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Tuneable double-tuned circuits with variable coupling

  • US 3,192,491 A
  • Filed: 12/06/1962
  • Issued: 06/29/1965
  • Est. Priority Date: 12/06/1962
  • Status: Expired due to Term
First Claim
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1. IN A DOUBLE-TUNED BAND-PASS FILTER, A TUNEABLE PRIMARY CIRCUIT INCLUDING A FIRST CONDENSER, A TUNEABLE SECONDARY CIRCUIT INCLUDING A SECOND CONDENSER, THE Q OF SAID CIRCUITS BEING SUBSTANTAILLY EQUAL, MEANS FOR VARYING THE CAPACITY OF SAID FIRST AND SECOND CONDENSERS AS A FUNCTION OF FREQUENCY IN UNISON FOR TUNING SAID CURCURCUITS, A THIRD CONDENSER CONNECTED IN COMMON WITH SAID PRIMARY AND SECONDARY CIRCUITS FOR COUPLING SAID CIRCUITS, AND MEANS FOR VARYING THE CAPACITY OF SAID THIRD CONDENSER AS A NON-LINEAR FUNCTION OF FREQUENCY DIFFERENT FROM SAID FIRSTNAMED FUNCTION WHEREBY TO VARY COEFFICIENT OF COUPLING,

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