FTS Report on DOY 291

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

55477  281      0.977    -0.042    -2.814    -1.020    -3.792
55478  282      0.951    -0.047    -2.817    -1.000    -3.768
55479  283      0.927    -0.053    -2.822    -0.981    -3.749
55480  284      0.901    -0.058    -2.822    -0.960    -3.723
55481  285      0.874    -0.066    -2.829    -0.942    -3.704
55482  286      0.847    -0.071    -2.832    -0.921    -3.680
55483  287      0.822    -0.077    -2.836    -0.901    -3.658
55484  288      0.798    -0.084    -2.840    -0.884    -3.639
55485  289      0.773    -0.090    -2.844    -0.865    -3.618
55486  290      0.746    -0.097    -2.848    -0.845    -3.594
55487  291      0.721*   -0.103*   -2.852*   -0.825*   -3.573*
55488  292      0.695*   -0.109*   -2.856*   -0.806*   -3.551*
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 55477 to 55486
 -----------------------------------------------------------------------
|                                 | DELTA-F/F | UNCERTAINTY | STD. DEV. |
|           MEASUREMENT           |  (E-13)   | (+/- E-13)  |  (nsec.)  |
|---------------------------------|-----------|-------------|-----------|
|   SPC10 RELATIVE TO UTC(NIST)   |   -2.966  |    0.011    |   0.838   |
|   SPC40 RELATIVE TO UTC(NIST)   |   -0.716  |    0.011    |   0.888   |
|   SPC60 RELATIVE TO UTC(NIST)   |   -0.446  |    0.013    |   1.027   |
|   SPC40 RELATIVE TO SPC10       |    2.250  |    0.014    |   1.085   |
|   SPC60 RELATIVE TO SPC10       |    2.527  |    0.019    |   1.446   |
 -----------------------------------------------------------------------

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

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. 
On DOY 176 (MJD 55372), SPC 10 receiver was re-calibrated remotely. The time offset was adjusted by 43 nanoseconds. 
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 273 (MJD 55469), SPC 40 receiver has been recalibrated. 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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