FTS Report on DOY 335

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

55521  325     -0.048    -0.845    -2.948    -0.800    -2.902
55522  326     -0.067    -0.882    -2.949    -0.817    -2.882
55523  327     -0.086    -0.918    -2.949    -0.835    -2.864
55524  328     -0.102    -0.955    -2.952    -0.855    -2.851
55525  329     -0.120    -0.990    -2.953    -0.873    -2.834
55526  330     -0.135    -1.025    -2.954    -0.894    -2.821
55527  331     -0.149    -1.057    -2.956    -0.912    -2.809
55528  332     -0.162    -1.089    -2.958    -0.930    -2.798
55529  333     -0.178    -1.123    -2.961    -0.947    -2.784
55530  334     -0.193    -1.157    -2.963    -0.967    -2.772
55531  335     -0.211*   -1.194*   -2.964*   -0.985*   -2.754*
55532  336     -0.227*   -1.229*   -2.965*   -1.004*   -2.740*
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 55521 to 55530
 -----------------------------------------------------------------------
|                                 | DELTA-F/F | UNCERTAINTY | STD. DEV. |
|           MEASUREMENT           |  (E-13)   | (+/- E-13)  |  (nsec.)  |
|---------------------------------|-----------|-------------|-----------|
|   SPC10 RELATIVE TO UTC(NIST)   |   -1.837  |    0.034    |   2.632   |
|   SPC40 RELATIVE TO UTC(NIST)   |   -3.995  |    0.033    |   2.547   |
|   SPC60 RELATIVE TO UTC(NIST)   |   -0.197  |    0.010    |   0.764   |
|   SPC40 RELATIVE TO SPC10       |   -2.155  |    0.011    |   0.843   |
|   SPC60 RELATIVE TO SPC10       |    1.633  |    0.046    |   3.595   |
 -----------------------------------------------------------------------

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 299 (MJD 55495), Hydrogen Maser #1 has been put back online at SPC 40 to adjust HM2's VCO. 
On DOY 273 (MJD 55469), SPC 40 GPS 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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