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He had signals over a distance of about 2 kilometers
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The coherer is an item used to detect radio waves
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Marconi gave his first public demonstrations, in the summer of 1897 Marconi set up a link spanning the 14 kilometers
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in the spring of 1899 a first link was set up to cross the English Channel between an existing station at South Foreland in England and a station set up at Wimereux near Bologne in France.
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