PARK AIR ELECTRONICS has launched a range of next-generation digital radios, aimed at coping with steadily increasing demand for voice and data communications between aircraft and air-traffic-controllers (ATCs), using existing very-high-frequency inks.

The UK company's new Series 5000 digital radios use so-called differential eight-phase shift-key modulation, replacing double-sideband modulation, with channel spacings of 25 or 8.33kHz. In time-division multiple-access mode, the radios can provide four simultaneous voice or data channels to and from four aircraft on a single channel frequency.

Source: Flight International