SILICON VERSION IF DISCRIMINATOR A4200A ALINEMENT.

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

SILICON VERSION IF DISCRIMINATOR A4200A ALINEMENT.

4-19.

PURPOSE. This procedure enables the integrated circuit discriminator to provide maximum separa-

tion of the audio signal from the rf carrier. Coil L4202 is adjusted to tune the fm detector portion of the

integrated circuit exactly to the 11.5-MHz center frequency.

TEST EQUIPMENT AND MATERIALS

Maintenance Kit MK-1978/VRC

Test Set AN/GRM-114A

Power Supply PP-1104(*)/G

TEST SETUP. Connect the equipment as shown in test setup diagram

. Remove R-442/VRC

bottom cover. (See paragraph 2-7.)

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

table. Inject 20-v rf at 30 MHz, 1-kHz modulation: 8-kHz deviation.

CONTROL AND SWITCH SETTINGS

CONTROL OR SWITCH

POSITION/SETTING

EQUIPMENT

See test setup diagram

AN/GRM114A;

MM-100E

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