Do any of the cable providers carry broadcasters' ATSC signal on their cable or are they always contained by QAM? I'm specifically interested in Comcast contained by the San Francisco area.

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Answers: 

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Cable uses the QAM tuning system, ATSC is an over-the-air tuner....

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cable is always qam The ATSC standard is just for broadcast (over the airwaves via antenna) TV. Digital cable standard is QAM

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