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Satellite television or satellite television is television delivered through orbiting communications satellites located 37,000 km above the earth's surface.
cardsharing - The initial satellite tv signal was relayed from Europe for that Telstar satellite over North America in 1962. The first domestic United states satellite to hold television was Canada's Anik 1, that's been launched in 1973.
Satellite TV, like other communications relayed by satellite, begins with a transmitting satellite antenna at an uplink facility. Uplink satellite dishes are targeted at the satellite what has signals will be transmitted to, and so are very large, up to 9 to 12 meters (40-45 feet) across. The better the dish, the more often accurate positioning and improved signal reception on the satellite. It signals is transmitted to devices located on-board the satellite called transponders, which retransmit the satellite signal back on the Earth using a different frequency.
The satellite signal, quite weak after traveling through space, is collected using a parabolic receiving dish, which reflects the weak signal for your dish's center point and is also received, down-converted for some lower frequency band and amplified by way of a device called a low-noise block down converter, or LNB.
A brand new sort of satellite antenna, which does not use a directed parabolic dish and is utilized on a mobile platform for instance a vehicle, was recently announced by the University of Waterloo. On typically referred to as car satellite system.
The tv signal, now amplified, travels to a satellite tv receiver box through coaxial cable (RG-6 or RG-10; cannot be standard RG-59) and it is converted using a local oscillator for the L-band selection of frequencies (approximately). Special on-board electronics in the receiver box help tune the signal then convert it using a frequency that a standard television could use.
While you known, tv business in United states are mainly covered with two companies, Dish Network and DirecTV. In order to get a satellite television in your house, the options mostly are restricted to the disposable tv packages that proposed by every one Dish Network or DirecTV.
This is a quick take on Usa tv industry: Hughes's DirecTV, the original high-powered DBS system, went online in 1994 known as the first Us DBS service. In 1996, Echostar's Dish Network went online in the united states and possesses gone onto similar success.
Source: http://www.proman-help.isys-informatik.ch/index.php/Benutzer%3ARollerGale548
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