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Thursday, November 4, 2010

DTH (Direct to Home Service) My presentation


How does DTH work?




In simple terms the service provider broadcasts the signal that is sent to the satellite that then transmits the signal back to earth which is picked up by your dish antenna and fed to your television set.


A DTH service provider has to lease Ku-band transponders from the satellite. The encoder converts the audio, video and data signals into the digital format and the multiplexer mixes these signals. At the user end, there will be a small dish antenna and set-top boxes to decode and view numerous channels On the user's end, receiving dishes can be as small as 45 cm in diametre.
DTH is an encrypted transmission that travels to the consumer directly through a satellite. DTH transmission is received directly by the consumer at his end through the small dish antenna. A set-top box, unlike the regular cable connection decodes the encrypted transmission.  


Following figure shows the typical view of Antenna, STB and Transmission of signal.