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Communication system and method

  • US 3,993,997 A
  • Filed: 12/17/1971
  • Issued: 11/23/1976
  • Est. Priority Date: 03/28/1969
  • Status: Expired due to Term
First Claim
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1. A method of preventing effective communication between stations otherwise capable of communicating with each other and located more than a selected distance from each other, at least one of said stations including receiver means responsive to energy transmitted from the other station, comprising the steps of transmitting a first pulse to said stations from a position remote from said stations so that the first pulse arrives at said stations at substantially the same time, transmitting a second pulse from the other station upon receipt of said first pulse, receiving the first pulse at said one station, enabling the receiver means in response to receipt of said first pulse at said one station, and decoupling a portion of the receiver means after receipt of the first pulse at the one station, the time of decoupling being determined by the selected distance and the propagation time of the energy between the stations.

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