A5200 SQUELCH AMPLIFIER ALINEMENT, NEW SQUELCH LEVEL.

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

3-24.

SILICON VERSION A5300A SQUELCH FILTER ALINEMENT. (CONT)

Lift R-442/VRC A3000 tray (1). (See test setup diagram

Set ME-30(*)/U to 10-volt scale.

Connect ME-30(*)/U positive lead to TP5008 (2), and negative lead to ground.

Turn AN/URM-103 DEVIATION control clockwise until DEVIATION KHZ meter indicates

8 kHz.

Adjust AN/URM-127 FREQ RANGE DIAL to vary frequency above and below 150 Hz while

observing ME-30(*)/U. Stop at frequency that gives highest possible ME-30(*)/U

reading.

Check and record the AN/URM-127 modulating frequency as indicated by AN/USM-207

frequency counter. If frequency is 150 1 Hz, A5300A alinement is satisfactory.

If frequency is above 151 Hz, go to step 7; if under 149 Hz, go to step 10.

FREQUENCY ABOVE 151 HZ. Turn R5303 (3) counterclockwise slightly. Reset AN/URM-127

FREQ RANGE DIAL to obtain a peak reading on ME-30(*)/U.

Check frequency on AN/USM-207.

Repeat steps 7 and 8 until peak ME-30(*)/U reading is obtained at a frequency between

149 and 151 Hz.

FREQUENCY BELOW 149 HZ. Turn R5303 (3) clockwise slightly. Reset AN/URM-127 FREQ

10.

RANGE DIAL to obtain a peak reading on ME-30(*)/U.

Check frequency on AN/USM-207.

11.

Repeat steps 10 and 11 until peak ME-30(*)/U reading is obtained at a frequency

12.

between 149 and 151 Hz.

A5200 SQUELCH AMPLIFIER ALINEMENT, NEW SQUELCH LEVEL.

3-25.

PURPOSE. This procedure adjusts the receiver sensitivity to the 150-Hz NEW SQUELCH tone.

TEST EQUIPMENT AND MATERIALS

Matching Unit CN-901/U

Signal Generator AN/URM-103

T-Connector UG-274/U

Frequency Counter AN/USM-207

Loudspeaker LS-454/U

Power Supply PP-1104(*)/G

Voltmeter ME-30(*)/U

Maintenance Kit MK-1978/VRC

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

Remove R-442/VRC top

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