Chapter 6. CIRCUIT DIAGRAMS

TO 31R2-2GRC171-2

TM 11-5820-815-14

NAVELEX 0967-LP-544-5010

CHAPTER 6

CIRCUIT DIAGRAMS

6-1. GENERAL.

addition to the basic part number. The alphabetic

identifier will be preceded by the letters REV (revision)

and will start with 0 if no changes have been processed.

6-2. The purpose of these diagrams is to assist the

The first change will be identified as A, the second as B,

technician in understanding the component makeup and

and continuing through Z to AA, and ultimately to ZZ.

circuit arrangement in the equipment. The diagrams

Because minor electrical and/or mechanical differences

furnish the technician with visual assistance for tracing

exist between various re-visions, where applicable, an

continuity and trouble analysis and provide a reference

effectivity-versus-re-vision identifier cross-reference is

during maintenance work on the equipment. General

provided on the schematic diagram.

information pertaining to individual diagrams is included

in the form of notes on the face of each diagram.

Each effectivity applies to a group of revision identifiers

6-3. EFFECTIVITIES.

and is indicated by a key ( C< ) on both the effectivity

table and the appropriate schematic diagram.

6-4. Each equipment, unit, and assembly provided is

marked with a manufacturing alphabetic identifier in

6-5. INDEX OF DIAGRAMS.

Figure

Title

Page

FO-1

Radio Receiver-Transmitter RT-980/GRC- 171, Outline and Mounting Dimensions Diagram ............ 6-3

FO-2

Radio Set AN/GRC-171, Installation Wiring Diagram ........................................................................ 6-7

FO-3

Radio Set AN/GRC-171, Block Diagram ........................................................................................... 6-9

FO-4

D/A Servo Amplifier Module Al, Block Diagram............................................................................... 6-11

FO-5

Frequency Synthesizer Module A2, Block Diagram ......................................................................... 6-13

FO-6

Receiver RF Module A3, Block Diagram ......................................................................................... 6-15

FO-7

Audio Module A4, Block Diagram.................................................................................................... 6-17

FO-8

DC-DC Converter Module A5, Block Diagram ................................................................................. 6-19

FO-9

RF Filter Module A7, Block Diagram ............................................................................................... 6-21

FO-10

Power Amplifier Module A8, Block Diagram .................................................................................... 6-23

FO-11

Frequency Synthesizer Variable Divider, Simplified Schematic and Timing Diagram ...................... 6-25

FO-12

Frequency Synthesizer Frequency/Phase Detector, Limiter Amplifier, and Lock

Monitor, Simplified Schematic and Timing Diagram ........................................................................ 6-31

FO-13

Regulating DC-DC Converter, Functional Diagram ......................................................................... 6-33

FO-14

Radio Set AN/GRC-171, Power Distribution Diagram...................................................................... 6-35

FO-15

Radio Set AN/GRC-171, Receive Signal Diagram .......................................................................... 6-37

FO-16

Radio Set AN/GRC-171, Transmit Signal Diagram.......................................................................... 6-41

FO-17

Radio Set Control C-7999/GRC-171, Schematic Diagram ............................................................... 6-45

FO-18

D/A Servo Amplifier Module Al, Schematic Diagram ....................................................................... 6-47

FO-19

Frequency Synthesizer Module A2, Schematic Diagram ................................................................. 6-53

FO-20

Receiver RF Module A3, Schematic Diagram ................................................................................. 6-61

FO-21

Audio Module A4, Schematic Diagram ............................................................................................ 6-67

FO-22

DC-DC Converter Module A5, Schematic Diagram ......................................................................... 6-73

FO-23

Voltage Regulator Module A6, Schematic Diagram ......................................................................... 6-79

FO-24

RF Filter Module A7, Schematic Diagram ....................................................................................... 6-83

FO-25

Power Amplifier Module A8, Schematic Diagram ............................................................................ 6-87

FO-26

ALC/Modulator A8A1, Schematic Diagram...................................................................................... 6-89

FO-27

RF Preamplifier/Modulator A8A2, Schematic Diagram .................................................................... 6-93

FO-28

RF Predriver/ALC Attenuator A8A3, Schematic Diagram ................................................................ 6-95

FO-29

RF Driver A8A4, Schematic Diagram.............................................................................................. 6-97

FO-30

RF Amplifier A8A5/A6, Schematic Diagram .................................................................................... 6-99

6-1