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Re: Mode S Antenna question



Ron,
AO-51 is linear polarized. A cicrular polarized antenna of either rotation 
will minimize fading from Spacecraft rotation. With a linear to circular you 
lose 3 dB of gain and you have no cancelation for ground and building 
reflections that can be more severe than Spacecraft rotation depending on 
terrain.
Art, KC6UQH


----- Original Message ----- 
From: "Ronald Nutter" <rnutter@networkref.com>
To: "Edward Cole" <kl7uw@acsalaska.net>
Cc: <amsat-bb@AMSAT.Org>
Sent: Saturday, May 10, 2008 2:43 PM
Subject: [amsat-bb] Re: Mode S Antenna question


> What got me thinking about the circular polarized type of antenna is to
> minimize the signal dropouts from the satellite as it spins.  My other
> thought was to put a second antenna up, orient it horizontally and put a
> remote antenna switch in place so that I can flip between vertical and
> horizontal.  Is my idea sound or am I barking up the wrong tree ?
>
> Ron
> KA4KYI 

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