Section III ALINEMENT AND ADJUSTMENT PROCEDURES

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

Section Ill ALINEMENT AND ADJUSTMENT PROCEDURES

Subject

Para

Page

General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5-14

5-89

Crystal Reference System (CRS) Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5-90

5-15

Local Oscillator A1500 Alinement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5-16

5-93

Local Oscillator A1500 Alternate Alinement Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5-17

5-96

Tuner A1000 Alinement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5-18

5-98

IF Discriminator A4200 Alinement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5-19

5-101

Silicon Version IF Discriminator A4200A Alinement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5-20

5-104

Audio and Squelch Preamplifier A4300 Alinement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5-21

5-107

Silicon Version Audio and Squelch Preamplifier A4300A

Alinement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5-22

5-109

A5300 Squelch Filter Alinement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5-23

5-112

Silicon Version A5300A Squelch Filter Alinement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5-24

5-115

A5200 Squelch Amplifier Alinement, NEW SQUELCH Level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5-25

5-119

Silicon Version A5200A Squelch Amplifier Alinement, NEW SQUELCH

Level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5-26

5-121

A5200 Squelch Amplifier Alinement, OLD SQUELCH Level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5-27

5-123

Silicon Version A5200A Squelch Amplifier Alinement, OLD SQUELCH

5-28

5-127

5-14.

GENERAL.

This section contains alinement instructions for use with Test Cable No. 1 and TMDE (discrete test

equipment). The instructions are presented in individual procedures which apply to a specific stage of

the receiver.

Except for the local oscillator alinements, each procedure is self-contained; that is, all necessary

instructions are provided without reference to any previously performed alinement. Therefore, it is

possible to use the procedures in this section to aline an individual module without doing any work on

other stages in the radio.

However, this maintenance approach is not recommended. It is best to perform a complete realine-

ment of all modules after replacing an individual module. This should be done even if the radio has

undergone its annual realinement less than one year prior to the repair.

Careful performance of all the instructions contained

in the alinement procedures ensures that the

radio will meet all performance standards outlined in

section I of this chapter. Although the radio may

seem to work satisfactorily if other quick-fix methods

are used, there is no guarantee that such meth-

ods will result in proper performance when the radio

is used along with secure equipment, or for other

than voice communication.

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