Maximum Usable Frequency
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
. This index is especially useful in regards to
shortwave
transmissions. 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
Frequency of optimum transmission
(FOT).
Original source:
From
Federal Standard 1037C
and from
MIL-STD-188
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