Crystal controlled oscillator with frequency modulating circuit

Claim 1

A VARIABLE FREQUENCY SELF-OSCILLATOR WHICH COMPRISES: A TRANSISTOR AMPLIFIER HAVING AN INPUT ELECTRODE AND AN OUTPUT ELECTRODE, A PIEZOELECTRIC CRYSTAL ELEMENT COUPLED TO SAID OUTPUT ELECTRODE, A PATH COUPLED TO SAID ELEMENT FOR FEEDING BACK TO SAID INPUT ELECTRODE A SIGNAL THAT VARIES IN RELATED CONFORMANCE WITH THE MAGNITUDE OF A VOLTAGE DEVELOPED ACROSS SAID ELEMENT, WHEREBY SAID OSCILLATOR OPERATES PREFERENTIALLY AT THE ANTIRESONANT FREQUENCY OF SAID CRYSTAL ELEMENT, AN INDUCTOR CONNECTED IN SERIES WITH SAID ELEMENT AND PROPORTIONED TO ESTABLISH, WITH THE EFFECTIVE CAPACITANCE OF SAID ELEMENT, A SERIES RESONANT FREQUENCY SPACED, ON THE FREQUENCY SCALE, BELOW SAID ANTIRESONANT FREQUENCY, WHEREBY THE SHOULDER OF THE VOLTAGE-FREQUENCY CHARACTERISTIC OF SAID CRYSTAL AND INDUCTOR, TAKEN TOGETHER, IN EXTENDING FROM SAID ANTIRESONANT FREQUENCY TO SAID SERIES RESONANT FREQUENCY, IS MORE NEARLY LINEAR THAN THAT OF SAID CRYSTAL ELEMENT ALONE, A VOLTAGE-SENSITIVE VARIABLE CAPACITOR CONNECTED IN SHUNT WITH THE SERIES COMBINATION OF SAID CRYSTAL ELEMENT AND SAID INDUCTOR, AND CONNECTIONS FOR IMPRESSING A MODULATING VOLTAGE ON SAID VARIABLE CAPACITOR, THEREBY TO CAUSE DEVIATIONS OF THE OSCILLATION FREQUENCY FROM SAID ANTIRESONANT FREQUENCY.