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  #16  
Old 07-25-2016, 07:07 AM
kf4rca kf4rca is offline
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Join Date: Feb 2015
Location: Atlanta
Posts: 737
This is what I think. You've got poor decoupling between your sweep supply busses and your video. Add some capacitors to the supply rails and see if it doesn't go away.
A similar condition also occurs in monitors.
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