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 1997/050."
END_OBJECT            = TEXT
END


From Carl.Kloss-Jr@jpl.nasa.gov Fri Feb 21 11:37:38 1997
Date: Fri, 21 Feb 97 11:37:37 -0800
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To: rsimpson@magellan.stanford.edu (Richard Simpson),
        balmino@pontos.cst.cnes.fr, ckloss@mail1.jpl.nasa.gov,
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From: Carl Kloss Jr <Carl.Kloss-Jr@jpl.nasa.gov>
Subject: Re: MGS RST Rpt HEA7051A.txt
Status: RO

Richard,

The increase in temperature of the USO is due to the MOC turnon (in
addition to the MOC replacement heater at the same time) to keep the MOC
from getting too cold during this worst case sun input phase of the
mission.  This adds about 6 watts to the lower portion of the MOC.  With
the USO underneath the MOC (below the NADIR panel), there is some thermal
coupling to the USO.  This coupling is necessary to keep the upper
temperature of the USO from exceeding the  flight allowables, and is part
of the design trades made at LMA (with Carole Hamiltons inputs) to keep the
USO within its flight allowable temperatures and to also maintain the spec
of less than 3 degrees per hour (although I believe we are much closer to
the goal of 0.3 degrees per hour).

Cheers,

Carl

________________

>T-0315 USO_T            174   180  9.93E+00  1.18E+01  1.11E+01/2.25E-02
>402


>     Average T-0315 is up 1C to 11.1C since yesterday.  The USO temperature
>started at near 10C and had risen almost linearly to 11.8C when tracking
>ended at about 15h.  The values themselves are not alarming, but this
>departure from rather boring behavior is a surprise.

Carl Kloss Jr.
JPL MS 264-214,   Ph 818 393-5919,  Fax 818 393-5247,
email = ckloss@pop.jpl.nasa.gov