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Maximum usable frequency

In radio transmission, maximum usable frequency (MUF) is the highest radio frequency that can be used for transmission between two points on Earth by reflection from the ionosphere at a specified time, independent of transmitter power. This index is especially useful for shortwave transmissions.

Optimum Working Frequency
Another important parameter used in skywave propagation is the optimum working frequency (OWF), which estimates the maximum frequency that must be used for a given critical frequency and incident angle. It is the frequency chosen to avoid the irregularities of the atmosphere. \mathrm{OWF} = 0.85 \mathrm{MUF} = 0.85 f_\mathrm{c} /(cos\theta) ==See also==
Source: Wikipedia ↗
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