FTS Report on DOY 181

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

55367  171     -0.090    -0.248    -2.044    -0.159    -1.954
55368  172     -0.085    -0.271    -2.053    -0.188    -1.969
55369  173     -0.080    -0.292    -2.064    -0.214    -1.983
55370  174     -0.073    -0.315    -2.074    -0.244    -2.000
55371  175     -0.069    -0.336    -2.086    -0.269    -2.017
55372  176     -0.107$   -0.356    -2.095    -0.252$   -2.008$@
55373  177     -0.102    -0.379    -2.111    -0.279    -2.013
55374  178     -0.097    -0.400    -2.116    -0.304    -2.019
55375  179     -0.092    -0.423    -2.126    -0.332    -2.034
55376  180     -0.087    -0.446    -2.136    -0.361    -2.049
55377  181     -0.082*   -0.466*   -2.148*   -0.387*   -2.055*
55378  182     -0.077*   -0.488*   -2.158*   -0.414*   -2.065*
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 55367 to 55376
 -----------------------------------------------------------------------
|                                 | DELTA-F/F | UNCERTAINTY | STD. DEV. |
|           MEASUREMENT           |  (E-13)   | (+/- E-13)  |  (nsec.)  |
|---------------------------------|-----------|-------------|-----------|
|   SPC10 RELATIVE TO UTC(NIST)   |    0.564  |    0.007    |   0.225   |
|   SPC40 RELATIVE TO UTC(NIST)   |   -2.523  |    0.028    |   0.952   |
|   SPC60 RELATIVE TO UTC(NIST)   |   -1.203  |    0.052    |   1.788   |
|   SPC40 RELATIVE TO SPC10       |   -3.152  |    0.026    |   0.890   |
|   SPC60 RELATIVE TO SPC10       |   -1.183  |    0.116    |   4.005   |
 -----------------------------------------------------------------------

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. 
$ 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 receiver will be recalibrated later.
@ Complex wide power outage at SPC 60 on DOY 176 (MJD 55372) caused a data loss of almost two days, all of MJD 55372 and most of MJD 55373. 
The receiver came back up at DOY 177/2314 UTC. Data for MJD 55372 was derived at using backward extrapolation from MJDs 55373 and 55374.

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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