1.5 kilometres radio bidirectional barglar-proof alarm
ZMOU Zhu-wen Department of Physics, Guizhou Education College 550003 China
In this paper, the alarm is a radio multipath burglar-proof alarm circuit. It ismade up of main transmitter set and small-sized radio receiver set (with you). The main transmif-fer is adopted fregueney modulation, Its radio effective radius is 1.5 kilometres. Hardly the small-sized set is worked for receiving madio from 1.5 km distance when the main set is triggered. Thealarm also is adopted a triple-sensing trigger (touching lock, breaking wire and leaving position).
【CateGory Index】： TP21