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Radio Signal?
In 1895, Marconi, an Italian inventor, sent and received the first radio signal. -
Audion Tube
Lee De Forest created or "borrowed" the idea for the audion tube which amplified signals. -
Reginald Fessenden
It is believed Reginald Fessenden, a Canadian Inventor, actually came up with the idea, but didn't seem to make it to the history books. -
Radio Stations
In 1920 radio stations started to make an appearance in the radio world. Frank Conrad invented 8XK which is now known as KDKA and is still around in Pittsburg, Pennsylvania. -
Dawn of Advertising
In 1922, WEAF aired a 10 minute commercial or toll broadcast, for an apartment complex charging $50. -
Federal Radio Commission
FRC was established in 1927. The FRC organized the licensing of transmitters and assigned radio station frequencies, call letters, and power limits. -
Call Letters
W is the East of the Mississippi River
K is the West of the Mississippi River -
AM Waves
Amplitude Modulation
Modulation means to change the waves. -
FM Waves
Frequency Modulation -
Golden Era
The 30s and 40s was the time of the Great Depression. At this time, radio provided distraction from the real world problems. -
Radio shows to TV
TV appeared in the late 30s. Advertisers went to TV to try and make more money. This caused radio to lose money, and radio shows eventually ended. -
Radios played Music
Major Edwin Armstrong invented the FM transmitter, which made a stronger signal and higher quality sound. The government made listeners buy new radio sets
