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Simplified Automatic Stabilization of a Frequency-Modulated Oscillator

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1 Author(s)
Hollis, J.L. ; Formerly, Crosley Broadcasting Corporation, Cincinnati, Ohio; now, Collins Radio Company, Cedar Rapids, Iowa

A frequency-modulated exciter which incorporates a quartz-crystal discriminator for center-frequency stabilization of the modulated oscillator is described. The unit was designed as the exciter for a frequency-modulated broadcast transmitter. The frequency-stabilizing circuits are the unique portion and are described in detail. Circuit simplicity is attained by operating the discriminator at the modulated-oscillator frequency, thus eliminating heterodyning and mixing circuits. A special bridge circuit, operating on the modulator bias, maintains the average frequency at the midpoint of the discriminator. Performance and stability of a completed unit are briefly discussed.

Published in:

Proceedings of the IRE  (Volume:36 ,  Issue: 9 )