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Nothing would happen.

It is not a pass-through, like the D* SD IRDs.

The AM21 will only tune over-the-air digital (ATSC) signals.

The cable has analog (NTSC) or digital (QAM) signals.

Hook the cable directly to the HDTV. Then you can switch between the D* box input (HDMI or Component) and the TV's tuner.
 
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