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TM 11-5820-401-34-3/0967-LP-432-3060
4-17. TUNER A1000 ALINEMENT. (CONT)
Mixer Adjustment
17. Set R-442/VRC MC-TUNE-KC control to 52.00 MHz.
18. Set AN/GRM-114A FREQUENCY MHz thumbwheels to 052 000 0.
19. Adjust C1404 (16) for highest SINAD reading.
4-18.
IF DISCRIMINATOR A4200 ALINEMENT.
PURPOSE. This procedure enables the discriminator to provide maximum separation of the audio
signal from the rf carrier. Adjusting for zero vdc at TP4003 ensures that T4208 and T4207 are
conducting equally around the carrier frequency. Adjusting for maximum ac at TP4007 ensures that
the discriminator is tuned exactly to the 11.5-MHz center frequency.
TEST EQUIPMENT AND MATERIALS
Test Set AN/GRM-114A
Maintenance Kit MK-1978/VRC
Power Supply PP-1104(*)/G
T-Connector UG-274/U
TEST SETUP. Connect the equipment as shown in test setup diagram
. Remove R-442/VRC
bottom cover. (See paragraph 2-7.)
4-120


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