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} |
193.1 | .~.~ With antenna circuit tuning {2} | |
193.2 | DF | .~.~.~> With plural resonant circuits |
193.3 | DF | .~.~.~> Including varactor diode |