FTS Report on DOY 169

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

55355  159     -0.138     0.071    -1.920     0.208    -1.781
55356  160     -0.138     0.042    -1.930     0.178    -1.791
55357  161     -0.137     0.018    -1.941     0.153    -1.803
55358  162     -0.135    -0.022    -1.951     0.111    -1.815
55359  163     -0.130    -0.041    -1.966     0.087    -1.835
55360  164     -0.124    -0.067    -1.974     0.055    -1.850
55361  165     -0.119    -0.093    -1.984     0.024    -1.865
55362  166     -0.114    -0.120    -1.993#   -0.007    -1.878#
55363  167     -0.111    -0.145    -2.003    -0.036    -1.893
55364  168     -0.106    -0.171    -2.008    -0.067    -1.901
55365  169     -0.103*   -0.200*   -2.023*   -0.098*   -1.919*
55366  170     -0.100*   -0.227*   -2.033*   -0.129*   -1.933*
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 55355 to 55364
 -----------------------------------------------------------------------
|                                 | DELTA-F/F | UNCERTAINTY | STD. DEV. |
|           MEASUREMENT           |  (E-13)   | (+/- E-13)  |  (nsec.)  |
|---------------------------------|-----------|-------------|-----------|
|   SPC10 RELATIVE TO UTC(NIST)   |    0.455  |    0.029    |   2.280   |
|   SPC40 RELATIVE TO UTC(NIST)   |   -3.091  |    0.049    |   3.775   |
|   SPC60 RELATIVE TO UTC(NIST)   |   -1.171  |    0.029    |   2.258   |
|   SPC40 RELATIVE TO SPC10       |   -3.552  |    0.035    |   2.723   |
|   SPC60 RELATIVE TO SPC10       |   -1.636  |    0.035    |   2.758   |
 -----------------------------------------------------------------------

III.
Comments: * Values derived from linear least squares extrapolation or interpolation.
# Station wide power glitch caused the SPC 60 FTS receiver to fail between DOY 166/1718 UTC (MJD 55362) to DOY 167/1900 UTC (55363), when it was discovered and reset. 

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. 
The problem is being worked. It could take up to a month to find out the solution. The new set of receivers are in the process of being sent to replace the old ones.
Those will be brought back to be recalibrated.

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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