Title :
A Coupled-Circuit Frequency Modulator
Author_Institution :
Absent on leave from the University of North Dakota, Grand Forks, North Dakota; now, Voice Communication Laboratory, Waco Army Air Field, Waco, Texas
fDate :
6/1/1944 12:00:00 AM
Abstract :
The circuit developed in this paper uses a condenser microphone to vary the reactance of an oscillator tank circuit. Using a coupled circuit and a tuning inductance across the condenser microphone, a single-tube wide-band frequency modulator was constructed for use on 40 megacycles.
Keywords :
Capacitance; Circuit optimization; Coupling circuits; Frequency modulation; Inductance; Microphones; Oscillators; Transmitters; Tuning; Wideband;
Journal_Title :
Proceedings of the IRE
DOI :
10.1109/JRPROC.1944.231367