19/04/1961 FM stereo broadcasting authorized in U.S.
AM and FM Radio As Fast As Possible
FM broadcasting in the United States began in the 1930s at the engineer and inventor Edwin Howard Armstrong's experimental station, W2XMN. The use of FM radio has been associated with higher sound quality in music radio. In the United States FM radio stations broadcast at frequencies of 87.9–107.9 MHz.
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