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LF: Re: RE: Loop antenna problem

To: [email protected]
Subject: LF: Re: RE: Loop antenna problem
From: "J. B. Weazle McCreath" <[email protected]>
Date: Tue, 24 May 2005 01:29:16 +0100
Delivery-date: Tue, 24 May 2005 04:21:09 +0100
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>Dear J.B., LF Group
>
>I think the problem here is the size of the coupling loop, which is only
>slightly smaller diameter than the main loop.
>
 
Hi Jim, LF Group,
 
My antenna is based on the successful design by Steve, VE7SL, with
only two differences, 1) my pickup loop is shielded, and 2) I used #12
wire rather than #20.  Could those two differences make that much of
a change in the loop operation?  I know that all other things being the
same, using the larger gauge wire would have raised the Q, but would
it change things so drastically that I'd have to use a smaller diameter
pickup loop? 
 
Steve suggested that I use a simple non-shielded pickup as he used
on his antenna.  I tried that, but I found little or no difference between
it and my shielded pickup.  Both where spaced about 6 inches inside
the main loop, just as on his antenna, which works fine.  That's what
is puzzling me, why does it work OK for him but not for me??!!
 
If I go the transformer route as you and several others have suggested,
do I need to physically remove the pickup loop or simply disconnect it?
I'm hoping the latter, as it'll be difficult to remove without lowering the
antenna!  Thanks for your suggestions and hopefully I'll get the bugs
out of the way and be able to enjoy hearing things shortly.
 
73, J.B.
 
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