US PATENT SUBCLASS 455 / 189.1
.~.~.~ With plural separate mixer or converter circuits

Current as of: June, 1999
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455 /   HD   TELECOMMUNICATIONS

130  DF  RECEIVER OR ANALOG MODULATED SIGNAL FREQUENCY CONVERTER {24}
150.1  DF  .~ Signal selection based on frequency (e.g., tuning) {13}
188.1  DF  .~.~ Band selection {4}
189.1.~.~.~ With plural separate mixer or converter circuits

DEFINITION

Classification: 455/189.1

With plural separate mixer or converter circuits:

(under subclass 188.1) Subject matter including two or more separate and distinct means for generating an output signal equal to the sum or difference of a local oscillator frequency and the carrier wave frequency or means for converting the carrier wave frequency to some other frequency by combining it with another frequency.

(1) Note. The separate conversion means may be in separate signal channel paths for providing separate intermediate frequency outputs or may provide input signals for a common intermediate frequency channel.

SEE OR SEARCH THIS CLASS, SUBCLASS:

22, for radio repeaters with plural conversion stages.

146, for panoramic receivers which may comprise plural separate mixers or converter circuits.

168.1, for frequency scanning receivers which may comprise plural separate mixers or conversion circuits.

176.1, for manual, mechanical, or electromechanical signal selection combined with band selection which may include plural frequency conversion means. 180.1, for channel or station selection receivers combined with band selection means which may comprise plural frequency conversion circuits.

207, for frequency modulation receivers with plural conversion means.

314+, for receivers with frequency conversion systems comprising a plurality of plural separate successive conversion means.