PDS_VERSION          = PDS3
RECORD_TYPE          = STREAM
OBJECT               = TEXT
PUBLICATION_DATE       = 1998-01-29
NOTE                   = "MGS RST Instrument Health Report HEA8029A.TXT"
END_OBJECT           = TEXT
END


Miscellaneous
=============

     An operator error resulted in no good engineering or monitor data from
98/028.  We have resubmitted the query and will report results tomorow.


Engineering Data
================

     No new data.


Open Loop Data
==============

  Data Collection
  ---------------

     The following is based on a report from Trish Priest:

Occultation #6 went smoothly.  This measurement was over DSS-15.  Once
again, RS-generated predicts were used; we have now loaded RS-generated
predicts into the DSP at all three complexes.  The signal strength appears
to be between 40 and 45 dB above the noise on the SSI display.  There were
no apparent problems.  The DSP was set in the standard configuration.

Record Time:  028-23:18:00 to 028-23:33:00
One-way w/ TLM off:  028-23:18:18 to 028-23:32:35
Expected Surface Begin:  028-23:30:35

The automatic transfer of data between the CDR and the TDS should be
functioning again.

     At Stanford we have obtained the following Mars radio occultation open
loop data from the NERT Cache.

YYYY/DDD DSS        DSP        SAMP  BW   DSP  BIT  TRK  REC  RECS RECS  SNR
               START    STOP   RATE      MODE RESN MODE  LEN       MSSG
-------- --- -------- -------- ---- ---- ---- ---- ---- ---- ----- ---- -----
1998/028  15 23:18:18 23:33:00 5000 2000   2   12   1-W 1666  4411    0   50.

  Anomalies
  ---------

     DSP buffering problems on 98/024 caused loss of records, as was noted in
previous reports (e.g., HEA8028A.TXT).  Closer examination of the data shows
that the samples which WERE obtained do not have the correct time tags.
Although it might be possible to re-establish synchronism, we feel the return
from expending effort to do so would be minimal.  There was no surface
occultation and there are no indications that surface echoes were captured.
We consider these data to be "lost," but the impact is zero.

     Data from the 1998/028 de facto USO Test and occultation have not yet
reached the NERT Cache.

  Analysis
  --------

     Closer examination of power vs time profiles on the first two surface
occultations shows irregular increases and decreases before the geometrical
occultation.  The plot from 98/027 is included here as Figure HEA8029A.PS1.
We assume that the amplitude structure results from multi-path (or limb
topography) as the raypath intercepted the surface at a very oblique angle.
But we have not attempted a detailed analysis to confirm either hypothesis.


Closed Loop Data
================

  Data Collection
  ---------------

     We have obtained the following files from OSCAR and EPIC:

                Original File Name              Name on SOPC
                ------------------------------  ------------
       ODF:     98028O029.DAT;1                 8028029A.ODF
                98029O029.DAT;1                 8029029A.ODF
                9802901209.DAT;1                8029029B.ODF


Ancillary Data
==============

  Data Collection
  ---------------

     We have obtained the following files from the CDB:

                Original File Name              Name on SOPC
                ------------------------------  ------------
       AMD:     amdgen.P109.out                 8028028B.AMD
       OPT:     optg_i_980128_OD109_119_V1      8028037A.OPT
       SAK:     mgs_solar_array_1998-028.ck     8028028A.SAK
       SFO:     p110b.00.sfos                   8029031A.SFO
       SFO:     p110b.01.sfos                   8029031B.SFO
       SFO:     p110c.00.sfos                   8029031C.SFO
       SFO:     p110c.01.sfos                   8029031D.SFO
       SFO:     p110d.00.sfos                   8029031E.SFO
       SFO:     p110d.01.sfos                   8029031F.SFO
       SFO:     p110e.00.sfos                   8029031G.SFO
       SFO:     p110e.01.sfos                   8029031H.SFO
       SOE:     p110b.00.soe                    8029030A.SOE
       SOE:     p110b.01.soe                    8029030B.SOE
       SOE:     p110c.00.soe                    8029031A.SOE
       SOE:     p110c.01.soe                    8029031B.SOE
       SOE:     p110d.00.soe                    8029031C.SOE
       SOE:     p110d.01.soe                    8029031D.SOE
       SOE:     p110e.00.soe                    8029031E.SOE
       SOE:     p110e.01.soe                    8029031F.SOE
       SPK:     spk_i_980128_OD109_119_V1       8028037A.SPK
       TCK:     mgs_spice_c_kernel_1998-028.ck  8028028A.TCK


Figure Captions
===============

     HEA8029A.PS1:  Power in raw samples vs time at the grazing occultation
on 98/027.  Structure prior to the occultation may result from multipath or
limb topography.


Figures
=======

     Plot(s) illustrate some of the points made in the text.  Each plot is
a PostScript file, created and printable on our SOPC.  For report text file
HEAydddC.TXT  Figure N will be labeled  HEAydddC.PSN  and sent as the N+1st
e-mail message of a set.  We assume that you can strip off the e-mail headers
and either display or print copies of the figures on a machine in your area.
People who have indicated that they cannot handle these files by e-mail are
not included in the e-mail distribution of figures.