[Milsurplus] GRA-53 / GRA-54

[antqradio at sbcglobal.net]

The above are similar to the VRC-24, TRC-68 and URC-9 UHF multi-channel transceivers of the late 1950's and early 1960's.  The VRC-24 and the TRC-68 share a common manual but the URC-9 is in a class of it's own although it is the same RT unit with a slightly different die-cast front panel, is in grey instead of OD and of course, Navy.
I am curious about the heritage of the design.  If one goes by RT numbers, then it seems that the sequence is:
VRC-24 with RT-323
TRC-68 with RT-441
URC-9 with RT-581
But I have no idea where the GRA-53 and GRA-54 fit into the lineage.  When I was in the Air Force and stationed at Mactan, AB, Philippians in the late 1960's, I worked on TRC-68's, GRA-53's and GRA-54's.   Long after I was discharged I learned about the VRC-24 and URC-9 versions.
If anyone is lucky enough to have examples of the GRA's in their collection, could you please send photos of the nomenclature tags on the RT unit, power supply and case?  Stories about working on these beasts are also welcome.  Anyone have the extension cable that allows operation of the RT unit outside of the case?
Thanks in advance, Jim
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.qth.net/pipermail/milsurplus/attachments/20160901/78825c63/attachment.html>