Circuit for coupling a transistor to an angular modulation detector

Claim 1

A CIRCUIT FOR THE DEMODULATION OF ANGULAR MODULATED SIGNALS, COMPRISING FIRST AND SECOND RESONANT CIRCUITS TUNED TO A COMMON CENTER FREQUENCY, SAID FIRST AND SECOND RESONANT CIRCUITS COMPRISING INDUCTIVELY COUPLED PRIMARY AND SECONDARY WINDINGS RESPECTIVELY, SAID SECONDARY WINDING HAVING A CENTER TAP, A TERTIARY WINDING TIGHTLY INDUCTIVELY COUPLED TO SAID PRIMARY WINDING, MEANS CONNECTING ONE END OF SAID TERTIARY WINDING TO SAID TAP AND THE OTHER END THEREOF TO A POINT OF REFERENCE POTENTIAL, A SOURCE OF ANGULAR MODULATED SIGNALS, A TRANSISTOR HAVING A COLLECTOR ELECTRODE, MEANS CONNECTING SAID COLLECTOR TO SAID ONE END OF SAID TERTIARY WINDING WHEREBY SAID SIGNALS ARE COUPLED TO SAID PRIMARY WINDING ONLY BY THE INDUCTIVE COUPLING BETWEEN SAID PRIMARY AND TERITARY WINDINGS, AND DIODE LOAD MEANS CONNECTED TO SAID SECOND RESONANT CIRCUIT FOR PRODUCING AN OUTPUT VOLTAGE REPRESENTATIVE OF ANGULAR MODULATION OF SAID SIGNALS ABOUT SAID CENTER FREQUENCY.