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A Coupled-Circuit Frequency Modulator

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1 Author(s)
O'Brien, E.J. ; Absent on leave from the University of North Dakota, Grand Forks, North Dakota; now, Voice Communication Laboratory, Waco Army Air Field, Waco, Texas

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.

Published in:

Proceedings of the IRE  (Volume:32 ,  Issue: 6 )