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Lack of DC restoration certainly contributes to the problem. Reducing the video modulation level will reduce the problem.
Bottom line is that you need to look to see if you are overmodulating.
Poor low frequency video response also contributes. Check the coupling capacitors after the video detector and ensure they are at least 0.1 ufd.
Last edited by Penthode; 08-22-2019 at 09:22 PM.
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