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RE: Helix Match


Thanks for the drawing. Your picture shows exactly the antenna 
I was talking about.
I think I have all the necessary information in my Handbook,
so please don't waste your time scanning the QST article.
A few weeks ago, I buyed all the necessary stuff to build
such an antenna (cupper pipe, PTFE, chicken wire, etc).
So, more to come when the prototype is built and tested :+))


Jean-Louis F6AGR

> -----Message d'origine-----
> De: Ronald Long [mailto:rlong3@columbus.rr.com]
> Date: vendredi 28 janvier 2000 14:13
> À: Jean-Louis.RAULT@tcc.thomson-csf.com
> Objet: RE: [amsat-bb] Helix Match
> At 09:48 AM 1/28/2000 +0100, you wrote:
> >In an Engineer's HandBook, I've seen a description a 4 helix
> >antenna sharing a common reflector and common connector.
> >A common coax connector is installed right in the middle of the
> >reflector, and a wire runs from this connector to each helix.
> >Each wire is NOT parallel to the reflector and is supposed
> >to convert the wxyz ohms of each helix to a 200 ohms impedance
> >(200/4 = 50 ohms at the connector level).
> >This seems to be a very clever theoretical solution.
> >But what about real world ? So many parameters are interacting :+))
> There was an article on a helix array with this type of feed 
> in QST August 
> 1963. I could scan it for you if you are interested. I did 
> scan just one of 
> the figures and am including it (helix.jpg). I hope you don't mind 
> receiving the attachment. I usually ask before sending.
> 73, ron w8gus.
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