Yaesu FRDX-400 Instruction Manual

FRox~ FOU
Receiver
_ INSTRUCTION
MX MANUAL
YAESU MUSEN CO., LTD.
TOKYO JAPAN.
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FRox-400
COMMUNICATION
RECEIVER
- YAESU MUSEN CO., LTD.
TOKYO JAPAN. |
GENERAL:
The model FR-DX-400 Communication Recciver together with its accessories is designed to be
used for SSB, CW, АМ or FM reception on amateur bands in the frequency range from 1.6 Me to
148 Мс. A citizen band (27 Mc) may also be covered as well as WWV.
Basically, it is a double conversion superhetcrodyne (triple conversion for VIIF bands) receiver
employing crystal controlled high frequency oscillators, highly stable variable oscillator tuning the
same range linearlly on all bands and for selectivity, the MECHANICAL FILTERs and T-notch
filter at the 455 Ke IF stage. |
A precise instrument type double gear driven dial together with an adjustable scale on the
main tuning dial knob provides casy and accurate frequency readings on all bands within approxi-
mately 1 Ke.
The receiver provides a wide variety of operations, such as rejection tuning, slow/fast AVC
time constants, squelch circuit, crystal controlled operation, monitor circuit, and a 100 Ke/25 Ke
calibrator.
The receiver can be used as a transceiver in conjunction with our FL-DX-SSB Transmitter.
SPECIFICATIONS
( ) option |
Operating range ......... 1.7—2.3 Mc, 3.5—4.1 Mc, 6.9—7.5 Me, 13.9—14.5 Мс, 20.9—21.5 Mc, 27.9—
28.5 Мс, 28.5—29.1 Мс, (26.9—27.5 Mc, 29.5—30.1 Мс, 9.9—10.5 Me) o
ÓN selectable SSB and CW with ring demodulator, AM with diode detector,
(FM with ratio detector) |
SeEnSitivitV cee cee eee, SoB, CW 0.5 uv S+N/N 10 db,
| AM 1.0 uv S+N/N 10 db
Selectivity ..,..,,.,......... 1 Ke at 6 db down, 4 Kc at 60 db down with rejection tuning: 2.4 Ke at 6
db down, 4Kc 60 db down: 4Кс 6 db down, 7.5 Кс at 25 db down: (600
cps at 6 db down, 1.5 Кс at 60 db down)
' Spurious responses ...... —60 db at 14 Mc: Internal spurious signals within amateur bands less than
that from a 1 uv antenna signal.
Frequency stability ...... After warm up, less than 100 cps for any 15 minutes: less than 100 cps for
10% line voltage change.
T-notch rejection ......... Better than 50 db.
Dial calibration............ 1 Ke.
Antenna impedance ...... 50—75 ohm unbalanced.
Audio output ............., At @ 5% distortion, more than 1 watt at 4/600 ohms.
Power consumption ...... 50 watts, 100/110/117/200/220 or 234 volts 50/60 cps
Dimensions .....,,...,.,.... 61/2” H, 14:/2” W, 11'/.” D
Weight .....,,.....,,.,,... ‘Approximately 25 lbs.
BLOCK DIAGRAM
г fé00c/s | u
lor | Potton
I— 6876 E BUSCH 6BE6 Her 12AT7 RAR 151007 sus Hessen |]
| oo
LH RCE 151007 |
PTT | u ne TT 7 x4
| 6m I ı FIX | CW SSB
| convertor | oscillator |
PUTT 7] IT TT |
| 2m 5] suse | 6BZ6 — 25C372 | 280372 | LE '!cwsro! BAT (ES
Convertor | Г
______ — Lo 1
PT
| 100KC 25KC |
| Marker |
Fig. 1
PRINCIPLES OF OPERATION
The block diagram provides you with a better understanding of this receiver. Double conver-
sion is adopted with injection voltage for the first mixer provided by a crystal controlled oscillator.
A tunable IF of 500 Кс range is used to couple the first and second mixer. Injection voltage for
the second mixer is provided by a Variable Frequency Oscillator with a tuning range of 500 Ke
ganged to tunable IF tuning capacitors. The 455 Ke output frequency is coupled through second IF
stage to separate AM, SSB, and FM detectors. Injection voltage to the product detector is provided
by a crystal controlled BFO,
RF AND MIXER CIRCUIT:
A signal from the antenna passes through a trap coil which minimizes interference caused by
the signals in the first IF range to the tuned circuit, and is applied to the control grid of the RF
amplifier tube, V101, 6BZ6. The tuning capacitor for RF amplifier and first mixer is ganged and
linked to the preselector tuning knob on front panel. The required tuning range of these tuning
circuits for band spread are obtained by switching appropriate values of fixed capacitance in parallel
with coils. The amplified signal from V101 is coupled to the grid of V102A, 6U8, first mixer. The
injection voltage from V102B, 6U8, is coupled to the cathode of V102A. The output signal from
the first mixer is coupled through L110, tunable IF transformer (5354.5 Ke—5954.5 Kc) to the grid
of the second mixer V103, 6BE6, with VFO injection voltage applied to the cathode of this tube.
E
SECOND IF AND DETECTOR CIRCUIT:
The output signal from the second mixer is connected either to one of four mechanical filters
МЕЪ MF2, MF3, or MF4 (МЕ! and MF4 not supplied). The mechanical filter МЕ? is centered to
— 2 —
459 Ke with a pass band of 2.4 Ke, and is selected for SSB or narrow band AM reception, while
MF3 with pass band of 5Kc is selected for wideband AM reception. МЕ? is selected for CW
reception also when MF1 is not supplied. МЕТ with pass band of 600 cps can be installed on the
filter assembly board for better CW reception. MF4 with pass band of 24Ke can be installed to
improve skirt response for FM reception. Output from the filter assembly is amplified through
V601B. The notch filter is composed of coil L 602 and capacitor VC601. The rejection notch
occurs at the resonant frequency of this tuned circuit, and is centered at 455Ke. The variable
capacitor VC601 is linked to the rejection tuning control with allows the rejection frequency to be
moved accross IF pass band. Optimum Q and depth of notch is determined by the proper adjust-
ment of potentiometer VR601. VC601 is so designed that shorts the filter circuit on the OFT posi-
tion. Output from Q multiplier is then amplified through the second amplifiers V104 and V105,
6BA6s. The cathode of V104 is combined to the cathode of V101, and connected to RF gain
control potentiometer, VR101.
S meter circuit is connected from B supply to the plate circuit of V105, 6BA6, of which the
plate current is decreased by the application of AGC voltage to its grid circuit.
The output singnal from IF amplifier is coupled to the ring demodulator circuit. It is also
coupled to AM detector and AGC dicde D101, 151007, and to FM limiter V501A, 608. BFO injec-
tion voltage is applied to the ring demodulator for CW and SSB reception.
OSCILLATOR CIRCUITS:
This receiver contains four oscillators. They are high frequency crystal oscillator, variable
frequency oscillator, beat frequency oscillator, and 100 Kc crystal calibrator.
High frequency oscillator, VIE, 608 „provides injection voltage for the first mixer. The
crystal frequency is always 59585 Kc re ES {ower ee ot the selected band. The
secondary winding of L112 couples injection voltage to the first mixer tube cathode circuit and
furnishes a DC return to the ground for the first mixer. | |
The VFO utilizes two transistors, 2SC372s, one of which oscillates at the frequency of 4900 Кс
to 550 Ke, and the other works as a buffer stage to prevent loading of the oscillator circuit. The
output from the transistor buffer is coupled to the grid of V107, 6BZ6 which works as second buffer
to prevents the loading by cable capacity when operated in transceiver service. Supply voltage for
the oscillator is stabilized by a regulator consisting of zener diode D113 and resistor R147. The
VFO output voltage from V107 is coupled to the first grid of second mixer, V103, 6BE6.
V108, 12AT7 is used for the BFO crystal oscillator, and the injection voltage is supplied to the
ring demodulator through L117. One of either cathode circuits is connected to the ground by the
MODE switch for appropriate sideband operation. For CW reception, BFO oscillator is also selected
by the MODE switch to reduce the interference caused by near-by signal.
These crystals provide the proper BFO frequency relationship to the mechanical filter pass band
to generate optimum audio response from the ring demodulator.
The crystal calibrator circuit provides marker signals at multiples of 100 Ke by FUNCTION
switch at CAL 100 Kc position. At 25 Кс position, marker signals are generated by a multivibrator
for accurate calibration between 100Ke marker points. Variable capacitor TC301 provides for
adjustment zero beat with WWV. The output signal from the circuit is coupled to the receiver
antenna circuits.
CONTROL CIRCUITS:
Signal voltage is coupled from L115 to a diode D109 and D100, rectifed to produce automatic
gain control voltage. Generation of AGC voltage is delayed until the signal voltage at the diode
exceeds the bias voltage determined by R148 and R157. C187, when switched into the circuit,
presents a longer RC time constant allowing for a smoothly developed AGC signal. The AGC
voltage is applied to the control grid of the RF amplifier and IF amplifier tubes.
Manual control of RF gain is accomplished by changing the cathode bias for RF amplifier and
first IF amplifier tubes. A voltage divider circuit consisting of resistor R104 and RF GAIN control
is connected across the B plus voltage line. At the maximum gain setting, this circuit produces
proper operating bias for the RF and first IF amplifier tubes.
At lower control settings increased bias is provided which reduces the gain. The DC return
of the RF and first IF amplifier tubes is connected through the RF GAIN control to the MUTE
terminal. The MUTE terminal is connected to MONITOR control and FUNCTION switch S101C.
"When the FUNCTION switch is placed in the REC position, a ground of the MUTE terminal
causes the receiver to opcrate in a normal manner. At STBY position, DC return is made through
MONTTIOR Control VR106. At the maximum setting of this control, MUTE terminal is connected
to the ground to provide the DC return. At the proper settings of the MONITOR controls, the
receiver gain recovers to monitor transmitter signals. The Jowest settings of the MONITOR
control produces cutoff bias to RF and first IF tubes, thus muting the receiver,
Rectified DC voltage from D101 is coupled through ‘R507 to the grid of squelch control tube
V501B, 608. V501B is so biased by VR105 that the tube is cutoff when signal is not received.
When the rectified DC voltage to the grid exceeds the cutoff bias, V501B conducts and pro-
_ vides DC return for the cathode circuit of the first audio amplifier tube V106A, 6BM8.
Lowest setting of SQUELCII control permit the receiver to opetate in a normal manner.
AUDIO AND POWER SUPPLY CIRCUITS:
Audio voltage from the appropriate detector is selected by MODE switch, S103C and is coupled
to the peak noise limiter circuit consisting of diodes D102 and D103. This limiter circuit is shorted
by $104 when it is not used. Signal from the limiter circuit is amplified by V106A and coupled
through AUDIO GAIN control, VR104 to the grid of V106B. Plate circuit of V106B is connected
to an output transfermer T101. Two audio outputs are provided. A 4 ohm output for the speaker,
and a headphone jack is connected to the 4 ohm terminal. When the headphone is used, the
speaker output is disconnected. A 600 ohm terminal may be used for antitrip output or phone patch.
The built-in power supply furnishes filament, plate, and transistor voltages for the receiver. The
tube heaters and pilot lamps are connected in parallel, and the voltage is supplied from the 6.3 volt
winding. Plate voltage is supplied by the full wave rectifier unit D111. Voltage for the transistors
is supplied by the full wave rectifier unit D112, and stabilized by the zener diode, D113.
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INSTALLATION
Before connecting the receiver to the AC line, examine for visible damage. If the receiver has
been damaged in shipment, notify the agent to receive warranty repairs. Check tubes and crystals
for proper seating in sockets, and check tuning controls and switches for freedom of action. The
receiver power transformer can be operated on either 100/110/117/200/220 or 234 volts AC, check
that the transformer connections (stamped on the rear apron of the chassis) are correct for the line
voltage available.
Figure 2. shows the location of jacks, socket, and terminal for external connections to the
receiver. J101 is a coax connector. J104 is an audio output terminal, and 4 ohm is for a speaker.
Terminal marked “M” is for the mute circuit. To connect the receiver for mute operation, a means
of shorting of M terminal to ground while receiving must be applied. Opening this M terminal
mutes the receiver. A set of normally closed contacts on a relay which is keyed with the transmitter
may be used for this purpose. To use this mute circuit, the receiver must be operated in the STBY
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position with MONITOR control at fully counterclockwise position. 600 ohm audio output may be
used to supply antitrip voltage to the transmitter used together. The phone jack on the front panel
is connected to the 4 ohm terminal, therefore, best results will be obtained if headphones used are
of 4 to 16 ohms impedance. The speaker is disabled when the headphones are plugged in.
Figure 3 shows a complete station interconnection for a FR-DX-400 receiver, FL-DX-400
transmitter, and FL-DX-2000 linear amplifier. When the VFO output jack is connected to the
transmitter for transceive operation, it may be necessary to adjust L116 to compensate for the
detuning effect of the coaxial cable.
CONTROL FUNCTIONS :
1)
2)
3)
4)
7)
8)
9)
10)
11)
12)
13)
14)
15)
16)
MONITOR :
SQUELCH :
REJECTION TUNING:
PHONE:
FUNCTION :
ANL:
MODE
MAIN TUNING:
RF GAIN:
АГ GAIN:
AGC:
BAND
CLARIFIER :
PRESELECTOR :
HF/6M/2M :
VFO SELECT:
Varies bias voltage to the receiver to monitor the transmitter signal.
Determines squelch threshold.
Varies rejection frequency.
Jack for headphones.
OFF: Mains voltage is off.
STBY: All voltage applied to receiver.
REC: Receiver operates.
CAL 100 KC: 100 Ke calibrator is on.
25 КС: 25 Ke multivibrator is on.
ON: Automatic noise limiter is connected.
OFF: Noise limiter is disconnected.
CW1/CW2: CW operation.
LSB/USB: SSB operation.
AM: AM operation.
I'M: FM operation.
Determines operating frequency.
Controls the gain of КГ and IF stages.
Controls the gain of audio amplifier, and AGC voltage is shorted at
pull position.
FAST: Fast release time constant.
SLOW : Slow release time constant.
Selects the coils and crystals for the desired band opetation.
Varies the crystal frequency slightly for receiver incremental tuning.
Tunes the RF circuits.
Select УНЕ convertor used.
NOR: Receiving frequency determined by the main tuning dial.
CH1-CH4: Crystal controlled operation.
OPERATIONS
SINGLE SIDEBAND RECEPTION.
For SSB operation, set controls as follows;
MONITOR/SQUELCH: Both controls fully counterclockwise.
REJECTION TUNING: OFF.
FUNCTION: REC.
ANL: OFF.
MODE: Desired sideband.
RF/AF GAIN: RF gain control fully clockwise and AF gain to the 12 o’clock position.
— 6 —
AGC: SLOW.
BAND: Desired frequency band.
CLARIFIER: 12 o’clock position.
PRESELECTOR : For maximum noise or signal output.
VFO SELECT: NOR.
Tune in signal with the main tuning knob and adjust AF GAIN for desired audio output level.
When listening to strong signals, RF GAIN control may be used to reduce set noise under no
sıgnal conditions.
Clarifier control may be used for a fine tuning of the main dial.
CW RECEPTION.
Set the controls as described in SSB reception, except a setting of the MODE switch to СУ
CW2. Center the desired signal in the receiver pass band, and then switch to the CW1 or CW2
mode depending on the location of interfering signals. Tune the upper side or lower side against
the desired signal, to reduce interference. The clarifier can be used as a pitch control of the audio
Output signal. For breakin CW operation, the AGC control should be set to OFF position and the
RF GAIN control decreased to prevent overload. Adjust the AF GAIN control to provide the
desired audio output.
AM RECEPTION.
Set the controls as described in SSB reception. Set the MODE switch to AM position and
AGC switch to FAST. High fidelity will be obtained with the MODE switch in the AM WIDE
position. Under crowded band conditions, switch to AM NARROW to climinate interference. The
CLARIFIER can be used to select one of the sidebands having least interference. Under heavy
noise conditions, ANL will be helpful in reducing the noise.
An interfering heterodyne or CW signal may be reduced in level or eliminated by the opera-
tion of the REJECTION TUNING control. At the OFF position, the tuning capacitor is shorted
to disable the circuit.
Clockwise rotation of this control from the OFF position moves the rejection notch across the
IF passband, When it is not needed, this control must be placed in the OFF position to avoid the
distortion of the receiving signal due to narrower passband.
When the receiver is initially placed in operation, it may be necessary to touch up the e adjust-
ment section of this hand book.
TRANSCEIVE OPERATION WITH FL SERIES TRANSMITTER.
Connect the cables as shown in the illustration following page.
Set VFO select switch on FL-transmitter to TRANSCEIVE position.
Set the BAND switches to the same desired band and both MODE switches to the same posi-
tion (either USB, LSB or CW).
Tune both receiver and transmitter as in normal operation. Both the transmit and receive
frequency is controlled with the receiver VFO.
Due to the frequency tolerance of the HF heterodyne crystals, it may be necessary to adjust
the CLARIFIER control to zero beat transmitting and receiving frequencies.
If the transmitted frequency is changed by any great amount, be sure to redip the PA plate
current and check the loading. Do not attempt operation in transceive service with any other
transmitter not having the same frequency mixing scheme as FL-transmitter.
For transceive service with FL-200-B transmitter in CW and USB modes, it is necessary to
change the sideband crystal of the transmitter, from 8546.5 Kc to 8543.5 Kc.
Dial lock lever under the MAIN tuning knob is to adjust dial touch and it tightens the touch
when rotated clockwise direction.
MAINTENANCE AND ALIGNMENT.
The FR-DX-400 receiver has been aligned and calibrated at the factory with proper test equip-
ments and will not require realignment for a long period of operation. Service or replacement of
a major components may require subsequent realignment, but do not attempt to make any adjust-
ment unless the operation of the receiver is fully understood.
CABINET REMOVAL.
Disconnect all power and external connections, and remove two screws under the cabinet and
six painted screws located at the front edge of the cabinet. From the rear, push the receiver
chassis forward and slide the chassis and panel assembly out of the cabinet.
IMPORTANT: DO NOT LUBRICATE THE VFO GEAR ASSEMBLY.
ALIGNMENT PROCEDURE.
The alignment of the receiver can be accomplished using a signal generator and VTVM.
However, complete alignment may be accomplished using the crystal calibrator as a signal generator
and the S-meter as a peak indicator.
455 KC IF ALIGNMENT.
a. Set MODE switch to USB, and center the calibrate signal at 14.2 MC in the IF passband.
If the calibrator signal is stronger than the S-meter reading of S4, use a higher band such as the
15 or 10 meter band.
b. Adjust the slugs of L114 and L115 for peak meter reading.
с. If a signal generator is used for this alignments, unsolder C124 from pin 1 of V103, connect
generator to pin 7 of V103, and adjust frequency to center of filter pass band. Align as described
above, disconnect signal generator, and replace C124.
T-NOTCH FILTER ALIGNMENT,
a. Check REJECTION TUNING knob position. It should be at the OFF position.
b. Tune the receiver to the calibrator signal on a band which provides a signal level of approxi-
mately S-9 plus 20 db in either USB or LSB position. Center signal in IF passband.
c. Set REJECTION TUNING knob to midscale (at 12 o’clock position).
d. Alternately adjust VR601 and L601 for maximum depth of notch as indicated by minimum S-
meter reading. If the circuit exhibits a tendency to ring or oscillate, back off slightly VR601.
TUNABLE IF ALIGNMENT.
a. Set VFO frequency to 200 kc and tune the receiver to calibrator signal on a band which pro-
vides a signal level of approximately S3 in either USB or LSB.
b. Adjust the slugs of L110 for peak S-meter reading.
с. If a signal generator is used for this alignment, disable the heterodyne oscillator by removing
the crystal for the band used. Connect the signal generator to pin 9 of V102, and set to 5,555 Kc,
Tune the receiver to the generator signal at approximately 200 on the dial, and align as described
above.
VFO DIAL CALIBRATION.
a. Set the BAND switch to any band and function switch to CAL 100KC, and tune the calibrate
signal to zero beat at 500, on the higher end of the dial.
b. Set the 50KC subdial to 0/50 position while holding the dial knob firmly.
— 9 —
c. Tune the dial to 0, lower end.
d. Adjust TC105 slightly to zero beat.
e. Tune the dial to 500 higher end, and adjust L113 slightly to zero beat to the calibrator signal.
f. Repeat this procedures until the VFO is calibrated at both end.
BFO ALIGNMENT.
Connect a RF probe of the VIVM between the secondary of L117 and ground, and adjust the
slug of L117 for maximum output. Back off slightly on the slug until the VTVM shows 70% of
the maximum reading.
HIGH FREQUENCY OSCILLATOR ALIGNMENT.
Connect a RF probe of the VIVM between the hot end of the secondary of L112 and ground.
Set the BAND switch to 10 D band, and adjust L112 for maximum VTVM reading. If the crystals
are not equipped for the 10D band, do not touch L112. Change the BAND switch to lower bands
and adjust the appropriate capacitors (TC103-TC104) for maximum VTVM reading.
RF CIRCUIT ALIGNMENT.
a. Tune to the calibrator signal at 1.7 Mc with the MODE switch in either USB or LSB
position. Connect a 47 ohm resistor or a dummy load to the antenna connector. Set the
PRESELECTOR to 1 position. ADJ р yer C/O ©
b. Tune to the calibrator signal at 3.5 Mc, and adjust slugs L103 and L107 for peak S-meter
reading.
c, Tune to the calibrator signal at 6.9 Mc, and adjust slugs L104 and L108 for peak S-meter
reading.
d. Tune the calibrator signal to 28.0 in 10A band, and adjust slugs L105 and L109 for peak
S-meter reading.
e. Set the PRESELECTOR to center and tune the calibrator signal at 14.2 Mc, and adjust TC101a
and TC-102a for peak S-meter reading.
f. Tune the calibrator signal at 21.2 Mc in 15 meter band, and adjust TC-101b, and TC-102b for
peak S-meter reading.
g. Disconnect the dummy load from the antenna connector, and connect a signal generator; set
signal generator to 5650 Kc with maximum output. Set the BAND switch to 40 meters, and
PRESELECTOR to 0 position. Adjust trap coil L10 for minimum S-meter reading. Disconnect the
signal generator. у
В. Connect an antenna to the antenna connector and tune to WWV and adjust TC-101C and
TC-102C for peak S-meter reading.
— 10 —
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S.METER ZERO ADJUSTMENT.
Set the receiver to the middle of any band, and peak the PRESELECTOR for maximum
output. Set RF-GAIN control to maximum, and short antenna terminal. Adjust S-meter ADJ
control Gn the rear apron of the chassis until the S-meter reads zero.
TROUBLE SHOOTING
Most cases of trouble can be traced to defective tubes. Substitution of new tubes will some-
times clear an obscure case. Intermittent trouble conditions in tubes can be usually be discovered
by lightly tapping the tube envelope. Occasionally, tube socket terminals will become dirty or
corroded causing intermittent condition. When this situation is suspected, remove the tube and
apply a few drops of contact cleaner to the socket pins, and work tube up and down in the socket
a few times. A logical process of elimination in conjuction with schematic diagram will aid in
isolating troubles.
Attached tables show typical voltage and resistance readings at each tube socket terminal, and
these arc the best aid in trouble shooting. Bear in mind that any of these values will vary slightly
due to line voltage and to normal tolerance in components and the measuring equipment used.
Following is typical cases of troubles and a trouble shooting guide.
TUBE AND DIAL LIGHT OUT: Blown fuse is probable case. Usually indicates short on the heater
| wiring, high voltage circuit, or silicon rectifier defective.
TUBES LIGHT BUT NO AUDIO: Check high voltage at filter condenser. If normal, check voltage
of pin 6 and 9 of V106. Check headphone jack and speaker
leads. Check diodes D-102 and 103. If OK this far, switch to
AM detector and SSB detector. If one is OK but not the other,
check the diodes in the detector circuit.
AUDIO OK BUT STILL NO OUTPUT; For troubles in the RF and IF stages, you can use S-
meter as well as audio to check troubles. Check on several positions of both band switch and
mode switch. If the set works normally on some mode but not others, the trouble is confined to
the filter assembly. If the set works normally on some bands but not on other, the troubles may
be in RF amplifier, Ist mixer or x-tal oscillator. If its behavior is the same on all mode and bands
it may be in either RF or Ш stages. Touch pin 1 of V104 with VTVM lead tip” Should produce
click from the speaker? Is this OK, troubles may be in RF stages. If this is not, troubles is in
IF stages. Check V104 and V105. Check VFO injection voltage at pin 1 of V103 with RF probe.
This is about 2 volts. Touch test lead to pin 1 of V103. Using this lead as an antenna, you
should hear noise. If not, check voltages of V103 and V107. If the noise does come up at this
point, the troubles are in RF stages.
If the troubles are nearer the front end of the receiver than Vi03, you should be hearing
some tube noise even if no signals. While listening to this noise, pull,out V102 from socket. If
this stage working normally, there should be a marked decrease in the noise. If there is not, check
voltages in this stages. A test lead attached to pin 9 of V102 should bring in some of the stronger
signal if the stage is working normally. In this case, troubles must be in RF amplifier stage.
This stage by stage technique should enable you to isolate the trouble in almost all case where
the receiver is dead. If the complaint is lack of sensitivity though the set is still operative, a
similar retracing from the audio stage back to front end should be used. Remember that troubles
confined to one of two bands must be in V101, V102 or V103.
If the S-meter fails to read correctly check AVC circuit.
STATION INTERCONNECTIONS
TRANSMITTER
FL-400
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RECEIVER
FR-400
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ACCESSORIES
FM DETECTOR UNIT
IOOKC/25KC MARKER
2 METER CONVERTOR
6 METER CONVERTOR
INSTALLATION OF OPTIONAL ACCESSORIES
Filters Installation ;
Space is provided in the receiver to install accessory filters; 600 cps filter is used in CW recep-
tion, 6ke filter is used for AM reception and 24 kc filter is used in FM reception. With the cabinet
lid open, the printing board for the filters assembly can easily be seen on the chassis. In the original,
MF455-10AZ (2.4 kc) and MFH40K (4 kc) are supplied. MF455-10AZ is used for CW, SSB, USB and
narrow AM reception in original wiring. To install optional filters, few wiring modifications are
necessary as illustrated in the figures. Be careful not to make mistake in installation of input and
output transformers. Refer to the figure.
Installation of MF455-03AZ (600 cps) Filter.
Install filter and matching transformers on printing board and solder all pins to the printing board
under the chassis. Cut short wire on mode switch and wire installed matching transformers to mode
switch as illustrated.
Installation of МЕ455 АОБОЕ (5 ke) Filter.
Remove original filter, matching transformer and shorting string on the printing board, and install
new filter and matching transformers. Solder all pins to the printing board under the chassis.
Installation of MF455A240F (24 kc) Filter. |
This filter is used for FM reception. Remove short wire on the printing board and install the
filter and matching transformers. Solder all pins to the printing board under the chassis.
Alignment ;
Tune the receiver to marker signal and adjust the slugs of input and output matching transformer
of appropriate filter for maximum S-meter reading.
— 14 —
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MODE SWITCH
(Г) Disconnect shorting wire here
(2) Wired to C601
600cps 5KC 24KC
(A) input transformer P278 Pink Pink
® output transformer G27 Blue Blue
Installation of FIX Oscillator Unit;
In original set, X-tal oscillator printing board for X-tal controlled operation is not supplied.
Wire the printing board and switches illustrated in the figures, then install the printing board on
the chassis with bracket supplied.
Alignment ;
Install crystals into the socket of printing board. Connect a RF probe to pin 5 of V107, and adjust
slug of coil on the,printing board for maximum VTVM reading. Trimmer capacitor on the printing
board is used to slightly shift the frequency of the X-tal used.
PANEL П > MD DC+9V from power supply
<- i} |} “rer À (2) DC+9V to VFO
|
va @) Coaxial cable from pin 1 of V107
| blue 2 (4) Coaxial cable from VFO
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IlPprint board
chassis #4
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Installation of FM Unit;
Remove the cover on the opening in the chassis, install FM unit with screw on the chassis and
wire as illustrated.
Alignment ;
Connect signal generator to pin 1 of V103 and set to 455 Кс. Set the mode switch to AM NARROW
mode and adjust signal generator output for S 9.
Connect VTVM RF probe to pin 6 of V501, and adjust lower slug of L501 for maximum VTVM
reading. Disconnect VTVM. Connect VTVM DC leads to the connection point of R506 47K and
R512 IM ohms. Adjust upper slug of L501 for VTVM reading zero. Disconnect VI VM.
<)
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) Shield wire (white) to S103C
green wire to S103D
White violete to VR501
Violet to R137
(MW) blue wire to heater supply |
@) Shield wire (green) audio out put to S103C
(3) brown wire to" B supply
@ Red wire to L—115
© Shield wire (red) to R136
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Installation of VHF Convertor Units;
Fix the coaxial connectors to the hole in the bracket with screws. Solder coaxial cable and wires
to the appropriate terminals in the printing board. Then install FC-6TR, FC-2TR convertors on
the bracket as shown on the pictures of the following page. Solder the ends of the wires which
have been soldered to the printing board to the coaxial connectors, variable capacitors and rotary
switch as illustrated.
Alignment ;
The units are so aligned with proper test equipment at factory that they do not require adjustment
after installation. TC-802 and TC-902 are neutralizing capacitors. L-803 and L-903 are coils for
local oscillators.
The units work in conjunction with 10 meter bands of the receiver, and 10 meter bands work as
tunable Ist IF amplifier. The relation between receiving range and 1st IF is shown on the follow-
ing table.
IF Me 28.0 28.5 29.0 29.5 30 Local X.tal
50.0 50.5 51.0 51.5 52.0 22 Mc
6 meter ne |
52.0 52.5 53.0 53.5 54.0 24 Me «ET 2%.
144.0 144.5 145.0 145.5 146.0 38.966 Mcx3
2 meter |
146.0 146.5 147.0 147.5 148.0 39.333 Mcx3
The units are aligned for above frequency corresponding to the local crystal frequency. When you
wish to change local crystal to cover another frequency range, trimmer capacitors and slugs should
be adjusted for peak S-meter reading against incoming signal except above-mentioned neutralizing
capacitors.
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