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Transcript of Radio
"Most of the models of entertainment...
were formed by radio"
James Clerk Maxwell
predicts the existence of
...the first wireless technology
__ _ ___ _ ___
Lee Fleming discovers
the vacuum tube
Lee Deforest patents the Audion tube
Lee Deforest first
broadcasts voice over
What was the first historical event to utilize wireless technology?
Titanic receives radio warning of icebergs
Radios mayday for help, everyone asleep
Leads to the radio act of 1912 -
Ship transmissions must be kept separate from amateur
David Sarnoff proposes radio boxes for the home
U.S. Govt takes over radio operation
GE also develops an alternator to help improve long-distance wireless.
Edwin Armstrong discovers "regeneration" --- a feedback loop that improves the signal strength of radio broadcasts.
KDKA in Pitsburgh, PA gives first radio station broadcast.
By 1923 over 600 station
licenses are given out.
Edwin Armstrong invents first portable radio.
NBC News is first network news on radio
(NBC Red Network)
NBC transmits as Lindberg returns home.
Why was Lindbergh's flight historic?
Radio Act of 1927
Radio belongs to people
could only be used
with a license
Federal Radio Commission
Edwin Armstrong introduces FM -
created by congress
Act of 1934
Networks can air news
FDR gives radio address after
Edwin Armstrong gives all patents to
for use during
The problems with
After World War II, FCC moves FM to a different spectrum
THIS makes all pre-war radios obsolete
With TV on the horizon
doesn't find footing
except with noncommercial radio
only 25% listened to FM
more than 75% listened to FM
By this decade, more than
radio sets and
Satellite RADIO starts with XM
2008 XM merges with SIRIUS
what is the future of radio?
19.5 Million Subscribers
Source: Nobel Lectures, Physics 1901-1921, Elsevier Publishing Company, Amsterdam, 1967, Retrieved from http://www.nobelprize.org/nobel_prizes/physics/laureates/1909/marconi-bio.html
Source: http://www.cedmagic.com/history/deforest-audion.html; Retrieved 08-28-13
Source: Screen Junkies. "Honest Trailers: Titanic" Retrieved 08-28-13 from youtube
Public Broadcasting Act of
Gives birth to
American Public Radio
Eventually becomes PRI
ACT of 1996