Specifications

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
EQUIPMENT
TS-2575/ARC-131
TS-723A/U
AN/URM-103
AN/URM-127
CONTROL OR SWITCH
MODE SWITCH
VOL
SQUELCH
FREQ sel
FUNCTION switch
RANGE
AF-RF switch
BAND SWITCH and RF TUNING
CONTROL
FUNCTION switch
RF OUTPUT switch
LO-HI RF SET to LINE control
and LO RF UV
DEVIATION RANGE KHZ switch
DEVIATION control
Freq dial
FREQ RANGE MULTIPLIER
OUTPUT CONTROL
POSITION/SETTING
T/R
Maximum (clockwise)
CARR
30.00 MHz
METER
X 10
AF
Adjust to 30.00 MHz.
EXT MOD
LO 0-10 KUV
Adjust for 10 microvolt.
10
Midrange position
10
X 100
As required to produce 8 kHz
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.
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