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hello and welcome to this presentation understanding hf propagation in this presentation will introduce you to the basic concepts of hf propagation and explain how hf propagation is influenced by solar activity H F stands for high frequency and is usually used to refer to frequencies in the range of three megahertz to thirty megahertz although in many cases the practical definition of HF can be extended down as low as one point five megahertz this corresponds to wavelengths in the range of about a hundred meters to about ten meters youll sometimes also hear HF referred to albeit somewhat imprecisely as shortwave the primary use of HF is for long distance or even global communications broadcasters can docHub listeners around the world using HF and this global docHub is also useful in many government and military applications amateur radio operators around the world also frequently use an experiment with HF and as well see in this presentation its the unique properties of hf propagation