[ARC5] A.R.C. Type 12 Receiver R-22

[Kenneth G. Gordon]

On 28 Sep 2020 at 18:20, Mike Morrow wrote:

> The R-22 is a very late addition to the A.R.C. Type 12 system. 
> Electrically, it is similar to the A.R.C. Type 12 R-10A receiver with
> these exceptions: - The R-22 frequency range is 0.54 to 1.60 MHz.  The
> frequency range of the R-10A and ALL earlier A.R.C.BCB receivers is
> 0.52 to 1.50 MHz. - Similar to the R-10A, it lacks a BFO and has
> provision for a loop antenna. - Unlike the R-10A which has three power
> or control connectors on the front panel, the R-22 has only one large
> power/control connector. - The A.R.C. control panel C-57 has a dial
> calibrated .55 to 1.6 MHz for use only with the R-23.

R-24

> - ALL R-22 units
> I've ever seen were purchased by the USAF on a 1958 order. 
> 
> A unit made so late is unlikely to be found in any of the
> commonly-available A.R.C. Type 12 manuals. 
> 
> I have a NOS R-22 receiver and D-10A 28vdc dynamotor with the same
> serial number, and C-57 control panel a few numbers different.  I
> doubt many were made.  Why the USAF wanted these in 1958 is a mystery. 

Yes.

Ken W7EKB