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Telecommunication

""Telecom-icon.svg

"Telecommunications refers to wave-based communication technology through media such as air, cables etc. Telecommunication is the "transmission of "information over significant distances to communicate. In earlier times, telecommunications involved the use of visual signals, such as "beacons, "smoke signals, "semaphore telegraphs, "signal flags, and optical "heliographs, or audio messages via coded drumbeats, lung-blown horns, or sent by loud whistles, for example. In the modern age of electricity and electronics, telecommunications now also includes the use of electrical devices such as "telegraphs, telephones, and "teleprinters, the use of radio and "microwave communications, as well as "fiber optics and their associated electronics, plus the use of "orbiting satellites and the Internet.

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""Hammer Ace SATCOM Antenna.jpg

An "antenna or aerial is an arrangement of aerial "electrical conductors designed to "transmit or "receive "radio waves which is a class of "electromagnetic waves. In other words, antennas basically convert radio frequency electrical currents into electromagnetic waves and vice versa. Antennas are used in systems such as "radio and "television broadcasting, point-to-point radio communication, "radar, and "space exploration. Antennas usually work in air or outer space, but can also be operated under water or even through soil and rock at certain frequencies for short distances.

Physically, an antenna is an arrangement of "conductors that generate a radiating "electromagnetic field in response to an applied alternating voltage and the associated alternating "electric current, or can be placed in an electromagnetic field so that the field will "induce an alternating current in the antenna and a voltage between its terminals. Some antenna devices (parabola, horn antenna) just adapt the free space to another type of antenna.

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""Samsung Galaxy Note
Credit: "Pangkakit

Smartphones (or smart phones) are "mobile phones with an advanced "mobile operating system.

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In the news

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Telecommunications News from Wikinews


March 3, 2011: Telecom Commission of Solomon Islands issues phone company US$1M fine
February 22, 2011: Libya blocks access to Internet
September 1, 2010: Telstra becomes the first in the world to switch to HSPA+ wireless Internet technology

Selected biography

""Alexander Graham Bell.jpg

"Alexander Graham Bell ( March 3,1847 – August 2, 1922 ) was an outstanding "scientist, "inventor, and innovator. Born and brought up in "Scotland, he emigrated to "Canada, and later, the "United States. Over the years, his work and efforts were expressed between both countries. Bell is widely acclaimed as the prime developer of the "telephone, with considerable honourable mention to "Antonio Meucci and "Philipp Reis. In addition to Bell's work in "telecommunications, he was responsible for important advances in "aviation and "hydrofoil technology.

Did you know?

...that "Intelsat 1, known as Early Bird, launched in 1965, provided either 240 voice circuits or one two-way television channel between the United States and Europe.

...that the first telephone message was transmitted in 1876 from one room in "Alexander Graham Bell’s house to another.

...that in 1880 France rewarded Bell the "Volta Prize, worth 50,000 francs, for his invention.

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