MCQ Practice Question

The maximum usable frequency (MUF) for a given ionospheric path is generally?

AAt least as high as the relevant critical frequency and depends on path geometry
BAlways zero
CAlways lower than every critical frequency
DIndependent of ionosphere and path

Correct Answer: A. At least as high as the relevant critical frequency and depends on path geometry

Explanation: For oblique incidence, frequencies above the vertical-incidence critical frequency may be returned; MUF depends on layer conditions and geometry.

Reference: Standard antenna and wave propagation: muf