Empirical Earth · Radio & Long-Distance Signals

Microwave links are built around the curve

The claim

“Microwave towers prove flatness — line-of-sight signals just go straight.”

What is measured

On a 30 km microwave hop the Earth bulges ~13 m into the path; engineers raise the towers to clear it and plot the link on a 4/3-radius curved Earth. The curve is a routine design input, not a debate.

What would show this is wrong

a long microwave link that closed with no extra tower height and no earth-bulge / 4-3-radius correction in its path profile.

Sources

  1. Line-of-sight propagation & the radio/earth-bulge. Long microwave links must raise antennas to clear the Earth’s bulge (~13 m on a 30 km hop) and the Fresnel zone; clearances are computed on link
  2. The first transcontinental microwave relay. On 17 August 1951 AT&T inaugurated the first coast-to-coast microwave radio-relay route, carrying telephone and television signals across a chain link
The full entry, with the working →

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