Sunday, 11 September 2016

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Saturday, 10 September 2016

How does satellite TV work?
Ans.
Satellite just acts like a huge virtual transmitting tower which can have large coverage area that is not possible by the terrestrial towers to cover. The TV signals are transmitted from an earth station to the satellite which then retransmits it back to earth. Depending upon how high in the space (orbital height) the satellite is, it can see large portion of the earth and can send the TV signals. Any user in that coverage are can receive the TV signal. The satellites used for TV broadcast are normally placed in the geostationary orbit at an altitude of 35, 768 km from the earth. From this altitude a satellite can see 42% of the earth surface. Sufficient power needs to be transmitted from satellite to ensure that the receiver gets enough signal power when it reaches earth after traveling that distance. The modulation format for satellite TV is different from that used in terrestrial TV transmission to efficiently use the power. Satellite TV employs QPSK modulation, most suitable for digital TV transmission.
Satellite TV offers many solutions to broadcast and cable TV problems. Learn what makes satellite TV different and how satellite TV works.Satellite TV works by broadcasting video and audio signals from geostationary satellites to satellite dishes on the Earth's surface. These geostationary satellites orbit the earth in a region of space known as the Clarke Belt, which is approximately 22,300 miles above the equator.
As we all know that satellites are positioned one-tenth of the way to the moon (about 36,000 km).Satellite television technology uses man-made or artificial satellites to send favourite serial to your television set. Satellites can be used to recoil television pictures, calls and internet information from one part of Earth to another at the speed of light.
FOR TO UNDERSTAND VISIT
https://www.bing.com/videos/search?q=how+does+satellite+tv+work%3f+youtube&view=detail&mid=E86878F4A16213C631FCE86878F4A16213C631FC&FORM=VIRE