[mythtv-users] HD-PVR horizontal bands

[Christopher Meredith]

On Wed, Nov 17, 2010 at 3:31 PM, Brian Wood <beww at beww.org> wrote:

> On Wednesday, November 17, 2010 02:08:31 pm Christopher Meredith wrote:
>
> > > Yeah, you can get magnetic ferrules for the cables, but if your
> > > hdpvr came with the same cables mine did (the 5 wire joined
> > > cable), it is very high quality (at least mine is)...
> >
> > Yeah, that's the one I'm using. I wonder what the problem is, then...
>
> The problem is not cable quality, it's most likely common mode AC hum.
>
> Try re-orienting your cabling, especially if you are crossing AC power
> wiring.
>
> Make sure all of your gear is connected to the same AC power outlet (as
> much as possible).
>
> Make sure all your gear is grounded or, conversely, don't use grounds
> except for the protective grounds in the power wiring.
>
> A fairly good explanation of ground loops is here:
>
> http://en.wikipedia.org/wiki/Ground_loop_(electricity)<http://en.wikipedia.org/wiki/Ground_loop_%28electricity%29>
>
>
In my case, the HD-PVR sits directly beside the STB and the component cable
goes directly from one to the other. The excess is coiled and bound with a
twist tie. Everything is plugged into a single power strip which is plugged
into a single outlet. Come to think of it, I actually have a second power
strip plugged into the first (I know, I know).

I do have the monitor output from the HD-PVR connected directly to the TV. I
can't imagine how that could be causing it but I'll mention it anyway.
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