MUF (Max.Usable freq.)

Maximum usable frequency (MUF) describes, 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, independent of transmitter power. This index is especially useful in regard to shortwave transmissions.

Example:

28                                               
24                                               
21                                               
18                                               
14                                               
10                                               
7                                               
3.5                                               
Path                                                
Utc0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23

  Strong
  Good
  Fair
  Poor

All path is in
  Daylight
  Night
  Mixed

MUF calculation for NA (North America)
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MUF calculation for SA (South America)
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MUF calculation for South Africa (Zs)
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MUF calculation for New zealand (ZL)
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MUF calculation for Australia (VK)
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MUF calculation for Japan (JA)
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MUF calculation for Alaska
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