Discussion
Microwave link repeaters are typically 50 km apart
Answer: C
Microwave links work on line of sight, and because of the curvature of the earth the antennas on towers can see each other only up to about 50 km, so repeaters are placed at about that spacing. Atmospheric attenuation and the output power of the tubes matter for the link budget but do not fix the spacing, and the dc voltage supplied has nothing to do with it. Radio relay towers are usually about 50 km apart for this reason, and an antenna height of about 50 m is needed to reach that distance, because the radio horizon grows with the square root of the height. The answer is because of the earth's curvature.
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