| 摘要 |
A theft alarm system which operates in conjunction with a signal distribution system for protecting a plurality of devices. The devices receive a signal which is distributed from a central signal location by a plurality of coaxial cable distribution lines extending between the central signal location and termination points. A continuous loop of coaxial cable is threaded through each of the devices and spliced to the respective coaxial cable distribution line. A voltage is applied to each coaxial cable distribution line at its termination point. Voltage sensing switches adjacent the central signal location sense open-circuiting or short-circuiting of any of the continuous coaxial cable loops and actuate a theft alarm.
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