High Quality Content by WIKIPEDIA articles! Skywave is the propagation of electromagnetic waves bent (refracted) back to the Earth's surface by the ionosphere. As a result of skywave propagation, a broadcast signal from a distant AM broadcasting station at night, or from a shortwave radio station (or during sporadic E season, a low band TV station) can sometimes be heard as clearly as local stations. (This is distinct from "groundwave" propagation, which is direct from transmitter to radio)....
High Quality Content by WIKIPEDIA articles! Skywave is the propagation of electromagnetic waves bent (refracted) back to the Earth's surface by the ionosphere. As a result of skywave propagation, a broadcast signal from a distant AM broadcasting station at night, or from a shortwave radio station (or during sporadic E season, a low band TV station) can sometimes be heard as clearly as local stations. (This is distinct from "groundwave" propagation, which is direct from transmitter to radio). Most long-distance HF radio communication (between 3 and 30 MHz) is a result of skywave propagation. Since the early 1920s amateur radio operators, limited to lower transmitter power than commercial radio, have taken advantage of skywave for long distance or DX communication.
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Сергей Малозёмов — известный телеведущий, дипломированный врач, автор и ведущий научно-популярных программ телеканала НТВ - "Чудо техники" и "Еда живая и мёртвая".Вы узнаете, как питаются долгожители в разных странах — и то, как удивительным образом это совпадает со стилем питания современных светил мировой науки. Какие продукты "мертвы", а какие "живы"? То, о чём говорится в этой книге, уже помогло...
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