The External Alarm input is
an optional fault input. It is not
necessary to use it for normal operation.
It can be hooked up to anything from a rear door
to a coffee maker, but……
Typically The External Alarm
input is used for a Low Elevation alarm input.
Some antennas are equipped
with a Low Elevation alarm output. This is
a dry relay contact output that can be used to
signal the outside world that the antenna has an
elevation where the amplifiers should not be
transmitting.
Besides monitoring this Low
Elevation alarm, it can also be used to produce
a summary RF inhibit on both amplifiers when an
external alarm is present.
This is user defined.
The External alarm input is shipped as a
normally closed relay input to the controller.
When this input “opens” both amplifiers are
inhibited. To defeat this function,
simply place the dip switch S4 (located on the
main PCB) -switch 3 in the Off position.
On the main PCB inside the
controller is a 3 position dip switch (S4).
This dip switch may be used to alter the
external alarm input.
S4-switch 1
On = inhibit in the event of an external alarm
Off = do not inhibit in the event of an external
alarm
S4-switch 3
On = external alarm fault input is normally
closed
Off = external alarm fault input is normally
open
not associated with external
alarm is S4-switch 2. This dip switch is
used to tell the main program if 1 or 2
waveguide switches (output switches) are in the
system
