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An italian inventor was sent to the first radio signal even though he wasn't REALLY the first.
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A audion tube is a vaccum tube that amplified the signals.Lee De Forest, created/borrowed the idea of the audion tube.
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amplitude modulations is the modulation of a wave by varying its amplitude. Used for mainly radio broadcasting.
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Reginald Fessenden made the first to transmit a program of speech/music.
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In present day you can't have your own station unless you have the money to actually own a station back then everyone wanted a personal station.
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Radio makes money out of commercials and sells advertisements again and again to make money. Also airing an advertisement is very expensive so they need tons of money.
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Stations need call letters because they can't used the frequencies again. The letters depend on the location your station is.
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Personal Startions were geting too popular.So they established Federal Radio Commission(FRC) in 1927.Organized the licensing of transmitters and assigning radio station frequencies, call letters, and powerlines.
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At this time, radio was at its finest point everyone listened to the radio and was around for quite a while.This happened during a war and during the Great Depression.People were getting hurt for money and radio provided an escape for people to relax and know what's going on.
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Frequency Modulation and it is 88 - 108 MHz. FM waves changes the frequency of the waves and is also mostly used in radio broadcasting. It's the frequencies and pitches heard whilst turning the radio dial.
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Family medium is used when the entire family can go listen to the radio and can enjoy it together. It is used mainly to listen to music, stories, situationa comedies and drama.
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They broadcasted a lot of famous shows.They started to broadcast shows on radios.
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In 1982 the compacted disc was created and replaced the radio because you can burn stuff onto the discs.This doesn't really replace the radio station just less people end up listening to the radio.
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MP3 was the compressed audio file format that becomes an international standard.Eventually became the most popular format for distributing digital audio over the Internet.
