Yaesu FR-100-b Instruction Book

INSTRUCTION BOOK
FOR
FR-100-B COMMUNICATION RECEIVER
INSTRUCTION BOOK
FOR
FR-100-B COMMUNICATION RECEIVER
1. GENERAL :
The model FR-100-B communication receiver is designed for the amateur bands reception in the
frequency range of 3.5 Mc to 30 Mc with 3 extra bands which covers 600 Kc each. This
receiver provides top performance for the reception of CW, AM and SSB (upper & lower selectable).
FM reception is also possible with optional FM detector unit which makes this receilver a VHF
receiver with our crystal converter units.
Basically, it is a double conversion super-heterodyne receiver empolying a crystal controlled con-
verter for a first mixer stage; A highly stable variable oscillator is tuning the same range lineally on
all bands and a filter assembly consisting of two ‘‘MECHANICAL FILTERS”. A crystal filter is used
for CW reception.
Precise instrument type double gear driven dial together with adjustable scale on the main dial
provides easy and accurate frequency readings on all bands with approximately 1 Kc per division.
The receiver provides a wide variety of operations, such as band width, slow and fast AVC time
constants, SSB and CW reception with ring demodulator and built in frequency calibrator. And a
feature found only in this ham set- a “CLARIFIER”,
The FR-100-B communication reciever can be operated as a transceiver in conjunction with
FL-100-B SSB tramsmitter.
SPECIFICATIONS
Mode of operation Selectable SSB & CW with ring demodulator, AM with
diode detector.
Frequency range 3.5-4.1 Mc, 6.9-7.5 Mc, 13.9-14.5 Mc, 20.9- 21.5 Mc,
27.9-28.5 Mc, 28.5-29,1 Mc, 28.9 - 29.5 Mc, WWV and
band switch provides for addition of 3 bands cover 600
Kc each with optional crystal and circuit modification.
Crystal is not equipped for WWV and higher two bands
in 10 meters.
Spurious responce Image rejection more than 50 db; internal spurious sign-
als within ham bands less than that from a 1 u-volts
antenna input.
— | —
Frequency stability Less than 100 cps for 10% line fluctuation after warm up.
Selectivity For CW; 5 Ke at 6 db, 2.5 Ke at 60 db
AM; 4 Kc at 6 db, 7.5 Kc at 25 db
2,1 Kc at 6 db, 2.5 Kc at 60 db
SSB; 2.1 Kc at 6 db, 2.5 Kc at 60 db
Sensitivity Less than 0.5 micro-Volts for 10 db S/N ratio.
AVC Delayed AVC having discharge time constants of 0.1 sec.
for AM 2 sec. for SSB, and 0.5 sec, for CW,
Audio output 2 watts maximum.
Audio distortion Less than 5%,
Power requirement approx. 50 watts, 100/117/220/240, AC 50/60 cps.
Dial calibration 50 Ke main dial division, approximately 1 Kc
sub-dial reading.
Dimensions 7-1/8" high, 15" wide, 11-3/4" deep.
Net weight 12 Kgs (24 Ibs),
TUBE AND DIODE COMPLEMENT
6BZ6 1 RF amplifier 6BE6 1 lst mixer
6BA6 1 Crystal oscillator 6BE6 1 2nd mixer
6BA6 2 IF amplifier 6AQ5 1 Audio output
12AT7 1 VFO 15-1007 1 Harmonic diode
12AU7 i Audio amplifier 15-1007 4 Ring demodulator
6BM8 1 Voltage regulator 18-1007 1 AM detector
6BZ6 1 Calibrator SH-1 2 CW limiter
IS-1007 1 VFO shift SH-1 1 Isolation diode
SH-1 1 Noise limiter SH-1 1 Bias rectifier
SH-1 1 AVC rectifier
5-GL 2 Rectifier
2. CIRCUIT DESCRIPTION :
RF AMPLIFIER :
A 6BZ6 is used as a straight RF amplifier on all bands. This tube is a semi-remote cutoff
peutode having high gain, low intermodulation and excellent contro! characteristics. The autenna
terminal is connected to taps of antenna coils which are designed to match 50-75 ohms unbal-
anced input through a trap circuit which eliminates lst IF interference. The antenna coils and
the plate coils are tuned by a ganged variable capacitor. This variable capacitor is tuned from
the front panel and marked ‘‘PRESELECTOR”. The padding capacitor is so selected that the
preselector is electrically spread. For 80 meters only, the double section of the capacitor is used
to cover 600 Kc. The output of the RF plate coil is coupled to a grid of the 6BE6, the first mixer.
Sufficent gain is available in the RF amplifier section to assure high S/N ratio, AVC is applied
to the signal grid of tae 6BZ6, and screen grid supply is regulated for excellent AVC characteristics.
The cathode circuit of the 6BZ6 is connected to RF level control potentiometer that is located on
front panel.
— 9 —
HETERODYNE (1ST) MIXER:
А 6BE6 is used as the first high frequency mixer on all bands. The plate circuit of this tube is
tunable from 5,355 Kc to 5,955 Kc by a ganged capacitor with main VFO tuning capacitor and
provides excellent attenuation of spurious responses in the Ist IF range.
CRYSTAL OSCILLATOR :
A 6BA6 pentode tube is used in a crystal oscillator circuit. The frequency of the crystals are
listed on the table following. An overtone crystal is not used for the purpose of shifting crystal
frequency as a “CLARIFIER” by changing shunt capacity of the crystals. This is necessary to
“zero-in'”' receiver frequency to that of the transmitter for transceive operation. For 3 extra
bands, crystal sockets and plate tuning coils are furnished and the coils should be tuned to the
frequency required. The output of this oscillator is coupled to the grid circuit of the first mixer
tube through a trap coil.
VFO:
A 12AT7 is used as VFO oscillator and buffer tube. Oscillating frequency of VFO covers 600 Kc
from 4,900 Ke to 5,500 Kc lineally for all bands. Output from buffer tube is tuned to the center
frequency of the bands that is 4,200 Kc with low О tuned circuit and VFO output is connected to
the pin jack marked “VFO OUTPUT" on the rear apron of the chaseis for the transceive operation.
This output voltage is also supplied to the grid of 2nd mixer to produce 455 Kc IF signal.
2ND MIXER :
A 6ВЕб is used as the 2nd mixer which produces 455 Кс 2nd IF frequency, mixing VFO signal
and the lst IF signal. This 455 Kc IF signal on the plate circuit is then fed into the filter assembly
through the “МООЕ’’ switch.
FILTER ASSEMBLY :
The filter assembly consists of a 2.1 Ke mechanical filter, a 4 Ke mechanical filter and a crystal
filter. The mode switch selects the suitable filter for the receiving signal. For AM reception,
either 2.1 kc or 4 kc filter is used. For SSB reception, 2.1 kc mechanical filter is selected and the
crystal filter is only used for CW reception in conjunction with the 2.1 Kc mechanical filter. Crystal
filter phasing control is adjustable from front panel.
IF AMPLIFIER :
Two 6BA6 are used for the straight 455 Kc IF amplifier, tuned by three tuned coils. These two
tubes are controlled by AVC voltage and a manual RF GAIN control is placed in the first IF tube
cathode circuit in conjunction with the lst RF amplifier tube.
RING DEMODULATOR & BFO OSCILLATOR :
Four germanium diodes are used as a low distortion ring demodulator circuit for SSB and CW
reception. The crystal controlled BFO osciliator provides an extremely stable injection to mix with
455 Kc IF signal from preceding stage. The BFO crystals are selected by the ''MODE” switch.
For CW reception the LSB crystal is used. This type of reception greatly reduces both intermod-
ulation and harmonic distortion.
— 3 —
DIODE DETECTOR & NOISE LIMITER:
A germanium diode 1S-1007 is used in a conventional diode detector circuit for AM reception.
A silicon diode SH-1 is used as a conventional series noise limiter circuit which may provide
increased readability under heavy noise conditions. This limiter is placed in the circuit by the
ANL switch on the front panel for AM reception.
SIDETONE :
Muting voltage is adjusted from front panel to provide sidetone listening for CW transmission.
Muting voltage is reduced by advancing this sidetone control potentiometer and the receiver reco-
vers to listen the transmitted signal. This system can be used to check the audio quality of the
transmitting signal in LSB position.
AUDIO AMPLIFIER & OUTPUT:
12AU7 is used as a two stage audio amplifier with a gain control between the two triode sections
to cover the low output from the ring demodulator. 6AQ5 is used as power output tube, delivering
a full watt of audio to output transformer which provides a correct match to 4 ohms speaker and
600 ohms line at the output terminal on the rear apron of the chassis. The headphone jack on
the front panel is circuited in the grid of this tube and avoides speaker output for private listening.
Negative feedback in the circuit helps lower distortion.
AVC:
A delayed AVC circuit is employed with a silicon diode SH-1 as an AVC rectifier. AVC discharge
time constants are chosen by the ''MODE” switch on front panel. Fast AVC is used for AM
reception; discharge time is 0.1 u $ес., For SSB reception, discharge time is selceted to 2 sec.,
Muting is accomplished by inserting a cutoff bias voltage into AVC line. An isolating diode, SH-1
is used to isolate the discharge capacitor from mute circuit to assure quick recovery of the rece-
iver. This permits almost instantaneous muting and recovery of the receiver.
POWER SUPPLY :
The full-wave rectifier circuit uses two silicon diodes, 5-GL. Condenser input is adopted with 5-H
choke coil providing quite adequate filtering. Under load, the power supply delivers B-plus voltage
of 180 volts. Regulated supply is used for all oscillator and screen grid circuits of the AVC
controlled tubes. For stabilizer, 6BM8 tube is used for better regulation than a gas diode. Power
transformer is designed for 100/110/200/220 volts operation. A silicon diode, SH-1 is used for
muting voltage -100 volts.
3. INSTALLATION AND OPERATION :
The FR-100-B receiver is designed for 100/110 or 220 volts 50/60 cps AC only and cosumes
approximately 50 watts.
— A —
AUDIO OUTPUT :
A permanent magnet type 4 ohms speaker should be connected to the terminals marked ''4’’ and
“G'” on the rear apron of the chassis. Our model SP-100 matched speaker is available from your
dealer and is a perfect combination for the receiver and FL-100-B transmitter.
ANTENNA:
The antenna input impedance of the FR-100-B receiver is designed for 50 to 70 ohms. Coaxial
terminal is provided on the rear of the chassis. It is recommended that when the FR-100-B is
used with a transmitter, a transmitting antenna be used, change-over being accomplished by an
antenna relay which is already installed in our FL-100-B transmitter.
MUTING :
While a normal stand-by switch is provided on the front panel as function switch, much smoother
station operation can be accomplished by the use of an external muting control in conjunction with
transmitter, To use this feature, only a relay contact which closes in receiving and open in
transmitting period is required. FL-100-B transmitter provides this relay contact in accessory
socket on rear apron for smooth VOX and CW break-in operation.
CONTORLS :
PRESELECTOR :
The dial in the upper right corner marked ''PRESELECTOR” tunes a ganged capacitor in the grid
and plate circuits of the RF stage of the receiver. Careful peaking of this control on all bands is
necessary, though the tuning will not be much sharper than a conventional receivers. The ham
bands are centered on the tuning dial and O to 10 division is provided for the tuning of any extra
bands that may be added.
BAND :
On the right side is the band switch. Ham bands are marked from 80 to 10 meters. Ten
meter bands are divided into 3 bands 10A, 10B and 10C. Note that the crystal is only furnished
on 10A as original equipment in the receiver. The other 10 meters, WWV and 3 extra bands
require the addition of auxiliary crystals.
FUNCTION :
This controls power to the receiver, send-and-receive and calibrator on-off. In the OFF, the
receiver is completely turned off. In the ST-BY, all powers are turned on, and the receiver works
by the connecting the mute terminal to the ground. In the REC, the receiver works independently.
In the CALIB, the cathode circuit of the calibrator tube is connected to the ground and antenna
input is disconnected from antenna coil,
MODE :
In the CW, this control turns on BFO for LSB, and crystal filter and 2.1 Kc mechanical filter is
placed in the circuit. In USB and LSB, the crystal filter is removed from the circuit and approp-
riate BFO crystal is operated for SSB reception with a ring demodulator circuit. In the AM, BFO
oscillator circuit is disconnected and AVC time constants are changed to shorter time constants.
Either 2.1 Kc or 4 Кс, mechanical filter can be used for AM reception. In the FM, all filters are
removed from the circuit, and optional FM limiter & detector units is supplied to install on the
cutout of the chassis.
RF GAIN:
This control is connected in the cathode circuit of the RF and lst IF stage and is used to control
the receiver gain in all classes of the operation.
AF GAIN:
The audio gain control is used to control the audio amplification of the receiver.
SIDETON :
The SIDETONE control is used to adjust a muting voltage for the receiver. Rotation toward
clockwise direction will reduce muting voltage and the receiver starts to operate to hear transmitting
Signal. If this is not wanted, the control should be placed in the fully countercockwise position.
PHASING :
The phasing contro! is used to assist in rejecting interferring heterodyne in CW reception.
ANL :
In the On, this conrol turns the automatic noise limiter which is only placed in the circuit for
AM reception.
CLARIFIER :
This control is used to shift the receiving frequency sligntly by varying the shunt capacity of the
heterodyne crystals. For SSB reception, ''ZERO-1N” is very easy with this control, which is also
used to compensate the tolerance of heterodyne crystals of receiver and transmitter for the perfect
transceive operation. For CW reception, this can be used as pitch control.
OPERATION :
it will be assumed all connections are in place as illustrated. An outline of recommended
control settiing will be described here and more detailed operation will be understood with the
expalnation of the function of each control described in the preceding pages.
— 6 —
A. AM RECEPTION :
Set the controls as follows ;
FUNCTION REC.
MODE AM 4 KC.
ANL OFF
BAND Desired band.
RF GAIN Fully clockwise
PRESELECTOR Center
AF GAIN Desired audio volume
SIDETONE Fully counterclockwise
CLARIFIER Center
Tune in signal with main tuning dial and then peak the “PRESELECTOR” for maximum S-meter
reading. For AM, the 4 Kc, mechanical filter is adequate for normal use, however, under crowded
band conditions the narrower 2.1 Kc filter may be more desirable. Tuning is more critical using the
2.1 Kc filter. Tune for pleasing voice quality. This will not correspond with maximum S-meter
reading. Clarifier can be used as a fine tuning adjustment to select the sideband having less
interference. Under heavy noise conditions, ANL can be used to reduce noise interference.
В. CW RECEPTION :
Set the controls as follows ;
FUNCTION REC
MODE CW
ANL OFF
BAND Desired band
RF GAIN Fully clockwise
PRESELECTOR Center
AF GAIN Desired audio gain
SIDETONE Point at which sidetone signal is heard.
CLARIFIER Center
PHASING Center
Tune in signal with main tuning dial and then carefully peak '"PRESELECTOR”. Phasing control
can be adjusted for minimum interference and maximum signal strength for desired siganl. The
clarifier can be used as pitch control for audio beat tone.
C. SSB RECEPTION:
Set the controls as follows:
FUNCTION REC
MODE Desired sideband.
ANL OFF
BAND Desired band
RF GAIN fully clockwise
PRESELECTOR Center
AF GAIN desired audio volume
SIDETONE Fully counterclockwise
CLARIFIER Center
PHASING Center
Tune in signal carefully for natural voice quality and peak the 'PRESELECTOR' and adjust AF
gain control to wanted level. Clarifier can be used as a fine tuning adjustment. This device
permites ‘'Zero-In’ with a minimum of efforts. For very strong signal, RF CAIN control should
be reduced to avoide distortion.
— fo ==
D. TRANSCEIVE OPERATION:
Perfect transceive operation can be accomplished by utilizing our FL-100-B transmitter. For this
operation, connect FR-100-B and FL-100-B as illustrated in figures following. VFO cable (Coaxial
only) should be short as possible to avoid excessive loss of injection voltage to the transmitter.
Turn VFO switch to transceive. For the older sets, this switch is located on the VFO box inside
of the cabinet and in this case, you can change the transmitter cabinet with receiver cabinet which
has a cutout for the switch operation on top. Carefully check your transmitter before buyiag a
receiver.
INITIAL ALIGNMENT FOR TRANSCEIVE ORERATON :
Connect both sets as illustrated and connect transmitter to a dummy load.
Set the controls as follows ;
FL-100-B TRANSMITTER :
OPERTAION SW. STBY
BAND | 80meters.
MIC GAIN OFF
MODE LSB
VOX SENS. OFF
VOX DELAY Fully counterclockwise.
ANTITRIP #
VFO SW. Transceive,
LOADING Fully counterclockwise.
PLATE 80 meter area.
CLARIFIER OFF
FR-100-B RECEIVER
FUNCTION REC.
MODE LSB
ANL OFF
BAND 80 meters.
RF GAIN Fully clockwise.
PRESELECTOR Center
AF GAIN Desired audio volume.
SIDETONE Fully counterclockwise,
CLARIFIER Center.
PHASING Center.
Turn on power for both sets and wait for warm up. Tune the receiver main tuning dial to 3,800
Kc. Throw the operation switch to ''OPER”. Tune the transmitter to this frequency with carrier
inserted. Adjust a slug on rear apron on the receiver chassis for maximum transmitter output.
This slug is located close to VFO OUTOUT jack of the receiver and initially adjusted in factory to
maximum output without cable connection. When VFO cable is connected, it is necessary to adjust
for maximum VEO output, and it is also necessary when cable is removed from the jack to readjust
this slug for maximum VFO output at jack. These adjustment should be done at the center of VFO
— 8 —
scale. Now the receiver VFO controls transmitting frequency. For the transceive operation,
the clarifier only shift receiving frequency to set a receiver exactly on transmitting frequency.
For transmitters bearing series No. smaller than 6502100, minor transmitter circuit modifications
may be required for a perfect transceive operation. Main modification is to add 20 meter crystal
for heterodyne mixer circuit as illustrated. For the parts required and modification instruction,
your dealer will give you full informations.
LSB TRANSCEIVE OPERATION :
Make sure that all connections are in place for transceive operation, Tune in signal and spot
transmitter frequency in SPOT position with CLARIFIER to zero beat. Do not touch CLARIFIER
knob any more and tune in signal with main tuning knob.
USB TRANSCEIVE OPERATION :
Tune in signal in USB position, and set a operation switch of FL-100-B to SPOT position. Cha-
nge the MODE switch of the receiver to LSB, and tune the CLARIFIER for zero beat with spot
signal form the transmitter. Change receiver mode switch to USB, you are ready for USB tran-
sceive operation. With this method, you can operate in 50 cps tolerance, however you may adjust
as follows for very accurate frequency setting of perfect transceive operation :
Tune in signal and switch to transmitter VFO and spot this VFO frequency to zero beat with
incomming signal. Switch to LSB reception, and tune main receiver dial zero beat with transmitter
VFO signal. Switch to USB and tune a CLARIFIER into zero beat. Switch transceive switch to
TRANSCEIVE position. You are now exactly on incomming signal.
4. MAINTENANCE :
The FR-100-B receiver has been aligned and calibrated at the factory with proper test equipments
and will not require realignment for long period of operation. Service or replacement of a major
component may require subsequent realignment, but do not attempt to make any adjustment unless
operation of this receiver is fully understood.
CHASSIS REMOVAL FROM THE CABINET:
Remove the four screws on the side of the cabinet and a screw on the bottom of the cabinet
and carefully slide the chassis and panel assembly out from the front of the cabinet.
TEST EQUIPMENT REQUIRED:
Recommended service equipments for allgnment are;
A. Vacume tube Volt-Ohm-Meter with a RF probe.
B. Signal generator covering 455 Ke to 30 Mc.
TUBE REPLACEMENT :
Most trouble encountered in radio equipments is due to tube failure rather than component
failure. The FR-100-B has been designed so that its tubes may be replaced without need for
realignment. The best check on tubes is direct substitution in the receiving set rather than relia-
nce check on a tube checker. All tubes are clearly identified on the VFO case and care should
be taken to put the tubes in the correct socket,
— 9 —
VOLTAGE AND RESISTANCE MEASUREMENT :
Refer to the table of resistance and voltage measurements to determine the circuit in which the
trouble is located, Regulated supply should be set at 100 volts by a potentiometer located close
to 6BM8 tube.
BFO ALIGNMENT :
Connect a RF probe of VTVM to either pin of output terminal of L23. Set mode switch to USB
and adjust bottom slug for maximum output, then top slug for maximum output, VTVM reading
is approximately 0.5 volts,
455 KC IF ALIGNMENT :
To align the 455 Ke IF amplifier stage, set function switch to “CALIB’’ and use 100 Kc marker
as signal source. Tune it with the receiver and peak both slugs of L21 and L22 for maximum
S-meter reading or maximum negative voltage measured with a VTVM at the AVC line.
FILTER ASSEMBLY ALIGNMENT :
Set the controls as follows:
Function switch to “'CALIB”.
Mode switch to "CW"!
Band switch to ''80”
Phasing to center
Tune in marker signal for maximum S-meter reading. Adjust TI for maximum S-meter reading.
Change mode switch to ''AM 2KC” and peak T2 and ТЗ for maximum S-meter reading, then “АМ
AKC'' for maximum S-meter reading with top slug adjustment of 4 Kc mechanical filter.
VFO ALIGNMENT :
Tune in 100 Ke marker signal at 80 meter band. Tune in 4.0 Mc, and set sub-dial to O holding
knob tightly. Adjust L20 for zero beat. precise adjustment is required for adjustment of these
coils and capacitors. Set main tuning dial to exactly 3.5 Mc and adjust TC6 for zero beat. One
or two degree of rotation may be enough for TC6 adjustment. Repeat this procedure until dial
is accurately calibrated.
VFO SHIFT ADJUSTMENT :
Tune in 3.8 Mc on 80 meter band in LSB mode for zero beat. Turn mode switch to USB,
and adjust TC7 for zero beat. Repeat this Procedure until zero beat is obtained in both sideband.
1 ST (VARIABLE) IF ALIGNMENT :
Set mode switch to AM 4 Kc. Tune in 3.5 Mc marker signal. Adjust TC3 and TC4 for
maximum S-meter reading. Tune in 4.0 Mc, and adjust L8 & L9 for maximum S-meter reading.
Repeat this procedures several times for perfect tracking.
CRYSTAL OSCILLATOR ALIGNMENT :
Connect a RF probe of VTVM to pin 1 of V2, 6BE6. Place band switch on 80 meters. Adjust
Lil for maximum VTVM reading. Successively change band switch to 40, 20, 15, 10 meter
bands, and adjust L12, L13 etc. for maximum VTVM reading. In the case that crystals are equip-
ped for the other bands, repeat this procedure for each band. For this alignment, the clarifier
should be set at a center position.
RF ALIGNMENT :
Set the mode switoh AM 4 Kc and RF-gain fully clockwise. Connect signal generator to antenna
connector and set a frequency to 3.5 Mc. Set "PRESELECTOR” to fully counterclockwise and
advance one scale. Tune in 3.5 Mc sigan! generator signal with main dial. Adjust L2 and L5
for maximum S-meter reading. Turn band switch to 40 meter and set signal generator to 7.2
Mc, and tune in with Main dial. Set the ''PRESELECTOR” to center. Adjust TCla and TC2a for
maximum S-meter reading. Turn band switch to WWV and set signal generator to 10,200 Kc.
Tune in this signal and adjust L3 and L6 for maximum S-meter reading. If WWV crystal is not
equipped, omit this procedure. Turn band switch to 20 meter, and signal generator to 14,200
Кс. Tune in this signal and adjust TC1b and TC2b for maximum S-meter reading. Turn band
switch to 10A, and signal generator to 28,500 Kc, and tune in this signal and adjust L4 and 17 for
maximum S-meter reading. Turn band switch to 15 meter, set signal generator to 21,200 Kc,
and tune in this signal. Adjust TCle and TC2c for maximum S-meter reading. Turn band
switch to 40 meter and set signal generator to 5,650 Ke and adjust a trap coil which is installed
in input circuit for minimum S-meter reading with maximum signal generator output.
S-METER ALIGNMENT :
Set signal generator to 14,200 Kc 50 uV output, and tune in this signal. Set S-Meter adjust
potentiometer on rear apron of chassis to S9,
TROUBLE SHOOTING:
Charts showing both resistance and voltage measurement are following. This is a best aid in any
trouble shooting. Bear in mind that any of these value will vary slightly due to line voltage and
normal tolerance differences in components and measuring equipments.
TUBE AND DIAL LIGHT OUT; Blown fuse is probable case. Usually indicates short on the
heater string or B circuit or silicon rectifier damage.
TUBE LIGHT BUT NO AUDIO; Check B at filter condenser. If normal, check pin 6 and 1 of
V9 and pin 5 of V10. Check headphone jack and leads to speaker. If OK this far, switch
dctector and ring demodulator. If the output from one is OK but not the other, check diodes.
AUDIO OK BUT STILL NO OUTPUT; For troubles in the RF and IF stages, you can use S-meter
as well as the audio to check troubles. Check on several positions of both band switch and mode
switch. If the set works normally on some mode but no others, the troubles 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 IF stages. Touch pin 1 of V7 with VTVM lead tip. Should produce
click from the speaker ? If this is OK, troubles may be in RF stages. If this is not, troubles is
in IF stages. Check V7 and V8. Check VFO injection voltage at pin 1 of V3 with RF probe.
— |] —
This is about 2 volts, Touch test lead to pin 1 of V3. Using this lead as an antenna, you
should hear noise. If not, check voltages of V3 and V6. 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 V3, you should be hearing some
tube noise even if no signals. While listening to this noise, pull out V2 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 7 of V2 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 cases 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 V1, V2 or V3.
If the S-meter faills to read correctly, check AVC circuit.
5. ACCESSORY BANDS:
Band switching in this receiver dose not affect any of the circuit following the lst mixer, the
problem of extended coverage has been greatly simplyfied. Such additional coverage may be
desired for covering MARS frequencics, the citizens band and broadcact of other applications.
The general fromula for calculating the crystal frequency required to cover a given band of frequ-
encies is as follows;
XTAL = Lowest desired frequency + 5,955 Ke,
For example; find crystal frequency for band coverage of 8 to 8.6 Mc.
Crystal frequency is 8,000 + 5,955 = 13,955 Kc.
In this example, VFO dial is 100 Kc higher. To read receiving frequency direct from the dial,
it is desired to select lowest frequency at 900 Kc. That is like 7,900 Ke or 10,900 Ke, Oscillator
plate coil should be tuned to crystal frequency given from above formular. Overtone crystal is not
recommended. See crystal table following.
To use extra bands, it is necessary to counect bands switch to appropriate coils as shown
in figures,
The use of frequency range between 4,000 Ke and 7,000 Kc is not recommended.
The following table shows crystal frequencies required to obtain coverage of any band between 7
Mc and 30 Mc. Coil and shunt capacitor are also shown.
RESISTANCE MEASUREMENT FOR FR-100-B
TUBE
12
5OK
БОК
600K
18K
100
17K
PIN NUMBER
4 5 6
0 18K
О
0 15K 38K
0 260K 180K
0 18K 28K
0 0
|
О | 17K
О 17К
0 0
0
О 0
O 0
2,2K
О
Value are measured by УТУМ.
ALL RESISTORS VALUES ARE IN OHMS (K=1,000 M=1,000K)
VOLTAGE MEASUREMENT FOR FR-100-B
. 3
V 1 61 09-69 4H
2 G1 2.2 H
3 G1 2.2 H
4 61 0.4 H
5 G1 E H
6 215 G 3,2
7 61 |15-13| H
8 G1 1,5 H
9 85 ét 3.5
10 G1 13 H
11 +o" USE Gi 2/USB
12 50 100 75
PIN NUMBER
4 5 6
E 215V 100V
E 215 75
E 215 70
E 50 18
E 94 82
E E 87
E 213 100
E 213 | 100
E E 60
E 212 215
E E” LSB
E H 215
E
2K
2,1
VALUE ARE MEASURED BY VTVM.
CONNECTION OF FL-100-B TRANSMITTER & FR-100-B
RECEIVER FOR TRANSCEIVE OPERATION
FL-/G08
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ER-1008
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63V(1A) Led Y y > 70 SPEAKER
OC ZZ20V (2OmA)
EARTH ГО SPEAKER AG
BLOCK DIAGRAM FOR FR-100-B RECEIVER
5.955 ~
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XTAL CALIB ? IST LOCAL as Suet PEUT | ngC-RECT
№ 6B26| | V5 6BAG АТТА | V6 IZATIZ 15/1007 S-METER
| HS BST |
| | art ver ANT
151007| | sH-] E
AF-1 АЕ-2 POWER АМ 60052.
т / |
55827 cw it VEJZEATIAG| [VE LZATZS | Wo 6405 2
SIDO FXF .
KRISE N +B
BFO
В/А5 | | STAB siicow| [power PHONE
VINEATT SH-] V2 6808 5 ХР TRANS
FILTER ASSEMBLY
(7-1)
/
MECHANICAL FILTER
МЕ-455-—10
т
O
MF ЧАС
VFO BOX & IF STAGE
un
=3
MODE SW (S-ze)
(WHITE À VIOLET)
ar = L20
V3
& E
O
TC-6
O
AC 63V FB DEZEOV DC /90V(STA8)
(BLUE) (BROWN) (ORANGE)
| Pi
| =L9----- L8 + A - ws
#
BAND COVERAGE X-TAL REQUIRED RF COILS SHUNT CAP.
IN MC, IN MC, IN PF.
RF OSC.
75-81 13.455 L3 & L6 110 plus trimmer 50
7.9 - 8.5 13.855 7 100 7 р
8.5 - 9.1 14.455 7 80 7 7
8.9 - 9.5 14.855 er 70 7 Wt
9.5 - 10.1 15.455 и 60 # 40
9,9 - 10.5 15.855 uw 50 и #
10.5 - 11.1 16.455 " 40 Y ”
10.9 - 11.5 16.855 7 30 7 и’
11.5 12.1 17.455 u 20 7 ”
11.9 - 12.5 17.855 и 20 0 20
12.5 - 13.1 18,455 # 15 и #
12.9 13.5 18.855 “we 10 a fr
13.5 - 14.1 19.455 7 0 7
13.9 14,5 19.855 ## и! и!
14.5 - 15.1 20.455 7 7 и
14.9 - 15.5 20.855 14 & 17 60 ” er
15.5 16.1 21,455 ff 50 ## af
15.9 16.5 21.855 dd 30 q sf
16.5 17.1 22,455 и! ## 7 10
16.9 - 17.5 22.855 7 20 7 р
17.5 18.1 23.455 ff a и! af
17.9 - 18.5 23.855 nt 10 1 +
18.5 - 19.1 24.455 м ” 7 и
18.9 - 19.5 24.855 м # u e
19.5 - 20.1 25,455 7 ” „
19.9 20.5 25.855 i ИР
20.5 - 21.1 26.455 и и 5
20.9 - 21.5 26.855 и ” и
21.5 - 22.1 27.455 и 15 7
21.9 - 22,5 27.855 и # Y
22.5 - 23.1 28.455 "1 м и
22.9 - 23.5 28.855 # 10 "
23.5 - 24.1 29,455 u # и’
23.9 - 24.5 29.855 и 7 #
24,5 - 25.1 30.455 7 5 vr
24.9 - 25.5 30.855 7 Pr vr
25.5 - 26.1 31.455 + р
25.9 - 26.5 31.855 7 Pr
26.5 - 27.1 32,455 7
26.9 - 27.5 32.855 и
27.5 - 28.1 33.455 #
27.9 - 28.5 33.855 и
28.5 - 29.1 34.455 и remove 3T from
28.9 - 29.5 34.855 # oscillator coil.
29.5 - 30.1 35.455 и „
As described, overtone crystal is not recommended.
For the crystals higher than 15 Mc.,
fundamental crystal frequency should be 1/2 or 1/3 of above listed value. Bands betwzen 4,100
and 6,900 Kc are not recommended to use.
scale of dial: group starting from 900 Kc to black scale.
The group starting from 500 Kc corresponds to red
EXTRA BANDS MODIFICATION
Connect the coils given from freque-
ncy chart to Sla, Sic, and $14.
Connect the capacitor given from the
chart between Slb Sle and ground.
Connect coils to Slg, and capacitor
given from the chart between term-
inals of coil.
ALIGNMENT
Set the “PRESELECTOR” to tne
center, and adjust a trimmer for
maximum S-meter reading.
Adjust a slug of a appropriate coil
for 1.5V injection to mixer grid 1.
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BAND SW (S-/a-3)
V26BM8
Vi06AQ5 У? 6BA6
2KC MF La
Vo 12AU7 Vs 6BA6
Р.Т.
L 22
VR4
Las
Vıl2AT7
X13
X14
V4 6BZ6
X1 100KC
X-FILTER
PL
4KC MF
L2
Vi 6BZ6
VFO 2
Xe La
wi N |
PRESELECTOR
Ув 12AT7
L5
Vs 6ВАб
Va 6BE6 V2 6BE6
BAND SW. Le
Vs 6BA6 TC-2
V2 6BE6
CLARIFIER
TO SHIFT RE "
MODE SW.
FUNCTION SW.
\ Cas
Cal
VRa : | u \
f ITPUT ] 1
Vi26BM8 / WOE Ve -12407
NL-65
Vw6AQ5
(104)
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=
629.307
CET 2P ИР 6ВХб
[PRESELECTOR)
338535
| 26.9535
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3-34
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EUNETION
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(OOK
SIDE TONE
À
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PL
C100 BR = 5 X/ AC
105, = Сиб, C/OF C/08 NOTES
A A A ALL RESISTOR
< 4 4 ALL AESISTOR
A= QOluf
V3 6BEE
MODE (CW)
La FILE | LIE
di! р, ik д
DTS TOS E
Fase + 4
Æ 350 4
SIDE TONE
li ee = ae DO;
3 X/ AC 700, NO 11T, 200 220 2347, INPUT =
6/07 СВ = NOTES
A A ALL FESISTORS VALLES ARE IN OHMS (K=/000 9=/000K)
4 ALL AESISTORS ARE 22 WATT UNLESS OTHERWISE SHOWA
A=O00lMF FzurF
FR-100B |
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