Hi Tom,
I have also noticed the switching of polarity as the sat travels over.
What I have understood to be the mode by which this is occuring comes from the fact that circular polarized antennas change polarity as you move out of the main radiation lobe. The main lobe is circular one direction and the next lobe is reversed, and the next reversed back again.
Hope someone can correct me if I have things fouled up.
Andy
Date: Sat, 4 Aug 2012 14:13:47 -0500 Subject: Re: [amsat-bb] Antenna Polarization Technical Question From: tomdoyle1948@gmail.com To: kn6za@hotmail.com CC: amsat-bb@amsat.org
Andy,
I believe that is true but that does not explain why the optimum polarity setting on the receive end would change during a pass. Perhaps there is some sort of Faraday Rotation effect but I do not believe that it can change the direction of the circular polarized signal but who knows what magic things happen in the ether.
tnx & 73 W9KE Tom Doyle
On Sat, Aug 4, 2012 at 12:44 PM, andrew abken kn6za@hotmail.com wrote:
Hi Tom,
I thought fo-29 was transmitting circular. Would not surprise me if I was wrong:)
Andy, kn6za
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tom ...