[ARC5] What was "test unit" "I-85-D" made for the Signal Corps - US Army by Western E

[Michael Hanz]

On 3/26/2017 4:13 AM, Leslie Smith wrote:
>   On this page - http://aafradio.org/docs/Command_Set_Test.html -  you 
> will see a test set I-85-A (for testing transmitters) and below it a 
> unit (I-85-B) is mentioned.
>   Looking at these, it is clear that the last character does NOT 
> denote a minor revision, but a completely different item, with a 
> different function.  To answer your "Q" - I have no answer to your 
> question.

Well, I would say you answered it to the best of known data, Les.  I 
would have termed it slightly differently, as the I-85-* series, (to 
include the "I-85-B" renomenclatured as the TS-58/GRM-1 to comport with 
the A/N designation system), was all about testing the _transmitters_ in 
command sets, to include the VHF T-23/ARC-5.  In that sense, an I-85-D 
should have that same basic function.  I have seen a couple of similar 
skips in the last letter, presumably to supply a device that was a 
throwback to a previous version  - one that was apparently desired by a 
tiny segment of customers perhaps unsatisfied with a more modern 
replacement provided by the "system", and were successful in getting a 
contract issued for same.  Stranger things have happened... :-)

It would be useful to have a photo of this mysterious test set.  Ed?

  - Mike  KC4TOS
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