In the 1920s, radio in the United States was in its infancy. Only two decades earlier, in Decemher 1901, Guglielmo Marconi had successfully transmitted and received wireless signals across the Atlantic Ocean. Since then, equipment and techniques had been improved-mainly for military or maritime safety uses such as communication with ships at sea. Most early efforts involved wireless telegraphy, transmitting Morse Code by radio signals. Some experimenters, however, worked on wireless telephony and the transmission of the human voice.
Burrows, E. L. Ted
"A "Super-Powered" Goodwill Ambassador,"
Florida Historical Quarterly: Vol. 79:
2, Article 4.
Available at: https://stars.library.ucf.edu/fhq/vol79/iss2/4