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Nikola Tesla experimentally demonstrted the transmission and radiation of radiofrequnecy energy.
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Marconi built a wireless system capable of transmitting signals long distances.
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Reginald made a waek transmisson of voice over the airwaves.
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On March 22, 1902, Cervera founded the Spanish Wireless Telegraph and Telephone Corporation and brought to his corporation the patents he had obtained in Spain, Belgium, Germany and England.
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In April 1909 Charles David Herrold, an electronics instructor in San Jose, California constructed a broadcasting station. It used spark gap technology, but modulated the carrier frequency with the human voice, and later music.
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Harold Power with his radio company American Radio and Research Company (AMRAD), broadcast the first continuous broadcast in the world from Tufts University under the call sign 1XE (it lasted 3 hours).
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The most common type of receiver before vacuum tubes was the crystal set, although some early radios used some type of amplification through electric current or battery. Inventions of the triode amplifier, motor-generator, and detector enabled audio radio.
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During the mid-1920s, amplifying vacuum tubes revolutionized radio receivers and transmitters. John Ambrose Fleming developed an earlier tube.
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“Queen of the Blues” Bessie Smith records her first song, “Down Hearted Blues,” which becomes an immediate success.
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Jazz composer Duke Ellington writes “It Don't Mean a Thing, If It Ain't Got That Swing,” a song that presaged the swing era of the 1930s and 1940s.
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The radios established comercial modes this is important because that's how radio made money
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Euro dance band Milli Vanilli admits to lip-synching hits such as "Girl You Know Its True," and has its Grammy award revoked.
