Re: [IRCA] Longwave Crate Loop update

[satya@xxxxxxxxxxxx]

Hi Rich:

Thanks for the recommendation. I have a coupler like that, and just tried
it.  I used 2 turns of wire as the sense coil at various spots along the
face of the main coil on the big loop to find the best spot - didn't seem
to matter a whole lot where I put the sense coil.  After hooking the
coupler to the sense windings, the results weren't too shabby, but not as
good as having the receiver right up to the Crate Loop, which makes sense
given that there are losses to be expected with the two stages of
tranformer.

I also tried both passive loops with Ultralight receivers and the Quantum
Loop (with its 8" ferrite).  With these, all of them did better with the
28x42 loop rather than the much smaller (13x15) Crate Loop, so I am coming
to the conclusion that it is the unique characteristics of the 7600GR that
make it better (5 db or so) with the Crate Loop than with the bigger loop.

Kevin

> I take it that you are passively coupling the big loop to the radio by
> proximity?
>
> I'm wondering whether yo have tried coupling the big loop into the
> radio's internal ferrite loopstick antenna? I've been doing this on a
> Sony 2010 for years. I
>
> It's a simple matter to do. On a MW loop and depending on the loop size,
> you need 2 to 4 turns at the loop's center (the cold side). These feed
> to a piece of twin lead or lamp cord, then on to a short ferrite bar,
> maybe an inch or two in length. Wind turns around this, start with 10 to
> 20. Experiment for best coupling. Move the little ferrite bar around
> until it is coupling the best into the built in ferrite.
>
> Sony sells, or did, an antenna coupler like this for the 2010 in a
> little stand of the right height.
>
> The method has worked well for me. Ideally, one might want to have the
> radio/external ferrite combo rotatable along with the loop (but at right
> angles) to allow for nulling, if you need to do that.
>
> Rick Kunath
>
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