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Hertz detected and produced radio waves.
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Marconi was an Italian inventor. He sent and received the first radio signal. We don't know for sure if he was the first to actually do it due to no copyright laws back then.
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Poulsen patents an arc transmission that generates continuous radio waves, producing a frequency of 100kHz and receivable over 150 miles.
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Marconi invents the directional radio antennae.
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Lee De Forest created (or "borrowed" the idea for) the audio tube, a vacuum tube that amplified signals. It is believed that Reginald Fessenden was the original person to come up with this idea but he didn't seem to make it into the history books.
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Armstrong patents a radio receiver circuit with positive feedback.
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Shortwave radio was developed. RCA is also founded.
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The first radio station was 8XK but later renamed KDKA. This station was created by Frank Conrad. This station is still around today and it is broadcasted out of Pittsburg, Pennsylvania.
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The American Radio League establishes contact via a shortwave radio with Paul Godley in Scotland, proving that shortwave radio can be used for long distance communication.RCA also started operating Radio Central in Long Island.
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Advertising is what allowed different stations to make money. It also costed them money but they earned a lot more. WEAF aired a commercial that was ten minutes long about an apartment complex, this costed $50 to do, meaning it was $5 a minute.
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FRC was established in 1927 due to Uncle Charlie had becoming too popular. The FCR organized the licensing of transmitters. Each station was assigned it's own frequency, call letters, and power limit.
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Sony offers a miniature transistor radio. This is one of the first mass-produced consumer AM/FM radios.
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The United States radio stations begin broadcasting in stereophonic sound.
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In Europe, FM radio stations begin to use the subcarrier signal of FM radio to transmit digital data.
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In the US, FM radio stations begin to use the RDS already in place in Europe.
