GPS7 GPS Synchronization and Timecode modu le
GPS RCVR. The GP
S/GLONASS signal can be selected as the source for a time
of day clock used for timecode outputs, and as a phase reference for video outputs.
The GPS/GLONASS signal carries the time represented as the number of weeks
and number of seconds since the GPS Epoch (0:00:00 UTC, January 6 1980).
For example, 12:00:00 UTC on November 5, 2008 is represented as 1504 weeks
plus 302,400 seconds. An additional 14 leap seconds that have passed between
January 1980 and November 2008 are also signalled i n messages from the
GPS/GLONASS satellite systems.
NOTE. Sinc
e N ovember 2008, an additional 2 leap seconds have been added and
are also signalled in messages from the GPS/GLONASS satellite systems.
Interna
lTimeSet*. If you want to set Time Setup to internal mode, enter the
current date and time and then set the Time Setup to Internal in order to transfer
that time to the Master Time. The time zoneoffsetandleapsecondinformationis
used to convert local time to a master time that is equivalent to GPS/GLONASS
time. Set the local time zone offset b efore setting the internal time.
VITC R
eader. When the GPS7 is genlocked to NTSC or PAL, the Vertical Interval
Timecode on the genlock reference input can be decoded and used as the time
source. This time can be viewed on the status bar, a nd is used as the time source
for all the time code outputs. Since the phase of the video signals are set by the
genlock, the epoch system does not operate from the VITC input. If SMPTE309
date data is available, the time and date information on the VITC input will be
use
d if enabled in the TIME OF DAY submenu. (See page 3-133, GPS7 module
TIME OF DAY submenu.)
LTC Reader. When the GPS7 reference source is set to INTERNAL, NTSC, PAL
or HD SYNC, the LTC signal applied to the LTC 1 input can be used at the time
source. This time can be viewed on the statusbarandisusedasatimesource
f
or all the time code outputs. If SMPTE309 date data is available, the time and
date information on the LTC input will be used if enabled in the TIME OF DAY
submenu. (See page 3-133, GPS7 module TIME OF DAY submenu .)
Time Setup Selection. The possible Time code sources depend on the selected
Reference source. If GPS signal is the selected reference source, then GPS or
internal time is available. If Genlock is the selec ted reference source, then VITC,
LTC, or internal time is available. If Internal is the selected reference source, then
internal time is the time code source.
If VITC or LTC is the time code source, then the time s ynchronization mode needs
to be set. There are three choices. Synchronize now sets the time when the user
presses the ENTER button (if the incoming time is valid and stable). Synchronize
once sets the time once when a valid and stable time code is detected. Follow sets
the time every time a new stable and valid time is detected.
3–108 TG8000 Multiformat Test Signal Generator User Manual
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