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AO-40, IHU-2 On




Because of the increasing ALON, it is now necessary to take pictures for 
attitude determination at the end of one orbit, and download them after 
apogee on the next orbit.  This requires the IHU-2 to be left on through 
two passes of the radiation belts.  Since EDAC is not currently active on 
the IHU-2, there is an excellent chance that it will crash about every 
second or third time this is done.  A crash of the IHU-2 takes only a few 
minutes to correct, but until it is corrected the result will be an 
unmodulated tone on the middle beacon.  If you should encounter this, be 
aware that the IHU-1 is running properly in the background and the command 
team will restore the beacon ASAP.  The photos are not lost when the IHU-2 
crashes, as long as the unit is not powered off.

The eclipses are continuing to lengthen and move later in the orbit.  The 
timing of the beacon off interval will need frequent adjustment over the 
next several weeks.   The interval will shortly be moved to MA 40 to 90.

--- W4SM for the AO-40 Command Team



-- 
  ________________________________________________________________________
  Stacey E. Mills, W4SM    WWW:    http://www.cstone.net/~w4sm/ham1.html
    Charlottesville, VA     PGP key: http://www.cstone.net/~w4sm/key
  ________________________________________________________________________

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