Code operated switching device for communications systems...

Details Code operated switching device for communications systems... Code operated switching device for communications systems...

H - Electricity

04

B

325/31

H04B 1/22 (2006.01)

Patent

CA 1066778

CODE OPERATED SWITCHING DEVICE FOR COMMUNICATION SYSTEMS AND THE LIKE Abstract of the Disclosure The embodiment of the invention disclosed herein is directed to a code operated switching device having a receiver for handling RF frequencies in a superheterodyne fashion without the need of local oscillators, or the like at the receiver. Input means is provided for receiving first and second RF frequencies having a predetermined frequency difference. The RF frequencies are FSK modulated simultaneously, one frequency increasing and the other decreasing, so that the frequency difference will produce a control signal at the out- put of an FM audio discriminator circuit. The control signal can be code modulated with series digital pulse information and applied to a code logic circuit that will detect if the proper code for the receiver has been received. If the proper code is received the logic circuit will energize an active control element such as a relay or the like to allow data to be transmitted back through the switching device.

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