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History of Satellite TV
- Satellite Dish TV television is television delivered
by way of orbiting communications satellites located 37,000 km (22,300 miles) above the earth's surface. The first
satellite television 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 Dish TV television, like other communications
relayed by satellite, starts with a transmitting 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 increased diameter results in more accurate positioning and improved
signal reception at the satellite. The signal 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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The satellite signal, quite weak after travelling 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 downconverter, or LNB (Direct broadcast satellite dishes use an
LNBF, which integrates the feedhorn with the LNB).
The signal, now amplified, travels to a satellite Dish 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.
There are two primary types of satellite television distribution: direct broadcast satellite (DBS) and television
receive-only (TVRO). An example of the most popular is Dish Network available from Satellite TV.
Direct broadcast satellite, or DBS, is a relatively recent development in the world of television distribution.
"Direct broadcast satellite" can either refer to the communications satellites themselves that deliver
DBS service or the actual television service. DBS systems are commonly referred to as "minidish" systems.
DBS uses the upper portion of Ku-Band.
The first commercial DBS service, Sky Television, was launched in 1989 and served customers in the United Kingdom.
Hughes's DirecTV, the first high-powered DBS system, went online in 1994 and was the first North American DBS service.
In 1996, Echostar's DISH Network went online in the United States and has gone on to similar success as DirecTV's
primary competitor. Commercial DBS services are the primary competition to cable television service. An example
of the most popular is Dish Network available from Satellite TV or Dish TV.
In Canada, the two DBS services available are Bell Canada's ExpressVu and StarChoice.
Television receive-only, or TVRO, refers to satellite television reception equipment that is based primarily on
open standards equipment. This contrasts sharply with direct broadcast satellite, which is a completely closed
system that uses proprietary reception equipment. TVRO is often referred to as "big dish" satellite television.
TVRO systems are designed to receive analog satellite signals from both C-Band and Ku-Band satellite television
or audio signals. TVRO systems tend to use larger rather than smaller satellite dish antennas, since it is more
likely that the owner of a TVRO system would have a C-Band only setup rather than a Ku-Band only setup. Additional
receiver boxes allow for different types of digital satellite signal reception, such as DVB/MPEG-2 and 4DTV.
Direct broadcasting satellites which can be received by what are known in Chinese as little ears have had a major
role in breaking the government monopoly of information on Mainland China. Although met with frequent and generally
unsuccessful efforts to regulate them, satellite dishes are fairly common in urban Chinese cities. Satellite television
and Dish TV has also played an important role in broadcasting to expatriate communities such as Arabs, and overseas
Chinese.
Note - This page based on content from Wikipdeia.
You can find the original at:
http://en.wikipedia.org/wiki/Satellite_television
This page is also available for use by others as part of the GNU Documentation License at: LICENSE
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There are two primary types of satellite television distribution: direct broadcast satellite (DBS) and television receive-only (TVRO). An
example of the most popular is Dish Network available from Satellite TV.
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