This technical manual provides information for servicing
Electrical and Electronic Reference
Radio Set AN/GRC-171, Collins part number 622-1627-
001, manufactured by Collins Radio Group/ Rockwell
International, Cedar Rapids, Iowa. Radio Set AN/GRC-
171 consists of the following: Radio Receiver-Transmitter
RT-980/GRC-171, Collins part number 622-1628-001;
Requirements for Preparation of
Radio Set Control C-7999/ GRC-171, Collins part
number 622-1629-001; cable interface kit, Collins part
Technical Manuals: Title Pages, List of
number 622-7846-001; and slide mounting hardware kit,
Effective Pages, and Reproduction
Collins part number 623-5818-001. Radio Set AN/GRC-
Assembly Sheet; Photolith Negatives;
171 provides air traffic control communications at
Printing; and Binders
collocated vhf/uhf receiver-transmitter sites. The
equipment is capable of providing AM communications
Technical Manuals: Ground C-E
on any of the 7,000 channels in the 225to 399.975-MHz
Equipment Facility, Site, and System
band with 20watt AM carrier output.
Chapter 1 provides an overall electrical and mechanical
description of the equipment.
Chapter 2 provides information on installation, of the
Each equipment, unit, and assembly provided is marked
Chapter 3 provides operating instructions.
with a manufacturing alphabetic identifier in addition to
the basic part number. The alphabetic identifier will be
Chapter 4 describes the basic operating principles of the
preceded by the letters REV(revision) and will start with 0
if no changes have been processed. The first change will
be identified as A, the second as B, and continuing
Chapter 5 provides maintenance instructions, including
through Z to AA and ultimately to ZZ. Because minor
performance tests and adjustment procedures.
electrical and/or mechanical differences exist between
various revisions, where applicable, an effectivity-versus-
Chapter 6 provides information on the use of circuit
revision identifier cross-reference is provided on the
diagrams and equipment effectivity. All foldout diagrams
appear in chapter 6 of this manual regardless of their
applicability to any one chapter.
Each effectivity applies to a group of revision identifiers
and is indicated by a key (Ï) on both the effectivity table
A complete illustrated parts breakdown of the equipment
is provided in TO 31R2-2GRC171-4.
The following publications were used in the preparation
of this manual.
Abbreviations for Use on Drawings
and in Technical-Type manuals
VIIL-STD-15-1A Graphic Symbols for Electrical and