A5200 SQUELCH AMPLIFIER ALINEMENT, OLD SQUELCH LEVEL.

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

5-26. SILICON VERSION A5200A SQUELCH AMPLIFIER ALINEMENT, NEW SQUELCH LEVEL. (CONT)

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

2. Set ME-30(*)/U to 0.3-volt scale.

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

4. Turn AN/URM-103 DEVIATION control clockwise until ME-30(*)/U reads

0.20 0.01 vac.

5. Adjust NEW Squelch Resistor R5207(3) until R-442/VRC CALL light just comes on.

6. Turn AN/URM-103 DEVIATION control counterclockwise until ME-30(*)/U reads

0.15 0.01 vac. R-442/VRC CALL light should be off.

NOTE

If CALL light does not go off in step 6, repeat steps 4 and 5.

5-27 A5200 SQUELCH AMPLIFIER ALINEMENT, OLD SQUELCH LEVEL.

PURPOSE. This procedure adjusts the receiver sensitivity to the OLD SQUELCH signals which

include internal noise and the received carrier.

TEST EQUIPMENT AND MATERIALS

Signal Generator AN/URM-103

Matching Unit CN-901/U

Frequency Counter AN/USM-207

T-Connector UG-274/U

Power Supply PP-1104(*)/G

Loudspeaker LS-454/U

Test Cable No. 1

Voltmeter ME-30(*)/U

Signal Generator AN/URM-127

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