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@amsat.org [mailto:amsat-bb-bounces@amsat.org] On Behalf Of jmfranke Sent: Tuesday, December 21, 2010 11:57 AM To: amsat-bb@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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