History of Radio and TV

By holmanisa
  • 1920 BCE

    First college broadcast

    First college broadcast
    first college radio station began broadcasting on October 14, from Union College, Schenectady, New York

  • First experiment with wireless telegraph

    First experiment with wireless telegraph
    Heinrich Rudolf Hertz was able to conclusively prove transmitted airborne electromagnetic waves in an experiment confirming Maxwell's theory of electromagnetism. finding that he can control them and they can go through free space.

  • Human voice transmitted wireless

    Human voice transmitted wireless
    Brazilian priest Roberto Landell de Moura transmitted the human voice wireless for a distance of approximately a half mile. knowing that his invention had real value, he left Brazil for the United States with the intent of patenting the machine in the US.

  • First radio program broadcast

    First radio program broadcast
    Reginald Fessenden used a synchronous rotary-spark transmitter for the first ra dio program broadcast, from Ocean Bluff-Brant Rock, Massachusetts. Ships at sea heard a broadcast that included Fessenden playing O Holy Night on the violin and reading a passage from the Bible.

  • First radio factory

    First radio factory
    Marconi opened the world's first purpose-built radio factory at New Street Works in Chelmsford, England.

  • First continuous radio broadcast

    First continuous radio broadcast
    Harold Power with his radio company American Radio and Research Company, broadcast the first continuous broadcast in the world from Tufts University.

  • amplifying vacuum tubes

    amplifying vacuum tubes
    amplifying vacuum tubes (or thermionic valves in the UK) revolutionized radio receivers and transmitters. John Ambrose Fleming developed a vacuum tube diode. Lee de Forest placed a screen, added a "grid" electrode, creating the triode.

  • The pocket transistor radio

    The pocket transistor radio
    the Regency company introduced a pocket transistor radio, the TR-1, powered by a "standard 22.5 V Battery.".

  • Colored TV

    Colored TV
    color television was being broadcast commercially and the first radio communication satellite, Telstar, was launched. In the late 1960s

  • Software-defined radio

    Software-defined radio
    U.S. Army and DARPA launched an aggressive, successful project to construct a software-defined radio that can be programmed to be virtually any radio by changing its software program.