Nautel VX150, Troubleshooting Manual, Page: 32 / 182

RESPONDING TO ALARMS VX150 TO VX2 TROUBLESHOOTING MANUAL
PAGE 3.1.24 VERSION 2.0 2023-04-20
Missing External 10 MHz The external 10 MHz has been enabled in the
Transmitter Settings page of the FPUI and a 10
MHz signal has not been detected on the
input for at least 1 second. The external 10 MHz has been disabled in the
Transmitter Settings page of the FPUI or a 10
MHz signal has been detected on the input for
at least 1 second. Check the connection to the external 10
MHz source.
Disable the external 10 MHz source in
the Transmitter Settings page of the FPUI
if not in use.
Missing External 1PPS The external 1PPS has been enabled by virtue
of enabling Pilot Synchronization in the
current preset and a 1PPS signal has not been
detected on the input for at least 1 second. T he external 1PPS has been disabled by virtue
of disabling Pilot Synchronization in the
current preset or a 1PPS signal has been
detected on the input for at least 1 second.
Check the connection to the external
1PPS source.
Disable the external 1PPS source by
turning off Pilot Synchronization in the
current preset if not in use.
Modulation Loss The modulation meter is less than the user
configured threshold in the active preset for a
duration exceeding the configured timeout.
The presence of this alarm can inhibit RF (see
Modulation Loss Shutback) or change presets,
if configured to do so in the active preset. This alarm will clear immediately once the
modulation meter is greater than the user
configured threshold in the active preset.
Performing an alarm reset will clear this
alarm.
The modulation loss alarm has been disabled
in the active preset. The most likely cause of this meter is loss
of audio or composite signal into the
transmitter. Check the program input
signal level and, if configured, for the
presence of any low audio alarms.
Confirm that the audio settings in the
active preset are configured correctly.
If levels and audio are as expected,
adjust the threshold or timeout for the
alarm to avoid false alarms.
Modulation Loss Shutback The modulation meter is less than the user
configured threshold in the active preset for a
duration exceeding the configured timeout.
The modulation loss alarm must be enabled
and configured to RF inhibit for this alarm to
trigger.
This alarm will inhibit the RF output until
cleared.
This alarm will clear immediately once the
modulation meter is greater than the user
configured threshold in the active preset.
Performing an alarm reset will clear this
alarm.
The most likely cause of this meter is loss
of audio or composite signal into the
transmitter. Check the program input
signal level and, if configured, for the
presence of any low audio alarms.
Alarm Name Trigger Conditions Clear Conditions Troubleshooting