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8.33 kHz spacing

The 25kHz spacing has been used for decades in air-to-air communication in airsports. But this technology is outdated and due to be replaced by systems using 8.33 kHz spacing, allowing for many more communication channels within the same radio band. The official document from the EC (ref. 1079/2012) states that "Member States shall ensure that by 31 December 2017 at the latest all radios have the 8,33 kHz channel spacing capability with the exception of ground radios operated by air navigation service providers."

Find here the notes and memos from Belgocontrol, the Belgian Civil Aviation Authority (BCAA) and the Royal Belgian Aeroclub as well as the EC document.

Till Jan.1st 2018, the use of outdated radios using the 25 kHz spacing is tolerated.