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Satellite TV
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Here is some information about satellite TV.
Satellite television or satellite TV is television delivered by way of orbiting communications satellites located 37,000 km above the earth's surface.
The first satellite TV signal was relayed from Europe to the Telstar satellite over North America in 1962. The first domestic North American satellite to carry television was Canada's Anik 1, which was launched in 1973.
Satellite TV, like other communications relayed by satellite, starts with a transmitting satellite antenna located at an uplink facility. Uplink satellite dishes are directed toward the satellite that its signals will be transmitted to, and are very large, as much as 9 to 12 meters (30 to 40 feet) in diameter. The larger the satellite dish, the more accurate positioning and improved signal reception at the satellite. The satellite TV signals is transmitted to devices located on-board the satellite called transponders, which retransmit the satellite signal back towards the Earth at a different frequency. |
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DISH Network Free satellite TV equipment offer available anywhere in the continental USA and Hawaii
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The satellite signal, quite weak after traveling through space, is collected by a parabolic receiving dish, which reflects the weak signal to the dish's focal point and is received, down-converted to a lower frequency band and amplified by a device called a low-noise block down converter, or LNB.
A new form of satellite antenna, which does not use a directed parabolic dish and can be used on a mobile platform such as a vehicle, was recently announced by the University of Waterloo. On commonly known as car satellite system.
The satellite 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 is converted by a local oscillator to the L-band range of frequencies (approximately). Special on-board electronics in the receiver box help tune the signal and then convert it to a frequency that a standard television can use. |
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Washington—Dish Network, the satellite TV provider, is telling the Federal Communications Commission that large cash demands by TV stations could lead to carriage disputes early next year on the eve of the transition to all-digital broadcasting.
Demand for digital TV conversion boxes and coupons for them are greater than anticipated. Problems with getting coupons from the government as well as a shortage of TV converter boxes means those with older TV sets need to take some action sooner rather than later if they want to keep getting television broadcasts without having to subscribe to cable or a satellite dish service.
DUBLIN, Ireland, BUSINESS WIRE -- Research and Markets (http://www.researchandmarkets.com/research/afd402/2008_digital_media) has announced the addition of the "2008 Digital Media Technologies - Digital TV, Mobile TV, IPTV, MPEG " report to their offering.
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