CONTROL AND SWITCH SETTINGS - TM-11-5820-401-34-30455

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

5-15. CRYSTAL REFERENCE SYSTEM (CRS) TEST. (CONT)

INITIAL EQUIPMENT CONTROL SETTINGS. Set equipment controls as indicated in the following

table. If using alternate equipment, inject 100-v rf at 30 MHz; 1-kHz modulation; 8-kHz deviation.

CONTROL AND SWITCH SETTINGS

POSITION/SETTING

CONTROL OR SWITCH

EQUIPMENT

POWER

ON-RESET

R-442/VRC

BAND

30. 0

MC-TUNE-KC

C l o c k w i s e one-third turn

VOLUME

NEW OFF

SQUELCH

OPERATE (allow 15-minute warmup)

OPERATE/OFF/STAND BY

AN/URM-103

1000 Hz

FUNCTION

BAND SWITCH

30.00 (check on counter)

RF TUNING

DEVIATION RANGE KHZ

LO, 0-10 KUV

RF OUTPUT

Fully counterclockwise

DEVIATION

Adjust until needle on IF UV RF SET TO LINE

RF SET TO LINE

meter is over red line

LO RF UV

100v

AN/USM-207

POWER

TRACK (allow 5-minute warmup)

DISPLAY

MIN (fully counterclockwise)

PLUG IN

SENSITIVITY

FREQ

FUNCTION

104 (black knob)

GATE TIME

DIRECT/HETERODYNE

DIRECT

0.3 V MAX (both switches to left)

INPUT

100

FREQUENCY TUNING-MC

TEST PROCEDURE

NOTE

Check the frequency counter to make sure that the signal generator is outputting exactly

30 MHz. The rf level must be increased temporarily to enable the frequency counter to

display. Adjust the AN/URM-103 RF TUNING control as necessary, reset to 100-v rf

level; then disconnect the T-connector from the counter.

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

1000-Hz tone will be heard on speaker. If no tone is heard, CRS may be defective. Make

sure T-connector is disconnected from counter.

Adjust R-442/VRC VOLUME control for comfortable level.

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