[amsat-bb] Re: AOP-1 Circular Polarization?
Ronald G. Parsons
w5rkn at amsat.org
Sun May 18 14:42:02 PDT 2008
Assuming the antennas you reference do produce circular polarization,
radiation wise, it doesn't matter whether you mount them in an X or +
orientation. The only difference would be the phase of the radiation, and
you are not concerned with that. There could also be a difference between
right- or left-circular polarization, but whether that matters depends on
the polarization the the satellite's antenna. But X or + does not change
There might be some mechanical reason for an X or +, such as weather
proofing, but not signal wise.
> Date: Sun, 18 May 2008 14:28:34 -0400
> From: Sebastian <w4as at bellsouth.net>
> Subject: [amsat-bb] AOP-1 Circular Polarization?
> To: Amsat - BBs <amsat-bb at amsat.org>
> Message-ID: <2D502798-0BC1-4507-98F8-C86CEF5A7590 at bellsouth.net>
> Content-Type: text/plain; charset=US-ASCII; format=flowed; delsp=yes
> Hello all, I'm getting ready to put back up my old AOP-1 antennas (the
> old Cushcraft antennas that were popular in the days of AO-10 & 13).
> I'm wondering whether I should follow the same procedure of cross
> polarization for the 440 beam? It was recommended at the time to
> place the antenna in an X pattern instead of the cross pattern. Also,
> at the time, the 2 meter antenna was suggested to be placed in the
> standard vertical/horizontal polarization.
> Please let me know which would be the best method to use for most of
> today's birds.
> 73s de W4AS
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