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Hertz discovers radio waves
proved physical existence and showed how radio waves exist mathematically. -
invention of radio
marconi was a italian inventor. He also sent an received first radio signal in 1895 -
First transatlantic transmission
was able to send messages/radio waves across the atlantic. -
audion tube
Lee De Forest created (or "borrowed" the idea) the audion tube which is a vacuum tube that increases the volume or amplified signals. -
The triode used as an amplifier
de Forest built an amplifier using two devices. -
KDKA
station in Pittsburg, Pennsylvania. one of the first stations to have music and comercials/talking. -
begin of advertising
WEAF aires a 10 minute 'commercial' for an apartment complex charging $50 -
Federal Communications Commision
transmitters had to be license. station frequencies, power limits, and call letters were assigned. -
middle of great depression
during the 1940's/30's, radio provided an "escape" to people during the great depression/war and people would often save up to buy a radio rather than initial needs -
Frequency Modulation
FM radio was discovered and approved -
Arthur C Clarke proposes geostationary satellites
wireless radio using satellites idea -
Sputnik 1 launched
the USSR (russia) launched the 1st satellite into orbit. which proved satellites could successfully be put into orbit.
