Triple LNB but only one cable - DirecTV DVR

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For Triple LNB but only one cable, relating to DirecTV DVRs and receivers. I just bought an HD DVR from Direct TV. Even though I have 4 cables coming out of my dish, I only have one cable coming out of the wall so i think my installers may have put a Multiswitch on the unit already. What would I need to set up the dual tuner option on the DVR?

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