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Hertz
was a German physicist who first conclusively proved the existence of electromagnetic waves theorized by James Clerk Maxwell's electromagnetic theory of light. Hertz proved the theory by engineering instruments to transmit and receive radio pulses using experimental procedures that ruled out all other known wireless phenomena. The unit of frequency – cycle per second – was named the "hertz" in his honor. -
Marconni
he SS Philadelphia sailed west from Great Britain with Marconi aboard, carefully recording signals sent daily from the Poldhu station. The test results produced coherer-tape reception up to 1,550 miles (2,490 km), and audio reception up to 2,100 miles (3,400 km). The maximum distances were achieved at night, and these tests were the first to show that for mediumwave and longwave transmissions, radio signals travel much farther at night than in the day. During the daytime, signals had only been r -
Audion Tube
nvented by American electrical engineer Lee De Forest in 1906.It was the first triode, consisting of a partially evacuated glass tube containing three electrodes; a heated filament, a grid, and a plate.It is important in the history of technology because it was the first widely used electrical device which could amplify; a small electrical signal applied to the grid could control a larger current flowing from the filament to plate. -
titanic
No one would have known the titanic sank if it werent for radio it save many lives -
Am Freq.
specializes in news and talk because of the frequency -
KDKA
licensed in Pittsburgh, Pennsylvania. Created by the Westinghouse Electric Corporation on November 2, 1920, it is the world's first commercial radio station, a distinction that has also been challenged by other stations, although it has claimed to be the "world's first commercially licensed radio station": WWJ in Detroit, Michigan (also a CBS Radio station), lists its "First Air Date" as August 20, 1920. KDKA is currently owned and operated by CBS Radio, with studios located at the combined CBS -
Personal radio stations
people would make their own radio sattions and everyone wanted to have one and it would cause some trouble -
FRC
unce charlie/personal radio became too popular and neeeded control and so the frc was created requiring a liscense to have a legal radio system you couldnt just have one in your basement -
FAMOUS SHOWS
Shows would be on radio very popular like superman and gunsmoke,the shadow,dick tracey -
Tv and the demise of radio
radio was looking down tv had come out and people became unintrested in radio advertisers went to tv instead od radio -
Golden era
GOlden era of radios during great depression most people had a radio people where hurting for moneyyyyyy$$$$$$$$$$$$$
radio provided people with relief and helped them feel away from the world -
radio and music
Radio makes a HUGE comeback with music and is saved it is the begining of odern radio -
RAdio NEw
NEw radios chalenge the old radio with fm and am frequiencies now days ther are satilite radio
