[amsat-bb] Re: SO-67 Dropouts

Alan Cresswell alancresswell at xtra.co.nz
Sun Nov 15 13:00:52 PST 2009

Hi all,

Listening to some of the recordings over North America/Europe is quite
instructive and seems to conform to a consistent pattern.
Station A transmits and holds in the transponder without problems.  Station
B begins transmitting but drops out two to three seconds later when the
transponder tail ends.  On rare occasions two strong stations seem to avoid
the problem and I suspect this may be because their carriers overlap and
SO-67 sees a continuous carrier and does not trigger the transponder tail.
This may be a technique to avoid the dropouts.  Station A holds the carrier
on for a second after a call and station B may be able to overlap with A's
carrier and avoid the dropout.  Perhaps worth a try.


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