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Italian inventor sent and received radio signals (although, there is a possibility that he didn't) which could've been anything from a telegraph or a simple radio wave
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allowed radio to be played in the car or anywhere. it is used to absorb radio waves and amplify them into actual audio signals which can be heard. Lee De Forest borrowed the idea.
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used spark gap technology to jump the gap from land to sea. His more famous contribution was for the titaanic in which he saved a bucnh of lives from death
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Did the first continuous broadcast from Tufts university it lasted for 3 hours using the 1XE and became the first to broadcast on a regular schedule
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After 25 years since the first radio signals were sent and received (1920). Frank Conrad created the first radio station. 8XK renamed to KDKA, which is still atound to this day
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Radio stations have always made money from ad's. In 1922 WEAF introduced the first ad in radio history. It ran a 10 minute ad charging $5 per minute.
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The National broadcast Company began regular broadcasting in 1926 with links to New York and other eastern cities. It became th dominate radio broadcasting station
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Thanks to Uncle Charlie's (personal radio stations) in order to organize everything the Frc which later turned to the FCC enforced radio communication
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The Columbian Broadcasting system began in 1927 under the guidance William S. Paley
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Nine regional radio stations. In order to control the massive amount of radio stations growing Germany created ARC in order to control techinical problems.
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In, 1962 Philips made the first compact cassette medium for audio storage
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Am Radio began to decline in popularity and amount due to FM having a lower cost and FM radio having clearer sound, also
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Began offering RDS which provides text information about programs that were being broadcasted as well as traffic alerts, accurate time, and other teletxt information
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The Broadcasting act Marked an radio authority and a TV comission to monitor all non BBC channels in Britain