FM Radio
Edwin Howard Armstrong was only 11 years old when Guglielmo Marconi made the first wireless trans-Atlantic radio transmission. His fascination with this feat set Armstrong on a life course of invention and discovery. While working at Columbia University he invented the frequency-modulated or FM radio in 1933, which controlled noise static caused by electrical equipment and the earth’s atmosphere. Armstrong also invented the regenerative or feedback circuit, which fed the radio signal through a radio tube some 20,000 times per second. This greatly increased the range of radio signals. He also invented the “superheterodyne tuner” that allowed people to tune into multiple radio stations.
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