TM 11-5826-225-35
the corresponding transformers (figs. 2-12 or
cation is achieved by maintaining
2-12.1 and 2-13 or 2-13.1). Always repeak
approximately 20-mw output on the
the capacitors if the corresponding transfor-
audio output meter.
mers require adjustment. Disconnect the head-
k. Adjust C16 (fig. 2-12 or 2-12.1), C23,
set from the test set when observing the audio
and C26 (fig. 2-13 or 2-13.1), in that order,
output meter.
for maximum indication on the audio output
meter.
Coil l tjlubrwlt
Capacitor adjustment
Capacitor frequency setting
Coil
frequency setting
l. Check that the screwdriver slots in C16,
C23, and C26 are not parallel to the front-to-
420
T105
C17
800
rear axis of the receiver. If any of the screw-
T108
420
C24
800
420
T11
driver slots lie parallel to this plane, the corres-
C27
800
1700
T106
900
C18
ponding transformer for that capacitor (T104
C25
1700
T109
900
for C16, T107 for C23, and T10 for C26) must
C28
1700
T12
900
be adjusted. If T104 (fig. 212 or 2-12.1),
T107, or T10 (fig. 213 or 2-18.1) must be
adjusted, proceed as follows:
3-15. RF Balance Adjustment
(1) Reconnect the headset to the test set.
a. Connect the equipment as shown in figure
3-3. The schematic of the test jig is shown in
(2) Set the BFO-OFF switch on the con-
trol unit to BFO.
(3) Adjust the TUNE control on the con-
b. Set the switches on the control unit as
trol unit for 200 kc.
follows :
(4) Set the signal generator to 200 kc
(1) BFO-OFF switch to OFF.
as determined by a zero beat in the
(2) Function switch to ANT.
headset.
c. Set the switches on the test set as follows :
(5) Set the BFO-OFF switch on the con-
trol unit to OFF.
(1) DC POWER switch to ON.
(6) Disconnect the headset.
( 2 ) RECEIVER-CONTROL switch to
RECEIVER.
(7) Unsolder and remove the cover of
the transformer to be adjusted (T104,
(3) GONIO DRIVE switch to ON.
T107, or T10).
d. Set the range switch on the control unit
(8) Adjust the output of the signal gen-
to 190-400, and adjust the TUNE control on
erator for 2 mw on the audio' output
the control unit for 400 kHz on the FREQUENCY
meter.
indicator.
(9) Adjust the transformer T107 above
e. Adjust the output of signal generator A
for maximum output on the audio
to zero.
output meter.
f. Set the frequency of signal generator B
(l0) Replace and resolder the cover of
to 400 kc and the output to 100 microvolt,
the transformer.
modulated 30 percent with 400 cps. Adjust
(11) Repeak capacitors C16, C23, and C26
the frequency of the signal generator for maxi-
at 390 kc (d through k and (1)
mum indication on the audio output meter.
through ( (10) above).
g. Adjust the GAIN control on the control
m. Repeat the procedures in d through l
unit for 20 mw on the audio output meter.
above for the capacitors (figs. 2-12 or 212.1,
and fig. 213 or 213.1) and frequency settings
h. Set the frequency of signal generator A
listed in the chart below. If necessary, adjust
to 560 kc.
3-24 Change 5
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