[mythtv-users] Electrical power in my cable line? Is that bad?

David Brodbeck gull at gull.us
Fri Sep 7 16:30:18 UTC 2007

On Sep 6, 2007, at 8:15 PM, Keith Pyle wrote:

> Brian Wood wrote:
>> Such problems can show up as AC hum in the video, usually as a double
>> bar slowly rising through the picture (assuming NTSC).
> I see a horizontal distortion on many recordings (see attachment,  
> just below the rating box).  Is this a manifestation of the AC hum  
> Brian mentioned?  I only see this on recordings captured with my  
> PVR-500, not on televisions viewing the signal directly.

It certainly looks like a hum bar.

I have this problem with my system sometimes, but I only see it on  
*some* of the channels, which makes me suspect it's actually  
happening at the cable head-end.

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