| 342 / | HD | COMMUNICATIONS: DIRECTIVE RADIO WAVE SYSTEMS AND DEVICES (E.G., RADAR, RADIO NAVIGATION) |
| 350 | DF | DIRECTIVE {10} |
| 385 | DF | .~ Beacon or receiver {2} |
| 417 | DF | .~.~ Direction-finding receiver only {14} |
| 432 | DF | .~.~.~ With plural fixed antenna pattern comparing {5} |
| 433 | | .~.~.~.~ Successively commutated {3} |
| 434 | DF | .~.~.~.~.~> Including more than two antennas |
| 435 | DF | .~.~.~.~.~> By diode switching |
| 436 | DF | .~.~.~.~.~> By modulation |