[amsat-bb] AO7 mode switch
K4FEG at k4feg.com
Wed Jul 31 09:31:38 PDT 2013
Hello Satellite People;
it is my opinion that we are quickly approaching the end of the Eclipse
Cycle for AO7 this season. I had previously estimated the "final"
eclipse to be on August the 2nd between 0200 and 0300 UTC but upon
closer check with fresh Kep's it looks like the eclipse durations are
decreasing by approximately 10 seconds per orbit at this time and with
the current durations of the orbits the final eclipse of 20 seconds will
end at 21:00:50UTC, when the satellite is rising over Australia.
I would guess that at that point the 24 hour mode switch will begin once
the satellite is in full illumination once again. It appears to have
been 9 full weeks of eclipse's for AO7 and over 98% of the time it
seemed to come up in Mode B, I know there were reports over Europe of a
Mode A pass on individual orbits and I had noted the same for the USA as
well, but once the satellite had gone into eclipse on the next orbital
pass it would come back up in Mode B.
In May of 2014 I hope to look at the beginning of the Eclipse Cycle and
work at predicting the beginning and end of it better.
This has been a fun exercise for me and I appreciate those from around
the world that forwarded their observations to me.
Now it is time to sit and wait to see if the switches start back on
August 2, 2013 at @21:00UTC
73 ALL FRM
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