Discussion
What is the fading region of a medium wave transmitter?
Answer: C
Where the two mechanisms arrive with similar amplitude but with a path difference that varies as the ionosphere moves, they alternately add and cancel and the signal fades deeply. The effect is worst at night and at the edge of the ground wave service area. Antennas with a reduced high angle radiation are used to push the fading zone further out. Interference between two paths of comparable strength is the general cause of fading in every propagation mechanism.
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