[Antennas] Single feed on 5 band quad

Thu, 24 Oct 2002 22:41:29 -0400 (EDT)

 Hi Jaap:

   I have spoken with the Owners of both Gem Quad and Cubex and both have fed their quads with a single feed line, claiming it worked well.  They both said that if there is any compromise, it was minimal.  

   After reading all the articles on the subject, consisting of both theoretical and actual experiences, I decided to feed my 4 element quad (a Gem Quad) with two feed lines.  One for 20/15/12 and one for 17/10.  Looking at harmonics, this seemed to isolate the elements that might interact.  In addition and if you are going to use a remote switching arrangement [to utilize a single coax lead in from the antenna location], you should try to make sure your switching arrangement shorts the lines that are not in use.

  Good luck.

Ron W7MRR

 --- On Thu 10/24, Jaap de Jonge  wrote:
From: Jaap de Jonge [mailto: [email protected]]
To: [email protected]
Date: Thu, 24 Oct 2002 09:44:02 +0200
Subject: [Antennas] Single feed on 5 band quad

> Hi all,
> 
> I'm considering building or buying a 5 band HF quad (10 thru 20 meter).
> There's a local antenna company, that markets a model that has a single
> feed for all the elements from 10 to 20 meter. You can see a picture of
> it at http://www.gbanttow.nl/GBFGQUADmessung.htm . I'm interested in the
> following:
> 1) Isn't the radiation pattern of such an antenna severely compromised
> (side lobes etc.), because of mutual interaction of the radiators?
> 2) Can anyone tell me from experience if this concept works or not?
> 3) Has anyone ever modeled such a quad with a single feed using antenna
> modeling software?
> 
> Thanks for the assistance!
> 
> 73
> Jaap
> PA8DX
> 
> 
> 
> - - - 
> 
> Your moderator for this list is:
> Larry Wilson KE1HZ [email protected]
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