[amsat-bb] Re: Sat antenna fixed elevation -- how many degrees is the best?
Auke de Jong
sparkycivic at shaw.ca
Wed Feb 20 05:16:33 PST 2008
----- Original Message -----
From: "Dave Guimont" <dguimon1 at san.rr.com>
To: "Bill Dzurilla" <billdz.geo at yahoo.com>
Cc: <amsat-bb at amsat.org>
Sent: Tuesday, February 19, 2008 12:48 PM
Subject: [amsat-bb] Re: Sat antenna fixed elevation -- how many degrees is
>I use home brew quadrifilars, rotate with a
>little TV rotor, 2M and 70 cm on the same mast.
>By experiment, I determined the beamwidth ~65°, so I fixed EL at 30°.
>And if the satellite downlink is strong enough to
>be heard at all I get the entire pass....
My observations mirror yours exactly, except that I find directly overhead
to be fairly hard to hear(no pre-amp) so I avoid direct-overhead passes, or
wait untill it's gone past to start talking. Since I am controlling the
radio and rad-shack rotor manually, doppler and azimuth are too fast going
overhead for me to track anyways. I also happen to use a little less
elevation, which doesn't help the overhead part one bit! I think it's a
nice compromise untill I can afford a new rotor system.
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