[amsat-bb] Re: AO7 in Mode B
w9ae at charter.net
Mon Jun 17 12:54:20 PDT 2013
There have been questions as to whether or not a program like SATPC32 is
calculating the solar position based on ground track or actual satellite
position in orbit, I have not reached out to find out the method of
calculations but based on how AO7 has reacted to even the briefest of
eclipse's as predicted by SATPC32, I suspect the relationship of the
satellite to the Sun is being predicted based on the actual satellite
position in orbit and not based on ground track.
SatPC32 displays "Sat in Sun" when the satellite's footprint overlaps
the sun's footprint. You can see it change to "Eclipse" when the two
footprints no longer overlap.
In practice, AO-7's solar panel probably quits generating enough power
when only a portion of the sun's "disc" is obstructed by earth.
Consequently, the satellite would quit working a bit sooner than the
actual eclipse, when 100% of the sun is shaded by earth.
This year I plan to make Field Day satellite contacts for the first time
in several years. In western Oregon I can operate the un-crowded
satellite passes where most of the footprint is over the Gulf of Alaska.
Wayne Estes W9AE
Oakland, Oregon, USA, CN83ik
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