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IFF Diversity switch

  • US 4,143,369 A
  • Filed: 10/25/1977
  • Issued: 03/06/1979
  • Est. Priority Date: 10/25/1977
  • Status: Expired due to Term
First Claim
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1. In an IFF system or the like having at least two antennas, an antenna switch with two control inputs for switching the IFF system from one antenna to the other and means producing a blanking pulse for each received interrogating pulse of a minimum magnitude from an external radar;

  • an antenna diversity switch comprising;

    a. a flip-flop controllable from a free-running condition to a bistable condition;

    b. means operatively connecting the two complementary outputs of said flip-flop to the two control inputs, respectively, of said antenna switch;

    c. flip-flop control means;

    d. means conducting the blanking pulses to said flip-flop control means;

    e. said flip-flop control means having a first magnitude output signal in response to the absence of blanking pulses thereto, and a second magnitude output signal in response to the presence of blanking pulses thereto; and

    f. means conducting said output signals from said flip-flop control means to said flip-flop in proper polarity to make said flip-flop free-running in response to said first magnitude signal and stopped in its instantaneous bistable state in response to said second magnitude signal.

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