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QAM is a cable-TV standard; DirecTV and other satellite services use other signal types (DVB-S is one of them). That Samsung tuner was made to allow DirecTV customers to watch HD satellite channels as well as HD over-the-air signals with an antenna. That was a common combination before the satellite companies started having HD broadcast network signals available on the satellites themselves, in the earlier days of HDTV.
Remember, ATSC is NOT QAM, and QAM is NOT satellite (DVB-S, etc.)... Each is a different method of modulating and demodulating digital-TV signals. In the ham radio world, think of AM versus FM versus SSB. All are used for voice, but each has different advantages and disadvantages depending on where the signals are going to be transmitted and received.
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Chris
Quote from another forum: "(Antique TV collecting) always seemed to me to be a fringe hobby that only weirdos did."
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