SIGNAL_POWERED_ALARM_RECEIVER

Published:2009/7/10 1:25:00 Author:May | From:SeekIC

On arrival of carrier signal at frequency to which antenna and input are tuned, transistor pulls in relay applying battery power to horn or light. No power is drawn front battery during standby time. For signals below 50 Mc,best pick up is obtained with single-wire an tenna 150 feet long, at right angles to line.of-sight path and as high as possible.-L.R.Crump, Radio Waves Power Transistor Circulls, Electron'Ics, 31:19, p 63-65.



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