Diagnostics
RFI-148 250W VHF Paging Transmitter User Manual
Page 21 of 43
5.
Diagnostics
5.1 Status Monitoring
The paging transmitter has a number of sensors which are continuously monitored. The sensors are used to
monitor:
Internal voltage and current levels.
Ambient and transmitter temperature.
Fan operation.
Transmitted and reflected power.
Each sensor has configurable upper and lower cut-offs that will cause a fault when exceeded. For example, if
the driver temperature upper cut-off is exceeded, the high driver temperature fault will be set active.
For a full list of sensors monitored by the transmitter and their tracked units and value range see Appendix
E.
5.1.1 Conditional Cut-off Checking
Some sensors are only compared against their upper and lower cut-offs under certain conditions, such as
when the transmitter is on. The following sensors have conditional cut-off checking:
During transmission:
Exciter current.
PA current.
Driver current.
Reverse power.
Transmit power.
Driver power.
Exciter power.
Isolator VSWR.
While the fans are turned on to full speed:
Fan 1 and 2 current.
Fan 1 and 2 RPM.
A sensor that falls outside its cut-offs while its checking condition is met will cause the respective fault to
become active. The fault will only be cleared once it has returned to within its cut-offs while its checking
condition is met.
