[amsat-bb] Re: AO-7 Mode A antennas
w7lrd at comcast.net
Sun Oct 31 11:48:26 PDT 2010
My 10M antenna is a 4 element quad which is part of a 10/15/20 M quad. I have noticed since the days of RS10/15 etc that the reception is much better off the back on 10M. If I remember (not sure) it is cut for the lower part of 10M, so at 29.45 either the reflector is acting like a director or the first director is acting like a reflector. In any event when I operate mode A I always aim the "back" to the satellite, there is a significant difference in reception between the front and back. So if you're using a multi band beam of some sort you might try "flipping " it around and see how it works. At one time I built a horizontal 10M loop hanging from a pole, then later added a reflector a few feet below it, essentially a 2 element round quad looking up. I would switch between the horiz. quad and the round quad depending on what the elevation was. Yes indeed those RS days were the good old days. I enjoyed and learned a lot back then.
73 Bob W7LRD
.----- Original Message -----
From: "John Neeley" <w6zkh at att.net>
To: "amsat-bb" <amsat-bb at amsat.org>
Sent: Saturday, October 30, 2010 8:52:43 AM
Subject: [amsat-bb] AO-7 Mode A antennas
I notice, looking at the logbook on the AO-7 website that the Europeans utilize
Mode A alot more than use here in NA. Since the downlink frequency is in the
upper 10 meter band, and I wondering what antenna they are using for receive? I
have tried dipoles, horizontal loops, G5RV, etc to pretty much zero luck in
hearing the bird, even with close passes.
Any info would be appreciated..
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