Set Selcall Pre-Amble; External Alarm Type - Barrett 950 HF Operating And Installation Manual

BARRETT 950 HF TRANSCEIVER

Set Selcall Pre-amble

Sets the length of the selcall preamble. The length of preamble is set dependant on the
number of channels being scanned. The preamble can be set from 1 to 10 seconds. Allow
500mS for each selcall channel to be scanned plus one second, E.g. to scan 8 selcall
channels :- 500mS x 8 + 1 sec. = 5 seconds - the example below illustrates a pre-amble
time set to 5 seconds.

External alarm type

... selects which type of alarm signal is generated on the External Alarm, pin 17 on the
auxiliary connector.
... selects latched alarm, the alarm output will be continuously active for 30 seconds and
then turn off. This sequence will occur unless the PTT is activated or the clear key is
pressed during the sequence.
... selects the pulsed alarm, the alarm will turn on after 15 seconds and remain on for 15
seconds, then will turn off. This sequence will occur unless the PTT is activated or the clear
key is pressed during the sequence.
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