| 342 / | HD | COMMUNICATIONS: DIRECTIVE RADIO WAVE SYSTEMS AND DEVICES (E.G., RADAR, RADIO NAVIGATION) |
| 73 | DF | RETURN SIGNAL CONTROLS RADAR SYSTEM {3} |
| 82 | | .~ Transmitter {2} |
| 83 | DF | .~.~> Signal phase or frequency other than pulse repetition frequency (PRF) {2} |
| 88 | DF | .~.~> Transmission timing (e.g., ring around) |