[ARC5] Yardney Spot Tuner (?)

[Mike Hanz]

On 11/6/2011 3:45 PM, jcoward5452 at aol.com wrote:
> I think Taigh Ramey has more info on his TwinBeech site.

That's at 
http://www.twinbeech.com/images/Radio/yardneyARC5/YardneyinTBM.pdf and 
is a terrific assessment of the system in a TBM-1C Avenger dated August 
1944, warts and all.

> I have an R-26 and R-27 racked up but no control boxes.I plan to rig 
> up something, someday...

The basic switching is shown in the docs page I referenced previously.  
All that is actually needed for changing channels on the *receiver* is a 
two pole 6 position switch, so that's the good news.  Taigh's pdf shows 
a very nice way of using such a simple solution in the photo that show 
the "special control box".  Looks like it is mounted in a "blank" C-87 
box without the holes punched into it.  It must have been nice to call 
Collins and get such on a moment's notice... :-)

Interestingly enough, there were actually Yardney tuned  R-26 and R-27 
receivers that had modified nomenclature plates on them.  I have an 
altogether too generous transfer from from AB5S that says "R-26M" on the 
top plate, and apparently reflects modification at a higher depot level 
than the field mods that form the majority of the sets.

73,
Mike