[mythtv-users] HD-3000 recording corruption

[Craig Partin]

On 3/30/06, R. G. Newbury <newbury at mandamus.org> wrote:
> Patrick Ouellette wrote:
> > On Thu, Mar 30, 2006 at 02:50:06PM -0700, Brian Wood wrote:
> >
> >>On Mar 30, 2006, at 2:41 PM, Steven Ihde wrote:
> >>
> >>>On Wednesday 29 March 2006 07:22, Craig Partin wrote:
> >>>
> >>>>This is the first time I have been stumped in over two years of
> >>>>mythtv
> >>>>use.  I got my HD-3000 working just fine tuning QAM stations over
> >>>>cable in myth.  The system works flawlessly and reliably except that
> >>>>QAM recordings get trashed when anything else is happening on the
> >>>>system.  It records beautifully when nothing else is happening.  This
> >>>>happens on all channels, HD and SD.  I can playback 1080i content
> >>>>with
> >>>>XVMC just fine, even with bob.
> >
> >
> > Sounds like interference getting into the HD-3000 from the video card.
> > Try moving them farther apart, electrically shielding the card(s), and
> > make sure if you have a jumper cable between the sound card and the HD-3000
> > that it is either removed or has RFI protection (a couple of turns through
> > a torroidal core at each end).
> >
> > Good Luck.
> This was going to be my response too.
> Since it is video related it has to be something the video card does,
> either as an interference transmission or on the bus. Since it seems to
> be size related I would not think it would be the bus. It is related to
> the 'active' area of the screen.
>
> You might, just to see if that is what is going on, try putting
> something between the 2 cards to shield them from each other. A piece of
> aluminum plate, wrapped in cling wrap to avoid shorting things, would
> do. Or for that matter a piece of alum foil between 2 sheets of paper.
> Just remember to ground one corner of the shield to the case.
>
> Geoff


My mobo has a communications PCI slot, and I put the HD-3000 there. 
It also has spread spectrum controls to reduce RFI.  I have switched
slots and and toggled the RFI settings and noticed no change.

I haven't done the exact test with the video card and signal strength
but I cannot watch live TV or azap tune and watch in mplayer without
corruption.