[amsat-bb] Re: Station not coming together - the full post

Wayne Estes w9ae at charter.net
Wed Mar 7 10:26:45 PST 2007

One possible explanation for Jonny 290's high-elevation reception 
difficulty might be the polarization of the eggbeater antenna.  The 
eggbeater is linear polarization near the horizon, and right hand 
circular polarization at high elevation.  It could be that SO-50's 
signal is more left hand circular polarization.

Unfortunately this theory doesn't correlate with my own experience 
receiving SO-50 with a RHCP yagi (and a mast-mounted preamp!).  I get 
very strong signals at high elevation, but I also get "random" deep 
fades that can last several seconds at any elevation.  The "random" deep 
fades can be caused by polarization mismatch, or by the body of the 
spinning satellite temporarily obstructing a portion of the antenna.

Wayne Estes W9AE
Oakland, Oregon, USA

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