FTS Report on DOY 177

I.  The following are clock offsets, in microseconds between the clocks
at each DSN complex and each complex relative to UTC(USNO).  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      USNO      USNO      USNO      SPC10     SPC10

56459  167     -1.832     0.341    -0.780     2.173     1.055
56460  168     -1.853     0.336    -0.801     2.189     1.056
56461  169     -1.878     0.324    -0.828     2.204     1.055
56462  170     -1.902#    0.314    -0.856     2.216#    1.054#
56463  171     -0.268     0.311    -0.869%    0.580    -0.594%
56464  172     -0.235     0.305    -0.852     0.540    -0.613
56465  173     -0.216     0.295    -0.830     0.511    -0.610
56466  174     -0.194     0.285    -0.804     0.480    -0.607
56467  175     -0.175     0.162@   -0.780     0.337@   -0.601
56468  176     -0.154     0.148    -0.754     0.302    -0.597
56469  177     -0.130*    0.175*   -0.731*    0.255*   -0.593*
56470  178     -0.108*    0.155*   -0.706*    0.197*   -0.589*
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 56459 to 56468
 -----------------------------------------------------------------------
|                                 | DELTA-F/F | UNCERTAINTY | STD. DEV. |
|           MEASUREMENT           |  (E-13)   | (+/- E-13)  |  (nsec.)  |
|---------------------------------|-----------|-------------|-----------|
|   SPC10 RELATIVE TO UTC(USNO)   |    2.552^ |    0.086^   |   3.713^  |
|   SPC40 RELATIVE TO UTC(USNO)   |   -2.258  |    0.840    |  36.268   |
|   SPC60 RELATIVE TO UTC(USNO)   |    2.833$ |    0.020$   |   0.858$  |
|   SPC40 RELATIVE TO SPC10       |   -6.715^ |    0.731^   |  31.597^  |
|   SPC60 RELATIVE TO SPC10       |    0.478$ |    0.020$   |   0.853$  |
 -----------------------------------------------------------------------

III.
Comments: 
# SPC 10 scheduled power outage on DOY 170 (MJD 56462) forced a time shift of about 1.5 microseconds. 
The frequency was also adjusted by 2.5*E-13 on DOY 171/1700 UTC. 
During the 12 hour period right after the power recovered, the frequency offset was inadvertently set to 1.2*E-12.
^ SPC 10 frequency offset was calculated from MJD 56463 thru 56468.
@ On DOY 175/0100 UTC, SPC 40 cable maintenance may have caused the Master Clocks to experience a time drift of about 100 nanoseconds.
% SPC 60 frequency was adjusted by 5.7*E-13 on DOY 171 (MJD 56463).
$ SPC 60 frequency offset was calculated from MJD 56464 thru 56468.


NOTES: All DSN data are from the new multichannel receivers.
SPC 10 and SPC 60 offsets are commonviewed with USNO and with each other.
SPC 40 offsets are all-in-viewed with USNO and with SPC 10. 

FTS Contacts: Connie Dang (626)305-6194 :: Linh La (626)305-6184



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