[amsat-bb] AO-40 Update, Orbit 370

["Stacey E. Mills" <w4sm@xxxxxxxxxx>]

NEW SCHEDULE
-------------------------
The sun is moving and we are slowly approaching ALON/ALAT = 0/0 ( 
currently, ALON/ALAT = 345/2).  To take advantage of the improving solar 
angle, we have extended the U/L1 -> S2 passband from MA = 100 to MA = 120

N  QST AMSAT OSCAR-40      ***SCHEDULE***          2001-08-20
     MA    V-Rx  U-Rx  S2Tx/MB  S1Tx/EB   Rudak   L1/U passband
  240-010   ON    off    ON       off      off     off
  010-030   off   ON     ON       off      off     ON
  030-044   ON    off    ON*      off      ON      off  *MB off
  044-120   off   ON     ON       off      off     ON
  120-200   ON    off    ON       off      off     off
  200-240   off   ON     ON       off      off     off


S1/V Tx
-------
The initial tests to restart the S1 Tx have been unsuccessful.  So far, as 
can be seen in the telemetry, the S1 Tx does not draw current, change its 
output level or warm up when the ON command is sent to it.  The telemetry 
clearly shows that the command has been received.

Tests are also underway on the V-Tx.  Unlike the S1-Tx, the V-Tx does draw 
current and indicate an output when powered up.  However, no signals have 
been detected.  The command team has uploaded software to "exercise" the 
V-band relay in the hope that the problem is related to the relay 
connection between the V-Tx and the V-higain antenna.  After a week or so 
of cycling, the transmitter will tested again.

MOMENTUM WHEELS
---------------
As Peter reported earlier, initial tests of the momentum wheels have been 
successful.  A considerable number of additional tests, including software 
and sensor tests will be performed before the decision is made to deploy 
the solar panels and begin 3-axis stabilization.  Therefore, do not expect 
this in the immediate future.   We will not be attempt 3-axis mode until 
all possible scenarios, including recovery scenarios to spin stabilization 
have been satisfactorily evaluated. The team is optimistic that we CAN 
achieve 3-axis stabilization once these additional tests have been performed.

--- W4SM for the 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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