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RADIO SIGNAL INITIATED REMOTE SWITCHING SYSTEM

  • US 3,665,475 A
  • Filed: 04/20/1970
  • Issued: 05/23/1972
  • Est. Priority Date: 04/20/1970
  • Status: Expired due to Term
First Claim
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1. A radio communications system for initiating actuation of a device from a remote point, said system comprising, in combination:

  • A. a transmitter operable to transmit a continuous carrier signal periodically modulated with a burst of a tone signal;

    B. a receiver adapted to receive transmissions from said transmitter;

    C. a detector in said receiver for recovering said periodic bursts of tone signal from said continuous carrier signal;

    D. means for converting each said tone signal burst to a corresponding output pulse and for storing said pulse;

    E. a gate connected to control passage of each stored pulse from storage;

    F. gate control means connected to the output of said detector for enabling said gate to pass stored output pulses only during the periodic intervals of reception of unmodulated carrier signal;

    G. means for accumulating output pulses passed by said gate when enabled; and

    H. switching means coupled to said accumulating means and energized thereby when a desired condition of pulse accumulation has been reached to initiate actuation of the device.

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