PDS_VERSION_ID        = PDS3
RECORD_TYPE           = STREAM
OBJECT                = TEXT
 PUBLICATION_DATE     = 1999-03-23
 NOTE                 = " E-mail and other messages
                          concerning MGS Radio Science on
                          or about 1997/048."
END_OBJECT            = TEXT
END


From Carl.Kloss-Jr@jpl.nasa.gov Sun Feb 16 18:47:46 1997
Date: Sun, 16 Feb 97 18:47:44 -0800
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To: rsimpson@magellan.stanford.edu (Richard Simpson)
From: Carl Kloss Jr <Carl.Kloss-Jr@jpl.nasa.gov>
Subject: Re: MGS RST Rpt HEA7047A.TXT
Status: R

Richard,

Just for your info, the USO dropped to zero degrees C shortly after launch
when the S/C went to a sun com position (sun pointed), in which the
instruments cooled rapidly.  The zero degree mark occurred early on day
314.   Regarding the S/C systems, they were turned on 24 hours before the
first launch window, which means they were on about 48 hours prior to
launch.  The USO was turned on at about 24 hours after launch, unlike on MO
where it was powered up prior to launch and remained on thereafter.

Cheers,

Carl

--------------------------------------------------------------------
From rsimpson Mon Feb 17 09:47:05 1997
Date: Mon, 17 Feb 97 09:46:59 -0800
From: rsimpson (Richard Simpson)
To: Carl.Kloss-Jr@jpl.nasa.gov
Subject: Re: MGS RST Rpt HEA7047A.TXT
Cc: rsimpson
Status: R

Thanks, Carl.  I remembered the very low temperatures just after
launch, but didn't remember the exact sequence in which systems
were powered up.

On another subject: what exactly is happening on the spacecraft
between about 11h and 15h?  We see increases in most of the
temperatures we monitor starting about 11h; then about 15h whatever
is happening stops and the temperatures slowly decay back to "normal".
This has been going on for a month or so.  If there were an attitude
change, I'd expect some HGA activity.  You mentioned MOC bakeout
for a couple days in January, but I gather that was completed
quickly.  A couple times I've looked at the SOE and haven't
seen anything.  Idle curiosity isn't getting me anywhere...

Regards,
Dick


----------------------------------------------------------------------
From Carl.Kloss-Jr@jpl.nasa.gov Mon Feb 17 14:58:43 1997
Date: Mon, 17 Feb 97 14:58:42 -0800
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To: rsimpson@magellan.Stanford.EDU (Richard Simpson)
From: Carl Kloss Jr <Carl.Kloss-Jr@jpl.nasa.gov>
Subject: Re: MGS RST Rpt HEA7047A.TXT
Cc: richard.a.kriegbaum@ast.lmco.com
Status: R

Dick,

I talked to the project engineer, as our RF guy Stan Butman was out of the
office.  Charles Whetsel said that every day about the time you are seeing
the temperature increases, the Ka band is turned on until the temperatues
of the RF components get too hot and then they are turned off.  Eventually,
when the sun input gets lower, we won't have to cycle Ka band.

Hope that helps,

Carl