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I've been getting intermittent interference on cable TV that causes HD channels to garble or drop out, and analog channels get horizontal streaking. It's not a general "snow" effect, it's more like bursts of horizontal streaks in the picture. The horizontal lines do not scroll up or down, they just sort of flash on/off. It has a sharper, more "local" look to it than a typical noisy weak signal would have.


I had a service visit and the cable company has my gotten my signal very clear...95% of the time. The other 5% of the time it's this streaky mess. It seems to come on after the sun goes down as if a component is flaky when it cools down. (It's quite hot here...Austin Texas). It happens on both my TVs which are on independent cable runs.


I've basically eliminated every local source of interference except for general power supply issues, which I have no way to measure or control. So I'm wondering if dirty power could be generating this interference.
 
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