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

[Lan Barnes]

On Thu, September 6, 2007 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.
>
> I don't have a STB, but Time Warner did install a powered amplifier before
> I set up the PVR.  The outlets in use are properly wired (polarity and
> ground).
>
>

I'm late to the thread. Forgive me if this is (a) already said (b) bloody
obvious.

Distortions and hum can be caused by tiny differences in voltage between
appliances. Tying everything to a common ground (TV. computer case, coax
splitteres, etc) can fix this. I have a long piece of cheap bailing wire
going from ground screw to ground screw behind my TV cabinet.

-- 
Lan Barnes

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