Bird Technologies ACM Series-Manual - Manual (Page 18)

Bird Technologies
6
Alarm on Zero Power
When the forward power is very small (< 2.5% of full scale), the mea-
sured VSWR becomes large due to the noise floor of the sensor. Under
these conditions, the VSWR level is meaningless. When the zero power
alarm is disabled, the VSWR will not be monitored at these low powers.
High Power Alarm
When the high power alarm is enabled, the forward power is continu-
ously monitored. The alarm trigger is a percentage of the Monitor’s
full scale power, from 0 – 125%. If the forward power is greater than
the trigger level, an alarm is triggered.
Low Power Alarm
When the low power alarm is enabled, the forward power is continu-
ously monitored. The alarm trigger is a percentage of the Monitor’s
full scale power, from 0 – 125%. If the forward power is less than the
trigger level, an alarm is triggered.
Push-to-Talk
The low power alarm and the VSWR alarm can falsely trigger when
the transmitter is not keyed. The Push-to-Talk feature uses a logic
input from the transmitter to control when alarm monitoring is active.
In order to prevent false alarms while monitoring for low power and
high VSWR, the Push-to-Talk feature must be enabled.