[mythtv-users] HD-PVR horizontal bands

[john blue]

On Thu, 18 Nov 2010 08:53:42 am Christopher Meredith wrote:
> 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.wikipedi
> > a.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).

Christopher, this may be a useless idea , but is relatively cheap to try.  Could I suggest you make your cable 'untidy' 
and try just uncoiling the excess, to see if that helps the problem. I have had problems with some cables that were a 
bit long and were coiled. Using a shorter cable of straightening up the cable usually sovled any issue. However, I have 
not had a similar issue to yours.

> 
> 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.

-- 
__
John

-- 

John Blue
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