User's Manual

21
©2013 Broadcast Electronics
Fault/Alarm
Description
Foldback Alarm
power when reflected power approaches dangerous levels. This
keeps the transmitter running at reduced power in order to
prevent a reflected power fault.
Temperature Foldback
Alarm
During FM only operation, the PA attempts to lower its output
power when the internal heat sink temperature approaches
dangerous levels. This keeps the transmitter running at reduced
power in order to prevent a temperature fault.
Current Foldback Alarm
During FM only operation, the PA attempts to lower its output
power when the final power transistor current approaches
dangerous levels. This keeps the transmitter running at reduced
power in order to prevent a current fault.
Muted Input Alarm
This alarm activates as a hardware failsafe mechanism when
the measured exciter drive input is below the minimum
threshold for safe operation. The approximately 10 mW
threshold is only for FM-only mode.
Railed Alarm
During FM only operation this indicates a condition where
automatic power control has reached its highest or lowest
possible control value indicating a lack of proper controllability.