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Hertz proved that electtricity can be transmitted in electromagnetic waves. He conducted experiments in sending and receiving these waves.
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Guglielmo Marconi built a wireless system capable of transmitting signals at long distances.
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The Audion Tube was an electronic amplifying vacuum tube invented by Lee De Forest. It was the first triode, consisting of a partially evacuated glass tube containing three electrodes; a heated filament, a grid, and a plate.
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A crowd cheered for Marconi in New York City a few days after the titanic. In the Titanic radio room or known as Marconi's Wireless room sent out distress signals soon after the ship hit the iceberg. These wireless signals sent saved many lives
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These radios used a piece of leadgalena crystal and a cat whisker to find signal. Crystal radios made it easier for everyone to have one because they were easy to make at home.
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You could make your own radio station if you have the equipment and it was called a "Uncle Charlie"
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KDKA was the first radio station invented. They chose this date because it was election day. They told the results on the station and KDKA also played the first commercial.
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Detroit police radio car with antennas running across the roofs.
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Annie was orginally a 15 minute radio show that debuted on WGN Chicago in 1930. It went national on NBC's Blue Network in 1931.
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FM stands for freqency modulation. It was invented by Edwin H. Armstrong. He demonstrated FM broadcasting in a long-distance relay network, via five stations in five states.
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Sony introduced their first transistorized radio, small enough to fit in a vest pocket, and able to be powered by a small battery. It was durable because it had no tubes to burn out.
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The GPS constellation of satellites was lauched.
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In the 2000s the digital radio was introduced to the world.
