NASA NTRS · 19800000294
Ultrastable automatic frequency control
Abstract
Center frequency of wideband AFC circuit drifts only hundredths of percent per day. Since circuit responds only to slow frequency drifts and modulation signal has high-pass characteristics, AFC does not interfere with normal FM operation. Stable oscillator, reset circuit, and pulse generator constitute time-averaging discriminator; digital counter in pulse generator replaces usual monostable multivibrator.
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Sabourin, D. J., Furiga, A.. 1981-01-01. Ultrastable automatic frequency control. https://ntrs.nasa.gov/citations/19800000294
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