FTS Report on DOY 073

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

55624  063     -0.896    -0.968    -2.940    -0.074    -2.046
55625  064     -0.897    -0.973    -2.917    -0.079    -2.022
55626  065     -0.896    -0.977    -2.892    -0.084    -1.999
55627  066     -0.897    -0.986    -2.872    -0.091    -1.976
55628  067     -0.897    -0.990    -2.846    -0.095    -1.952
55629  068     -0.897    -0.997$   -2.824    -0.103$   -1.929
55630  069     -0.897    -1.007    -2.805    -0.113    -1.910
55631  070     -0.895    -0.997    -2.782    -0.105    -1.891
55632  071     -0.898    -0.969    -2.763    -0.074    -1.868
55633  072     -0.896    -0.940    -2.738    -0.046    -1.844
55634  073     -0.896*   -0.921*   -2.716*   -0.027*   -1.821*
55635  074     -0.896*   -0.898*   -2.693*   -0.004*   -1.799*
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 55624 to 55633
 -----------------------------------------------------------------------
|                                 | DELTA-F/F | UNCERTAINTY | STD. DEV. |
|           MEASUREMENT           |  (E-13)   | (+/- E-13)  |  (nsec.)  |
|---------------------------------|-----------|-------------|-----------|
|   SPC10 RELATIVE TO UTC(NIST)   |    0.003  |    0.010    |   0.779   |
|   SPC40 RELATIVE TO UTC(NIST)   |    2.653  |    0.074    |   5.777   |
|   SPC60 RELATIVE TO UTC(NIST)   |    2.573  |    0.025    |   1.939   |
|   SPC40 RELATIVE TO SPC10       |    2.683  |    0.087    |   6.754   |
|   SPC60 RELATIVE TO SPC10       |    2.572  |    0.027    |   2.133   |
 -----------------------------------------------------------------------

III.
Comments: 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 receiver was re-calibrated. The time offset was adjusted by 44.9 nanoseconds.  
On DOY 053 (MJD 55614), SPC 60 receiver was re-calibrated. Time offset was adjusted by 67.88 nanoseconds.  
On DOY 357 (MJD 55553), SPC 40 HM2 (the new Symmetricom Maser) was put online.  
On DOY 060 (MJD 55621), SPC 60 HM263 (Symmetricom) was put online.
$ On DOY 068 (MJD 55629), SPC 40 online HM2 frequency was adjusted by 4*E-13 seconds.


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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