[Milsurplus] Looking for bits and pieces - AN/GRC-7 et al

Mike Morrow kk5f at earthlink.net
Wed Aug 14 00:44:16 EDT 2013


Robert wrote:

> You are thinking of AN/GRC-7.  AN/VRC-20, -21, -22 are the same as AN/GRC-3,
> -5, -7 except no RT-70.  Or alternatively the same as AN/GRC-4, -6, -8 plus
> AM-65/GRC.

AN/GRC-4, -6, -8 are identical to AN/GRC-3, -5, -7 except that there is
no R-108, -109, -110/GRC in the AN/GRC-4, -6, -8.

> At least according to TM 11-487A dtd 1959 there was no TM done on the 
> AN/VRC-20...22

The manual for the AN/VRC-20, -21, -22 is TM 11-642.  My copy is dated
11 July 1952, with Change 5 dated 3 April 1975 (!!!).

Anyone putting together one of these systems that use the large MT-297/GR
mount (AN/GRC-3 through 8, AN/VRC-13 to -15 and -20 to -22) should just go
ahead and assemble the full-monty AN/GRC-7.  The main components and
associated manuals for the AN/GRC-7 are:

AB-15/GR      Antenna Base for RT-68
AB-15/GR      Antenna Base for RT-70
AB-22/GR      Antenna Mast for RT-70
AB-24/GR      Antenna Mast for RT-68
AB-24/GR      Antenna Mast for RT-70
AM-65/GRC     AF Amplifier                                     TM 11-5039 
C-375/VRC     Remote Control Box, with WM-46/U cable to MT-297
C-433/GRC     Line Control Box - Remote, part of AN/GRA-6
C-434/GRC     Line Control Box - Local, part of AN/GRA-6
C-435/GRC     Re-transmission Control Box, on MT-297
CG-530/U      RG-62A/U RF Cable/Connectors, RT-68 to antenna
CG-530/U      RG-62A/U RF Cable/Connectors, RT-70 to antenna
CO-212        DC Power Cable to MT-297
CX-1070/U     Chest Set AF Cable, part of AN/GSA-6
CX-1211/U     Cable Assembly PP-112 to RT-68
CX-1213/U     Cable Assembly AM-65 to RT-70
H-33/PT       Handset
H-63/U        Chest Set AF Headset/Microphone, connects to SA-142
LS-166/U      Speaker, to AM-65
MS-117-A      Antenna Mast for RT-68
MT-297/GR     Mount with junction box and cables
PP-112/GR     Power Supply (24 VDC) for RT-68                  TM 11-5036
PP-282/GRC    Power Supply (24 VDC) for RT-70*                 TM 11-5040
PP-282/GRC    Power Supply (24 VDC) for R-110                     ''
R-110/GRC     Auxiliary Receiver                               TM 11-898
RT-68/GRC     Receiver-Transmitter 1                           TM 11-289
RT-70*/GRC    Receiver-Transmitter 2 (* 70 or 70A or 70B)      TM 11-290
SA-142/GSA-6  Chest Set Switch Box, part of AN/GSA-6
AN/GRC-7      Overall System Manual                            TM 11-284
AN/GRA-6      Control Group                                    TM 11-5038
AN/GSA-6      Chest Set Group

There are a few more small items needed that are listed in the applicable
manuals.  Without any doubt, the single most important manual to own is
the AN/GRC-7 overall system manual, TM 11-284.

When one collects all of the above, there will be more than 250 pounds
in that AN/GRC-7.  Since hams...even most military radio collectors...
gratuitously disdain this gear, almost everything can be obtained rather
inexpensively.  When it was introduced in 1949, this was world-class state-
of-the-art tactical VHF-FM gear.  Nobody else had anything remotely as
capable for years.

Mike / KK5F


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