IF DISCRIMINATOR A4200 ALINEMENT. - TM-11-5820-401-34-30336

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.)

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