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        DME measures diagonal distances, not horizontal distances. When the aircraft's altitude is much smaller than the slant distance to the control console, the slant distance measured by the DME can be considered as the horizontal distance from the aircraft to the control console. The DME operates in the UHF band, with a frequency range of 962-1213 MHz. The effective coverage range of the DME is 200 nm, and within this range, the system's ranging error is no greater than 0.5 nm. The International Civil Aviation Organization (ICAO) stipulates that a DME can provide distance information for a maximum of 100 aircraft.

        Only the BendixKing KN 63 offers so many high-performance DME functions in a compact, low-cost package. The TSO-certified KN 63 is a complete 100-watt, 200-channel long-range DME system, employing the latest state-of-the-art large-scale integrated circuit (LSI) technology. The KN 63 offers significant advantages in DME reliability and performance, is all-solid-state (tubeless), and can be equipped with single-panel or dual-panel indicators.