Page 19 - Electronic Media

Electronic Media 19

$ 1896- Marconi demonstrates his apparatus to the British
authorities by transmitting signals for more than 1 mile.

$ 1898- ‘Wireless telegraphy’ is used for the first time in naval
maneuvers - a range of 60 miles.

$ 1899- Communication between England and France.
$ 1901- Communication across the Atlantic.

$ 1906- American inventor de Forest adds a third electrode to the
diode and produces a sensitive receiver and amplifier.

$ 1914- The thermionic valve is used as a radio generator which
produces a carrier wave capable of being modulated by speech.
Marconi transmits speech over 50 miles.

$ 1915- A radio station in Arlington, USA, communicates with
both Paris and Honolulu.

$ 1920- The rectifying properties of crystals, which means they
could be used as radio detectors, gives rise to the popularity of
the crystal-set.

Today! Immense developments in radio communication technology
after World War II helped make possible space exploration, most
dramatically in the Apollo moon-landing missions
(1969-72) and communications satellites.

Personalities related to radio

Samuel Morse. (1791 - 1872)- Developed
apparatus for an electromagnetic telegraph in 1836.
He also invented a code, now known as the Morse
code, for use with his telegraph instrument. Samuel Morse