FTS Report on DOY 354

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

55540  344     -0.324    -1.386    -2.978    -1.064    -2.655
55541  345     -0.338    -1.366    -2.976    -1.031    -2.640
55542  346     -0.355    -1.358    -2.980    -1.005    -2.627
55543  347     -0.368    -1.337    -2.978    -0.971    -2.612
55544  348     -0.383    -1.327    -2.981    -0.946    -2.598
55545  349     -0.398    -1.313    -2.981    -0.917    -2.585
55546  350     -0.414    -1.293    -2.982    -0.882    -2.570
55547  351     -0.426    -1.276    -2.984    -0.853    -2.560
55548  352     -0.441    -1.263    -2.985    -0.825    -2.547
55549  353     -0.456    -1.251    -2.986    -0.798    -2.531
55550  354     -0.471*   -1.234*   -2.987*   -0.766*   -2.518*
55551  355     -0.486*   -1.219*   -2.988*   -0.736*   -2.504*
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 55540 to 55549
 -----------------------------------------------------------------------
|                                 | DELTA-F/F | UNCERTAINTY | STD. DEV. |
|           MEASUREMENT           |  (E-13)   | (+/- E-13)  |  (nsec.)  |
|---------------------------------|-----------|-------------|-----------|
|   SPC10 RELATIVE TO UTC(NIST)   |   -1.697  |    0.012    |   0.930   |
|   SPC40 RELATIVE TO UTC(NIST)   |    1.748  |    0.035    |   2.695   |
|   SPC60 RELATIVE TO UTC(NIST)   |   -0.116  |    0.014    |   1.052   |
|   SPC40 RELATIVE TO SPC10       |    3.442  |    0.029    |   2.285   |
|   SPC60 RELATIVE TO SPC10       |    1.575  |    0.017    |   1.350   |
 -----------------------------------------------------------------------

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), SPC 40 was put back on HM1 to adjust the VCO on the new Symmetricom Maser. 
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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