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|  TM 11-5820-401-34-3/0967-LP-432-3060
RECEIVER SELECTIVITY TEST. (CONT)
4-10.
TEST PROCEDURE
1. Turn AN/GRM-114A RF LEVEL control (1) slowly clockwise until R-442/VRC CALL lamp lights.
Note RF LEVEL setting.
2. Increase RF LEVEL to twice indication noted in step 1.
STANDARD. R-442/VRC CALL lamp should stay lit.
3. If R-442/VRC CALL lamp goes off, see troubleshooting chart 4-10.
4. Set AN/GRM-114A RF FREQUENCY M1-fz thumbwheels (2) to 030019.0 (30.019 MHz).
STANDARD. R-442/VRC CALL lamp should go off.
5. If R-442/VRC CALL lamp stays lit, see troubleshooting chart 4-10.
6. Decrease AN/GRM-114A RF FREQUENCY MHz thumbwheel setting (2) in 1-kHz steps until
R-442/VRC CALL lamp lights. Note FREQUENCY MHz setting (2).
7. Set AN/GRM-114A RF FREQUENCY MHz thumbwheels (2) to 029981.0 (29.981 MHz).
STANDARD. R-442/VRC CALL lamp should go off.
8. If R-442/VRC CALL lamp stays lit, see troubleshooting chart 4-10.
9. Increase AN/GRM-114A RF FREQUENCY MHz thumbwheel setting (2) in 1-kHz steps until
R-442/VRC CALL lamp lights. Note RF FREQUENCY MHz setting (2).
10. Subtract frequency noted in step 9 from frequency noted in step 6.
4-28
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