23 February 2022 presentation by Frank Donovan W3LPL

Highlighting the evolution of transoceanic radio communications technology that paved the way for radio communications as we know it today. Including:

  • Early years and key discoveries, from Maxwell's mathematical prediction that electromagnetic waves exist and could travel through space (1864), to the development of wireless transmitters, receivers and antennas using electrical (not electronic) technology (1890-1920), to the discovery of the electron (1897) and the development of regenerative and superhetorodyne receivers,
  • Transatlantic high power VLF transmitting and receiving stations (1907) and ARRL's Transatlantic Test on the "short waves" (1921)
  • Development of increasingly sophisticated HF modulations, transmitters, receivers and antennas (1920s) that laid the groundwork for the U.S. Navy's global military communications satellite systems in the 1970s


Available for download: