User Manual

RF-Orchestra!™ Transmitter Installation and Operation Operation
July 2000 6880493G02-C 5-37
CutbackAmount (in dB) = Param3003 * ((CurrentAmbTemp – Param3001)/(Param3002 – Param3001))
CutbackAmount = 3.0dB* (50-45)/(60-45)
CutbackAmount = 3.0dB* (50-45)/(60-45)
CutbackAmount = 1.0 dB, when the Ambient Temperature is +50.
When the Ambient Temperature is less than Param3001, there is no cutback. When it is greater
than Param3002, the transmitter is shutdown (disabled).
It is important to note that there are many different causes for the station to Cutback or
Shutdown. Use the Station Status FIPS command (a83) to determine the cause of any cutback
or shutdown. If several cutbacks are active, the highest cutback amount will take precedent. If
any shutdowns/disables are active, the transmitter will be disabled, regardless of any
cutbacks that may be active.
High Ambient Temperature Alarms/Error Logs
The following errors and alarms are associated with the High Ambient Temperature Cutback
and Shutdowns. See Appendix F, for full details.
• A 104 Error Log Entries
E_HIGH_AMBIENT_TEMP_SHUTDOWN_ALARM
E_HIGH_AMBIENT_TEMP_CUTBACK_ALARM
• A 99 Alarm Log Entries
Transmitter Disabled Due To High OCM Ambient Temperature.
Transmitter Cutback Due To High OCM Ambient Temperature.
High PA vs. Ambient Temperature Cutback/Shutdown Operation
The RF-O! transmitter takes ambient temperature sensor and PA Temperature readings every
10 seconds. The PA temperature of each installed PA is compared to the Ambient
Temperature.
If any of the PA Temperatures exceeds the Ambient Temperature by an amount greater than
the value configured by the user (Parameter 1025 – PA vs. Ambient Temp 3dB Cutback Offset),
an error is logged, an alarm is logged, and a 3 dB cutback occurs. Logging of the alarm will
also send the alarm via the RFB-RFO Maintenance Path interface to display at the
Choreographer! or MIB browser.