TRIP_WIRE_ALARM

Published:2009/7/9 23:13:00 Author:May | From:SeekIC

Control circuit tums converter, transmitter, and modulator on through relay contacts, to make 1,680-kc hybrid transmitter send tone-modukned signals to central station when trip wire is broken by ava lanche. Daylight on photocell initiates test transmission dcdly.-G.Neal and S. A. Stone, Hybrid Telemeter Detects Avalanches, Electtonics, 34:50, p 72-73.



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