[amsat-bb] Re: Mode S Antenna question

kc6uqh kc6uqh at cox.net
Sat May 10 17:48:06 PDT 2008

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 

----- Original Message ----- 
From: "Ronald Nutter" <rnutter at networkref.com>
To: "Edward Cole" <kl7uw at acsalaska.net>
Cc: <amsat-bb at 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

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