Operating radio alarm installation for building intruder alarm system

摘要

The installation consists of a central office with receiver, computer, and transmitter. An alarm comprises a transmitter, evaluator, and an alarm unit. The central receiver is tuned to the radio signal of the alarm transmitter. In case of an incident the alarm emitted radio signals are checked for the point of origin. In case of an incident the alarm radio signal is retransmitted after a specified time period so that either the alarm is erased, if an interference signal is received over a given time period, or an alarm signal is generated, if the interference signal is missing after the given time period.