[ARC5] Some "Command Set" Receiver Usage History

[Bart Lee]

Mike, Thanks for this excellent military radio history note! In the K6VK
shack a Navy ARA CCT-46145 (~ ~ R-24) sits in a triple rack with a R-23
(LF) and an ARR-2, for a little bit of (oddly mixed?)  Word War
Two navigation radio close at hand.

73 de Bart, K6VK ##

On Fri, Apr 3, 2020 at 9:01 AM Rich Post <kb8tad at gmail.com> wrote:

Thanks for the correction Mike.  Yes, my Navy CCT-46104 is roughly
> equivalent to the *R-25* (not the R-24 for which I also have a Navy ARA
> equivalent, though not unhacked)
>
> 73, Rich KB8TAD
>
> On Fri, Apr 3, 2020 at 10:06 AM Mike Morrow <kk5f at earthlink.net> wrote:
>
>> > I had acquired an ARC-5/R27 and a Navy ARA CCT-46104, roughly equivalent
>> > to the R-24.
>>
>> FWIW, here are a few side notes, written because this list has these sets
>> as part of its principle focus:
>>
>> Frequency coverage of the R-24/ARC-5 is 0.52 to 1.5 MHz. It supports a
>> loop antenna (like a DU or DW) or AN/ARR-1 (ZB) homing set. It is always
>> supplied with MX-20/ARC-5 power adapter specifically for the homing
>> adapter. Using the infrequently-seen MX-19/ARC-5 audio adapter and its
>> specially-filtered audio output from the 12A6 cathode it could serve as
>> localizer for the mercifully short-lived Air-Track ILS AN/ARN-9. (That's
>> the ILS that is mentioned without nomenclature in AN/ARC-5 manuals.) The
>> ARA equivalent CBY-/CCT-46145 supports neither loop nor ILS, but it is
>> likely the only one of the three "command set" broadcast band receivers
>> that saw significant active service with the ZB homing adapter before the
>> AN/ARR-2 homing receiver replaced both. Just as it was becoming available
>> the unfortunate R-24/ARC-5 lost its homing and ILS functions and was
>> obsolete from the start. Perhaps it potentially could have served with the
>> odd-ball T-15, -16, -17/ARC-5 MF transmitters (if in fact those saw ANY
>> service) but it was never produced in a circle-S stabilized version like
>> the R-25, -26, -27/ARC-5 communications receivers. The R-24/ARC-5 days of
>> useful active military service were likely very rare to non-existent much
>> like the SCR-274-N BC-946-B. (The USAAF appears to have usually paired
>> their AN/ARR-1 homing adapters with an ADF or RDF receiver (AN/ARN-7 on
>> B-29 aircraft) instead of a BC-946-B.) That's why these broadcast band
>> receivers are invariably new in box and and unused until the surplus market
>> grabbed them.
>>
>> The ARA CBY-/CCT-46104 covers 1.5 to 3.0 MHz, the same as the R-25/ARC-5.
>> The CBY-46104 is also part of the extremely rare (now non-existent) 1940
>> RAV liaison set of eight receivers. A.R.C.'s RAV lost out to G.E.'s 1940
>> RAX-1 liaison set of three receivers, for many extremely good reasons.
>>
>> The history of these sets in military service is what interests me, even
>> though such discussions are rare.
>>
>> Mike / KK5F
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