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|  TM 11-5820-670-30
2-10. RECEIVER TONE SQUELCH SENSITIVITY TEST. (CONT)
CONTROL AND SWITCH SETTINGS
POSITION/SETTING
CONTROL OR SWITCH
EQUIPMENT
T/R
MODE SWITCH
TS-2575/ARC-131
Maximum (clockwise)
VOL
CARR
SQUELCH
30.00 MHz
FREQ set
DISTORTION
FUNCTION switch
TS-723A/U
X 10
RANGE
AF
AF-RF switch
Adjust to 30.00 MHz.
BAND SWITCH and RF TUNING CONTROL
AN/URM-103
EXT MOD
FUNCTION switch
LO 0-10 KUV
RF OUTPUT switch
LO-HI RF SET to LINE CONTROL
Adjust as required in
and LO RF UV
procedures.
10
DEVIATION RANGE KHZ switch
Midrange position
DEVIATION CONTROL
TEST PROCEDURE
1. Adjust AN/URM-103 for 30.00 MHz as indicated by minimum distortion on TS-723A/U.
2. Set the SQUELCH switch on TS-2575/ARC-131 to TONE.
3. Adjust AN/URM-127 (no. 2) output frequency to 150 Hz as indicated on AN/USM-207 readout.
4. Adjust output level of AN/URM-127 (no. 2) to produce 1 kHz deviation as indicated on
AN/URM-103 meter.
5. Adjust AN/URM-127 (no. 1) output frequency to 1000 Hz.
6. Adjust output level of AN/URM-127 (no. 2) to produce 8 kHz deviation as indicated on
AN/URM-103 meter.
7. Reduce AN/URM-103 output to minimum. Monitor audio output on the TS-723A/U meter.
8. Increase AN/URM-103 output until an audio output indication is observed.
STANDARD. Audio is present.
9. If audio is not present, see troubleshooting chart 2-12.
10. Observe AN/URM-103 output level (squelch pull-in).
STANDARD. 0.5 microvolt maximum
11. If AN/URM-103 output level is more than 0.5 microvolt, see troubleshooting chart 2-12.
2-21
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