Re: R: [amsat-bb] Quadrifilar home brew

[Cliff Buttschardt <cbuttsch@xxxxxxxx>]

Ed, your suggestion is a good one.  We should note also that the site
mentioned is just an all round good one to view.   Cliff K7RR

"Edward R. Cole" wrote:
> 
> >The main reason that i have experimented on 2400 MHz Quadrifilar Helix
> >Antennas as per AMSAT Journal May/June 2004 was to find the way to
> >produce a LHCP QFA to be used as a feed in a small dish having a low
> >F/D ratio in the order of 0.3 to 0.35
> >
> >Pulling with you for P3E to verify the results !
> >
> >73" de
> >
> >i8CVS Domenico
> 
> Domenico,
> 
> I have just been studying the septum feed for eme use which is very simple to
> build and provides both LHCP and RHCP.  I am giving some thought to building
> one for my 85cm offset dish on 2.4 GHz.  Have you looked at this feed?  W1GHZ
> did an exhaustive analysis of it in 2002 or 2003.  I will likey make a plain
> one first, then add a sliding circular choke ring for comparison.  The basic
> feed is good for f/d 0.35 dishes.  Either a flared horn or choke is needed for
> f/d = 0.6 to 0.7.   At present I am using a 5-1/4 turn helix feed.
> 
> Here is a link to the septum design: http://www.ok1dfc.com/EME/emeweb.htm
> 
> 73's Ed - AL7EB
> http://www.qsl.net/al7eb
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