[Milsurplus] AN/ARC-58 module required (AN/TRC-75)

[Jim Whartenby]

RayAFAIK, there is no module associated with this connector.  Looking through several schematics in T.O, 12R2-2ARC58-2 of the various ARC-58 receiver/exciter incarnations, J6 has no module connected to it nor are there there any schematic notes describing anything about it's function.  
Tracing the J6 contacts, there are several grounds, two 6.3 volt inputs, one 130 volt input, one 4kc and one 1kc inputs both of which are from the Frequency Divider module.  There appear to be no outputs from this mystery connector.
Perhaps very early in the ARC-58 development, there was a need for some function but it was evidently removed from the design before the testing program of the four engineering models started in early January, 1957.  I found no mention of J6 or the elimination of a module in the progress report dated 15 April, 1957.
Could this be the ARC-58 appendix? <grin>Regards,Jim

Logic: Method used to arrive at the wrong conclusion, with confidence.  Murphy

-----Original Message-----
From: robinson at tuberadio.com
To: milsurplus at mailman.qth.net
Sent: Wed, Jan 25, 2023 10:12 pm
Subject: [Milsurplus] AN/ARC-58 module required (AN/TRC-75)

Hi all,

I am starting on an AN/ARC-58 also known as the AN/TRC-75.

My receiver R-761/ARC-58 is missing a module.
I do not know what it is,
as I have no manual.
Looking at the LHS (from the front)
there are modules
AM-1579
MD-286
then a blank with just the J6 connector.

Can someone tell me what the module number is please.

I need the radio manual as well.

I have scanned and placed the fitting to a Landrover FFR here...
http://www.tuberadio.com/robinson/Manuals/FFR_TRC75.pdf

regards
ray
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