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  #16  
Old 07-25-2016, 07:07 AM
kf4rca kf4rca is offline
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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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  #17  
Old 07-28-2016, 10:46 AM
Ralph S Ralph S is offline
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Adding capacitors didn't work. I am suspicious that there might be an error in return beam landing, but I can't find anything in the literature (including patents) which allude to this fault other than the work done on image isocons.
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