Safran VersaSync - Troubleshooting GNSS Reception; Troubleshooting - 1 PPS, 10 Mhz Outputs

5.1.5 Troubleshooting GNSS Reception
If VersaSync reports GPS, Holdover, and/or Time Sync Alarms caused by insuf-
ficient GNSS reception:
When a GNSS receiver is installed in VersaSync, a GNSS antenna can be con-
nected to the rear panel antenna connector via a coax cable to allow it to track
several satellites in order for GNSS to be an available input reference. Many
factors can prevent the ability for the GNSS receiver to be able to track the min-
imum number of satellites.
With the GNSS antenna installed outdoors, with a good view of the sky (the view
of the sky is not being blocked by obstructions), VersaSync will typically track
between 5-10 satellites (the maximum possible is 12 satellites). If the antenna’s
view of the sky is hindered, or if there is a problem with the GNSS antenna install-
ation, the GNSS receiver may only be able to a few satellites or may not be able
to track any satellites at all.
When GNSS is a configured time or 1PPS input reference, if the GNSS receiver is
unable to continuously track at least four satellites (until the initial GNSS survey
has been completed) or at least one satellite thereafter, the GNSS signal will not
be considered valid. If no other inputs are enabled and available, VersaSync may
not initially be able to go into time sync. Or, if GNSS reception is subsequently
lost after initially achieving time sync, VersaSync will go into the Holdover mode.
If GNSS reception is not restored before the Holdover period expires (and no
other input references become available) VersaSync will go out of sync. The
GNSS reception issue needs to be troubleshot in order to regain time sync.
For additional information on troubleshooting GNSS reception issues with Ver-
saSync, please refer to the GNSS Reception Troubleshooting Guide, available
here on the Safran website.
5.1.6 Troubleshooting – 1PPS, 10 MHz Outputs
If the 1PPS and/or the 10MHz output(s) are not present, input power may not be
applied. Or VersaSync is not synchronized to its input references and Signature
Control is enabled.
VersaSync User Manual 309
APPENDIX