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1) when referring to (radio) broadcasting, includes frequencies ranging from 1.7 to 30 MHz (1700 - 30,000 kHz), but sometimes refers also to the HF frequency spectrum from 3 to 30 MHz 2) An adjective referring technically to radio waves shorter than 80 meters, corresponding to a frequency of 3.75 megahertz or more. The term is often loosely used to refer to HF frequencies. 3) In radio [communications], pertaining to the band of frequencies [approximately] between 3 MHz and 30 MHz. Note: “Shortwave” is not a term officially recognized by the [international community].
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