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Maximum usable frequency

Maximum usable frequency (MUF): In radio transmission using reflection from the regular ionized layers of the ionosphere, the upper frequency limit that can be used for transmission between two points at a specified time.

Note: MUF is a median frequency applicable to 50% of the days of a month, as opposed to 90% cited for the lowest usable high frequency[?] (LUF) and the optimum traffic frequency (FOT).

Source: from Federal Standard 1037C and from MIL-STD-188



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