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Page Title:
Transmitter Output and Control Circuit Test |
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 TM 11-6625-2609-34
Control settings
Step
Performance standard
Test procedure
No.
Test equipment
Equipment under test
AN/USM-44
to OFF, and EX-
a. Frequency:
TERNAL
132.500 MHz
SQUELCH switch
b. Internal Modulation:
to ON. Set EXT.
30% at 1000 Hz.
SQUELCH CON-
c. Output Level:
TROL fully clock-
0 v.
wise. Slowly in-
ME-30A/U
crease AN/USM44
output until squelch
Leave control in posi-
opens as indicated
tion last indicated in
by tone in headset.
Step 1.
b. AN/USM-44 output
b. Set AN/USM-44 out-
level should not
put to 0 uv and
be greater than
adjust EXT.
100 v.
SQUELCH CON-
TROL fully counter-
NOTE
clockwise. Slowly
increase AN/USM-
This level is set with an
internal AN/ARC-134 ad-
44 output until
justment.
squelch opens.
4
Leave controls in positions
Tone must be heard in
Leave controls in posi-
a. Set AUDIO switch to
headset at each respec-
last indicated in step 1.
tion last indicated in
ON and EXTER-
tive frequency.
Step 1.
NAL SQUELCH
switch to OFF.
6. Set maintenance kit
VHF COMM VOL
control to its mid-
position, and adjust
AN/USM-44 output
to 10 v.
c. Set maintenance kit
VHF COMM and
AN/USM-44 fre-
quency-selector
switches to each of
the following fre-
quencies.
116.00 MHz, 126.00
MHz, 136.00 MHz,
146.00 MHz, 147.00
MHz, 148.00 MHz,
149.00 MHz, 140.00
MHz, 141.00 MHz
142.00 MHz, 143.00
MHz, 144.00 MHz,
145.00 MHz, 145.10
MHz, 145.20 MHz,
145.30 MHz, 145.40
MHz, 145.50 MHz,
145.60 MHz, 145.70
MHz, 145.80 MHz,
145.90 MHz, 145,95
MHz.
3-11. Transmitter Output and Control Circuit
120.
Test.
(4) Adapter.
a. Test Equipment and Material.
( 5 ) Dummy Load, Electrical DA-75/U.
(1) Radio Set AN/ARC-134.
(2) Power supply.
b. Test Connections and Conditions. Connect the
Change 1
3-13
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