User's Manual

Technalogix Ltd TAVD-500 Transmitter
VI-6
Fault Shutdowns
On the LCD (Liquid Crystal Display) the following messages may appear:
The Amplifier overdrive shutdown is set to 115%. If the Amplifier is being overdriven (the RF
output level is too high) the control system will automatically attenuate the RF input signal to the
PA. It will continue attenuating this signal until the RF output is below 115% total power.
If Reflected Power has been detected at the output of the transmitter, the unit will shut down for
4 seconds. This occurs 5 times – If the fault is clear the PA enables itself. If the fault still exists
after 5 times, the PA disables the carrier for 10 minutes and cycles until the fault clears. During
the disable time (10 minutes) the unit will still alarm with a High Reflected message on the front
panel.