GPS7 GPS Synchronization and Timecode modu le
Warning: Indic
ates that the timing is near the threshold between frames. The
time code may be assigned to the adjacent video frame, or may shift one
frame if the timing changes slightly.
If the LTC timing is slewing, it indicates that the LTC and the selected
reference (Internal, GPS, or Video Genlock) are not synchronous. In this
case, the time code will shift when it crosses the threshold from one frame
to another. This can be avoided by not using the “follow” mode for the time
synchronization. Instead, use the “Synchronize Once” or “Synchronize now”
modes.
LTC time display and status
LTC signal amplitude and status
Time of day and the reference source
UTC, local, and internal time displays
Program time counter
Applie
dDSToffset
GPS/GLONASS signal quality and the number of satellites detected versus
satel
lites usable
NOTE. Signal quality is an indicator of how well the GPS/GLONASS signal is
being received. It is a sum of the correlation for each of the satellites. It can be
used to evaluate the antenna and connecting cable, but it can take a while for the
receivers to recognize which satellites are available and stabilize at the final level.
Antenna power status: Power OFF, Open, Short,orNominal.
NOTE. A shorted GPS/GLONASS antenna will not damage the GPS7 module. If a
splitter is used on the antenna, it may appear as a short at DC but will still pass
t
hrough the RF signal, which will allow the GPS to function.
The status will read Open if no antenna is connected or if the current load is less
than expected because a splitter or DC block is being used.
REFERENCE. Selects the timing reference and the response for a loss of lock to
the timing reference. Select this menu item, and then press the ENTER button to
access the REFERENCE submenu. (See page 3-118.)
3–116 TG8000 Multiformat Test Signal Generator User Manual
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