radio

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					By:
Nanticha, Mark, Aneka,
Emmanuel JR, Miles Luke, Alok
                 Radio
 Entertainment.
 News

 Weather report

 Electrical machine with
  sound.
 Transmission of signals

   Electromagnetic waves
    with frequencies below
    visible light
                First Radio
   1895
   Marchese
    Guglielmo Marconi
               AM Radio
   1906
   Reginald Aubrey
    Fessenden
   AM comes from
    Amplitude
    Modulation
   Transmits on
    ground wavebands
            Shortwave Radio
   1921
   Conrad
   Alternate name is
    high frequency
    radio or HF.
               FM Radio
   1931
   Edwin Howard
    Armstrong.
   FM comes from
    Frequency
    Modulation
   FM is on air.
               Digital Radio
   2000
   XM Satellite Radio
    Holdings
Different Types of Radios
How Radio works?
                Radio Parts
 Antennas
 Transmitter

 Receiver

    The handmade radio
       How Does Radio Work?
   Transmits radio
    waves by the
    transmitter.
   Receives radio
    waves on by the
    receiver.
   Both uses the
    antenna.
                      Radio Waves
   Headphone could
    be used.
Radio Parts
           References
 www.history.sandiego.edu/GEN/reco
  rding/radio.html
 www.google.com

 www.wikipedia.org

 www.wiki.answers.com

 www.infobankofindia.com
Thank you

				
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posted:3/28/2011
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