| 342 / | HD | COMMUNICATIONS: DIRECTIVE RADIO WAVE SYSTEMS AND DEVICES (E.G., RADAR, RADIO NAVIGATION) |
| 73 | DF | RETURN SIGNAL CONTROLS RADAR SYSTEM {3} |
| 89 | | .~ Receiver {4} |
| 90 | DF | .~.~> Automatic target detection |
| 91 | DF | .~.~> Gain or threshold {2} |
| 94 | DF | .~.~> Gating {1} |
| 98 | DF | .~.~> Frequency {2} |