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"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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""A diagram of radio waves and radio transmission
Credit: "LadyofHats

This "diagram shows both the position of "radio waves in the "electromagnetic spectrum ("logarithmic scale) as well as how radio waves are used for communication.

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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

"Nikola Tesla ("Serbian Cyrillic: Никола Тесла) (10 July 1856 – 7 January 1943[1]) was an "inventor, "physicist, "mechanical engineer and "electrical engineer. Born in "Smiljan, "Military Frontier, "Austria-Hungary, he was an ethnic "Serb subject of the "Austrian Empire and later became an "American citizen. Tesla is best known for his many revolutionary contributions to the discipline of "electricity and magnetism in the late 19th and early 20th century. "Tesla's patents and theoretical work formed the basis of modern "alternating current "electric power (AC) systems, including the "polyphase "power distribution systems and the "AC motor, with which he helped usher in the "Second Industrial Revolution.


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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