Radio History

By Donvwash

  • Heinrich Hertz

    Heinrich Hertz
    Heinrich Hertz detects and produces radio waves.

  • Marchese Guglielmo

    Marchese Guglielmo
    Marchese Guglielmo Marconi builds his first radio equipment, a device that will ring a bell from 30 ft. away.

  • R.A. Fessenden

    R.A. Fessenden
    American scientist R.A. Fessenden transmists human speech via radiowaves.

  • Marcon

    Marcon
    Marconi transmits telegraphic radio messages from Cornwall to Newfoundland

  • Valdemar Poulsen

    Valdemar Poulsen
    Valdemar Poulsen patents an arc transmission that generates continuous radio waves, producing a frequency of 100 kHz and receivable over 150 miles.

  • First radio transmission of music

    First radio transmission of music
    First radio transmission of music at Graz, Austria.

  • Edwin Armstrong

    Edwin Armstrong
    Edwin Armstrong patents a radio receiver circuit with positive feedback. Part of the amplified high-frequency signal is fed back to the tuning circuit to enhance selectivity and sensitivity.