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Please Help Me

I got an question that is How a STB (Direct To Home) service box is tuned particular Tv channel when i pressed the channel number in Remote of the STB, How it is possible. because one frequecy in satellite is used for many Other services like Tv Broadcaster and DTH provides
Ex:- If we wish to play FM music in radio we should tune particular frequecy, Other radio broadcaster will not play at the same frequecy, but how satellite services use same frequecy for many service and how it is possible?????

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  1. Its done through multiplexing. In which we can mix so many signals together.

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