MRC-87 Radio Set installed on a M151-A2 Jeep, Circa 1981
TRC-75 HF radio located in rear seat compartment
It is a 1KW HF SSB radio built by Collins in the early '60s. The TRC-75 uses ARC-58 radio components and is a component of both the MRC-83 & MRC-87 sets. (ARC-58 black boxes also show up in the TSC-15 "Communications Central" radio shelter and many ARC-58 modules are used in the URC-32.)
The MRC-83 and the MRC-87 were similar - one carried an ARC-55 UHF AM radio as well as the TRC-75 and was mounted in an M-170, and the other (TRC-75 only setup) was mounted in an M-38A1.
Both the -83 & -87 sets used the same PP-2352 power supply (mounted in a watertight box below the TRC-75) to produce 115 V 400~ 3ph power, and both required a _large_ alternator setup. Both sets use a 32' fiberglass whip for fixed ops or just the top 16' of the whip for mobile ops.
Source: http://webs.lanset.com/buzz/M38A1Radio.html
