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|  TM 11-5820-670-30
2.9. RECEIVER CARRIER SQUELCH SENSITIVITY TEST. (CONT)
INITIAL EQUIPMENT CONTROL SETTINGS
Set equipment controls as indicated in the following table.
CONTROL AND SWITCH SETTlNGS
POSITION/SETTING
CONTROL OR SWITCH
EQUIPMENT
T/R
MODE SWITCH
TS-2575/ARC-131
Maximum (clockwise)
VOL
CARR
SQUELCH
FREQ sel
30.00 MHz
FUNCTION switch
METER
TS-723A/U
X 10
RANGE
AF
AF-RF switch
BAND SWITCH and RF TUNING
AN/URM-103
Adjust to 30.00 MHz.
CONTROL
EXT MOD
FUNCTION switch
RF OUTPUT switch
LO 0-10 KUV
LO-HI RF SET to LINE control
Adjust for 10 microvolt.
and LO RF UV
10
DEVIATION RANGE KHZ switch
Midrange position
DEVIATION control
10
Freq dial
AN/URM-127
X 100
FREQ RANGE MULTIPLIER
As required to produce 8 kHz
OUTPUT CONTROL
deviation on AN/URM-103.
TEST PROCEDURE
1. Adjust AN/URM-127 output level for 8 kHz deviation as indicated on AN/URM-103 modulation
meter.
2. Adjust AN/URM-103 for an output of 10 microvolt at 30.00 MHz.
3. Determine that RECEIVER AUDIO OUTPUTS J107 HI - LO on test set is connected to METER
INPUT terminals of the TS-723A/U.
4. Reduce AN/URM-103 output to minimum. Observe audio output on TS-723A/U meter.
STANDARD. No audio present.
5. If audio is present on the spectrum analyzer, see troubleshooting chart 2-11.
6. Increase AN/URM-103 output until an audio output signal is observed on TS-723A/U meter.
2-17
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