Keywords: WWVNBSRadioStation 001.jpg During the spring of 1920 the Radio Section broadcasted music over station WWV in advance of the scheduled commerical broadcasts later in the year A Victrola phonograph was the source of the music with pickup by a microphone using a telephone transmitter fitted with a morning glory horn US Army Signal Corps radio equipment served as the transmitter National Institute of Standards and Technology 1920-01-01 National Institute of Standards and Technology PD-USGov-NIST PD-USGov National Bureau of Standards WWV Radio waves Time and frequency standards Radio transmitters Vacuum tube devices Phonograph cranks |