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Invention of Radio
James Clerk Maxwell showed in theoretical and mathematical form in 1864 that electromagnetic waves could propagate free space -
First Fully Complete Radio
Italian inventor Guglielmo Marconi built the first complete, successful wireless telegraphy system based on airborne Hertzian waves. -
Amplitude-Modulated Radio
The invention of amplitude-modulated radio is so that more than one station can send signals and have multiple stations and is creators go to Reginald Fessenden and Lee de Forest. -
Vacuum Tubes
the mid 1920's amplifying vacuum tubes revolutionized radio receivers and transmitters John Ambrosia Fleming developed a vacuum tube. -
Longer Transmission of Radio
Marconi raised the height of the antenna and hit the idea of grounding his transmitter and receiver and with these improvements the radio signalm was capable of transmitting signals up to 2 miles -
Weak Transmission of Voice Over Airwaves.
In 1900 Reginald Fessenden made a weak transmission of voice over the airwaves. -
voice on radio and later music
Charles Herrold, an electronics instructor in San Jose, California constructed a broadcasting station and used a spark gap technology and produced voice and later music on the station -
Pocket Radio
the Regency company introduced a pocket transistor radio,or known as the TR-1, powered by a standard 22.5 Volt battery . -
Phone Service
in 1947, at&t commercialized mobile cellphone service, and it started in st.Lewis. Then at&t commercialized mobile telephone service, and advertised to one hundred towns and highway corridors. -
Internet Radio
Internet Radio was made by Carl Malamud In 1993 he launched Internet Talk Radio and which was the first computer radio talk show and interviewing a computer expert once a week.
