| 455 / | HD | TELECOMMUNICATIONS |
| 130 | DF | RECEIVER OR ANALOG MODULATED SIGNAL FREQUENCY CONVERTER {24} |
| 296 | DF | .~ Noise or interference elimination {10} |
| 308 | ![]() | .~.~ With amplitude limiter {1} |
| 309 | DF | .~.~.~> In demodulator or low frequency (audio amplifier circuit) |