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Re: Polarization switching products and/or relay recommendations



Hi Chris, KA8WFC

I have sent to you copy of the article "A Remote Polarization Switching
Unit for Crossed Yagi Antennas" by H. Stoll, DF7SO published in
VHF COMMUNICATIONS 1/1980

This unit make use of 4 coax relays and really works because the
polarization switching and matching is exact in each polarization mode
i.e. Vertical-Horizontal-LHCP-RHCP

For 2 meters I have used 4 identical coax relays that i got at low cost from
the surplus market and I have succesfully used the unit at 500 watt for
several years without any problem.

I can send copy of the above article to any one is interested on it.

Best 73" de

i8CVS Domenico

----- Original Message -----
From: "Christopher J Galbraith" <cgalbrai@umich.edu>
To: <amsat-bb@amsat.org>; <amsat-edu@amsat.org>
Sent: Tuesday, March 07, 2006 9:29 PM
Subject: [amsat-bb] Polarization switching products and/or relay
recommendations


> What sort of hardware do you use to switch polarization on crossed Yagis?
>
> The only commercial system we have found is M2, which costs roughly $200
> each.  Are there any other manufacturers out there offering less expensive
> remote switches?
>
> Also, in case we build our own, could anyone recommend relays that work
well
> up to 70cm and handle 100W of RF?  Thankfully, we have access to a good
> amount of test equipment (VNAs, etc.) so can make the phasing lines and
tune
> the switches.
>
> Thanks for any pointers,
>
> 73, Chris KA8WFC
> ----
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----
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