Remind me as to whether the satellite's TX and RX antennas are in the same plane or 90 degrees offset? I thought the 90 degree offset was the case but maybe I am wrong A 50/50 guess here. In a 90 degree offset mode, you would always have a different antenna to antenna orientation as related to the ground station antenna orientation, if polarity on the ground antennas was the same. And since the Arrow is by design using perpendicular polarization between the two bands, you might be either in proper polarity or not, depending on satellite orientation at the instant of observation.
As was pointed out by someone else, the satellite is not spinning in a constant direction but flips and spins differently by illumination, so the fun challenge to operations. Makes it fun.
Tom Schuessler, N5HYP EM12ms
Message: 1 Date: Tue, 27 Mar 2018 21:38:51 -0500 From: Stefan Wagener mailto:[email protected] To: "Stephen E. Belter" mailto:[email protected] Cc: Burns Fisher mailto:[email protected], amsat-bb mailto:[email protected], Paul Stoetzer mailto:[email protected] Subject: Re: [amsat-bb] AO-92 fading Message-ID: mailto:CAKu8kHDabVSxHSBAj4_C0HJqNDP6cJ=a2rzwpeg9yeipf=XTTA@mail.gmail.com Content-Type: text/plain; charset="UTF-8"
Thanks Steve,
Great point and well thought out. Now, let me ask you a question: After you matched the downlink signal and position of your Arrow for maximum quieting and best signal, what happens when you now change the position of your arrow to look for best "uplink"? unless yo can keep the downlink position steady you will not be able to check for the uplink.. as science tells me one thing has to be constant for the other to be assessed...
All the best,
Stefan, VE4NSA