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"Wild" mobile disable circuit

  • US 3,936,616 A
  • Filed: 09/23/1974
  • Issued: 02/03/1976
  • Est. Priority Date: 09/23/1974
  • Status: Expired due to Term
First Claim
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1. In a mobile telephone system including a mobile unit having a transmitter, a receiver and a handset having on hook and off hook positions and a base station for communication with the mobile receiver and transmitter, means for disabling the mobile transmitter when said transmitter is transmitting its carrier but is not connected to another party comprising:

  • means for receiving a sequence of pulses of audio frequencies,means for counting the number of said pulses,means responsive to the count of a predetermined number of said pulses for shutting off said transmitter when said handset is non-functionally in its off hook position,means for inactivating said responsive means when said handset is in its on hook position, andmeans for preventing false operation of said responsive means by voice signals when said handset is in its functionally off hook position.

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