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Re: R: Quadrifilar home brew



During the life of AO-40 I made a patch antenna that worked well with my
dish 0.3 F/D and it was easier that a QFH antenna to construct.

Art , KC6UQH
----- Original Message -----
From: "Cliff Buttschardt" <cbuttsch@kcbx.net>
To: "Edward R. Cole" <al7eb@acsalaska.net>
Cc: "i8cvs" <domenico.i8cvs@tin.it>; "AMSAT-BB" <amsat-bb@amsat.org>
Sent: Wednesday, March 16, 2005 10:15 AM
Subject: Re: R: [amsat-bb] Quadrifilar home brew


> 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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