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.
3. 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
