[amsat-bb] Re: AO-51 S-Band antenna polarization

[Art McBride]

John,
>From the information of the time I researched it soon after AO-51 was
launched, I recall it was linear but polarity was pointing angle dependent.
I used a patch LH rotation feed on a 20" MDS dish with great results using a
KG5NA down converter. Being circular there was one less variable to contend
with during the short duration passes of AO-51. The gain of the dish with
the low noise figure of the down converter more than made up for the 3 dB
loss from linear to circular. 

Art,
 KC6UQH



-----Original Message-----
From: amsat-bb-bounces at amsat.org [mailto:amsat-bb-bounces at amsat.org] On
Behalf Of jmfranke
Sent: Tuesday, December 21, 2010 11:57 AM
To: amsat-bb at amsat.org
Subject: [amsat-bb] AO-51 S-Band antenna polarization

Does anyone know the polarization of the 2.4 GHz transmissions from AO-51. 
Are they circular?  If so which polarity, RHCP or LHCP?  Are they linear? 
If so is there a preferred receiving polarization?  I have examined the 
AMSAT web site and many references on the Internet, but cannot seem to find 
the answer.

Thanks,

John  WA4WDL  AMSAT member 10211 


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