FTS Report on DOY 175

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

56457  165     -1.791     0.356    -0.733     2.148     1.062
56458  166     -1.810     0.349    -0.756     2.159     1.058
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     -0.168*    0.279*   -0.780*    0.445*   -0.604*
56468  176     -0.144*    0.271*   -0.756*    0.413*   -0.601*
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 56457 to 56466
 -----------------------------------------------------------------------
|                                 | DELTA-F/F | UNCERTAINTY | STD. DEV. |
|           MEASUREMENT           |  (E-13)   | (+/- E-13)  |  (nsec.)  |
|---------------------------------|-----------|-------------|-----------|
|   SPC10 RELATIVE TO UTC(USNO)   |    2.773^ |    0.147^   |   3.802^  |
|   SPC40 RELATIVE TO UTC(USNO)   |   -0.903  |    0.080    |   2.063   |
|   SPC60 RELATIVE TO UTC(USNO)   |    2.789$ |    0.033$   |   0.866$  |
|   SPC40 RELATIVE TO SPC10       |   -3.808^ |    0.110^   |   2.855^  |
|   SPC60 RELATIVE TO SPC10       |    0.359$ |    0.013$   |   0.346$  |
 -----------------------------------------------------------------------

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 56466.
% 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 56466.

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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