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Page Title:
Modulation Check, DATA LINK INPUT Circuit |
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 TM 11-6625-2609-34
Control settings
Step
Performance standard
Test procedure
No.
Equipment under ted
Test equipment
AN/URM-127
b. Set the maintenance b. None.
Set frequency to 1000
kit POWER CB cir-
Hz.
cuit breaker to ON,
VHF COMM OFF-
PWR switch to
PWR, the VHF
COMM frequency-
selector switches to
132.500 MHz, and al-
low a few minutes
warmup period be-
fore proceeding.
c. Set maintenance kit c. A modulation indica-
tion should he ob-
PTT switch to ON
tained on the AN/
and increase AN/
ARC-134 meter.
URM-127 output
level.
d. Set PTT switch to
OFF.
(7) Dummy Load, Electrical DA-75/U.
3-15. Modulation Check, DATA LINK INPUT
Circuit
b. Test Connections and Condition. Connect
the equipment as shown in figure 3-6. Connect
a. Test Equipment and Material
AN/URM127 through the 50-f capacitor to test
(1) Radio Set AN/ARC-134.
p a n e l DATA LINK INPUT jacks (capacitor to
(2) Power supply,
HI jack). Place the C-1611D/AIC transmit-inter-
phone selector switch in position 3, the RECEIV-
120.
ERS 3 switch ON, all other RECEIVERS switches
(4) Generator, Signal AN/URM-127.
off, and position the VOL control as required.
(5) Adapter.
These settings must be maintained during the
(6) Capacitor, 60 uf, 25 vdc.
test.
c. Procedure.
Control settings
Step
Performance standard
Test procedure
Test equiptment
Equipment under test
No.
a. None.
1
a. Apply primary operat-
AN/ARC-134
Set all test panel switches
ing power to test
Set meter switch to
to OFF and set EXT.
MOD I.
equipment and main-
SQUELCH CONTROL
fully counterclockwise.
AN/URM-120
tenance kit.
b. None.
b. Set the maintenance
Set above 25.
AN/URM-127
kit POWER CB cir-
Set frequency to 1000
cuit breaker to ON,
Hz.
VHF COMM OFF-
PWR switch to
PWR, the VHF
COMM frequency-
selector switches to
182.500 MHz, and
allow a few minutes
warmup period be-
fore proceeding.
c. A modulation indica-
o. Set maintenance kit
RTT switch to ON
tion should be ob-
tained on the AN/
and increase AN/
ARC-134 meter.
URM-127 output
level.
d. Set PTT switch to
OFF.
3-17
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