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Backup Control Modes
STX Generation II systems come equipped with two backup control methods. Emergency control mode is
integrated standard with all systems and simply allows the system to continue functioning in the event of
a system controller failure. The backup system control and exciter feature utilizes an entire controller and
exciter sub-system to also allow for full control interfacing with an identical synchronized internal standby
exciter.
Emergency Control Mode
In the event of a loss in communications with the system controller, all sub-systems enter
emergency control mode. Behavior when in this mode depends on user specified emergency
power levels. This must be set to the desired emergency power level in order to enable the
feature, which comes from the factory set at 0 W and is effectively disabled. The transmitter will
continue to function at full emergency power as long as the exciter maintains drive to all power
amplifiers. The power amplifier can only enter emergency power mode from a working state, so
it will not unmute or initialize in the emergency power state.
Standby System Control and Exciter
For complete system control and internal exciter redundancy an exciter switcher option can be
acquired. These packages supply all required hardware for utilization of standby units in STX
transmitters.
Detailed information including installation and operation of this optional configuration are
contained in an application guide. A copy is included in standard kits and/or inserted in the front
of the binder containing this manual if shipped as part of the same order. For electronic copies of
this and any other technical documentation please visit
http://www.bdcast.com/information-
center/
and follow navigation on the left side of the page – authorized login is required.
