FTS Report on DOY 281

I.  The following are clock offsets, in microseconds between the clocks
at each DSN complex and each complex relative to UTC(NIST).  The offset
is a mean of readings using several GPS space vehicles in common view.

                SPC10     SPC40     SPC60     SPC40     SPC60
                MINUS     MINUS     MINUS     MINUS     MINUS
 MJD   DOY      NIST      NIST      NIST      SPC10     SPC10

55467  271      0.866    -2.716    -2.763    -3.585    -3.629
55468  272      0.894    -0.031%   -2.768    -0.927%   -3.661
55469  273      0.920     0.005$   -2.774    -0.916$   -3.693
55470  274      0.945    -0.010    -2.779    -0.957    -3.723
55471  275      0.969    -0.013    -2.784    -0.984    -3.753
55472  276      0.994    -0.017    -2.789    -1.013    -3.782
55473  277      1.018    -0.022    -2.794    -1.042    -3.812
55474  278      1.041    -0.029    -2.799    -1.071    -3.840
55475  279      1.032#   -0.035    -2.804    -1.069#   -3.837#
55476  280      1.004    -0.038    -2.809    -1.043    -3.814
55477  281      1.070*   -0.045*   -2.814*   -1.105*   -3.885*
55478  282      1.089*   -0.051*   -2.819*   -1.126*   -3.909*
Values derived from linear least squares extrapolation or interpolation are indicated by (*) next to the time offset. 

II.  Frequency Offsets from linear least-squares fits on time-offsets over the period from 55467 to 55476
 -----------------------------------------------------------------------
|                                 | DELTA-F/F | UNCERTAINTY | STD. DEV. |
|           MEASUREMENT           |  (E-13)   | (+/- E-13)  |  (nsec.)  |
|---------------------------------|-----------|-------------|-----------|
|   SPC10 RELATIVE TO UTC(NIST)   |    2.146  |    0.280    |  21.749   |
|   SPC40 RELATIVE TO UTC(NIST)   |   -0.662  |    0.035    |   2.715   |
|   SPC60 RELATIVE TO UTC(NIST)   |   -0.589  |    0.004    |   0.314   |
|   SPC40 RELATIVE TO SPC10       |   -2.403  |    0.291    |  22.655   |
|   SPC60 RELATIVE TO SPC10       |   -2.757  |    0.278    |  21.628   |
 -----------------------------------------------------------------------

III.
Comments: * Values derived from linear least squares extrapolation or interpolation.

% On DOY 272 (MJD 55468), the new Hydrogen Maser, Symmetricom, has been put online at SPC 40 following a global power downtime at the site.  
# On DOY 278/2100 UTC (MJD 55474), SPC 10 frequency standard was adjusted by 6*E-13 seconds. 

On DOY 167, it was discovered that the new FTS receivers have been incorrectly calibrated. The time offset could be off by up to 40 to 50 nanoseconds. 
SPC 10 receiver has been recalibrated remotely on DOY 176 (MJD 55372). The time offset was adjusted by 43 nanoseconds. 
$ SPC 40 receiver has been recalibrated on DOY 273 (MJD 55469). The time offset was adjusted by 44.9 nanoseconds.
SPC 60 receiver will be recalibrated later. 

NOTES: All DSN data are from the new multichannel receivers.
SPC 10 and SPC 60 offsets are commonviewed with NIST and with each other.
SPC 40 offsets are all-in-viewed with NIST and with SPC 10. 

FTS Contacts: Connie Dang (626)305-6194 :: Linh La (626)305-6184



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