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1917 __ 9XM
Earle Melvin Terry (1879-1929)
Comment : 9XM, the call letters for the University of Wisconsin in Madison, experiments with voice and music transmissions. Constructed by Edward Bennet and Earle Melvin Terry in 1909, it is not exacty known when the station converted from telegraphy to telephony and then radio. It later became WHA. (Barry Mishkind, “The Broadcast Archives”, www.oldradio.com)Earle Melvin Terry helped found 9XM Madison, Wis., now WHA, still calling itself 'the nation's oldest broadcast station.' Earle Terry, a professor of physics at the University of Wisconsin, inspired C. J. Jansky Jr., a student, to design and construct three-element power vacuum tubes to be used in an already established experimental radio-telegraph station (started in 1914 with 2000 watts of power on 475 meters), in operation in Wisconsin's old Science Hall and licensed under the call letters 9XM. The station achieved its first transmissions of voice and music in 1917 under the direction of Professor Terry and with the devoted efforts of such university students as Mr. Jansky, Malcolm Hanson and Grover Greenslade. On Jan. 3, 1919, daily radio-telephone broadcasts of weather reports were started. C. M. Jansky Jr., the son of a professor of electrical engineering at the University of Wisconsin, went on to become an international authority on radio engineering and still is associated with Jansky and Bailey Inc., Washington, consulting engineers. Malcolm Hanson, another of Professor Terry's precocious students, was later chief radio operator on Admiral Richard E. Byrd's first expedition of Antarctica. (“Many Claims Have Been Made, But Radio's Paternity Is Still a Question”, Broadcasting, Nov. 2, 1970)
Urls : http://www.nrcdxas.org/articles/who1st.txt (last visited ) http://www.oldradio.com/ (last visited )

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