Wednesday, March 11, 2009

Tuesday, March 10, 2009


The pre-history and early history of radio is the history of technology that produced radio instruments that use radio waves. Within the timeline of radio, many people contributed theory and inventions in what became radio.Radio development began as "wireless telegraphy".Later radio history increasingly involves matters of programming and content.

Who invented the radio?
In the history of radio and development of "
wireless telegraphy", several people are claimed to have "invented the radio" leading to a great radio controversy. The most commonly accepted claims are:
Jagadish Chandra Bose
Guglielmo Marconi, who equipped ships with life-saving wireless communications, conducted a reported transatlantic radio communications experiments in 1901 and established the first commercial transatlantic radio service in 1907.
Alexander Stepanovich Popov
Nikola Tesla, who developed means to reliably produce radio frequency currents, publicly demonstrated the principles of radio, and transmitted long distance signals. In 1943 the US Supreme Court upheld Tesla's patent number U.S. Patent 645,576.
The reason it is not obvious who invented radio is that the technology is a product of many different discoveries and developments.
Various scientists proposed that
electricity and magnetism, both capable of causing attraction and repulsion of objects, were linked. In 1802 Gian Domenico Romagnosi suggested the relationship between electric current and magnetism, but his reports went unnoticed. In 1820 Hans Christian Ørsted performed a widely known experiment on man-made electric current and magnetism. He demonstrated that a wire carrying a current could deflect a magnetized compass needle. Ørsted's experiments discovered the relationship between electricity and magnetism in a very simple experiment. Ørsted's work influenced André-Marie Ampère to produce a theory of electromagnetism. During its early development and long after wide use of the technology, disputes persisted as to who could claim sole credit for this obvious boon to mankind. Closely related, radio was developed along with two other key inventions, the telegraph and the telephone.

Wednesday, March 4, 2009

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