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The critical frequency of an ionosphere layer is 10 MHz. What is the maximum launching angle from the horizon for which a 20 MHz wave will be reflected by the layer—
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- 0º
- 30º
- 60º
- 90º
Correct Option: B
fc = 10 MHz
MUF = sec θ. fc
20 = 10 sec θ
sec θ = 2;
Therefore θ = 60º (angle of incidence)
hence, launching angle
= 180 – (90 + 60) = 30º.
