FTS Report on DOY 235

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

55421  225      0.445    -1.469    -2.498    -1.915    -2.941
55422  226      0.461    -1.495    -2.506    -1.958    -2.965
55423  227      0.479    -1.522    -2.513    -2.002    -2.990
55424  228      0.493    -1.548    -2.518    -2.041    -3.010
55425  229     -0.099$   -1.579    -2.527    -1.483$   -2.431$
55426  230     -0.091    -1.603    -2.534    -1.514    -2.443
55427  231     -0.077    -1.631    -2.539    -1.556    -2.462
55428  232     -0.062    -1.659    -2.546    -1.599    -2.483
55429  233     -0.043    -1.688    -2.553    -1.647    -2.510
55430  234     -0.024    -1.717    -2.559    -1.695    -2.535
55431  235     -0.012*   -1.742*   -2.567*   -1.732*   -2.551*
55432  236      0.003*   -1.770*   -2.573*   -1.775*   -2.572*
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 55421 to 55430
 -----------------------------------------------------------------------
|                                 | DELTA-F/F | UNCERTAINTY | STD. DEV. |
|           MEASUREMENT           |  (E-13)   | (+/- E-13)  |  (nsec.)  |
|---------------------------------|-----------|-------------|-----------|
|   SPC10 RELATIVE TO UTC(NIST)   |    1.767  |    0.084    |   3.629   |
|   SPC40 RELATIVE TO UTC(NIST)   |   -3.182  |    0.034    |   1.481   |
|   SPC60 RELATIVE TO UTC(NIST)   |   -0.785  |    0.019    |   0.813   |
|   SPC40 RELATIVE TO SPC10       |   -4.959  |    0.133    |   5.734   |
|   SPC60 RELATIVE TO SPC10       |   -2.440  |    0.116    |   5.002   |
 -----------------------------------------------------------------------

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

$ SPC 10 power outage at the Mars site cause a lost of LAN connection. The FTS receiver was down for about 25 hours. 
When it was restarted, there was a time shift.
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 and SPC 60 receivers 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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