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Unformatted text preview: o wireless experiements began in 1800s o electromagnetic waves aka: “ether” waves are capable of carrying information 2. Early Inventors and Theorist-James Clerk Maxwell theories o Theorized that electromagnetic waves exist-Heinrich Hertz o Applied Maxwell’s theories -Marconi’s wireless experiments -Reginald Fessenden’s 1906 “broadcasts”-Lee deForest’s audion tube o Often took credit for other inventors’ work-Edwin Armstrong o 3 major inventions [will be on exam] Superheterodyne (GOOGLE) Regenerative circuits FM radio (1930s)-David Sarnoff o Creator of NBC (National Broadcast Company) NBC broadcasted in 54 stations in 24 states ((Also, we have been watching “Empire of the Air”—there is a worksheet that accompanies the movie))...
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- Spring '07
- electromagnetic waves, National Broadcast Company, Electric communication devices, public education magazines, Clerk Maxwell theories