Invention of the radio

Development from a laboratory demonstration to commercial utility spanned several decades and required the efforts of many practitioners. The controversy over who invented the radio can be broken down as follows:

In 1887, David E.Hughes transmitted Morse code by radio at and below the super low frequency range.

In 1888, Heinrich Hertz produced and measured the ultra high frequency range.

In 1891, Nikola Tesla began wireless research. He developed means to reliably produce radio frequencies, publicly demonstrated the principles of radio, and transmitted long-distance signals.

Between 1893 and 1894, Roberto Landell de Moura, a Brazilian priest and scientist, conducted experiments. He did not publicise his achievement until 1900 but later obtained Brazilian patent.

In 1894, A.S.Popov built his first radio receiver, which contained a coherer but actually coherer was first demonstrated by J.C. Bose. Popov demonstrated the coherer, further refined as a lightning detector, to the Russian Physical and Chemical Society.

In 1894, Gugliemo Marconi read about Hertz's and Tesla's work on wireless telegraphy, and began his own experiments.

By 1897 Nikola Tesla had successfully conducted experiments, and obtained a U.S. patent for his invention of "wireless transmission of data" (i.e. radio) in 1897 and 1900.

In December of 1901 Gugliemo Marconi used J.C. Bose's inventions to receive the radio signal in his first transatlantic radio communication over a distance of 2000 miles. Marconi was celebrated worldwide for this achievement, but the fact that the radio patent was already registered by Tesla in 1900, as well as the fact the receiver was invented by Bose was not well known. Soon after, the patent is given to Marconi. He even received the Nobel Prize.

In early 1900s Reginald Fessenden and Lee de Forest invented amplitude-modulated (AM) radio allowing an audio signal to be sent over the air.

In 1935, Edwin H. Armstrong invented frequency-modulated (FV) radio, so that an audio signal can avoid "static," that is, interference from electrical equipment and atmospherics.

So, many people were involved in the invention of radio transmission of information as we know it today. Despite this, during its early development and long after wide acceptance, disputes persisted as to who could claim sole credit for this obvious boon to mankind.

Дата добавления: 2015-09-04