[amsat-bb] Re: [SPAM] Re: AO=51 and Yagi Polarization

[Andrew Rich]

Last night, I went back to just a vertical yagi , single 11 eleme, from
crossed yagis.

The copy was really good, like it was when I first tested it before I adde
the second Yagi.

Just goes to show what the wrong polarisation can do


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Andrew Rich VK4TEC
vk4tec at people.net.au <mailto:vk4tec at people.net.au>
http://www.tech-software.net




-----Original Message-----
From: amsat-bb-bounces at amsat.org [mailto:amsat-bb-bounces at amsat.org]On
Behalf Of Zachary Schrempp
Sent: Thursday, 3 January 2008 11:33 AM
To: Garie Halstead K8KFJ
Cc: Clint Bradford; amsat-bb at amsat.org
Subject: [SPAM] [amsat-bb] Re: AO=51 and Yagi Polarization
Importance: Low


I have to agree with Gary. Being able to switch polarization of a
linear-polarized Yagi will help, especially at lower elevation angles.
At higher elevation angles the signal will be strong enough that it
will be discernible on the Arrow regardless of the polarization.
However, when the satellite is at lower elevation angles, the ability
to switch the polarity so that it matches the signal coming from the
satellite will provide a few extra dB of gain, which may be the
difference between solid copy and noise. This has been my experience.

73,
Zach KM7I

On Jan 2, 2008 4:39 PM, Garie Halstead K8KFJ <khyberpass65 at yahoo.com> wrote:
> Clint Bradford <clintbrad4d at earthlink.net> wrote:
>
>     > You are talking about the two satellites I regularly access using a
>   > handheld radio at about 2.5W and either an Arrow dual-band antenna
>     > or simply a longer duck.
>   >
>   > In my experiences, orienting the Arrow 90 degrees in either direction
>   > gives no discernable improvement on the RX signal: It's clear and
>   > wonderful no matter how I twist the Arrow.
>
>   My experience has been quite different Clint.  There have been times
when I've noticed a drop in signal strength, rotated my Arrow antenna 90
degrees, to find the signal strength back up.  I had been told earlier by an
experienced sat op of the FM birds that there would be shifts in
polarization during passes that I would have to correct for.  It appeared to
me his advice was correct.
>
>   73, Gary  -K8KFJ-
>   AMSAT #32574
>   Sat VUCC #125
>
>
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