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Origins of electronic media• 1842- Samuel Morse invents the  telegraph.• 1860s: James Clerk Maxwell theorizes the  existen...
The New Millennium• Spectrum is under increasing stress  vis cellphones, microwave, satellite  and other emerging media• E...
Radio & the electromagnetic         spectrum
Spectrum (1)
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Spectrum (1)

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Spectrum (1)

  1. 1. Origins of electronic media• 1842- Samuel Morse invents the telegraph.• 1860s: James Clerk Maxwell theorizes the existence of electromagnetism• 1880s: Heinrich Hertz proves the existence of the spectrum with spark-gap experiment.
  2. 2. The New Millennium• Spectrum is under increasing stress vis cellphones, microwave, satellite and other emerging media• E.g., today there are over 219 million U.S. wireless phone subscribers• There are more wireless phones than landlines in the United States today• POBs (plain old b-cast services) are also making greater demands on spectrum
  3. 3. Radio & the electromagnetic spectrum

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