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Page Title:
Modulation Check, MIKE INPUT Circuit |
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 TM 11-6625-2609-34
(7) Dummy Load, Electrical DA-75/U.
3-13. Modulation Check, MIKE INPUT Circuit
b. Test Connections and Conditions. C o n n e c t
a. Test Equipment and Material.
the equipment as shown in figure 3-6. Connect
(1) Radio Set AN/ARC-134.
AN/URM-127 through 50- f capacitor to MIKE
(2) Power supply.
INPUT jacks on test panel (capacitor to AUDIO
jack).
Place
the
C161/DAIC
transmit-inter-
120.
phone selector switch in position 3, the RECEIV-
ERS 3 switch ON, all other RECEIVERS switches
off, and position the VOL control as required.
(5) Adapter.
These settings must be maintained during the
(6) Capacitor, 50 uf, 25 vdc.
test.
c. Procedure.
Control settings
Step
Performance standard
Test equipment
Equiptment under ted
Test. procedure
No.
1
a. None.
AN/ARC-134
a. Apply primary operat-
Set all test panel switches
ing power to test
Set meter switch to
to OFF and set EXT.
equipment and test
MOD I.
SQUELCH CONTROL
fully counterclockwise.
panel.
AN/URM-120
Set above 25.
b. None,
b. Set the maintenance
AN/URM-127
kit POWER CB cir-
Set frequency to 1000
cuit breaker to ON,
Hz.
VHF COMM OFF-
PWR switch to
PWR, VHF COMM
frequency-selector
switches to 132.500,
and allow a few min-
utes warmup period
before proceeding.
c. A modulation indica-
e. Set maintenance kit
tion should be 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.
3-14. Modulation Check, 0 DBM INPUT
Circuit
b. Test Connection and Conditions. Connect the
equipment as shown in figure 36. Connect the
a. Test Equipment and Material.
AN/URM-127 to test panel 0 DBM INPUT jacks
(1) Radio Set AN/ARC-134.
t h r o u g h the 50-uf capacitor (capacitor to HI
(2) Power supply.
j a c k ) . Place the C1611D/AIC transmit-inter-
p h o n e selector switch in position 3, the RE-
120.
CEIVERS 3 switch ON, all other RECEIVERS
(4) Generator, Signal AN/URM-127.
switches off, and position the VOL control as
(5) Adapter.
required. These settings must be maintained dur-
(6) Capacitor, 50 uf, 25 vdc.
ing the test.
c. Procedure.
Control settings
Step
Performance l taudard
Test equipment
Test procedure
Equipment under test
No.
1
a. None.
AN/ARC-134
a. Apply primary operat-
Set all test panel switches
Set meter switch to
to OFF and set EXT.
ing power to test
MOD I.
equipment and main-
SQUELCH CONTROL
AN/URM-120
fully counterclockwise.
tenance kit.
Set above 25.
3-16
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