ALINEMENT PROCEDURE-continued - TM-11-5820-401-34-30482

TM 11-5820-401-34-3/0967-LP-432-3060

5-24. SILICON VERSION A5300A SQUELCH FILTER ALINEMENT. (CONT)

1. Lift R-442/VRC A3000 tray (1). (See test setup diagram

2. Set ME-30(*)/U to 10-volt scale.

3. Connect ME-30(*)/U positive lead to TP5008 (2), and negative lead to ground.

4. Turn AN/URM-103 DEVIATION control clockwise until DEVIATION KHZ meter indicates 8 kHz.

5. Adjust AN/URM-127 FREQ RANGE DIAL to vary frequency above and below 150 Hz while

observing ME-30(*)/U. Stop at frequency that gives highest possible ME-30(*)/U reading.

6. Check and record AN/URM-127 modulating frequency as indicated by AN/USM-207 frequency

counter. if frequency is 150 1Hz, A5300A alinement is satisfactory. If frequency is above

151 Hz, go to step 7; if under 149 Hz, go to step 10.

7. FREQUENCY ABOVE 151 HZ. Turn R5303 (3) counterclockwise slightiy. Reset AN/URM-127

FREQ RANGE DIAL to obtain a peak reading on ME-30(*)/U.

8. Check frequency on AN/USM-207.

9. Repeat steps 7 and 8 until peak ME-30(*)/U reading is obtained at a frequency between 149 and

151 Hz.

10.FREQUENCY BELOW 149 HZ. Turn R5303 (3) clockwise slightly. Reset AN/URM-127 FREQ

RANGE DIAL to obtain a peak reading on ME-30(*)/U.

11.Check frequency on AN/USM-207.

12. Repeat steps 10 and 11 until peak ME-30(*)/U reading is obtained at a frequency between 149

and 151 Hz.

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