What is the typical frequency range for HF communications?

The typical frequency range for High Frequency (HF) communications is from 3 MHz to 30 MHz. This frequency band is utilized for various forms of communication, including international broadcasting, maritime communication, and aviation communication. HF signals are particularly valuable as they can be reflected off the ionosphere, enabling long-distance communication across the globe, which is not as effective in other frequency bands such as VHF or UHF.

Communications in the HF range are often used in situations where line-of-sight communication is not possible, and this range allows for effective transmission over significant distances. HF is crucial for long-haul radio services and emergency communications, as it can penetrate regions where other frequencies might fail. The ability of HF signals to travel long distances by being reflected off the ionosphere is a unique feature that distinguishes it from the other frequency bands.