4 March – Text of the speech, given at the U.S. Presidential inauguration in Washington, D.C. by Warren G. Harding, is read over KDKA in Pittsburgh, Pennsylvania.[2]
19 September – First commercially licensed radio broadcasting station in the United States, WBZ, is launched by the Westinghouse Electric Corporation in Springfield, Massachusetts. It is the first broadcasting station to receive a license that explicitly specified operation on the 360 meter (833 kHz) wavelength formally assigned to the broadcasting service by regulations which became effective 1 December 1921.
20 September – KDKA and the Pittsburgh Post create the first "news room" and "news department".[4]
25 September – The wireless telegraph station in Sofia makes the first public radio broadcast in Bulgaria: the retransmission of a concert from the German station at Nauen.
1 December – Effective date, in the U.S., for the first formal establishment of a broadcasting station service. (Limited Commercial license, for operation on 360 (833 kHz) and/or 485 (419) meters.)[8]
24 December – First public radio broadcast from the Eiffel Tower in Paris.[9]
^It Started Hear (1970) page 16. "A copy of the Harding text was obtained in advance and read on the air while the new President was speaking in Washington."
^Balle, Francis (2020). Les médias: «Que sais-je?». Vol. 3694. Presses universitaires de France. p. PT17. ISBN9782715403123.
^DeLong, Thomas A. (1996). Radio Stars: An Illustrated Biographical Dictionary of 953 Performers, 1920 through 1960. McFarland & Company, Inc. ISBN978-0-7864-2834-2. p. 235.