-
proved physical existence and showed how radio waves exist mathematically.
-
marconi was a italian inventor. He also sent an received first radio signal in 1895
-
was able to send messages/radio waves across the atlantic.
-
Lee De Forest created (or "borrowed" the idea) the audion tube which is a vacuum tube that increases the volume or amplified signals.
-
de Forest built an amplifier using two devices.
-
station in Pittsburg, Pennsylvania. one of the first stations to have music and comercials/talking.
-
WEAF aires a 10 minute 'commercial' for an apartment complex charging $50
-
transmitters had to be license. station frequencies, power limits, and call letters were assigned.
-
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
-
FM radio was discovered and approved
-
wireless radio using satellites idea
-
the USSR (russia) launched the 1st satellite into orbit. which proved satellites could successfully be put into orbit.
