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Ground wave

Radio wave propagating over the surface of the Earth. Ground wave propagation is affected by either or both of the electrical parameters of the ground and objects located on the Earth's surface as well as by its cover.


Guard interval

Time interval, which is used to ensure that distinct transmissions do not interfere with one another. The purpose of the guard interval is to introduce immunity to propagation delays, echoes and reflections, to which digital data is normally very sensitive.