Unless you like fiddling alot with a radio, it might be best to see what you have and ask Columbia what they would give for it. They stock spares, and you never know when a contract from South America will come along.. They are not too practical or so I better immortalize them here before they all go away.
TM 11-5820-540-12. Operator's and Unit Maintenance Manual for Radio Set, AN/GRC-103(V)1, AN/GRC-103(V)2, ANGRC-103(V)3, AN/GRC-103(V)4 and Extension Kit, Mast, MK-1009/GRC-103(V). 1 July 1988.
http://www.columbiaelectronics.com/an_grc_103_v__1__2__3___4_radio_sets.htm
The set, if complete, will have 5 plugin-type "RF heads" to cover its 5 bands.
220-405
395-705
610-960
695-1000
1350-1850
Here's the list of things needed for the 220-405MHz band.
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This specification covers the following units of a radio relay equipment in the frequency range 220 to 404.5 MHz and designated Radio Set AN/GRC-103(V)1.
Receiver, Radio R-1329( )(P)/GRC-103(V)
Amplifier-Converter AM-4316( )/GRC-103(V)
Transmitter, Radio T-983( )(P)/GRC-103(V)
Amplifier-Frequency Multiplier AM-4320( )/GRC-103(V)
Receiver-Transmitter, Order Wire RT-773( )/GRC-103(V)
Antenna AS-1852( )/GRC-103(V)
Mast AB-952( )/GRC-103(V)
Cable Assembly, RF CG-3444( )/U (1 ft 6 in)
Cable Assembly, RF CG-3444( )/U (3 ft 6 in)
Cable Assembly, RF CG-3443( )/U (80 ft)
Adaptor, Connector UG-1375( )/U
Cable Assembly, Special Purpose, Electrical, Branched CX-10763( )/GRC-103(V) (3 ft 6 in)
The radio set uses the following special accessories for extension of capabilities.
Extension Kit, Mast MK-1009( )/GRC-103(V)
Converter, Frequency, Electronic CV-2500( )/GRC
Cable Assembly, Special Purpose, Electrical CX-10879( )/GRC-103(V)
Dummy Load, Electrical DA-437( )/GRC-103(V)
Cable Assembly, Special Purpose, Electrical CX-10762( )/U (5 ft)
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and an alternate description:
Radio Set, AN/GRC-103(V)1
JAN Type: AN/GRC-103(V)1
Nomenclature: Radio Set
Reference: TM 11-5820-540-12
NSN: 5820-00-935-4931
Components:
T-983/GRC-103 Transmitter,
R-1329/GRC-103 Receiver,
AM-4320/GRC-103 Amplifier-Frequency Multiplier,
AM-4316/GRC-103 Amplifier Converter,
RT-773/GRC-103 Receiver-Transmitter Order Wire
Weight: 468
Mode: 500F9
Frequency Range: 220-404.5 MHz
Power Input: 115 VAC, 47-420 Hz
Power Output: 15-25 W
Number of Channels: 369
Channel Spacing: 1 MHz
Replaces: GRC-50
Security Devices: KG-27
Part of: GRC-103, MRC-115, MRC-126, MRC-127, TRC-113, TRC-145
Description: The AN/GRC-103(V) is a compact, transportable UHF-FM radio set which provides facilities for multichannel transmission and reception of PCM signals. It will accommodate up to 24 telephone channels when used with appropriate PCM multiplex equipment. The multichannel radio system can be secured by using electronic key generator TSEC/KG-27. In various configurations, the AN/GRC-103(V) can be employed as radio terminals or repeater stations. The difference between the models is the frequency range of bands I, II, III, and IV.
Source: FM 24-24, 20 May 77 & TC 24-24, 3 Oct 88 & FM 24-24, 94
Created: Wed Jul 12 21:24:04 2000
Last Modified: Wed Dec 6 09:23:54 2000
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The main issue is the spacing of the frequencies at 0.5 or 0.25 MHz apart, hams won't be too interested, mainly will be for collectors and dealers of obscure spares and sets. The bandwidth is also 300KHz wide. This is at least 10 times wider than a set any ham might consider using under normal curcumstances. Modern day alternate uses might include jamming or wideband data communications.