↑ What is HF Propagation?

By Doron Tal, 4X4XM

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

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

The project "Understanding HF Propagation" provides a detailed overview and tutorials on HF propagation.
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