[GreenKeys] RADIO TELETYPEWRITER AN/GRC-46

[Duncan M. Brown]

The AN/GRC-46 consisted of the radio (AN/GRC-19) and TTY equipment mounted
in a S-144 type shelter, which was typically mounted on a 3/4 ton M37
truck. 
 
The AN/VRC-29 consisted of the same radio & TTY equipment mounted in an
armored personnel carrier (no shelter).
 
See TM 11-5815-204-10 & TM 11-5815-204-20 on Google Books. (These manuals
were originally printed in 1959/60, but the most recent change notice shown
is June 1980.) The AN/GRC-142 "replacement" was fielded in 1967 ( I saw one
at our Batallion HQ in Viet Nam in 1967.) But apparently the GRC-46 must
have been pretty good to be still in service about 15 years after it was
"replaced" by the GRC-142.
 
The primary power was 28VDC which could be supplied by the vehicle (or an
external generator), thus the GRC-46/VRC-29 could be operated "mobile".
(There were 28VDC motor-generators to provide 115VAC for the TTY & crypto
equipment.)
 
Have fun,
 
Duncan
 
 
> [Original Message]
> From: <WA5CAB at cs.com>
> To: <greenkeys at mailman.qth.net>
> Date: 02-Aug-10 23:36:59
> Subject: Re: [GreenKeys] RADIO TELETYPEWRITER AN/GRC-46
>
> The vehicular set was actually AN/VRC-29. The primary component of 
> AN/VRC-29 and AN/GRC-46 is AN/GRC-19. The primary component of AN/GRC-142
is 
> AN/GRC-106.
>
> In a message dated 8/2/2010 9:59:04 PM Central Daylight Time, 
> NNN7DXB at aol.com writes: 
> > To expound a bit on what Duncan just mentioned:
> > 
> > For those who don't know, the AN/GRC-46 is a Radio Teletype set (rig)
> > that was originally mounted on the M-37 series 3/4 ton truck. The
> > AN/GRC-46 was used primarily by the US Army in tactical units. Power
> > was supplied by a 5 KW generator set on a trailer. This equipment was
> > in use until about 1969. After that, it was superseded by the AN/GRC-142
> > which was an upgraded model with the same capabilities. Primary
> > Teletype equipment was Kleinschmidt TT-98/FG printer and TT-76/C
> > Reperforator-Transmitter (TD), or any of their variants. Crypto gear
> > was the usual TSEC/KW-7 - for both the AN/GRC-46 and AN/GRC-142.