Title: Bidirectional communication system for electrical power networks

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Abstract: An arrangement of communication components to provide communications between a central control center and various customer load locations in an electrical power distribution system. Control or interrogation signals are originated at the control center and transmitted over a suitable facility, such as a telephone line, to an FM broadcast station. The control signals frequency modulate an ultrasonic subcarrier which modulates the FM broadcast transmitter simultaneously with the normal broadcast program material. Radio receivers at the customer load locations receive, filter, and decode the broadcast signals which are used to activate the control or logic circuits associated with the customer location. A reply signal is generated at the customer location and applied to the power lines by carrier techniques. The power line carrier reply signal is remotely detected by a suitable receiver and transferred over a suitable wire line facility which terminates at the control center.


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