[amsat-bb] Re: antennas and schedule for AO-7?
w7lrd at comcast.net
Sun Feb 17 22:17:50 PST 2008
This post brings up an interesting issue regarding mode A. Back in the day of RS10 & 15, mode A was quite popular. I soon discovered that my 10 meter four element quad, though a hot antenna at 28.4Mhz was lousey at 29.5. In fact it received better off the back for mode A than off the front. After thinking about it, I realized the reflector was acting as a director at 29.5Mhz, and the other two directors were out of the picture. Yes the SWR was high but it was for receiving. I even went to the effort of building a 10 meter loop, "looking" up for high elevation passes. So, for those of us who still play with mode A on AO-7, flip that beam around, you might be surprised!
73 Bob W7LRD
"if this were easy, everyone would be doing it"
-------------- Original message --------------
From: Bill Dzurilla <billdz.geo at yahoo.com>
> Today I listened for the first time for AO-7. I read
> all the info pages about this bird, but did not see
> anything about a key question: when is the bird in
> mode A and when in mode B? Is there a schedule, or do
> we have to listen on both 10m and 2m until we hear the
> Anyhow, this morning there was a high pass and I heard
> the sat loud and clear in mode A, although it was not
> at all busy. Just 2 or 3 stations calling CQ on cw,
> no ssb at all. I was able to hear my own ssb signal
> on the downlink.
> Was wondering what is a good antenna for receiving the
> 10m downlink. I have a vertical that usually performs
> quite well for regular HF work, but I lost the sat
> signal when the bird was still quite high, 25 degrees
> or so. This surprised me, as the vertical has a low
> angle of radiation.
> Is there any SSB activity on this sat?
> 73, Bill NZ5N
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