TopBand: Construction of Small Receiving Loops

[George Guerin]

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To: topband@contesting.com
From: Bob Selbrede <k6zz@ccis.com>
Subject: TopBand: Construction of Small Receiving Loops
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     Hi Bob et. al.:
     
     Bob, K6ZZ wrote:

"Hi Guys,
     
I've been reading through the literature regarding small receiving loops 
and had a few questions that maybe someone here could answer.
     
1)  Most construction articles recommend using regular old RG-58, RG-59, 
RG-213 or similar coax, 5 feet on a side, 20 feet total length.  Jeff, K1ZM 
comments (in his book) that 75 Ohm CATV line seems to work better.  Just 
curious if anyone else has tried them both, or perhaps has something 
different/better to recommend?  Is there any reason why hardline would be 
better, or why 75 Ohm coax might be preferred over 50 Ohm coax?
     
2)  Again, most articles depict the loops installed on or near the ground 
with a small TV rotator to turn them.  Is there any reason to believe that 
installing the loop on a tower above a yagi would be any worse or better 
than on the ground or on the roof?  Would height make any difference on an 
antenna of this type?
     
If there's any interest, I'll post a summary of responses.  Thanks for reading!
     
73, Bob K6ZZ"

My guess on why 75 ohm CATV works better is that there is 
lower capacity between the center conductor and the shield 
of the loop.

It should also work for RG-59 and RG-6.

George, K8GG.


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