↑ What is HF Propagation?

This page is part of the project "Understanding HF Propagation."
by Doron Tal, 4X4XM

High-frequency (HF) radio signals ranging from 3 to 30 MHz propagate by refracting off the ionosphere, facilitating long-distance communication.

Propagation Modes
During the day, the ionosphere becomes more ionized, with higher frequencies bounced back to Earth. At night, it becomes less ionized, with lower frequencies bounced back to Earth.

The project "Understanding HF Propagation," focuses on skywave propagation,
shows near-real-time indices and explains what the terms mean.
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