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CONCURRENT SAME-FREQUENCY FM RADIO REPEATER

  • US 3,636,453 A
  • Filed: 05/07/1969
  • Issued: 01/18/1972
  • Est. Priority Date: 05/07/1969
  • Status: Expired due to Term
First Claim
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1. A concurrent same-frequency repeater for receiving, amplifying, and retransmitting frequency-modulated radio signals, comprising:

  • a. a radiofrequency hybrid having two pairs of respectively conjugate ports, b. an antenna system coupled to one of said ports, c. a matching network coupled to the port that is conjugate to the one to which said antenna is coupled, and designed to simulate the impedance of said antenna system, d. a radiofrequency amplifier having input and output terminals coupled respectively to the other conjugate pair of ports, the gain of said amplifier being less than the hybrid isolation between said last-mentioned ports, and e. an injection-locked oscillator coupled to a point in the circuit between said last-mentioned ports, said oscillator having a tendency to synchronize with radiofrequency signals at said point that are substantially weaker than the output of said oscillator.

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