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I have had issues similar to this with the ATSC tuners(not the coupon eligable converters) that I obtained from Newegg.com. When this occurs, I can either turn the ATSC tuner off and back on again or the TV on and back on again, then the interference is gone. I suspect that some sort of resonance is setting up.
I also have ATSC tuners from a now defunct CATV company. These have never had the issue. (Overall, it is my opionion that the CATV tuner build quality is better than the Newegg tuners).
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