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R: Quadrifilar home brew



Hi AMSAT's

Additional details to get RHCP or LHCP from a Quadrifilar Helix
Antenna (as well plots and references) are available on the AMSAT Journal
May/June 2004 pagg-6 to 10

73" de

i8CVS Domenico


----- Original Message -----
From: Dave Guimont <dguimon1@san.rr.com>
To: <amsat-bb@amsat.org>
Sent: Tuesday, March 15, 2005 12:57 AM
Subject: [amsat-bb] Quadrifilar home brew


> Apparently some people are having success after constructing the
> quadrifilar antenna described at:
>
> http://home.san.rr.com/doguimont/uploads
>
> The antenna construction file is Quadfil1.zip and describes measurements
> for 2M, 435 and wx antennas.  Very inexpensive (the N connector costs more
> than the rest of the antenna) and easy to build, but measure the lengths
> carefully, particularly at 435, and obviously a short and low loss feed
line...
>
> The users keep asking me for gain figures, and I have absolutely none...
> Coverage is nearly hemispherical, and estimating 2-3 db at boresite...with
> an estimated beamwidth of 150f...
>
> I have a narrative for some comparisons at ANTEVAL.TXT.
>
> Be very happy to answer questions.  I've not tried it on AO-51, but it
> should work very well reading reports on HT users...I'm very interested in
> your successes or failures...
>
> It worked, but producing a very weak signal, when AO40 was at minimum
> squint angles...Another reason for me being anxious to do the testing on
> P3E..!!!
>
>
>
>
>
>             73, Dave wb6llo@amsat.org
>                     Disagree: I learn....
>
>                Pulling for P3E...
>
>
>
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> ----
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