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Radio History Timeline

By Nm221669

  • Hertzian waves

    Hertzian waves
    Heinrich Rudolf Hertz was the first scientist who was able to transmit electromagnetic waves through the air. Also known as radio waves. He proved Maxwells electromagnetic theory

  • Marconi

    Marconi
    Guglielmo Marconi was a young italian inventor. He started building a commercial wireless telegraphy system using Hertzian waves. He raised his antenna and made other changes and made the distance of the transmitter go farther.

  • Reginald Fessenden

    Reginald Fessenden
    Reginald Fessenden used an Alexander alternator and rotary spark gap transmitter to make the first radio audio broadcast. Happened in Brant Rock, Massachusetts. He sent a broadcast of him playing the violin to ships.

  • San Jose Calling

    San Jose Calling
    Charles David Herrold, an electronics instructor in San Jose, California constructed a broadcasting station. Used spark gap technology but modulated the carrier frequency with a human voice and later music. Later became was is known today as KCBS.

  • AMRAD

    AMRAD
    Harold J. Power and his radio company broadcasts the first continual in the world from Tufts university. The broadcast laster 3 hours. Company later became first to broadcast on a daily schedule and to broadcast radio dance programs, university professor lectures, the weather, and bedtime stories.

  • Crystal Sets

    Crystal Sets
    Most common type of receiver before vacuum tubes. Still pursued as a hobby to use these type of recievers. As the only energy available is by the antenna system, loudness is necessarily limited.

  • first publicly targeted licensed radio station in the U.S

    first publicly targeted licensed radio station in the U.S
    It is to known as KDKA in Pittsburg, Pennsylvania. October 1920 got its license and went on the air as the first US licensed commercial broadcasting station and on November 2, 1920 with the presidential election results

  • FM and television start

    FM and television start
    Edwin Armstrong an inventor started FM in 1933. The first experimental FM radio station wasn't until 1937 by W1XOJ. It was granted by a construction permit by the US Federal Communications Commission.

  • pocket transistor radio

    pocket transistor radio
    Regency introduced this transistor in 1954. It was powered by a standard 22.5V Battery.

  • First transitorized radio

    First transitorized radio
    In 1955, the newly formed Sony company introduced its first transistorized radio. It was small enough to fit in a vest pocket.