Propagation

Explanation of question 23

Maximum usable frequency (MUF) is defined as
  1. the highest frequency returned when radiation is vertically upwards
  2. the maximum frequency reflected by the ionosphere
  3. that frequency at the high end of a particular frequency band
  4. the highest frequency that will radiate from an antenna maximum usable frequency

The answer is :- 2 The definition of maximum usable frequency (m.u.f.) is the maximum frequency reflected by the ionosphere.

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