[amsat-bb] AO-7 Mode A Performance

John Papay john at papays.com
Sun Jul 29 18:33:47 PDT 2012


Mode A seems to be more tolerant of lower power coming
from the solar panels than Mode B.  Still you can tell
that the satellite is suffering.  A 5 watt CW signal will
cause the bird to FM but it is not driving the bird to its
maximum power capability.  I heard N4ASF much louder on it
in CW on the 2030utc pass today also with fm'ing.  This has been
my observation of Mode A in the past.  Prior to the eclipse
periods it was possible to hit Mode A with a lot of power and
it would not complain very much.  The 10m transmitter must use
a lot less power than the 2 meter transmitter.  Therefore it is
more tolerant of the lower solar panel power.

AL7RS reported that he heard AO-7 with a clean CW signal coming
back down in AP65.  This could be an indication that sun angle
in certain parts of the orbit is the major cause of the problems
that I'm seeing here.  Hopefully the solar panels will start
producing more power soon.

73,
John K8YSE



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