Radio - Making Waves In America

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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 hereÕs a more simple explanation than youÕll get from most books: Electromagnetic waves of different wavelengths are produced by the transmitter, and modulations within each wavelength are adjusted to carry ÒencodedÓ 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 Òregular 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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