A5300 SQUELCH FILTER ALINEMENT. - TM-11-5820-401-34-30476

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

5-22. SILICON VERSION AUDIO AND SQUELCH PREAMPLIFIER A4300A ALINEMENT. (CONT)

1. Turn AN/URM-103 DEVIATION control clockwise until DEVIATION KHZ meter reads 8 kHz.

2. Set ME-30(*)/U to 1-volt scale.

3. Lift A4000 tray (1). (See test setup diagram

4. Remove A4300A cover (2).

5. Connect ME-30(*)/U positive lead to TP4007 (3) and negative lead to ground.

6. Adjust R4304 (4) for 0.8-vac reading on ME-30(*)/U.

5-23. A5300 SQUELCH FILTER ALINEMENT.

PURPOSE. This procedure adjusts the gain of Squelch Amplifier A5200 in the NEW SQUELCH mode

of operation. By adjusting Resistor R5301 in the squelch filter, the filter is properly tuned to attenuate

the 150-Hz squelch tone, thus providing maximum degenerative feedback to the squelch amplifier for

all frequencies other than 150 Hz. This permits the squelch amplifier to provide maximum gain for 150-

Hz signals. Alinement of the A5300 squelch filter must be done before the A5200 Squelch Amplifier

Alinement, NEW SQUELCH Level, paragraph 5-25.

TEST EQUIPMENT AND MATERIALS

Matching Unit CN-901/U

Signal Generator AN/URM-103

T-Connector UG-274/U

Signal Generator AN/URM-127

Loudspeaker LS-454/U

Power Supply PP-1104(*)/G

Voltmeter ME-30(*)/U

Frequency Counter AN/USM-207

Test Cable No. 1

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

. Remove

R-442/VRC top cover. (See paragraph 2-7.)

5-112