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(1890 - 1954) 
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Edwin Armstrong is the father of the FM radio and could be considered the grandfather of radar. In 1912, Armstrong redesigned the radio tube by having the electromagnetic waves go back through the tube over and over to increase the power. This process was called regeneration. He discovered that at a certain level. The tube generated its own waves and became a transmitter.
During World War II, Armstrong showed that by using FM waves to transmit messages, the enemy could not jam the signals. He eventually bounced a signal to the moon and back proving that FM waves could go through the ionosphere. Today, scientists use radio waves to measure vast distances in space. |