Automatic frequency controlled signal generator

Claim 1

AN AUTOMATIC FREQUENCY CONTROLLED SIGNAL GENERATOR COMPRISING: A FREE-RUNNING OSCILLATOR INCLUDING A RESONANT CIRCUIT FOR PRIMARILY DETERMINING THE FREE-RUNNING OPERATING FREQUENCY OF SAID OSCILLATOR; A VARIABLE IMPEDANCE NETWORK INCLUDING A SEMICONDUCTOR DEVICE HAVING INPUT, OUTPUT AND COMMON TERMINALS WITH AN INPUT CONDUCTIVE PATH BETWEEN ITS INPUT AND COMMON TERMINALS IN A PREDETERMINED DIRECTION AND AN OUTPUT CONDUCTIVE PATH BETWEEN ITS OUTPUT AND COMMON TERMINALS IN A PREDETERMINED DIRECTION, AND A UNIDIRECTIONAL DEVICE COUPLED AT LEAST PARTIALLY IN SHUNT WITH ONE OF SAID CONDUCTIVE PATHS AND POLED TO CONDUCT IN A DIRECTION OPPOSITE TO THAT OF THE SHUNTED PATH, THE IMPEDANCE PRESENTED BY SAID NETWORK VARYING OVER A RELATIVELY WIDE RANGE IN RESPONSE TO AMPLITUDE VARIATIONS OF A CONTROL SIGNAL APPLIED BETWEEN SAID INPUT AND COMMON TERMINALS;