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Page Title:
A5300 SQUELCH FILTER ALINEMENT. |
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|  TM
11-5820-401-.34-3/0967-LP-432-3060
4-21.
SILICON VERSION AUDIO AND SQUELCH PREAMPLIFIER A4300A ALINEMENT. (CONT)
ALINEMENT PROCEDURE
1.
Lift R-442 A4000 tray (1).
2.
Remove A4300A cover(2).
3.
Connect attenuated probe A to TP4007 (3). Connect alligator clip B to ground.
4.
Adjust R4304 (4) for 0.8-volt reading on MM-100E.
4-22.
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 Squelch Filter A5300 must be done before Squelch Amplifier A5200 Aline-
ment, NEW SQUELCH LEVEL, covered in paragraph 4-24.
TEST EQUIPMENT AND MATERIALS
Test Set AN/GRM-114A
T-Connector UG-274/U
Maintenance Kit MK-1978/VRC
Attenuated Probe
Rf Cable RG-58/U
Power Supply PP-1104(*)/G
4-130
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