Added: 07/07/2005 |
Satellite TVThe first satellite television signal was relayed from Europe to the Telstar satellite over North America in 1962. The AT&T, NASA, and a number of other companies launched Telstar as a part of their multi-national agreement. The first domestic North American satellite to carry television was Canada's Anik 1, which was launched in 1973.
Satellite television systems are still not cheap, and that is why people who want to have access to the best world channels broadcasted via satellites, go to cable companies and pay them for this access. For the moment, this method of getting high quality information and entertainment programs on TV is better and cheaper.
The most famous satellite television companies in the world are Sky Television in the UK, Hughes's DirecTV and Echostar's DISH Network in the US, Bell Canada's ExpressVu and StarChoice in Canada, DirecTV in Latin America, Foxtel and Optus Television in Australia, Eutelsat and Astra in Europe, Sky perfect in Japan, Multichoice is the satellite for both South Africa and sub-Saharan Africa. Satellite television also plays an important role in broadcasting to expatriate communities such as Arabs, and overseas Chinese.
There are two primary types of satellite television distribution: direct broadcast satellite (DBS) and television receive-only (TVRO). Getting into a satellite dish, the signals of different frequencies from the space become rather weak. Inside the dish, the signal is down-converted to a lower frequency band and amplified by a device called a low-noise block downconverter.
The University of Waterloo has recently invented the new form of satellite antenna that does not use a directed parabolic dish and can be used on a mobile platform such as a vehicle. On-board electronics in the receiver box help tune the signal and then convert it to a frequency that a standard television can use. The sad sides of using the satellite are that during the storms, snow, or rain you can have problems watching the satellite channels. The quality of the transferred signal can be bad or all the channels may be lost at once, and that quality does not depend on whether you have your own satellite dish or use the signal provided by cable television. Signals can be better when you are using cable TV because respectable cable companies use satellite dishes of bigger diameter, usually between 30 and 40 feet. Bigger satellite dishes allow companies to have a more accurate positioning and improved a signal reception at the satellite.
TVRO (television receive-only) systems tend to use larger rather than smaller satellite dish antennas. Additional receiver boxes allow getting different types of digital satellite signal reception, such as DVB/MPEG-2 and 4DTV. If you are a very TV oriented person and always want to have access to accurate and veritable information, the combination of cable and satellite is the best choice for you. If you choose to use the services of the companies listed in this article, most likely, you will be content with their quality since these companies are world leaders, and they have greater audience and lower prices.
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