Digitrac display system for air-traffic control. III. Indicators and displays

The digital plan-position indicator is housed in an octagonal casing that mounts into the operator's desk. The power supply for the indicator occupies a box on the floor behind the desk. The indicator is assembled from chassis and printed-card subunits. These all swing out on hinges and are therefore easily accessible. Each indicator can accommodate a 12- or 16-inch (305- or 406-millimeter) cathode-ray tube. The inputs to the indicator consist of radar range sweeps, symbols, and vector lines, all converted from digital to analogue form, and video signals, supplied in standard analogue form. It is also possible to display information received from several radar stations as an integrated picture.