PDS_VERSION_ID               = PDS3
RECORD_TYPE                  = STREAM
STANDARD_DATA_PRODUCT_ID     = HEA
DATA_SET_ID                  =  "MEX-M-MRS-1/2/3-PRM-0475-V1.0"
PRODUCT_ID                   = "M00SUE0L1A_HEA_052180915_00.TXT"
PRODUCT_CREATION_TIME        =  2007-08-29T13:45:47.000
PRODUCER_ID                  = "SUE"
INSTRUMENT_HOST_ID           = "MEX"
OBJECT                       = TEXT
PUBLICATION_DATE               = 2005-08-08
NOTE                           = "DSN MEX Data Collection: Days 218-219"
END_OBJECT                   = TEXT
END


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

     This is the first report since HEA5218A.TXT.

     The next scheduled occultation observation at a DSN antenna is on
day 225 at DSS 14.


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

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

     We have completed quick-look processing on the following MEX RSR open
loop data at Stanford:

DOY DSS        RSR        BAND RSR CH KSPS BT  REC   RECS      RSR      MAX
          START    STOP         ID         RS  LEN          FILE NAME   SNR
--- --- -------- -------- ---- --- -- ---- -- ----- ----- ------------ -----
218  63 09:15:00 09:30:00 X/XR   4  1    2 16  8260   901 5218091A.RSR  63.6
218  63 09:15:00 09:30:00 X/SR   3  1    2 16  8260   901 5218091B.RSR  49.7
219  63 05:25:00 05:40:00 X/XR   4  1    2 16  8260   901 5219052A.RSR  64.1
219  63 05:25:00 05:40:00 X/SR   3  1    2 16  8260   901 5219052B.RSR  51.4
219  15 12:09:00 12:24:00 X/XR   6  1    2 16  8260   901 5219120A.RSR  59.6
219  15 12:09:00 12:24:00 X/SR   5  1    2 16  8260   901 5219120B.RSR  42.8

  Anomalies
  ---------

     Data collected at DSS 63 were clipped; the X-RCP data on day 219 are
seriously degraded.  Tentative diagnosis is that 34-m values for FGAIN were
used for 70-m operations; but that does not explain the difference between
days 218 and 219 at DSS 63.  There was 3 dB difference in the RSR attenuator
settings between the two days.  It's possible that there was also a difference
in modulation state between the two days.  The Pt/No observed during bistatic
radar on day 205 (unmodulated carriers) was 72 and 52 dB/Hx at X- and S-bands,
respectively.

      DOY  Band DSS  RSR Attenuator   RSR FGAIN Setting   Observed Pt/No
                         (dB)             (dB/Hz)           (dB/Hz)
      --- ----- ---  --------------   -----------------   --------------
      218 X-RCP  63        27                 65                 64*
      218 S-RCP  63        28                 50                 50*
      219 X-RCP  63        24                 65                 64*
      219 S-RCP  63        26                 50                 51*
      219 X-RCP  15        19                 65                 60
      219 S-RCP  15        19                 50                 43

       * Observed Pt/No will tend to be low when the signal is clipped

     Best MEX performance appears to be achieved when FGAIN is about 3 dB
higher than the actual Pt/No.  When the spacecraft modulation state is
unknown, unmodulated should be assumed.  So the recommended default FGAIN
for MEX at DSS 63 is 75 on X-band and 55 on S-band.  The recommended default
values at DSS 15 are 69 and 49, respectively.