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} |
191.1 | DF | .~.~.~ With plurality of tuned circuits {2} |
191.2 | .~.~.~.~ Varactor tuned |