US PATENT SUBCLASS 331 / 30
.~ With stable heterodyne oscillator or source

Current as of: June, 1999
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331 /   HD   OSCILLATORS

1 R  DF  AUTOMATIC FREQUENCY STABILIZATION USING A PHASE OR FREQUENCY SENSING MEANS {16}
30.~ With stable heterodyne oscillator or source {2}
31  DF  .~.~> Plural significant heterodyne stages
32  DF  .~.~> With particular discriminator (e.g., LPF and HPF) {1}

DEFINITION

Classification: 331/30

(under subclass 1) Subject matter wherein the A.F.S. loop of the controlled oscillator comprises (1) means for beating or heterodyning the generated oscillations of the controlled oscillator with the oscillations of the reference oscillator or source and (2) a single input discriminator means responsive to the resulting heterodyned oscillations, which discriminator produces an output error or control signal proportional to the frequency deviation of the controlled oscillator from that of the reference source, the error

signal being utilized to restore the generated frequency of the controlled oscillator to the desired relationship with the reference frequency.

SEE OR SEARCH THIS CLASS, SUBCLASS:

37+, for beat frequency oscillators, per se.