[ARC5] Some "Command Set" Receiver Usage History

[Rich Post]

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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