US PATENT SUBCLASS 455 / 289
.~.~.~ With coupling varying, regulating, or control

Current as of: June, 1999
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455 /   HD   TELECOMMUNICATIONS

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}
289.~.~.~ With coupling varying, regulating, or control

DEFINITION

Classification: 455/289

With coupling varying, regulating, or control:

(under subclass 280) Subject matter wherein the coupling means includes means whereby the reaction of the antenna or collector output circuit upon the receiver input circuit of the receiver is varied, maintained constant, or controlled by design to react over the frequency range in a desired way.

(1) Note. An example of the subject matter to be found in this subclass is an antenna connected to the input of a receiver through a variometer.

(2) Note. The systems to be found here are variable tuned circuits in the antenna or collector-receiver coupling circuits and are not intended to be utilized as preselector or tuning means for the receiver. For wave selecting (i.e., tuning), search this class (455), for subclass 193.1.

SEE OR SEARCH CLASS

343, Communications: Radio Wave Antennas,

854, and 861 for adjustable antenna coupling means.