Frequency Spacing COMMS

The standard spacing of frequencies is 25kHz (note kilo, not mega.) By reducing this to 8.33kHz, more frequencies can be obtained from the same range (in this case 118-137Mhz.) Because of the density of European airspace and the need for more frequencies, in upper airspace (FL195 and above) this ability to conduct 8.33kHz spacing is mandatory.

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Above what level is 8.33khz frequency spacing mandatory?
Question 0

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