Which frequency range is classified as High Frequency (HF)?

The classification of High Frequency (HF) range is specifically identified as 3 to 30 megahertz (MHz). This frequency band is crucial for various forms of communication, particularly in long-range radio transmissions. HF signals can travel long distances by reflecting off the ionosphere, making them valuable for maritime and aviation communications, especially over vast areas where line-of-sight communication is not feasible.

Understanding the HF range is fundamental for operations involving radio communication and navigation systems, as selections appropriate technology for the specific frequency band can impact signal clarity, range, and the potential for interference. Each frequency range serves distinct purposes, with HF particularly recognized for its ability to facilitate international communications.