Tektronix TG8000 User Manual page 282

GPS7 GPS Synchronization and Timecode module
3–132
ACQUIRE POSITION. Press the ENTER button to erase the saved position, and
then acquire and save a new averaged position. Note that the signal quality might
indicate low or no signal during this process.
NOTE.
The module must make 60, 1 second GPS readings with at least four
satellites to acquire the position. How long this takes depends on various
conditions. If there are less than four satellites, a reading cannot be taken.
GPS CONSTELLATION. This menu selection appears only for GPS7 modules
with a GPS/GLONASS receiver that are installed in a TG8000 with firmware
version 1.6 or later.
Use the left (◄) or right (►) arrow button to select GPS Only, GLONASS Only,
or GPS & GLONASS.
NOTE.
After you configure the GPS constellation, it is strongly recommended that
you save the module settings to the Power On Default preset. The Power On
Default preset saves the configuration parameters in both the TG8000 mainframe
and the installed modules, which helps the instrument power up faster in the event
of a power outage or interruption. (See page 3-112, Save the module settings as
the Power On Default preset.)
Earlier versions of the GPS7 module included a receiver that could use only GPS
signals. Later versions of the module include a receiver that can use GPS and/or
GLONASS signals. (See page 3-102, How to determine which GPS receiver is
installed in your GPS7 module.)
SIGNAL WARNING. This function provides a warning that the antenna signal
has degraded. Set this level below the normal range experienced as a function
of time of day, weather, or other variables. To configure the output warning, see
the GPO submenu. (See page 3-151, GPS7 module GPO submenu.) Use the left
(◄) or right (►) arrow button to select the FOM (quality of the GPS/GLONASS
signal) value that will trigger warning indicators. (See page 3-105, Figures of
Merit (FOM).)
TG8000 Multiformat Test Signal Generator User Manual