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Italian inventor Marconi sent and recieved the first radio signal. He didnt actuall say anthing just sent thea signal such as morris code.
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Profesor in london, acted as a consulted to Marconi. He new dectectors were very weak and created something to make them stronger
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Lee De Forest created( or borrowed the idea for) the Audion tube. The audion tube ia a vacuum tube that amplifies signals. It's widels believed that the canadian inventor Reginald Fessended actually came up with the idea, but Fessenden didnt seem to make it into the books for the invention
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De forest succeeded in using the triode as an amplifer after many attempts. He built the amplifer with two devices
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Armstrong developed a reciever where the incoming signal was converted down to a fixed intermediate frequency. There is can be amplified and filtered
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This was the first clear transmission of human speech. Adter experimenting many times.
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The first radio station was 8xk later names KDKA. Frank Conrad was the speaker. The radio station has been around for 93 years broad casting out of pittsburg pennsylvania.
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In 1922 WEAF aired a 10 minute comercial or toll broadcast. THe did this from an apartment and charged $50.
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This was estblashed because uncle charlie was too popular. Established 1927. It organized the licensing of transmitters. They also assigned station frequencies, call letters, and power limits.
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This was the middle of the great depression when listening to the radio was considered a "escape". People were tight on money but havining a radio was essential. The radio was also a family medium, everybody could listen together.
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New wave lengths were set un in europe at the time of the war. GIven a few medium frequencies
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As popularity grew towards tv so did advertising. Advertisers thought it was smarter to show the views the product rather for them to just hear it. So when the money went to tv radio started to downfall.
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Janet Jackson becomes the highest-paid musician in history when she signs an $80-million deal with Virgin Records.
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Apple Computer introduces Apple iTunes Music Store, which allows people to download songs for 99 cents each.
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Michael Jackson, the pop icon, dies suddenly in Los Angeles, California, on June 25, 2009, of cardiac arrest. His death stunned fans around the world. He had been set to embark on a comeback tour at the time of his death.
