Re: horizontal loop anten

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From: Rick Zabrodski (zabrodsk@med.ucalgary.ca)
Date: Sat Mar 26 1994 - 11:27:31 EST


I am fortunate enough to live on a large suburban lot with a 100 ft rear
back yard and haved played with various loops both vertical and
horizantal and fed in various flavours. My 64 foot shunt loaded tower is
clearly the better performer for anything outside of a 800 mile radius.
However, when noise is high and my dsp noise machine is taxed to the
limit I am always surprised to often read the dx better on my low (10 to
20 foot up) horizantal 80 m loop. Sure, the signal strength drops but
the noise level drops even further. As reception is the main issue for
my need I have just put the loop on the top of my bungalow home to
minimize "air pollution" and leave more space for my ongoing wire
creations. By the way, the shunt loaded tower has a 25 sq foot metal
ground screen at the base and only 8 radials between 60 and 20 feet long.
I have worked four continents cw qrp with this setup. 72 and 73 rick ve6gk>
> >
> My horizontal loop (cut for 80, though it's lost some wire, and strung roughly
> triangular, with the point about 10 feet higher than the base) is the best
> general purpose wire antenna I have experienced. It even works decently on 160
> meters, when the feedline (both legs tied together) is end-fed so the system
> works a kind of a top-loaded vertical (or is it end-loaded, end-fed random wire
> :-) ?)
>
> A vertical or inverted L may be better on the lower bands for DX. On the
> higher bands, you can't assume that all the energy "shoots straight up", as
> some QST articles a while back demonstrated via computer modelling.
>
> John K0JD
>
> -> Alice4Mac 2.3 E QWK Eval:05Mar94
>


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