US PATENT SUBCLASS 331 / 24
.~.~.~ With motor comparator

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}
18  DF  .~ With reference oscillator or source {5}
23  DF  .~.~ Sensing modulation (e.g., frequency modulation controlled oscillator {1}
24.~.~.~ With motor comparator

DEFINITION

Classification: 331/24

(under subclass 23) Subject matter wherein the signal comparator comprises a polyphase motor (usually of the two phase or split-phase type) having at least two phase windings, the signal representative of the low frequency modulated oscillations of the controlled oscillator being applied to one phase winding and the signal representative of the low frequency source being applied to another phase winding of the motor, the rotor of the motor is mechanically coupled to the frequency adjusting means of the oscillator.

SEE OR SEARCH THIS CLASS, SUBCLASS:

13, for a single oscillator with plural A.F.S. means wherein at least one of the A.F.S. means includes an electric motor for adjusting an oscillator frequency control means.

29, for A.F.S. oscillators with electromechanical signal comparator means.

35, for A.F.S. oscillators with electromechanical controlled oscillator frequency adjusting means.