Radio - Making Waves In America


Radio: Making Waves in America
Radio-wave technology is one of the most important technologies used by man. It has forever changed the United States and the world, and will continue to do so in the future. Radio has been a communications medium, a recreational device, and many other things to us. When British physicist James Clerk Maxwell published his theory of electromagnetic waves in 1873, he probably never could have envisioned the sorts of things that would come of such a principle. His theory mainly had to do with light waves, but fifteen years later, a German physicist named Heinrich Hertz was able to electrically generate MaxwellŐs ŇraysÓ in his lab. The discovery of these ...

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a better radio wave detector or cohere and connected it to an early type of antenna. With the help of his brothers and some of the neighborhood boys he was able to send wireless telegraph messages over short distances. By 1899 he had established a wireless communications link between England and France that had the ability to operate under any weather conditions. He had sent trans-Atlantic messages by late 1901, and later won the Nobel prize for physics in 1909.
Radio works in a very complicated way, but hereŐs a more simple explanation than youŐll get from most books: Electromagnetic waves of different wavelengths are produced by the transmitter, and modulations within each wavelength are adjusted to carry ŇencodedÓ information. The receiver, tuned to read the frequency the transmitter is sending on, then takes the encoded information (carried within the wave modulations), and translates it back into the sensory input originally transmitted. Many of the men who pioneered radio ...

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once mass-production began on public-model radios around the late 1910s and early Ô20s. As its popularity increased, commercial radio began to take off. Radio KOW in San Jose Ca. was the first commercial broadcast station to begin Ňregular programming as early as 1912.Ó The station recognized as the first successful commercial broadcaster was KDKA in Pittsburgh Pennsylvania, going on the air in 1920 with the results of the presidential race between Harding and Cox. Their success led to the rapid growth of radio over the next two years, resulting in over 500 licensed stations by the end of 1922.
Around the 1970s microcircuits replaced printed circuits. Plastics were put to use in the ...

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Added: 9/29/2005 12:46:59 AM
Category: Technology
Type: Premium Paper
Words: 1502
Pages: 6

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