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Electromagnetic waves
Clerk Maxwell formulates the theory of electromagnetic waves, the basis of radio.
So nobody believed Maxwell's theory until a German physicist R. Heinrich Hertz (1857-1894) discovered radio waves through a series of experiments confirming Maxwell's theory of electromagnetic radiation. -
When they invented
Guillermo Marconi and Reginald Fessenden invented in the 1890s.
Guillermo Marconi invents radio, connecting for the first time Europe and America through a radiotelegraph signal, a historical date for the development of modern communications. -
Public transmission
The scienttific Nikola Tesla did the first public demonstration of a radio transmission.
Nikola Tesla demonstrated for the first time the possibility of transmitting electrical energy without cables, and therefore, the possibility of wireless communication. Tesla presented a circuit consisting of a battery of Leyden vibrating capacitors and a coil. This device made up its "transmitter". -
Human Voice
Julio Cervera was the first to transmit human voice between Alicante and Ibiza. -
Radio de Galena
A galena radio is an AM radio receiver that used a semiconductor lead-sulfide crystal to "detect" radio signals in modulated amplitude in the medium wave or shortwave band. -
Transmission
First transmissions for regular entertainment in the US and Argentina -
Evolution
The 27 of August of 1920 the installation of antenas was made. -
BBC
The bbc is founded -
The boom
The radio at 1945 have a boom,because have a modulate frequency. (FM) -
Popularize
The radio don´t was popularize until 1980,nowadays we know it like that.
