www.microwavejournal.com/articles/33986-the-rebirth-of-hf

The Rebirth of HF
May 15, 2020
HF stands for “high frequency” and is usually used to refer to signals with frequencies in the range of 3 MHz to 30 MHz, although in many cases the practical definition of HF has be extended down to frequencies as low as 1.5 MHz.
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