[amsat-bb] Re: AO-51 SSB/FM mode
n4hy at idaccr.org
Tue Oct 31 08:10:44 PST 2006
With my satellite antennas still in the garage, I can't hear it but I
can say some things to look for.
If the fades onset and release are "smooth and slow", the it is
probably induced by geometry coupled with antenna pattern. If the onset
of the fades appear to be very sudden, then I would find it more likely
this is caused by a strong interferer who "just keyed up".
Alan P. Biddle wrote:
> Over the past few days there are more and more people getting on. In a way,
> it sounds like a traditional linear transponder, with some people exactly on
> frequency, and most within a 100 Hz or so. It does allow people to break in
> more easily than the FM mode.
> One effect becoming more apparent is deep fading in the audio. I am
> wondering if this is caused by people outside the passband, but near enough
> to drive down the gain on the uplink?
> Sent via AMSAT-BB at amsat.org. Opinions expressed are those of the author.
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Robert W. McGwier, Ph.D.
Center for Communications Research
805 Bunn Drive
Princeton, NJ 08540
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