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In 1920, the United States had the first commercial radio broadcast of speech and music. In the late 1930's, all radio stations were AM. The combination of radio and satellite has solved the problems of mathematics and science. Radio navigation systems have been used since the 1940's. Radio signals from space are faint because they need to be amplified by large radio dish antennae...

Radio navigation systems have been used since the 1940's. Radio signals from space are faint because they need to be amplified by large radio dish antennae. The first sounds transmitted from outer space were "beeps" from the Russian Sputnik on October 4, 1957.The electronic circuitry on the satellite is called a transponder...

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