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Ken Layton

what caused this interference

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Get yourself a ground loop amplifier (humbug)

it looks to me to be a ground imbalance. Basicly there is a voltage diference from where the camera is to where the dvr or monitor is. It could also be that your video cables are running alongside mains cables. stick a multi meter on the cable and see what voltage you get point to point (you should have around 1v)

hope this helps

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