What is the frequency range classified as HF in the electromagnetic spectrum?

The frequency range classified as High Frequency (HF) in the electromagnetic spectrum is 3 MHz to 30 MHz. This designation is essential because the HF band is widely used for various communications purposes, including amateur radio, maritime communication, and aviation.

The HF range is notable for its ability to support long-distance communication due to its propagation characteristics, particularly via the ionosphere. Signals in this range can reflect off the ionosphere and travel beyond the horizon, making it ideal for global communication unlike higher frequency bands which are limited by line-of-sight propagation.

Understanding this frequency range is critical for electronics technicians, as it influences the design and implementation of communication systems and equipment that operate within this band.