US PATENT SUBCLASS 331 / 31
.~.~ Plural significant heterodyne stages

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  DF  .~ With stable heterodyne oscillator or source {2}
31.~.~ Plural significant heterodyne stages

DEFINITION

Classification: 331/31

(under subclass 30) Subject matter wherein two or more beating or heterodyning means are utilized in the A.F.S. loop of the controlled oscillator.

SEE OR SEARCH THIS CLASS, SUBCLASS:

22, for oscillators having plural heterodyne stages in the A.F.S. loop, but wherein heterodyned oscillations of the controlled oscillator and the reference source signal are compared in a signal or phase comparator.

38, for beat frequency oscillator systems including plural beating or heterodyning means.