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James Clerk Maxwell
Showed mathematically that electromagnetic waves could travel through air -
Heinrich Hertz
Prooved Maxwells theory, showing that someone could produce and detect electromagnetic radiation. -
Nikola Tesla
Used Maxwells mathematic findings to demonstrate the sending and receiving a radio frequency energy, proposed that this could be used for sending and receiving information -
Guglielmo Marconi
Built the first wireless transmiter, it was capable of sending signals up to one and a half miles -
Spark-gap transmitter
Allowed the production of the first commercially available radio sets, but this where plagued with problems such as electrical interference -
Guglielmo Marconi
Developed the Worlds first transatlantic radio communication service between Clifton, Ireland and Newfoundland -
Crystal Sets
Were used mostly in American homes, this is the evolution of spark gap radios which had some problems. This were the first widely produced and used radio sets in America. This was a connection of Americans to the rest of the country -
Edwin H. Armstrong
Inveted FM radio (Frequency Modulation), this uses a wavelength less static than AM (Amplitude Modulation) -
Transistor Radio
Advantage, "last evolution", were much cheaper, uses less power, smaller size and very long lifespan
