Alarm giver
An alarm device is an additional device for a radio system that outputs coded signals in the form of five-tone sequences or digital data telegrams ( DAG , digital alarm device) that are sent by radio. This five-tone sequence or the data telegram activates the operational radio message receiver , for example from fire brigade members or disaster protection forces. If certain double tones are broadcast in addition to the five-tone sequence, the siren can be switched on at the scene , e.g. B. for fire alarm.
Such alarm devices exist as separate individual devices or as programs for use on PCs . As an independent alarm device, an alarm transmitter can replace the control center computer in smaller siren systems . In systems with a control center computer, the alerting unit serves as an additional alerting point or as a fall-back level if the control center computer fails. B. when maintenance work is carried out on the computer. As a result, emergency services can be alerted despite maintenance work on the computer.
Alarm devices are mainly used in the BOS radio to alert emergency services, but they have also proven themselves for calls in the CB radio , for example .