<br><br><div><span class="gmail_quote">On 4/3/06, <b class="gmail_sendername">Craig Partin</b> <<a href="mailto:cpartin@gmail.com">cpartin@gmail.com</a>> wrote:</span><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
> > >>>>This is the first time I have been stumped in over two years of<br>> > >>>>mythtv<br>> > >>>>use. I got my HD-3000 working just fine tuning QAM stations over<br>
> > >>>>cable in myth. The system works flawlessly and reliably except that<br>> > >>>>QAM recordings get trashed when anything else is happening on the<br>> > >>>>system. It records beautifully when nothing else is happening. This
<br>> > >>>>happens on all channels, HD and SD. I can playback 1080i content<br>> > >>>>with<br>> > >>>>XVMC just fine, even with bob.<br>> > ><br>> > >
<br>> > > Sounds like interference getting into the HD-3000 from the video card.<br>> > > Try moving them farther apart, electrically shielding the card(s), and<br>> > > make sure if you have a jumper cable between the sound card and the HD-3000
<br>> > > that it is either removed or has RFI protection (a couple of turns through<br>> > > a torroidal core at each end).<br>> > ><br>> > > Good Luck.<br>> > This was going to be my response too.
<br>> > Since it is video related it has to be something the video card does,<br>> > either as an interference transmission or on the bus. Since it seems to<br>> > be size related I would not think it would be the bus. It is related to
<br>> > the 'active' area of the screen.<br>> ><br>> > You might, just to see if that is what is going on, try putting<br>> > something between the 2 cards to shield them from each other. A piece of
<br>> > aluminum plate, wrapped in cling wrap to avoid shorting things, would<br>> > do. Or for that matter a piece of alum foil between 2 sheets of paper.<br>> > Just remember to ground one corner of the shield to the case.
<br>> ><br>> > Geoff<br>><br>><br>> My mobo has a communications PCI slot, and I put the HD-3000 there.<br>> It also has spread spectrum controls to reduce RFI. I have switched<br>> slots and and toggled the RFI settings and noticed no change.
<br>><br>> I haven't done the exact test with the video card and signal strength<br>> but I cannot watch live TV or azap tune and watch in mplayer without<br>> corruption.<br>><br><br>Watching Live tv from the HD-3000 and with mythcommflag running in the
<br>background gives an iowait of ~2.0%. Nothing else in top looks bad<br>nor out of the ordinary. I don't think this is bus traffic problems.<br> I'll break out the tinfoil this weekend and if shielding the card<br>doesn't work maybe I can make a nice hat.
<br></blockquote></div><br><br>I would first make sure there is no IRQ conflict, say between HD-3000 and the sound card. I used to have similar problems. After I change the PCI slots around the problem is gone. I honestly don't think RF interference is a big issue here.
<br><br>DS<br>