CentralNotice WJSV broadcast day From Wikipedia, the free encyclopedia Jump to navigation Jump to search Audio recording WJSV broadcast day Entrance to the Warner Building , formerly known as the Earle Building, and in 1939 the location of the WJSV studios in Washington, D.C. Genre Radio programs Running time 19 hours Home station CBS Radio Hosted by WJSV radio station Recording studio 817 Earle Building, 13th and E Streets, NW, Washington, DC Original release September 21, 1939 ( 1939-09-21 ) – present On September 21, 1939 radio station WJSV in Washington, D.C. made an audio recording of its entire 19-hour broadcast day. This undertaking was a collaboration between the station and the National Archives , and it was the first time that such a comprehensive recording of a radio broadcast had been made. The station then donated its original set of recording discs to th...