Empirical Earth · Radio & Long-Distance Signals

The radio band plan — ELF to microwave, every band shaped by the curve

The claim

“Radio just goes where it pleases over a flat plane — distant AM at night and submarine contact prove nothing about a globe.”

What is measured

The spectrum is organized by Earth’s shape: long waves hug or circle the globe, short waves skip over its horizon, and microwaves stop at the line of sight. explains the physics; this is the whole dial at a glance. The measured distance for each band is in radio distance records.

What would show this is wrong

tuning a cheap AM set after dark and logging stations from distant states or countries that are gone by day; or by measuring the Schumann resonance near 7.83 Hz, whose frequency is fixed by Earth’s circumference. A flat plane predicts neither the day/night swing nor a cavity that rings at the speed of light divided by 40,000 km.

Sources

  1. ITU radio band designations (ELF–EHF). The ITU-R V.431 nomenclature divides the spectrum into bands by decade: ELF (3–30 Hz), SLF, ULF, VLF, LF, MF, HF, VHF, UHF, SHF (3–30 GHz) and EHF (30– link
  2. AM radio: ground wave by day, skywave by night (FCC). The FCC notes that medium-wave AM travels by ground wave during the day, with coverage set by power, frequency and ground conductivity, link
  3. Schumann resonance & the Earth–ionosphere waveguide. The conducting Earth and ionosphere form a spherical-shell cavity in which global lightning excites standing electromagnetic waves — the link
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