High frequency designates the portion of the radio spectrum between 3 and 30 megahertz. Signals in this band can reflect off the ionosphere, allowing them to propagate beyond the horizon for intercontinental communication. Aviation, maritime operations, and amateur radio operators rely heavily on this band for long-distance links when satellite systems fail.
Heard on the job
We lost the satellite feed, so switch over to the HF rig and try to raise base camp on 14 megahertz.
Also heard as
- high frequency
Do not mix it up with
- VHF: VHF is higher in frequency and generally limited to line-of-sight propagation, unlike HF which can bounce off the ionosphere.