US PATENT SUBCLASS 455 / 285
.~.~.~.~ With image frequency suppression

Current as of: June, 1999
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130  DF  RECEIVER OR ANALOG MODULATED SIGNAL FREQUENCY CONVERTER {24}
269  DF  .~ With wave collector (e.g., antenna) {4}
280  DF  .~.~ With coupling to a stage of the receiver {7}
283  DF  .~.~.~ Undesired signal or noise control (e.g., antistatic) {5}
285.~.~.~.~ With image frequency suppression

DEFINITION

Classification: 455/285

With image frequency suppression:

(under subclass 283) Subject matter wherein the coupling includes means whereby an unwanted signal appearing at the collector and whose frequency differs from the received signal by twice the intermediate frequency, is suppressed or eliminated.

(1) Note. For similar structure not tuned specifically to the superheterodyne image frequency refer to subclass 286 in a noise reducing system, and subclass 290 for general wave collector coupling systems using tuned circuits.

SEE OR SEARCH THIS CLASS, SUBCLASS:

302, for image frequency suppression in general.