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 TM 11-6625-1635-12
C1
signal, modulated 90 percent at 1,000 Hz, and
equipment as instructeci in paragraph 2-5 and
proceed as follows:
s e t the output attenuator for a 6-microvolt
output.
( 1 ) Leave the equipment connected as
described in a and b a b o v e .
(3) Set the VHF COMM frequency selector
switches to 132.500 MHz. An output indication
(2) Leave switches in position set at the
conclusion of b above.
s h o u l d be obtained on the TS-352B/U.
(3) Set the EXT SQUELCH CONT
(4) Connect the TS-352B/U to the DATA
SWITCH TO ON.
L I N K OUTPUT jacks. The indicated voltage
( 4 ) Adjust the AN/USM-44 output at-
should be considerably lower than that obtained
tenuator for a 0-microvolt output.
in (3) above.
(5) Slowly increase the AN--USM-44
b. Receiver Audio Output Checks. Start the
output level until the squelch opens as indicated
equipment as instructed in paragraph 2-5 and
by the presence of a tone in the headset, The
proceed as follows:
AN/USM-44 level should not be greater than 1
(1)
Leave
the
AN/USM-44
connected
microvolt.
and adjusted as described in a a b o v e .
( 2 ) On the maintenance kit unmodified,
(6) Set the AN/USM-44 output level to 0)
microvolt. Set the EXT SQUELCH CONT fully
connect the
H-216/U
to
the
test
panel
clockwise. Slowly increase t h e A N / U S M - 4 4
RECEIVER jack. On the maintenance kit
o u t p u t level until the squelch opens. The
m o d i f i e d , connect the H-101A/U to the U-
AN/USM-44 level should not be greater than
94A/U connector on the CX-2556 Cord
100 microvolts.
Assembly.
d. Channel Selection Checks. Start the
(3) Set the AUDIO switch to ON. A signal
equipment as instructed in paragraph 2-5 and
should be heard in the headset.
proceed as follows:
(4) On the maintenance kit modified, place
t h e AVC GROUNDED switch in the down
(1)
Leave
the
AN/USM-44
connected
and adjusted as described in a above. Leave the
(grounded ) position. T h e signal heard in the
h e a d s e t connected as described in b a b o v e .
h e a d s e t should increase in volume, indicating
(2) Set the AUDIO switch to ON.
that the AN/ARC-134 AVC circuit is disabled.
(3) Set the EXT SQUELCH CONT switch
Return the AVC GROUNDED switch to the up
to OFF. Adjust the AN/USM-44 output at-
position.
(5) On the maintenance kit modified, set
R E C E I V E R S switch 3 to OFF. The signal
h e a r d in the headset should disappear. In
s e q u e n c e , set RECEIVERS switches 1, 2, 4,
I N T , and NAV to ON. No signal should be
heard in the headset. Return RECEIVERS
s w i t c h e s 1. 2, 4, INT, and NAV to the OFF
position. Return RECEIVERS switch 3 to the
ON position. The signal should again be heard in
the headset.
(6) Set the EXT SQUELCH CONT switch
to ON, and adjust the EXT SQUELCH CONT
until the signal just disappears.
(7) Press the radio control COMM TEST
(5) Disconnect the AN/USM-44 and TS-
switch. The signal heard in the headset should
3 5 2 B / U from the maintenance kit and on the
indicating
increase in volume,
t h a t the
m a i n t e n a n c e kit unmodified, disconnect the
AN/ARC-134
squelch
circuit
is
disabled.
headset.
Release the COMM TEST switch.
e . Transmitter Output and Control Circuit
c. Squelch Control Circuit Checks. Start the
2-9
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