Posted by
John Magliacane on
Apr 11, 2005; 7:36pm
URL: http://elecraft.85.s1.nabble.com/Non-resonant-attic-loop-tp376882p376886.html
> I'm needing to install an antenna in my new home. An attic loop is a
> necessity ... can't run an outside wire easily.
>
> I'm assuming that an 88-ft loop will be non-resonant in all bands 80-10,
> and fed with ladder line to the tuner should work.
>
> Other suggestions?
Gene,
A small, closed loop operated below resonance will have a very
low feedpoint impedance. While it will radiate virtually all the RF
it is fed, its low impedance might be tough to efficiently match to a
50-ohm unbalanced transceiver.
So, instead of making just a single turn loop, how about making a two
(or more) turn loop, instead? This would bring the natural resonant
frequency of the antenna significantly below that of a single turn loop.
If planned out correctly, you might be able to find the ideal dimensions
of a multi-turn loop that will provide self-resonance on the low end of
80-meters. Anything above that in frequency should be easy to match
as others have already mentioned.
Just a thought...
Good luck!
73, de John, KD2BD
Visit John on the Web at:
http://www.qsl.net/kd2bd/
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