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Re: Suggested mode S antennas for K5GNA downconverter



Try this patch - its very easy to make, I used some scrap brass, and works
very well. It is circularly polarised although for correct sense it is 
designed for
reflection use, i.e., with a dish

http://www.kiwisat.org/23cm_patch.pdf

It was used to receive AO-40  direct and is currently in service in a 600mm
dish. Gain can be increased by using a "V" or parabolic shaped reflector 
made
of almost anything metal. An umbrella lined with aluminium foil would work 
fine.

The experts will tell you it is far from efficient however it wins on the 
simplistic,
easy to make and good performance stakes.

Terry, ZL3QL.

----- Original Message ----- 
From: "Ronald Nutter" <rnutter@networkref.com>
To: <amsat-bb@AMSAT.Org>
Sent: Monday, April 14, 2008 11:02 AM
Subject: [amsat-bb] Suggested mode S antennas for K5GNA downconverter


>I am trying to come up with a portable sat station that can fit in a
> briefcase.  I have the dipole and reflector antenna that K5GNA sells for
> his downconverter but I am looking for something compact that can fit in
> the briefcase and the reflector cant.  I have thought about the G3RUH
> patch antenna but that is a little pricey for me at this point.  Are
> there any other antennas that someone can suggest that I try for this
> quest ?
>
> Thanks,
> Ron
> KA4KYI
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