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 TM 11-6625-2609-34
Control settings
Step
Test procedure
Equipment under test
Test equiptment
Performance standard
No.
b. Set the maintenance b. None,
kit POWER CB cir-
cuit breaker to ON,
VHF COMM OFF-
PWR
switch to
PWR, VHF COMM
frequency-selector
switches to 132.500
MHz, and allow a
few minutes warmup
period before pro-
ceeding.
c. Set maintenance kit c. A power output indica-
PTT switch to ON.
tion should be ob-
tained on the AN/
Set PTT switch to
OFF.
URM-120.
d. The INPUT CUR-
RENT meter should
indicate 6 to 9 amp.
(6) Dummy Load, Electrical DA-75/U.
3 - 1 2 . Sidetone Circuit Check
a. Test Equipment and Material.
b. Test Connections and Conditions. Connect the
equipment as shown in figure 36. The AN/URM
(1) Radio Set AN/ARC-134.
127 is not used for this test. Place the C-1611D/
(2) Power supply.
AIC transmit-interphone selector switch in posi-
tion PVT, the RECEIVERS 3 switch ON, all other
120A.
RECEIVERS switches off, and position the VOL
(4) Headset-Microphone H-157/AIC.
c o n t r o l as required. T h e s e settings must be
maintained during the test.
(5) Adapter.
c. Procedure.
Control settings
Step
No.
Performance standard
Test equipment
Ted procedure
Equipment under test
1
a. None.
AN/ARC-134
a. Apply primary oper-
Set all test panel switches
to OFF, set EXT.
Set meter switch to
ating power to test
equipment and main-
LINE V.
SQUELCH CONTROL
tenance kit.
AN/URM-120
fully counterclockwise,
b. None.
and set AUDIO switch
b. Set the maintenance
Set above 25.
kit POWER CB cir-
to ON.
cuit breaker to ON,
VHF COMM OFF-
PWR, switch to
PWR, VHF COMM
frequency-selector
switches to 132.500
MHz, and allow a
few minutes warmup
period before pro-
ceeding.
c. The AN/ARC-134
c. Key the AN/ARC134
sidetone should be
with the switch on
heard in headset.
the U-94A/U and
speak into micro-
phone. Release
switch.
The meter on the AN/
Key AN/ARC-134 with
AN/ARC-134
Leave controls in positions
2
ARC-134 and the IN-
last indicated in step 1,
switch on the U94A/U
Set meter switch to
PUT CURRENT meter
and speak into micro-
except set C-1611D/
MOD I.
on the test panel
phone.
AIC transmit--inter-
AN/URM-120
should fluctuate with
phone selector switch to
Leave controls in posi-
modulation.
position 3.
tion last indicated in
step L
3-15
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