1921 in radio
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1921 in radio details the internationally significant events in radio broadcasting for the year 1921.
- 2 January: The first religious broadcast is made by Dr. E. J. Van Etten of Calvary Episcopal Church on the Pittsburgh station KDKA.
- 3 January: The first vocal weather forecast is made by station 9XM (now WHA), at the University of Wisconsin, Madison. They had been broadcasting Morse code weather bulletins since 1917.
- 18 February: Warren G. Harding becomes the first U.S. president-elect to be heard on radio when he makes an appearance on KDKA.
- 4 March: The first Presidential inauguration is broadcast from Washington, D.C., by KDKA.
- 10 March: The first broadcast of live opera/theater in history is on the air from KDKA at Pittsburgh's Davis Theater.
- 11 April: The world's first ever sports broadcast is made on KDKA by Florent Gibson of the Pittsburgh Star newspaper. The commentary is of a fight between Johnny Ray and Johnny Dundee at Motor Square Garden in Pittsburgh.
- 2 July: The first broadcast of a World Heavyweight bout is on the air from Jersey City, New Jersey, via KDKA.
- 5 August: The first broadcast of a baseball game is on the air from KDKA as the Pittsburgh Pirates defeat the Philadelphia Phillies 8–5 at Forbes Field.
- 20 September: The first "news room" and "news department" in broadcast history is created by KDKA and the Pittsburgh Post-Gazette.
- 8 October: The first broadcast of American football is on the air via KDKA as the University of Pittsburgh defeats West Virginia University at Pittsburgh's Forbes Field.
- 27 November: U.S. bandleader Vincent Lopez & group begins a weekly 90-minute music show on Westinghouse-owned station WJZ in Newark, New Jersey (later WABC New York).
- February: WQAM is launched in Miami, Florida by the W.W. Luce of the Electrical Equipment Company.
- 26 July: Experimental station 8ACS (later WHK) is launched in Cleveland, Ohio, by Warren C. Cox/Cox Mfg. Co.
- 19 September: The first commercially-licensed radio broadcasting station in the United States, WBZ, is launched by the Westinghouse Electric Corporation in Springfield, Massachusetts.
- 1 October: WJZ is launched by Westinghouse in Newark, New Jersey.
- 11 November: KYW is launched by Westinghouse in Chicago.
- 19 July: Harold Camping, American religious broadcaster
- 19 October: Bern Bennett, American radio and television announcer
- The Shell Book of Firsts, 1983. p. 200
- The Shell Book of Firsts, 1983. p. 149
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