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Radio Radio Presentation Transcript

  • Radio
    • SPARK
    • 1895 by Marconi
    • AM
    • 1906 by Fessenden
    • 1921 by Conrad
    • FM
    • 1931 by Armstrong
    • 2000 by XM
    • Edison ( 1875 )
    • Towards the end of 1875, while experimenting with the telegraph , Thomas Edison noted a phenomenon that he termed " etheric force " , announcing it to the press on November 28 . He abandoned this research when Elihu Thomson , among others, ridiculed the idea . The idea was not based on the electromagnetic waves described by Maxwell .
    • David E . Hughes
    • In 1878, David E. Hughes was the first to claim to have transmitted and received radio waves when he noticed that his induction balance caused noise in the receiver of his homemade telephone . He demonstrated his discovery to the Royal Society in 1880 but was told it was merely induction . His aim was not to communicate by radio and his equipment was not designed to do so .
    • Calzecchi - Onesti
    • In 1884, Temistocle Calzecchi - Onesti at Fermo in Italy invented a primitive device that responded to radio waves . It consisted of a tube filled with iron filings, called a " coherer ". This device was a critical discovery because it would later be developed to become the first practical radio detector .
  • Golden Age of Radio 1935-50
    • 1935 - Radio became the " central medium " of Depression America; 2 of 3 homes had radio sets, the 4 national and 20 regional networks provided programs everywhere in America 24 hours a day, advertising agencies shifted money from newspapers to radio as public trust in print media declined but grew stronger in radio .
    • 1940 - Radio News reached maturity with regular reports of the bombing of London by Edward R. Murrow , his " London After Dark " series broadcast by shortwave; William L . Shirer reported the fall of France and the dramatic surrender at Compaigne . In the November election, FDR's radio skill helped him defeat Wendell Willkie and win an unprecedented third term as President . Music remained the dominant content of redio, occupying 50% of all programming . A federal court had allowed radio stations to play records without the prior consent of artists or music companies, and ASCAP raised its rates . When some radio stations refused, and signed contracts with the new BMI, ASCAP arranged for compromise rates .
    • 1950 - 40 million American homes owned radio sets ( 94% of all households ) , up from the 30 million in 1942 ( 84% ) and the 20 million in 1934 ( 65% ).
  • What do we use radio for
    • Now, the radio is in the car and people that have to drive a car they always turn on the radio and listen to music from it so, radio make us relax and know news. We think nobody has never listen to the radio.