FTS Report on DOY 024

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

55575  014     -0.754    -0.992    -2.980    -0.240    -2.228
55576  015     -0.761    -0.986    -2.980    -0.228    -2.220
55577  016     -0.769    -0.980    -2.979    -0.213    -2.211
55578  017     -0.777    -0.973    -2.978    -0.199    -2.203
55579  018     -0.786    -0.967    -2.977    -0.183    -2.191
55580  019     -0.795    -0.961    -2.980$   -0.168    -2.186$
55581  020     -0.803    -0.956    -2.987    -0.155    -2.183
55582  021     -0.808    -0.949    -2.985    -0.144    -2.178
55583  022     -0.812    -0.944    -2.983    -0.134    -2.172
55584  023     -0.818    -0.942    -2.983    -0.127    -2.166
55585  024     -0.829*   -0.933*   -2.985*   -0.107*   -2.156*
55586  025     -0.836*   -0.927*   -2.985*   -0.093*   -2.149*
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 55575 to 55584
 -----------------------------------------------------------------------
|                                 | DELTA-F/F | UNCERTAINTY | STD. DEV. |
|           MEASUREMENT           |  (E-13)   | (+/- E-13)  |  (nsec.)  |
|---------------------------------|-----------|-------------|-----------|
|   SPC10 RELATIVE TO UTC(NIST)   |   -0.853  |    0.031    |   2.430   |
|   SPC40 RELATIVE TO UTC(NIST)   |    0.674  |    0.016    |   1.276   |
|   SPC60 RELATIVE TO UTC(NIST)   |   -0.074  |    0.034    |   2.637   |
|   SPC40 RELATIVE TO SPC10       |    1.526  |    0.046    |   3.567   |
|   SPC60 RELATIVE TO SPC10       |    0.792  |    0.042    |   3.233   |
 -----------------------------------------------------------------------

III.
Comments: 
$ SPC 60 GPS receiver B was set up on DOY 019 (MJD 55580). Cause for the time step was unknow. 

On DOY 167 (MJD 55363), 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 273 (MJD 55469), SPC 40 FTS receiver has been recalibrated. The time offset was adjusted by 44.9 nanoseconds.
SPC 60 receiver will be recalibrated later. 
On DOY 357 (MJD 55553), SPC 40 HM2 (the new Symmetricom Maser) was put online. 

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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