| the highest frequency that would permit acceptable performance of a radio circuit by signal propagation via the ionosphere between given terminals below the ionosphere at a given time, under specified working conditions
NOTE 1 – Acceptable performance may for example be quoted in terms of maximum error ratio or required signal/noise ratio.
NOTE 2 – Specified working conditions may include such factors as antenna types, transmitter power, class of emission and required information rate.
NOTE 3 – The acronym MUF stands for "Maximum Usable Frequency".
|