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|  TM 11-5820-401-34-3/0967-LP-432-3060
5-4. NEW SQUELCH TEST. (CONT)
CONTROL, AND SWITCH SETTINGS (CONT)
POSITION/SETTING
CONTROLORSWITCH
EQUIPMENT
BAND
R-442/VRC
30. 00
MC-TUNE-KC
NEW ON
SQUELCH
Fully counterclockwise
VOLUME
ON
POWER
ON
LIGHT
OPRATE
OPERATE/OFF/STANDBY
AN/URM-103
BAND SWITCH
30.00
RFTUNING
10
OEVIATIONRANGEKHZ
150 Hz
FUNCTION
Adjust for 3-kHz meter reading
DEVIATION
To red line
RF SET TO LINE
LO, 0-10 KUV
RF OUTPUT
Minimum setting
LO RF UV
TEST PROCEDURE
NEW SQUELCH Test at 30.00 MHz
1. Adjust ANWRM-103 RF TUNING control for 30.00-MHz display on AN/USM-207.
NOTE
To produce a display on the AN/USM-207, the AN/URM-103 rf level must be increased
by turning the LO RF UV control clockwise. When the display appears, readjust the
ANAIRM-103 RF TUNING control until the AN/USM-207 indicates 30.00 MHz, and reset
the LO RF UV control to minimum setting.
2. Disconnect T-connector from AN/USM-207.
3. If necessary, readjust AN/URM-103 DEVIATION control for 3-kHz meter indication.
4. Turn AN/URM-103 LO RF UV control slowly clockwise until R-442/VRC CALL lamp lights.
STANDARD. R-442/VRC CALL lamp should light while LO RF UV control setting is at or below 0.5 v.
5. If LO RF UV control setting is more than 0.5 v, when R-442/VRC CALL lamp lights or if CALL
lamp will not light, see troubleshooting chart 5-3.
6. Remove cable from R-442/VRC ANTENNA port.
STANDARD. R-442/VRC CALL lamp should go out. Remember, without the 150-Hz tone, Relay
K5002 will not be energized to supply the 16 volts necessary to turn on the audio amplifiers; tnerefore,
the receiver is squelched.
7. If CALL lamp does not go out, see troubleshooting chart 5-3.
8. Reconnect cable to R-442/VRC ANTENNA port.
5-10
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