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|  TM 11-5820-401-34-3/0967-LP-432-3060
3-23. A5300 SQUELCH FILTER ALINEMENT. (CONT)
Set R-442/VRC SQUELCH switch to NEW ON.
6.
Adjust R5301 (3) for approximately 1-vac reading on ME-30(*)/U.
7.
Reconnect rf cable to R-442/VRC ANTENNA port.
8.
Set AN/URM-103 BAND SWITCH to range that includes R-442/VRC frequency setting.
9.
Adjust AN/URM-103 RF TUNING control to same frequency selected in step 5.
10.
Adjust AN/URM-103 DEVIATION control for 3.5-kHz reading on DEVIATION KHZ meter.
11.
Adjust AN/U RM-127 FREQ RANGE DIAL to vary frequency above and below 150 Hz while
12.
observing ME-30(*)/U. Stop at frequency that gives highest possible ME-30(*)/U reading. At
same time, adjust AN/URM-103 DEVIATION control to keep ME-30(*)/U reading between 2 and
4 vac. If adjustment of DEVIATION control is required, readjust AN/URM-127 frequency for peak
ME-30(*)/U reading.
13. Check and record AN/URM-127 modulating frequency as indicated by AN/USM-207
frequency counter. If frequency is 150 1 Hz, no alinement is necessary. If frequency is above
151 Hz, go to step 14; if below 149 Hz, go to step 17.
NOTE
In steps 14 and 17, maintain a voltage reading of 2 to 4 vac at TP5008 by adjusting the
AN/URM-103 DEVIATION control.
14. FREQUENCY ABOVE 151 HZ. Turn R5301 (3) counterclockwise slightly. Reset AN/URM-127
FREQ RANGE DIAL to obtain a peak reading on ME-30(*)/U.
15. Check frequency on AN/USM-207.
16. Repeat steps 14 and 15 until peak ME-30(*)/U reading is obtained at a frequency between 149
and 151 Hz.
3-114
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