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Old 09-17-2017, 08:06 PM
Electronic M's Avatar
Electronic M Electronic M is offline
M is for Memory
 
Join Date: Jan 2011
Location: Pewaukee/Delafield Wi
Posts: 14,820
If your using a cheap consumer grade modulator it can be the modulators fault. Some units use a single carrier osc. that gets AM and FM modulated...If the AM video modulation exceeds %100 it will also affect the FM sound...As noise that repeats at 60Hz and varies with video content.
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