User's Manual Part 2

CL1TC-4 400W DVB-H Transmitter Alarms
Product Manual, Rev. 1 134
10.6 High Power Amplifier (HPA) Alarms and Warnings
Wh
en a critical alarm occurs (except for thermal shutdown) the HPA will wait several
seconds then try to re-start. If the critical alarm causes the HPA to shutdown again, the
procedure will be repeated. After three repeated failures, within approximately 50 seconds,
the HPA will stay in shutdown mode. In this case, the amplifier will remain in this state until
the alarms are cleared and the user issues a command to place the transmitter in broadcast
mode.
10.6.1 HPA Controller Comm Err
HPA Co
ntroller Comm Err - set when communication between the modulator and HPA
controller has failed.
NOTE: The Alarm Properties settings in the Web-GUI for this alarm should be set such that
the transmitter output is muted as a result. Transmission is restored when the alarm is
cleared.
10.6.2 RF Switch Fault
RF Swi
tch Fault - set when one of the following alarms occurs:
• HPA Forward Power Err
• HPA Reflected Power Err
• HPA Input Err
NOTE: When a RF Switch Fault has occurred, the amplifier RF will be turned OFF, instead of
a complete shutdown. After several seconds, the internal controller will turn the RF ON
again. After three repeated failures, within approximately 50 seconds, the RF will be turned
OFF. User intervention will be required to turn the RF back on. The Web-GUI interface has
no control over this action.
10.6.3 HPA Forward Power Warning
Note: HPA
Forward Power Warning is not implemented at this point in time.
10.6.4 HPA Forward Power Err
HPA Forwar
d Power Err (Critical)
58.5 dBm
HPA Forward Power Err – set when the forward (output) power reaches 58.5 dBm.
NOTE: Automatic HPA shutdown is initiated by the HPA when the critical level is reached
and a RF Switch Fault alarm is raised. The Web-GUI interface has no control over this
action.