[ARC5] ARC-5/SCR-274 Navagation Receivers?

[Mike Hanz]

On 4/29/2011 12:35 PM, Leslie Smith wrote:
> I'd like to add to Bob's question by noting that (at least) later ARC-5
> sets have a two-terminal attachment for the navigational loop, including
> a switching mechanism whereas the earlier ARA and BC-453 sets don't.
> What were the circumstances that led to the change, and when was it
> made.

ARC evidently developed a prototype loop antenna for the ARC-5 but it 
was never picked up by the Navy.  I think the loop capability was 
designed into the R-23 and R-24 receivers because it was relatively 
inexpensive to do so and would have provided an emergency option for 
some aircraft.  The prototype loop apparently became the basis after the 
war for a couple of offerings in ARC's commercial line of equipment for 
light aircraft.

73,
Mike