[ARC5] R-22 Receiver

[Mike Morrow]

Wayne wrote:

> I have an original copy of TM 11-525-25, "Maintenance Instructions Radio Set
> ARC Type 12" dated April 1958.

I do as well.  The military manuals for A.R.C. Type 12 generally lack the detailed parts tables with the part numbers.  The actual commercial A.R.C. Type 12 manuals usually have the frequency-related parts and their numbers in a small table somewhere, but not the military manual.  
 
> It does not cover the R-22 but has the R-10A as well as the R-11A.  While it has
> descriptions, schematics, wiring diagrams and detailed troubleshooting instructions,
> it does not have the ARC part numbers for the components.

That's right...those have to be found in manuals actually issued by A.R.C.
 
> I would guess that the R-22 has the same tuning cap as the R-11A.

That would be part 12150 for the R-10A and the R-11A.  But A.R.C. assigned different part numbers for the 239 kHz IF cans in the R-10A (14266, 14267, 14268) than they did for the 239 kHz IF cans in the R-22 (18197, 18198, 18199), so I would NOT bet that the main tuning capacitor in the R-22 has the same part number as the one in the R-10A (12150).

Technical info on the R-22 is not easy to find.  I doubt that the US military bought R-22 models.

Mike / KK5F