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|  TM 11-.5820-401-.34-3/0967-LP-432-3060
5-10.
RECEIVER SELECTIVITY TEST. (CONT)
STANDARD. R-442/VRC CALL lamp should remain lit.
5.
If R-442/VRC CALL lamp goes off, see troubleshooting chart 5-6.
Change AN/USM-207 GATE TIME to 102.
6.
7.
Reattach T-connector to AN/USM-207.
8.
Adjust AN/URM-103 RF TUNING control for 30.019-MHz (30019.0-kHz) display on
ANAJSM-207. To produce display, follow instructions in note under step 1, but reset
AN/URM-103 LO RF UV control to level arrived at in step 4.
9. Disconnect T-connector from AN/USM-207.
STANDARD. R-442/VRC CALL lamp should be off.
10. If R-442/VRC CALL lamp is lit, see troubleshooting chart 5-6.
11. Turn ANWRM-103 RF TUNING control slowly counterclockwise until R-442/VRC CALL lamp
lights.
12. Reattach T-connector to AN/USM-207.
13. Turn ANAJRM-103 LO RF UV control clockwise until display appears on AN/USM-207. Note
frequency displayed.
14. Adjust ANAIRM-103 RF TUNING control for 29.981-MHz (29981.0-kHz) display on
AN/USM-207.
15. Disconnect T-connector from AN/USM-207.
16. Reset AN/URM-103 LO RF UV control to level arrived at in step 4.
STANDARD. R-442/VRC CALL lamp should be off.
17.
If R-442/VRC CALL lamp is lit, see troubleshooting chart 5-6.
18.
Turn AN/URM-103 RF TUNING control slowly clockwise until R-442/VRC CALL lamp lights.
19.
Reattach T-connector to AN/USM-207.
20.
Turn AN/URM-103 LO RF UV control clockwise until display appears on AN/USM-207. Note
frequency displayed.
STANDARD. The difference between the two frequencies should beat least 32 kHz.
22. If difference between frequencies noted in steps 13 and 20 is less than 32 kHz, see
troubleshooting chart 5-6.
23. Increase LO RF UV level to 1000 times reading noted in step 3.
24. Change AN/USM-207 GATE TIME to 104.
25. Reattach T-connector to AN/USM-207.
26. Adjust AN/URM-103 RF TUNING control for 30.41-MHz display on AN/USM-207. To produce
display, follow instructions in note under step 1, but reset AN/URM-103 LO RF UV control
to level arrived at in step 23.
27. Disconnect T-connector from AN/USM-207.
STANDARD. R-442/VRC CALL lamp should be off.
28. If R-442/VRC CALL lamp is lit, see troubleshooting chart 5-6.
29. Turn AN/URM-103 RF TUNING control slowly counterclockwise until R-442/VRC CALL lamp
lights.
30. Reattach T-connector to AN/USM-207.
5-32
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