TM 11-6625-847-45
4-10. Common Module Army A1A2 If. Amplifier Module A1 Tests
a. Test Equipment and Materials.
(1) Voltmeter, Electronic AN/URM-145.
(2) Generator, Signal AN/GRM-50.
(3) Potentiometer, 10-kilohms, 2 watts.
(4) The test set 20-volt dc supply.
b. Test Connections and Conditions. Connect the test equipment as shown in figure 6-20 to if. amplifier module A1.
(To remove if. amplifier module A1 from tray A1A2, refer to paragraph 8-43 and figure 3-20. The fast points are shown
on figure 4-6.
c. Procedure.
Step
Control settings
No.
Test equipment
Equipment under test
Test procedure
a. None.
1
AN/URM-145
SM-442A/GRC
a. Connect a ground lead be-
VOLTS switch: .003
POWER switch: OFF
tween test set connector
Power switch: ON
Tray A1A2
J1, pin 70, and pin 70 of
AN/GRM-50
POWER switch: OFF
J1 on tray A1A2.,
RANGE switch:
SQUELCH switch: OFF
b. Connect a lead between pin
b. None.
530 kc to 1,801 kc
SQUELCH SYNC switch: OFF
41 of J1 on the test set and
FREQUENCY con-
AUDIO GAIN control: Fully
pin 41 of J1 on tray A1A4
trol: 1750.00
counterclockwise
Note. If test is made with
MODULATION SE-
AGC SYNC switch: OFF
A1A2A1 out of tray A1A2, con-
LECTOR: CW
RF AGC ON OFF switch: OFF
nect the ground lead to
POWER switch: ON
TEST SELECTOR switch: 1
A1A2A1E8, and the +20-volt
PP-1451/G
BFO TONE control: Fully coun-
dc lead to A1A2A1E11.
NORMAL CHARGE
terclockwise
c. TURN the test set POWER
c. None.
switch: NORMAL
RF GAIN control: Fully coun-
switch and the tray A1A2
Power switch: ON
terclockwise
power switch to ON.
ALC APC CONTROL ALC
d. Connect the AN/URM-145
d. None.
switch: OFF
probe to terminal A1E2,
ALC APC PPC CONTROL
and the probe clip to ter-
POWER control: Fully coun-
minal A1E3. Adjust the
terclockwise
AN/GRM-50 for an out-
ALC APC PPC CONTROL
put at 1.75 meat 1 0.1
APC/PPC SEL switch: OFF
mv rms.
VOICE MODES switch:
e. Remove the AN/URM-145
e. None.
PUSH TO TALK
probe loads from A1E2
TEST SELECTOR switch: 1
and A1E3, and connect the
Note. If A1A2A1 is tested
probe to terminal A1E14
separately from tray A1A2, the
and the probe clip lead to
above control settings need not
terminal A1E15.
be made on tray A1A2.
f. Adjust the 10-kilohm, 2-watt
p
f. Output
m tentiometer for maxi-
o
mately
um output on the AN/
URM-146.
g. Turn the POWER switches
OFF, and disconnect the
g. None.
equipment.
4-15
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