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} |
196.1 | DF | .~.~ Including variation of local oscillator frequency {1} |
197.1 | DF | .~.~.~ By simultaneous control with signal selection {3} |
197.2 | .~.~.~.~ Variable capacitor tuned {1} | |
197.3 | DF | .~.~.~.~.~> Including additional tuning circuit |