High-Frequency (HF)
Return tp High-Frequency (HF) Bands
High-Frequency (HF) refers to a range of radio frequencies typically spanning from 3 MHz to 30 MHz in the electromagnetic spectrum. The HF band is widely used for long-distance communication via skywave propagation, where radio waves bounce off the Earth's ionosphere and return to the ground, allowing for communication over vast distances beyond the line of sight. HF communication is crucial for various applications, including amateur radio, maritime and aeronautical communication, international broadcasting, military communication, and emergency communication networks. The HF band is divided into multiple frequency segments, or bands, each allocated for specific purposes and modes of communication. Despite the advent of satellite and digital communication technologies, HF radio remains a vital means of global communication, particularly in remote or disaster-stricken areas where other forms of communication may be unavailable or unreliable. s://en.wikipedia.org/wiki/High_frequency