35 Messenger 50 ........ 7/51
L231 (AM,SSB) ........ 10/60 Messenger 80 (242-0080)7/51
GEMTRONICS Messenger 4120 ...... 3/47
DAK Messenger 4135 ...... 3/48
GT44 ............... 2/42 Messenger 4140/4145....3/54
Mark II .............. 10/60 GT55 ............... 3/48 Messenger 4170/4175....3/47
Mark V............... 12/34 GTX66 .............. 6/21 Messenger 4170/4175 Update
GTX77 .............. 6/21 .................... 11/43
DELCO GTX4040 ............ 3/48 Messenger 4250 ....... 3/48
GTX5000 ............ 3/42 Viking 4330/4360 .... 11/43
70BFMC3 ............... 2/43
80BCB2 ................ 6/20 GM KRACO
90BCB1 ............... 10/60
90BFMC1 .............. 12/26 CBD-20U ........... 12/36 KCB-2340 ............. 2/42
90BFTC1 (AM,FM,CB).... 10/60 CBD-203 ............ 3/48 KCB-4000 ............ 11/43
90BFPC1 .............. 12/26 4120 ............... 3/46 KCB-4003 ............. 3/43
91YFMC1 .............. 12/26 4145 ............... 9/32 KCB-4005 ....... 9/38,11/43
4175 ............... 3/46 KCB-4020 ............. 3/49
FANON KCB-4030 ............. 8/44
HYGAIN KCB-4088 ............. 3/50
10-40 ................. 6/20
Fanfare 182F .......... 3/41 VIII 3/59 KRIS
Fanfare 184DF ......... 3/47 674A 4/60
Fanfare 185PLL........ 3/46 V674B 1/21 XL25 ................. 2/43
Fanfare 190DF..... 3/47,7/51 2701 2/42
Fanfare 350F .......... 3/47 2702 3/48
2703 3/48

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 SECRET CB INDEX (Cont'd):
SPECIFIC RADIO TUNEUPS (Cont.)
LAFAYETTE VOL/PG MOPAR VOL/PG PIONEER VOL/PG

Comstate 525 ......... 11/45 4094173 ............... 3/51 GT-100G(AM-FM-CB)....10/62

Dynacom 40 ............ 11/44 4094176 ............... 3/51
HB640 ................. 2/43 4094177 ............... 3/49 PRESIDENT
IJ4-100 (PLL02A) ...... 12/36 4094178 ............... 3/60
LM-300 ............... 12/37 AR-7 ............... 12/40
SSB140............... 11/44 MOTOROLA AR-44 .............. 10/63
Telestat 1240 ......... 5/14 AX-711 ............. 12/40
T4000A/05A10A/20A..... 3/50 Adams ............... 2/16
LAKE CF925AX .............. 11/46 Andrew J............. 9/34
Mocat 40 ............. 11/46 Dwight D............ 10/62
410..................12/37 James K........ 7/53,12/40
450 ................. 12/37 NDI Old Hickory ......... 9/34
600 ..................12/37 Washington .......... 1/22
PC-102 ............... 11/46
MEDALLION PC-200 ................ 7/52 RAY JEFFERSON

63-240 ................ 3/50 PACE CB-845 ............. 11/48

MIDLAND 8003 ................. 11/47 RCA

8008 .................. 2/43
150 M . ..... 7/52 8016 ................. 11/47 14T270 .............. 9/36
13-893 ..... 4/51 8046 .................. 9/33 14T300 .............. 2/43
63-445 .... 11/45 8113 ................. 12/39 14T302 .............. 3/53
76-858 ..... 3/49 8117 ................. 11/47 14T303 ............. 11/48
77-101B ..... 8/44 8155 ............ 9/34,12/40
77-101C .... 12/38 8193 .................. 7/52 REALISTIC
77-821 ..... 3/42
77-824 ..... 8/44 PALOMAR TRC-45A ............. 4/37
77-824B .... 12/38 TRC-47 .............. 1/21
77-824C .... 12/39 49 .................... 3/60 TRC-57 .............. 1/21
77-838 ..... 9/33 500 .............. 4/19,5/32 TRC-99A ............. 4/37
77-849 ..... 3/50 4100 .................. 3/54 TRC-100 ............. 4/37
77-856 .... 11/45 TRC-180 ............. 4/37
77-861 ..... 3/50 PANASONIC TRC-200 ............. 4/37
77-861B .... 11/45 TRC-200 Update..... 10/63
77-865 ..... 9/33 CR-B4747EU(AM-FM-CB)....9/34 TRC-204 ............ 10/63
77-899 ..... 9/33 RJ-3250 . »............ 11/47 TRC-205 ............ 12/40
77-963 ..... 3/42 RJ-3600 .............. 11/48 TRC-209 ............ 10/63
78-574 9/38,12/39 TRC-209(GRE7189PLL-VC)
79-892 ..... 3/49 PEARCE ................... 12/49
79-893 ..... 2/20 TRC-410 ............ 12/29
79-900 ...9/33,34 Simpson Léopard B..... 3/49 TRC-420 ............ 12/41
3001 .... 12/37 Simpson Tiger 40A..... 9/34 TRC-421 8/44,12/41
4001 (77-004) ..... 7/52 Supertiger 40A......... 3/60 TRC-421A ............ 9/35
5001 .... 12/37 TRC-422 ............. 8/45
7001 (79-007) ..11/45,46 TRC-422A ........... 10/64
78-999(02A) ........... 12/7 TRC-424 ....... 3/57,9/35
79-891(02A) ........... 12/5 TRC-425 ............. 7/53
 SECRET CB
■ INDEX
—■ ■ ■ 'd■ ):
(C.1 ont ■
SPECIFIC RADIO TUNEUPS (Cont.
REALISTIC (Cont.) VOL/PG ROYCE (Cont.) VOL/PG SONAR VOL/PG

TRC-426 .............. 10/64 1-655 ................ 11/50 FS-2340 ............. 5/31

TRC-427 ............... 8/45 1-660 ................. 2/42
TRC-428 .............. 11/48 1-673 ................. 3/52 SPARKOMATIC
TRC-431 ............... 4/37 1-675 ................. 3/53
TRC-432 .............. 11/48 1-680 ................. 3/52 SR42/CBM ............ 3/54
TRC-440 .......... 8/45,9/35
TRC-441 .............. 11/49 SBE SURVEYOR
TRC-448 ......... 3/51,10/64
TRC-449 ....... 3/51,9/35,36 26CB1A ................ 3/61 2620 ................ 3/55
TRC-452 .......... 1/21,3/52 42CB Cortez 40 ........ 3/61 2610 ................ 3/54
TRC-454 ............... 8/45 44CB .................. 9/36
TRC-455 ............... 3/60 45CB Trinidad III ..... 3/61 TEABERRY
TRC-457 ............ 9/35,36 49CB Tahoe 40 ......... 3/53
TRC-458 .............. 10/64 47CB .................. 3/53 Model T .............. 3/55
TRC-461 ............... 3/51 43CB .................. 3/53 T Charlie .......... 10/65
TRC-462 ............... 9/36 LCB-8 (UPD2816C) ...... 12/43 T Command ........... 3/55
TRC-466 ............... 3/51 LCM-5 Land Command..... 9/36 T Dispatch .......... 3/55
TRC-468 ............... 3/51 LCM-8 ................. 9/36 Racer T ............. 3/55
TRC-470 ......... 9/39,12/41 LCM-8 (PLL03A)......... 12/42 Stalker II .......... 1/21
TRC-471 ............... 8/45 LCMS-8(uPD2816C) ..... 12/43 Stalker III ......... 7/55
TRC-480 ............... 7/53 Stalker IV ......... 12/44
TRC-490 .............. 11/49 SEARS Stalker V ........... 7/55
Stalker VIII ....... 10/65
ROBYN CM-6000LA ............. 3/59 Stalker IX......... 10/65
CM-6000LC............. 3/59 Stalker XII ......... 7/56
WV110 ................. 3/56 Roadtalker 40 ......... 2/43
WV110 Update ......... 11/50 370-38050700 .......... 3/54 TENNA
LB120 ................. 3/52 562-38200700 .......... 3/55
DG130D ................ 3/56 663-38020800 .......... 7/53 11302 (AM,FM,CB) .....9/37
007-140 ............... 3/52 663-38070700 .......... 3/61 10902 .............. 10/65
T240D ................. 3/56 934-38061700 ........ .11/50
SX-401 ................ 3/57 934-38062700 ......... 10/65 TRS
SX-402D ............... 3/57 934-38080700 .......... 9/37
GT-410D ............... 3/57 934-38081700 .......... 9/38 Challenger 600 .......9/37
AM500D ................ 3/57 934-38120700 .......... 3/61 Challenger 850 ...... 7/55
SB-505 ................ 5/42 934-38260700 .......... 7/53 Challenger 1200 .... 12/44
SB-520D ............... 2/22 934-38270700 .......... 7/54
934-38310700 ....... 7/54,55 TRAM
ROYCE
SHAKESPEARE D12 ................. 3/54
582 (PLL3001) ......... 12/42
604 .... 12/42 GBS240 ................ 3/53 TRUETONE
607 12/42
1-617 ................. 3/52 SHARP CYJ4832-A-87 ........ 2/43
1-619 ................. 3/56 CYJ4837-A-87 ........ 3/59
1-621 ................. 3/57 CB-800 ................ 2/42 CYJ4862-A-87 ........ 9/39
1-625 ................. 3/56 CB-2170 .............. 12/43
1-639 ................ 12/41 CB-4370 .............. 12/43 UTAC
1-641 ............ 3/60,4/51 CB-4470 .............. 12/44
TRX-400 ............. 3/59
1-651 ................. 7/55 CB-4670 ............... 7/55
TRX-500 ............. 3/56

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 SECRET CB INDEXŒont'd) :
SPECIFIC RADIO TUNEUPS (Cont.)
VECTOR VOL/PG WARDS VOL/PG

X................................... 2/43 GEN-775A ............................ 3/61

770 ........................... 9/37
790 ................................. 9/37

****************************************************************************************

VOLUME 1
PAGE #
CRYSTAL CROSS REFERENCE GUIDE 5-10
LETTER CHART FOR CRYSTALFREQUENCY CORRELATION 11-18
GENERAL INFORMATION 63-67
LINEARS 68-70
40 CHANNEL PLL SWITCH 71-72
*************************************************************★**************************!*

VOLUME 2
PAGE #
NEW CRYSTAL CROSS REFERENCE GUIDE 5-9
LETTER CHART FOR CRYSTAL FREQUENCY CORRELATION 10-13
ANTENNA REPORTS 53-55
BETA-COM INFO (Upgrading 23 channel radios) 57-87
*****************************************************************************************

VOLUME 3
PAGE #
SUPER MOD. IV (Frequency Counter Kit) 16-18
MICROPHONE WIRING INSTRUCTIONS 26-32
PLL CHANNELIZER 33-40
ANTENNA SECRETS (K40 Stud Mount forBig Stick) 63-64
SPECIAL SECTION ON LINEAR AMPLIFIERS:
50-70W Mobile 66
3OO-4OOW Base 67-69
70W Base 70-71
Eagle 200 72
Eagle 500 73
CONVERSION FROM AMATEUR TRANSMITTERTO LINEAR AMP 74
LINEAR AMP PROBLEMS & SOLUTIONS 75-76

t****************************************************************************************

VOLUME 4
PAGE #
HOW TO BUILD YOUR OWN RELAY MODULE 16

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 SECRET CB INDEX (Cont'd):
VOLUME 4

(Cont.) PAGE #
02A CHIP INFORMATION 54-55
TURNER MIC EXPANDER (500AMC Disable) 62
<40 BLINKIE 63
SUNSPOT PREDICTION CHART 64
LINEAR REPORT SECTION:
D & A Maverick 65
D & A 500 Triple Conversion 65
Eagle 515 Modification 66-67
UNIDEN SSB 10 METER POWER CONVERSION 68-70
SUPER CLARIFIER DIODE 71

****************************************************************************************

VOLUME 5
PAGE #
10 METER CONVERSION MICROCOMPUTER (Micromonitor PLL) 1-5
ECHO BOX 6
250 WATT DUMMY LOAD 7
BUILT IN POWER MIKE 8-9
5-MILE SIMULATOR 10
RECEIVER PRE-AMP 11
GLEN DIGITAL CONTROLLER 12-13
GETTING SWR DOWN ON BASE ANTENNAS 15
APARTMENT ANTENNA 16
GROUNDING MOBILE RADIOS 17
OOPS! WE GOOFED! 17-18
Vol. 1, Page 23 18
Vol. 2, Page 20, 21 18
Vol. 3, Page 4, 7, 11, 25, 25, 33 18
Vol. 4, Page 5, 45, 50 17
THE ART OF WIDEBANDING 858 CHIP 44
CONVERSION KIT + MARS & CAP FOR SSB 48-49
CONVERSION OF AM/SSB TO 10 METER AMATEUR 52
REDCO UFO INSTALLATIONS 61-70
SLIDE INCREASE, ALL SSB RADIOS 71
RADAR COMMUNICATOR 72
****************************************************************************************

VOLUME 6
PAGE #
PLL CRYSTAL CROSS REFERENCE GUIDE 1-2
SECRET CB TEST TONE 13
ERRONEOUS SIGNAL LOCATOR 14
LOW COST AMATEUR CONVERSION FOR 10 METERS 15
BASE ANTENNA GROUNDING 16-17
SUPER CLARIFIER 10-TURN POT 22

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 SECRET CB INDEX (Cont'd):
VOLUME 6

(Cont.) PAGE #
OOPS! WE GOFFED! 25
Vol. 5, Page 19, 20, 28 . 25
THUMBWHEEL 200 CHANNEL CONVERSION FOR 858CHASSIS 31-34
REDCO UFO APPLICATIONS 40-52
SPECIAL SECTION ON LINEAR AMPLIFIERS:
PDX 400 54
D & A Maverick 250 55
Maco Duster 300, 750 & 1000 Transmitter 56-57
Maco 75 58
500 CX & 700 CX 10 to 11 MeterConversions 58
RDX-75 59
HDX-50 59
MDX-200 60
PDX-400 61
10 METER EXPERIMENTER BOARDINFORMATION 62-63
SUPER CLARIFIER HINTS 66
REDCO DX-50 68-70
****************************************************************************************

^QLQME 7
PAGE #
HOW TO MAKE YOUR EAGLE SCREAM 14
IMPROVED SLIDE MODIFICATION FOR 02A SSB RADIOS 42
UPDATED 200 CHANNEL AMATEUR CONVERSION FOR 858 CHIP 43-48
10 METER CONVERSION FOR SSB RADIOS USING MB8719 CHIP 49-50
HOW TO MAKE YOUR 858 CHASSIS SLIDE 56
LINEAR AMPLIFIER NOTES 57
ECHO BOX SPEECH PROCESSING FOR TRC-449 60
ADDING PING 61
CORRECTION TO THUMBWHEEL 200 CHANNEL CONVERSION 62-63
MICROMONITOR TECH NOTES 64-69
MICROMONITOR INSTALLATION INSTRUCTIONS FORRADIOS USING 858 CHIP 70-71
AMP FOR RF PROBE 72
OSCILLOSCOPE MODIFICATION FOR RF & MODULATIONDISPLAY 73
THE ’’BANDIT” ANTENNA 74-76
EXPO 100 KIT 76
SECRET CB’S OWN "TROUBLESHOOTER” 77
****************************************************************************************

VOLUME 8
PAGE #
WHAT"S NEW ON THE ELECTRONICS HORIZON? 1-6
UHF FM CB (GMRS) 7-10
UNIDEN MB8719 PLL CHIP FREQUENCY CONVERSION 15
FREQUENCY MOD. FOR J.C. PENNEY, COLT, LAFAYETTE, HYGAIN, ETC. 18
BROWNING MKIVA MOD. & UFO INSTALLATION 22-23
BROWNING MKIV TRANSMITTER TROUBLESHOOTING 25-32
 SECRET CB INDEX (Cont'd):
VOLUME 8

(Cont.) PAGE #
OOPS! WE GOOFED! 41-43
Vol. 5, Pages 31-34 41
Vol. 7, Pages 31, 37 42-43
LINEAR AMPLIFIER NOTES:
Installing & troubleshooting Linear Amplifiers 47-49
10 Meter Amp board modification to upright driver 50
YOU CAN BUILD IT
Two-Tone Generator 51
Yaesu 601(B) frequency counter modification to read CB Low, Middle, High
frequencies 52-54
RF Test Meter 56-57
REDCO UFO MODIFICATION(form 20 to 29.995MHz) 55
SECRET CB’S POWER VECTORING 58
HOW THE ECHO BOX CAN ACTUALLY SURPASS THE POWER OF A LINEAR IN SSB 59
MICROMONITOR QUESTIONS 60-62
MICROMONITOR INSTALLATION INSTRUCTIOSN:
SM5104 PLL 63-64
ICOM 22S 65-67
NEW PRODUCT RELEASE:
Zapper 9000 68-69
Redco Digi-Scan UFO Elite 70
Chopper Charlie Antenna,Model 64 #5 71
Troubleshooter 73
*****************************************************************************************

VOLUME 9

PAGE #
SSB’ers LOSE OUT AGAIN 1
FCC ANNOUNCES PLANS FOR SIDEBAND 2-3
FCC DELAYS NPRM; SSB FREQS. DOUBTFUL 3-4
PRODUCT REVIEW; SPEED-O-MATIC "SPEEDO-l" X-BAND RADAR GUN 5-6
RELAY CRYSTAL SWITCHING 25-26
LETTER FROM A FRIEND 27-28
HINTS & KINKS-ELECTRONIC CRYSTAL SWITCHING 29
SOLVING T.V.I. 40-42
IMPORTANT FACTS ABOUT ECHO BOXES 43-44
VOICE SIGNAL BOOSTER (VSB-1) INSTALLATION 45-48
POWER SUPPLY MODIFICATION FOR REALISTIC PRE-AMP NOISE-CANCELLING MIKE #21-1175 49-50
HINTS & KINKS- SWITCHABLE MODULATION INCREASE 51
RF ATTENUATOR 52-54
PRESIDENT SERVICE BULLETINS 55-61
OOPS! WE GOOFED!
Vol. 8, Page 17 29
Vol. 4, Page 51 44

**************lx***********************************************************i************^

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SECRET CB INDEX (Cont'd):
VOLUME 10

PAGE #
LETTER FROM VIC 1
SECRET CB1 S TROUBLESHOOTER 2-4
VOICE SIGNAL BOOSTER- "VSB-1" 5-19
INCONVERTIBLE CHIP LIST 66
MODULATION ADJUSTMENTS FOR NEW RADIOS 67
LINEAR SUGGESTIONS 68-69
JAPPER INSTALLATION HINTS 70
OOPS! WE GOOFED!
Vol. 3, Page 33 71
Vol. 5, Page 24, 28 & 48 72
Vol. 8, Page 16, 17 72-73
Vol. 9, Page9, 51 74-75
Vol. 9, Page 29 72
****************************************************************************************

VOLUME 11

PAGE #
CPI ALC MODIFICATION FOR INCREASED SSB POWER 9
VSB-1 UPDATES 25-26
NEW FRONTIER: FM CB 27-29
NEW PRODUCT: DIGI-SCAN DS-400 30-31
COMING ATTRACTIONS-SERIAL DATA/PLL FREQ. SYNTHESIZERS 32
UNCONVERTIBLE AT THIS TIME-GE 3-5900A TC9109P 33
ZAPPER 9000 INSTALLATION UPDATES 34
RADIO MODULATION ADJUSTMENTS FOR VARIOUS BRANDS/MODELS 51-53
HINTS ON SERVICING 54
SERVICE NOTES-GOLDEN EAGLE MARK IV TRANSMITTER 55
D104 & D104M6 ASTATIC MIKE MODIFICATION 55
HOW TO SOLVE NOISE PROBLEMS 56-58
MORE ON THE "TROUBLESHOOTER" 57
IN HOUSE VALUE LISTING 59
HOW TO BUILD 60-71
PLL PINOUT DIAGRAMS 72-77
THE "BANDIT" ANTENNA 53
OOPS! WE GOOFED!
Vol. 3, Page 25 78
Vol. 6, Page32 78
Vol. 7, Page 43,53,63 78
Vol. 8, Page52 78
Vol. 10, Page 3 78
858 AM CONVERSION 35

t***************************************************************************************i

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 SECRET CB INDEX (Cont'd):
VOLUME 12

PAGE #
SIMPLE CURE FOR RX-TX TRACKING PROBLEMS 21
VSB-1 HOOK-UP:
Teaberry Stalker XX 25
Realistic TRC-490 25
Wards GEN-719A 25
MODULATION ADJUSTMENTS FOR VARIOUSREALISTICS 33
ZAPPER 9000 REFERENCE CHART 46
ZAPPER TROUBLESHOOTING HINTS 47-48
TC9106 PLL OPERATION ANALYSIS 50-53
THE "SPREAD EAGLE" ANTENNA BREAK-THRU FOR TRUCKERS 54-55
BASIC PLL 56
ELECTRONIC TERMINOLOGY 57
SCANNER PROGRAMMING TIPS 58
INTO THE KNOW WITH JAPANESE SEMICONDUCTORS 59
TRANSISTOR SPECIFICATIONS 60
RESISTOR COLOR CODE 61-62
YOU CAN BUILD IT
"Secret CB’s" Super-Duper PowerSupply Controller 63
Audio Test Station 64
Power Line Filter 65
OPPS ! WE GOOFED !
Vol. 4, Page 38 66
Vol. 10, Page 10, 16, 28 66
Vol. 11, Page 3, 10, 15, 16 & 71 66
"SECRET CB" INDEX ON VOLUMES 1 THRU 11 67-68
"SECRET CB" BOOK ORDER FORM 79

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