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

[J. Forster]

Mike,

I really wonder about loop use on ARC5s because of the antenna connections
used- a pair of push terminals.

To get good performance out of a loop, you need good common mode rejection
at RF which means balanced wiring (and low capacitance). Terminal just
don't provide that.

If you look at other RDFs and ADFs, they all use special shieldeed cable
assemblies that are premade to only one length (I think). This applies to
the RA-10, MN-26, BC-433, ARN-6 and ARN-7.

-John

==============



> 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
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