AN/GRC-103(V) RADIO

SPECIFICATIONS

Type: UHF FM transmitter/receiver.  NSN 5895-01-101-1442US. It is mostly solid state except for the final RF stage in the transmitter which is vacuum tube,   This radio can be used as a repeater or a radio terminal. The multichannel radio system can be secured by using electronic key generator TSEC /KG-27. The difference between the models is the frequency range of bands I, II, III, and IV.
Frequency coverage: 220 to 1830 MHz in five bands.  The frequency of operation is dependent on the RF heads installed in the transmitter and receiver, Unable to find the meaning for Band M. in the table below.

Modes: Telephony, telegraphy, radioteletype , pulse code modulation and facsimile.
Data rate: 1 Mbps
Power out:: Varies. 30 watts on lowest band and scales down to 15 watts on the highest band.

Input power:  115/230  volts AC , 70 VA  47 to 420 Hz
Circa:  First classified in 1968. First production run in 1972.

Comment:The AN/GRC-103, was developed under a joint Defence Development Sharing Agreement (DDSA) between Canada and the United States and is considered to be the first military digital radio-relay system. Some units were still in service in 2017.
 
 

AN/GRC-103(V) system.  The modules which comprise this set are featured below. (Image courtesy Tpub.com)

Canadian Marconi was likely one of several companies that produced the GRC-103(V) radio.

Closeup of T-983(P)/GRC-103(P) transmitter. Download image to enlarge. (image via E-bay)

Closeup of the AM-4320B/GRC-103(V) amplifier/frequency multiplier. Download image to enlarge.. (Image via E-bay)

AM-4320B nameplate.

R-1129(P)/GRC-103(V) receiver  Image courtesy Live Auctioneers)

AM-4316 /GRC-103 Amplifier Converter. (Image via E-bay)

RT-733/GRC103(V) receiver-transmitter order wire. An order wire is a voice communications system used primarily by maintenance personnel to talk between equipment sites. It is a telephone system but has no central office switching. It uses a portion of the network's bandwidth that is not normally used for traffic such as the bottom portion of the base-band spectrum or a portion of an overhead bit stream. Shown here is the storage compartment for the handset. (Image via Radionerds)

AS1852/GRC-103(V) antenna. This is one of two styles available for this radio system. Bands I to III use a corner reflector  (Image via Radionerds)

AS 3047/GRC-103(V) parabolic  antenna for Band IV only  - 1360 to 1850 MHz  (Image via Radionerds)

The Canadian Marconi DA-437/GRC-103 is a general purpose 50 ohm  dummy load  which can handle up to 50 watts and is the recommended one for this radio NSN: 5985-00-089-8990 .  (Image courtesy American Radio Supply)

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Contributors and Credits:

1) Tpub.com  http://armycommunications.tpub.com/SS07328/SS073280161.htm
2) AS832 antenna https://radionerds.com/images/8/88/TM_11-5820-540-34P.PDF
3) RT733 Order wire https://radionerds.com/images/8/88/TM_11-5820-540-34P.PDF
4) T983 sprcs  http://www.columbiaelectronics.com/an_grc_103_v__1__2__3___4_radio_sets.htm
5) RT-733 explanation  https://www.dpstele.com/rtu/orderwire/index.php
6 GRC-103 manual    https://military.trcvr.ru/wp-content/uploads/2016/04/TM11-5820-540-12.pdf
7) Dummy Load   https://www.americanradiosupply.com/canadian-marconi-da-437-grc-103-50-watt-military-radio-dummy-load/
8) https://apps.dtic.mil/dtic/tr/fulltext/u2/b019019.pdf
9) GRC-103  info https://apps.dtic.mil/dtic/tr/fulltext/u2/b019019.pdf
10) https://www.ultra-tcs.com/products-solutions/legacy-products/angrc-103

Aug 6/20