US PATENT SUBCLASS 331 / 22
.~.~ 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}
18  DF  .~ With reference oscillator or source {5}
22.~.~ Plural significant heterodyne stages


DEFINITION

Classification: 331/22

(under subclass 18) Subject matter wherein two or more frequency beating or heterodyning means, or stages, are effectively connected in the A.F.S. loop of the controlled oscillator.

SEE OR SEARCH THIS CLASS, SUBCLASS:

31, for oscillators with plural heterodyne stages in the A.F.S. loop, but wherein the discriminator is of the single input type, i.e., no comparison of the oscillator frequency with a reference frequency or source is made at the discriminator.

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