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HD evangelist
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rlj5242 said:
...What you are describing sounds like a ground loop...
It sounds nothing like what would be experienced from a ground loop. That would typically cause 60 Hz hum, or bars rolling slowly up the screen. Bars rolling sideways would have to be the product of interference at a much higher frequency than 60 Hz, and so would not manifest due to a ground loop.

What you are describing sounds more like inter-chassis interference, or adjacent-channel cross-modulation.
 
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