| 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} |
| 161.1 | DF | .~.~ Frequency scanning {9} |
| 169.1 | ![]() | .~.~.~ With particular variable voltage or current tuning {1} |
| 169.2 | DF | .~.~.~.~> With varactor diode |