INSTRUCTION
MANUAL
FT-200
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YAESU MUSEN CO., LTD.BLOCK DIAGRAM
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RadioAmateur.EUFT-200 SSB TRANSCEIVER
The YAESU model FT-200 Transceiver, for HF amateur bands 80 through 10 meters, is
B (USB and LSB selectable), CW
and AM modes of operation, with @ two-tone power of 240W (approx. 300W speech peak
input),
High stability is obtained by use of a well designed heterodyne VFO, and the specially
de
ts compact size, light weight, and attached carrying handle make it very suitable and con:
venient for both home and portable use.
Other features include VOX, 100 ke calibrator, #5 ke receiver offset (clarifier) tuning and
easy connection for use of our FLDX-2000 Linear Amplifier.
YAESU FP-200 matching AC power supply with built-in speaker is especially designed for
200 Transceiver. A 12V DC supply, the Di
1 precision built high performance transceiver providing
ed 9 MC crystal filler ensures good voice quality.
use with F
C-200, provides for mobile or field use
GENERAL SPECIFICATIONS
Modes A3J SSB (USB-LSB), A3h (AM), Al (CW)
Input power 240w
Frequency range 35-4; I-75; 14-145; 21-215; 285-29
(crystals optionally available for ranges 28-28.5; 29-29.5;
29,5-30 MC)
Antenna impedance 50-75 ohms
Frequency stability After warm-up, within 100 eps) every 30 minutes
Carrier suppression -40 4B
Sideband suppression 50 dB at 1000 cps
Third order intermodulation
products 30 dB (PEP)
Bandwidth occupation 99.8%
AF. bandwidth 300-2700 cps
Receiver sensitivity 0.5 uV input S/N 10 4B
Selectivity 2.3 ke (6 dB), 4 ke (-60 dB)
LF. interference ratio 50 dB
Image ratio 50 dB
Audio output IW at 10% distortion
Audio output impedance 8 ohms and 600 ohms
Power supply AC or DC with separate power supplies
Tubes & semiconductors 16 tubes, 15 diodes, 7 transistors
Dimensions 133%" (335m/m) wide, 5%” (140m/m) high, 11" (280m/m) deep
Weight 17.5 Ibs (8 ke)FP.200 SPECIFICATIONS
Semiconductors 13 diodes
Dimensions 8°(200m/m) wide, 5%" (140m/m) high, 11” (280m/m) deep
Weight Approx. 22 ths (10 ke)
Speaker (built-in) 12.8 7.7 om
Supply voltage 100V/110V/117V/200V/220V/234V 50-60 eps
DC-200 SPECIFICATIONS
Matching DC power supply
Semiconductors 4 transistors 9 diodes
Dimensions 8" wide, 2” high, 87/6" deep
Weight Approx. 6.6 Ibs
Power source DC-12V, 12.54 (receive), 1SA (transmit), 27A (transmit 10OW
peak)
CIRCUIT DESCRIPTION
It can be seen from the block diagram that many sections are common for both receiving
and transmitting, For an easier understanding of the operation, the receiving and trans-
mitting sections will be described separately
Receiving Section
Signal from ANT terminal passes through antenna RX/TX relay to ANT input tuned circuit
to grid 1 of RF amplifier tube V2, 6BZ6, Signal is amplified, and through the next tuned
circuit on the grid of receiver mixer tube VI, GUS, pentode section. Loe:
oscillator signal is
applied to cathode of this mixer and the LLP. signal appears at mixer plate. The LP. signal
then passes through the 9 MC crystal filter to the two stage amplifier V104, 6BA6, V103,
0BZ6 and thence to VIO2A. %12AX7 power grid detector. This detector acts as a product
detector, with BFO signal applied to its cathode, when receiving CW and SSB, V102B,
%12AX7 functions as an anode detection type amplifier of AGC. With no signal applied
plate current is zero with phite voltage zero. When signal is applied, plate current develops,
resulting in a negative plate voltage which is applied through diode D103 to AGC fine. Circuit
provides suitable AGC characteristics of fast attack, slow decay for SSB and CW. Internal
resistance of diode is low in forward direction and high in reverse direction. AGC voltage is
applied to RF and IF stages so that a wide range of signal levels can be handled,
Detector output is fed to silicon diodes D101, D102, ANL. then via AP gain control,
Uirough 6BMS AF output tube to speakerTr
itting Section
Output of carrier oscillator V10, 12AU7 is injected to first grid of V107, 7360 balanced
modulator, and audio signal from mic, Amp. to modulating erid of BM. Suppressed carrier
DSB is developed at plate of BM. This signal then passes through the crystal filter XFIOL
which eliminates one sideband thus resulting in a SSB signal. 9 MC.
For AM transmission (sideband with carrier insertion, the BM becomes unbalanced due
to switching circuitry. permitting carrier to pass through, and also carrier frequency is shifted
by means of a varicap diode circuit so that carrier passes freely through filter passband
Amount of carrier insertion level is adjustable by AM carrier control VR8.
For CW transmission, audio is disabled, and similarly as for AM, the BM is unbalanced and
carrier frequency shifted to allow full carrier to pass through filter.
In the TUNE condition, a 1500 cps signal from the audio tone oscillator TR503 is applied to
the BM, This provides a convenient tuning signal near filter center frequency. Level of signal
is controled by mic. gain control
The 9 MC signal after passing through the filter is amplified by IF amplifier tube V104.
6BAG, thence to grid of mixer tube V4, 6EJ7. together with local oscillator signal. The
resultant difference between these two frequencies appears at plate tuned circuit of mixer
and is the transmitting ham band output signal frequency. On 14 MC band, additive mixing,
is used.
‘This signal is amplified by V5, 12BY7 tuned driver and finally to power amplifier tubes
V6/V7, 2 x 6JS6A, and antenna. Power amplifier V6/V7 operate in class AB2 for maximum
power output.
‘The AC audio component of PA grid current, when overdriven by signal peaks, is rectified
by diodes D4/DS to provide an ALC (Automatic Level Control) voltage to the IF amp. stage
thus reducing its gain and maintaining low distortion
The PA Pi network plate circuit provides attenuation to the higher order harmonics and
enables easy, flexible adjustment of impedance matching to antenna feedline.
On phone, PTT and VOX control is available. On VOX, a sample of signal from microphone
is applied to grid of V8 then to V9A, rectified by diode D2, SH-I producing a positive bias
on to grid of VB relay tube, causing plate current to flow and relay to actuate.
On CW, “straight” or “break-in” keying methods are available, Break-in produced by keying
audio oscillator tone applied to VOX amp. as well as transmitter bias line, The relay switches
bias on VIO7, V4, V5. V6 and V7.
Tone signal also can be heard from speaker while keying, thus providing sidetone monitoring,
OSCILLATOR CIRCUITS
In the FT-200 crystal oscillators are used for carrier generation and the bandswitched
heterodyne oscillator, together with a self-controlled oscillator for VFO which is at a
frequency low enough to obtain good stability. Other oscillators included are 100 ke crystal
calibrator and audio tone oscillator. An optional crystal oscillator and components are
available for fixed channel operation1. Carrier crystal oscillator
V106, 12AU7 double triode with crystals 8998.5 ke and 9001.5 ke, one in each triode
scetion, With sideband selector switch at NORMAL, carrier crystal 8998.5 is operative
for 7 and 14 MC band, and 9001.5 for 3.5, 21 and 28 MC, When the selector switeh is
in REVI
Carrier oscillator operates as the BFO when in receive mode.
On AM & CW, crystal 9001.5 is used and its frequency is lowered 200 cps by diode
switch D104, 1$1007, bringing carrier into filter passband
ERSE position then the carrier crystal oscillator sections ure changed.
2. Bandswitched heterodyne os
This is @ erystal oscillator using silicon type 2SC372 transistor, and is operative on
bands 7, 21 and 28 MC. 10 M band crystal is included for 28.5~29 MC. and positions
are available for other three optional ranges for full coverage of 10 M
3. VFO self-oscillator
A transistorised Colpitts circuit with 28C372 oscillator and 2SC372 buffer. It has linear
tuning over the range S~5.5 MC. A passband filter circuit at output is tuned to pass the
5-5.5 MC range. Varicap diode D401, 18145 permits CLARIFIER control #5 ke
on receiving,
4. Crystal calibrator oscillator
Transistor oscillator 2SC367 with 100 ke crystal, and diode type 1S1007 harmonic
generator provides accurate check points every 100 ke on main dial.
AF oscillator
Phase shift type with 28C372 transistor, generating audio tone signal at 1500 cps
supplies transmitter tune-up signal and CW sidetone monitoring
LOCAL OSCILLATOR MIXER CIRCUIT
VFO output is applied to grid | of V3, 6CB6 mixer and heterodyne oscillator output to
cathode. Resultant beat frequency is selected in plate tuned circuit.
METER CIRCUIT
Meter is | mA movement, and is connected to 2nd IF stage to read change in cuthode voltage
of V103, resulting from variations of AGC voltage, to indicate receiver “$* units. Meter is
automatically switched by relay RLIOI, on transmitting, to indicate relative power output,
PA cathode current, and ALC voltage. Meter scale is fully calibrated, and transmitter
metering functions PO, IC and ALC are selected by panel mounted slide switch.VOLTAGE REGULATOR CIRCUIT
The voltage regulator eiteuit, mounted on a print board. provides 9 volts for all transistor
and 2SC
together with two zener diodes
or VRSOI
escilkitors, Two transistors are used, 2SC
IS331 and 183
and voltage level c set by adjustment of variable res
CONNECTIONS FOR USING FL-DX-2000 LINEAR AMPLIFIER
F
RE OUT
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FRONT PANEL CONTROLSPhones
2. Mic.
3. Function
4A. AF Gain, Pull-ANL-On
4B. RF Gain
5. VFO
6 Cal
7 & 8.Band
9. Oper-Ree-Cal
10. Clarifier
Headphone socket
When plug is inserted into socket, speaker is automatical
ly disconnected.
Microphone socket. 3 contact T.R.S. type.
Function switch.
OFF AC power removed from power supply.
SSB Selects SSB operation,
TUNE Places TX in tune-up condition.
cw Selects CW operation.
AM Selects AM operation.
Knob
Level control
Control knob and vernier drive.
One revolution of knob covers approx. 15 ke. Upper
windows give 50 ke points with 0-500 markings. The
vernier scale is marked in 1 ke steps, 0-100.
This is a locking knob used to set dial calibration in
conjunction with the 100 ke calibrator. With transceiver
in receiving condition, the vernier dial is turned to “0”
and locked by a half turn of this CAL locking knob.
100 ke calibrator is switched on with control No. 9 then
the VFO knob is rotated to a 100 ke point so that
calibrator beat note is heard, then adjusted for zero-beat
Locking knob is then released.
Bandswitch, marked for bands in MC. Red colors
indicate that red scale is to be used on VFO dial. The
various 28 MC ranges are selected by knob No. 8, when
No. 7 is at its fully lockwise position.
Lever switch. Selects functions of calibrator receiving
and transmitter operation.
Clarifier adjustment, Provides +5 ke variation of receiver
tuning (“off-set-tuning”) When switched to OFF, then
receiving and transmitting frequencies are the same.lo.
Grid
Mic. Gain
Plate
Loading
POAC-ALC
Sideband
PYT-VOX
Controls RF tuning of receiver and drive tuning of
transmitter,
Controls microphone amp. level. On TUNE it becomes
1 tuning level control
Knob. Adjusts PA plate tuning.
Lever. Adjusts PA plate loading.
For switching from VFO to crystal control operation
for fixed channel working, This knob is operative only
when optional fixed channel switch and kit is installed.
Meter selector switch. Switches meter functions’ for
transmitter metering,
Sideband selector slide switch. In the NORMAL position,
LSB is produced on 3.5 and 7 MC and USB on 14, 21
and 28 MC. In the REV position, USB is produced on
3.5 and 7 MC, and LSB on 14, 21 and 28 MC.
Slide switch. Selects PTT or VOX functions.
REAR PANEL CONTROLS & CONNECTIONS
eee1. RF Out
ANT.
Power Supply Connector
4, Speaker Socket
5. Accessory Socket
6. Earth Terminal
7. Key Socket
8. VOX Gain
9, Anti-Trip
10. Delay
11. Relay Sens
12, AM Carrier
13. Bias
14. Meter Sens
1S. Meter Zero
Step 1 of Operation
FUNCTION
RF-AF-GAIN
BAND
CLARIFIER
PLATE
LOADING
METER SWITCH
OPER-REC
SIDEBAND.
MIC GAIN
CAL
Provides low level RF drive for FTV-050 VHF transverter.
Antenna coax socket.
(see P, 18 for details)
(see P. 18 for details)
Adjusts VOX sensitivity.
Adjusts VOX anti-trip level.
Adjusts “hold-in” time of VOX
Adjusts operating level of VOX relay
Adjusts level of reinserted carrier for AM operation.
Adjusts bias on PA tubes.
S-meter sensitivity control
Adjusts S-meter zero setting
OPERATION
POWER OFF
RF maximum clockwise
AF about half on
Set to desired band
OFF
Set to desired band
Minimum loading
Ic
REC
NORMAL,
OFF
In released position
-8-Set controls as shown below
First check that all eable connections are correet and that antenna of eorrect frequeney
and impedanice within the range of the Pisnet (50-- 100 ohms) (coax output) is connected
to the transceiver. AC power plug should not be connected until all preliminary checks
are carried out
Turn power on with function switch to SSB position, Panel lamps should light and
S-meter needle will show a full s
le reading then slowly return to “O" as set warms up.
This can be accepted as an indication that the set is then ready for operation.
Tune GRID for noise peak.
Adjust main tuning dial for signal
Peak GRID for maximum $-meter reading,
Careful tuning is necessary to obtain correct tone of SSB signal. If the received signal is
on opposite sideband then move REV-NOR switch to REV.
A beat note indicates an AM signal being received. In this event turn function switch
to AM
Adjust AF gain for comfortable listening volume. Sometimes a slight reduction of RF
gain will obtain clearer reception
Transmitter tuning
Transmitter should be tuned into a SO ohm dummy load, but it may be tuned on
an antenna provided that the band is clear, and no interference will result to other
stations. Take care to ensure that transmitter frequency is adjusted within limits of
band in use.
DO NOT OPERATE TRANSMITTE
could be damaged.
Disconnect microphone, meter switch to IC, MIC gain off, control switch to PTT,
function SSB, Then when REC-OPER switch is moved to OPER. and using power
supply of 600V HT, the meter will indicate the PA resting current,
This should be 60 MA, if not, then adjust bias control at rear.
Now turn FUNCTION switch to TUNE, advance MIC gain to obtain a small increase in
meter reading, up to about 100 MA. and adjust GRID for maximum IC. Note that the
setting for the GRID control will be virtually the same as was found for receiving.
with no load connected otherwise PA tubes
Reduce MIC gain if IC rises abnormally high.
Adjust PLATE for minimum dip in IC, Switch meter to P.O. and adjust PLATE and
LOAD controls in turn for maximum RF power out. IC should dip to about 70/80% of
the off-tune current for best loading condition. At maximum input the IC is about 350
MA, but refrain from using this high current for longer than a few seconds, therefore
make all adjustments quickly. During tune-up, switch REC-OPER switch off periodical-
ly to reduce the time transmitter is on with high IC
While it is permissable to tune transmitter using meter on P.O. po:
jon, it is recom-
‘mended that an external SWR meter be connected between antenna socket and feedline,
not only to check matching of transceiver to antenna feedtine and observation oftransmitter RF output, but so that transceiver meter can be left in IC position for
constant monitoring of PA current, Any abnormal rise-in IC can then be noted ant
quickly corrected.
Transmission
SSB (A3J)
Insert microphone plug of PTT microphone. (If microphone does not have a PTT
OPER
switch, then short out PTT terminals on plug and control transceiver with REC
panel switch.)
Turn REC-OPER switch to OPER.
While speaking, adjust MIC gain for correct IC meter “kick-up”. Switch meter to ALC
and check that needle does not rise above limit of green section of scale on speech
peaks. Indicated IC will be about half the tuning IC. ie, about 150 MA on peaks.
Attempting to obtain more power by “forcing” or overdriving the transmitter will
obtain only an insignificant increase in strength and will result in a distorted signal with
possible radiation of spurious emissions. Keep MIC gain down, speak fairly closely to
microphone to reduce background noise pick up, and try to maintain an even level
of speech.
Do not have VOX gain control set too high otherwise operation will be unstable. If
antitrip control is advanced too far. then VOX will lose snesitivity. Set anti-trip to
a position where it is just preventing speaker noise from “triggering” the VOX. If VOX
fails to function, check that microphone has sufficient sensitivity and if OK then
replace V9 and readjust relay sensitivity control.
cwian
Remove microphone plug. For CW operation on 7 and 14 MC. place Sideband switch
in REV position otherwise drive will be low. The varicap diode is connected to only
one cartier crystal (9001.5 ke) and this diode’s operation shifts carrier within filter
passband. Use clarifier control only for changing or tuning-in the received signal, e..
small readjustment to retune a drifting signal or adjusting pitch of received signal
Once main VFO control has been set to frequency of desired contact it should not
normally be altered. otherwise each station will be retuning and moving through
the band.
For break-in operation set control switch to VOX, and adjust VOX delay, ete. to suit
requirements. Do not hold key down for long p.
damaged. Use CW IC at 250 MA. MIC gain will control sidetone level
ods otherwise PA tubes can be
AM (A3h)
Place function switch on AM, MIC gain to “0”. Set AM carrier control st rear to give
IC of 150 MA. Adjust MIC gain so that speech deflects meter a further 5~10 MA.
As for CW set control to REV for 7 and 14 MC bands. PTT or VOX can be used in
the same way ay for SSB operation.ALIGNMENT
The F1-200 has been correctly aligned at factory and, under normal circumstances. re
ment should not be necessary except after a long period of use, The alignment of such
modern, sophsticated equipment ay this requires the correct test instruments and. should
hot be attempted unless one has had a reasonable amount of experience in such alignment
techniques,
N.B. Before any work is attempted,
equipment, so—-TAKE CARE!
remember that high voltages are employed in this
1. Equipment required
VTVM with RF probe
RF standard signal generator
AF signal generator
Circuit tester
Frequency meter
Dummy load 50 ohms
Suitable alignment tools
2. Voltage and resistance measurement
Refer to tables on Pages 20, 21 and 22.
Note that measurement figures obtained could vary slightly from those shown. particu
larly a tow resistance testing meter is used. Always turn off power, remove AC plug,
completely discharge all filter condensers, and wait until valves are cold before taking
resistance measurements,
3. Voltage regulator
The V.R. is mounted on a printed circuit board and supplies a regulated output of 9V.
adjustable by the pre-set type miniature pot VRSO1. If output cannot be brought up
fo the 9V level it may be due to a fault in components on the printed circuit board,
e.g. transistors or zener diode, or supply voltage below 11V.
4. VEO alignment
On the red scale. 5 MC and “500
Switch off crystal heterodyne oscillator by placing bandswiteh on 3.5 or 14 MC band.
Clarifier OF
Use frequency meter for alignment, although this can he done, with care. if beats are
heard every 100 ke
5.5. MC.
he crystal calibrator
Course alignment is by adjustment of trimmer TC401
The piston type trimmer TC402 is for adjustment of temperature compensation. If
turned clockwise then compensation becomes greater. If TC402 is adjusted then TC401
must be re-adjusted to maintain calibration
For precise adjustment of dial linearity, careful adjustment (by bending) of end rotor
plates of main tuning condenser as necessaryVFO injection to grid | of V3, 6CB6 should be 0.5V or more over full VFO range.
measured with VTVM and RF probe. To obtain same frequency of clarifier at "0" as
at “OFF”, adjust VRT.
Heterodyne crystal oscillator
Apply RF probe to Pin 2 of V3, and with bandswitch at 28.5, adjust L202 for maxi-
mum meter reading.
On 21 MC band adjust TC202.
On 7 MC band adjust TC201
If optional 10 meter range crystals are added use type HC18U crystals with wire leads
soldered into marked positions on heterodyne oscillator print board.
Adjust appropriate trimmer condensers for 10 meter crystals.
Calibrator 100 ke
Adjust frequency with TC301 by checking against WWV, with aid of separate receiver
| Check against VNG on 7.5 mc.
Pre-mixer (VFO mixer)
This is V3, with output plate tuned circuit to select resultant beat of VFO and
heterodyne oscillator (or VFO frequency in case of 3.5 and 14 MC bands).
This alignment should be carefully done as other frequencies can appear at output,
VFO, ete. This alignment is explained in transmitter alignment section. Refer to chart,
Page 14, for correct output frequencies.
RECEIVER ALIGNMENT
Band Mixed Frequency
35 5— 5.5 MHz
7.0 16-165
14.0 5-55"
21.0 30-305
28.5 375-38"
29.0 38-385"
29.5 38.5 — 39
Audio output stage
Connect audio generator with 1000 cps output of 0.1V level to moving arm terminal
of AF gain control, and with control at maximum volume, and output of | watt should
be obtained from the 6BM8, V101
AGC
Function switch to AM, RF gain maximum, then S-meter should read “0” with antenna
socket shorted. Set VR102 (AGC adjust) so that it is at a point just before S-meter
needle commences to rise above “0”. Now adjust meter sensitivity control so that,
with S.G. 50 uV signal to antenna socket meter will read $9. Open circuit output ofS.G, will be 100 uV dropping to 50. uV when
to loading effect of receiver. Now set function switch to SSB, short out antenna socket,
and meter should read “O", but if not then adjust the compensation capacitance (C165)
between pin 2 and pin 8 of V102 to make meter read minimum deflection.
is connected to antenna socket, due
3. LF. amplifier
Connect signal generator at 9,000 ke and adjust tuning for maximum S-meter reading
at center of filter passband by observing S-meter at same time as tuning $.G. frequency
Now adjust L101, L102, L103, L104 for maximum meter reading.
4. Receiver mixer
This is V1 6U8 (alternative types 6EA8, 6GH8). Connect RF probe to pin 8, cathode
of triode section, and adjust grid tuning. Oscillator injection should read greater than
0.5V on every band. Adjust trap coil L22 for minimum beat at 21.3 MC. This adjust
‘ment should occur within one turn of the core slug. LI is trap coil for 3.5 and 14 MC
bands and should be adjusted so that no oscillation in these bands. Use a plastic
alignment tool so that no damage will result to the internal hexagon type slugs,
5. RF amplifier
Connect S.G. to antenna. On 3.5 MC band set VFO to “0” on black scale and GRID to
second point up froar its anticlockwise position. Apply 3500 ke signal and adjust L7
and L12 for maximum $-meter reading. Use plastic alignment tool. 7 MC band, VFO
to “0” on red scale, GRID at same point as for 3.5 MC, $.G. at 7000 ke, Adjust TCL
and TC2 for maximum.
14 MC band, VFO to 250, GRID at center position, $.G. at 14250 kc. Adjust L10 and
LIS for maximum.
21 MC band, VFO to 250, GRID at center, $,G, at 21250 ke. Adjust L9 and L14
for maximum,
28.5 MC band, VFO to 250, GRID one point back from center, $.G. at 28750 ke.
Adjust L3 and L8 for maximum,
On either 7 or 14 MC bands, apply 9 MC signal of sufficient level to give a S-meter
reading, then adjust L2 for minimum dip in S-meter reading,
TRANSMITTER ALIGNMENT
‘The transmitter uses many common receiver circuits, therefore it is necessary to first
correctly align the receiver section. A S0-75 ohms dummy load must be used on the trans-
ceiver during transmitter alignment, Take care to avoid touching H.V. points!
1, Balanced modulator
Function switch to TUNE, meter to P.O., tune transmitter for maximum reading,
(Keep IC down by use of MIC gain.)
Now function to SSB, MIC gain to zero, and adjust VR106 for minimum reading. Formost sensitive indication, connect RF probe to dummy load, or use another receiver
ind observe its S-meter reading,
Then switch to opposite sideband position, and readjust VR 106. Repeat several times
for best result. If there is a marked difference between the two positions then adjust
ment of cartier oscillator or crystal filter may be required.
Crystal filter
The filter is aligned once in receiver alignment, but further alignment in this section
(transmitting) is necessary.
At the TUNE position adjust L103, L104 and L105 for maximum output. Keep drive
reduced to a fairly low level for the most accurate determination of the maximum peak.
In order to examine filter characteristics, set function to SSB and connect an A.F
generator to MIC jack, then take a curve of the A.P. response, (in effect, the filter
passband), by plotting between 300-2500 eps. If output level changes no more than
3 dB then it is OK. Repeat on reverse sideband, If the two curves do not match then
slight adjustment of each carrier crystal frequency is necessary to bring the two curves,
together in their frequency limits. If carrier is too close to 9000 ke filter center
frequency then high audio frequencies will be attenuated. If carrier too far removed
then low frequencies will be attenuated. Carrier frequency adjustment is by TC101
and TC102,
3. Driver stage
Set up transmitter on TUN
gain control, then adjust driver coils and trimmer condensers for peak in output, as in
E, but keep level down to safe limit by adjustment of MIC
receiver section alignment.
REDUCTION OF POWER OUTPUT TO 10W OR SOW LEVELS
The FT-200 is designed for 100W output but can be connected for lower output levels
For SOW. disconnect S.G. wire between V6 and V7, so that only V6 is then in use. IC readings
will be half of those for 100W
For 10W, after carrying out above modification, then power transformer HT secondary must
be tapped down from 480 to 240V
Chart shows operating conditions for the different power levels.
1oow sow
|
Final Tube Single Tube |
Votteze | soy |
SSB Resting IC 30m, |
TUNE Maximum | 7
IC | 350 400mA 175 ~ 200ma
AM Operation IC 160m — | soma | soma
IMPORTANT:
Heater voltage to final tubes 6JS6A is supplied through a jumper wire between pin 1
and 2 of accessory plug, so the accessory plug must be placed in the accessory socket to
provide this heater voltage.1 OISOA heater 7. ALC input ACC OUT
2 12.6V heater 8. Ground
3. +150V 9. Relay close on transmit
4, +300 10. Relay common
S. +600V 11. Relay close on receive
6. -100v
Power socket connection
1. -100V
LE
3.4300V
4.+600V
5. H COMMON
6. HAC 12.6
7. H COMMON
8. HAC 12.6V
9.
1. +150V
Plug connection
Mic Plug (PTT)
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Mic Plug
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Key Plug
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RadioAmateur.EUFP-200 POWER SUPPLY WITH SPEAKER
The FP-200 AC power supply is designed especially for the FT-200 Transceiver. A dynamie
ant below for
speuker ix included within the power supply cabinet. Refer to circuit di
Wetails, Note that the major HT winding is tapped 240, 460 and 000, providing DC outputs
of 300V, 600V or 800V to the final tubes. However, for the FT-200, 600V DC is sufficient
Tor rated output. If 800V is used then the input will be excessiveuse only on 60OV
DC maximum,
Bias section has only half wave rectifier as current drain is very small
Heater winding, 2 x 6.3V, 6A. is connected in series to provide 12.6V at 6A
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