Re: [linux-dvb] Hauppauge PVR-150 Vertical sync issue?

On Mon, 2009-12-21 at 15:09 -0500, Robert Longfield wrote:
> Well it gets even better.
> So on the weekend I was able to steal a few minutes to properly
> trouble shoot the issue now that I know it was in the mythbuntu box.
> As a long shot I pulled out the Promise Tech Ultra133 TX2 / ATA card I
> am using for the backup drive. With this card removed the sync issue
> went away, when I put the card back in the issue returned. Now this
> card was in the slot right next to the PVR-150 card. I moved the
> controller card as far away as I could get from the PVR-150 and the
> sync issue was gone.
> 
> So it would appear that the Promise Tech card was causing some EM
> interference with the PVR-150 card. I will keep an eye on this to make
> sure that this was indeed the issue.
> 
> Does it seem reasonable that this card would kick out interference like this?

Yes, it is plausible.

Perhaps you may also wish to consider an external (USB connected)
capture device.  A PC can internally have many sources of square waves
that have either fundamental or harmonic frequencies in UHF.  The metal
case of a PC can greatly reduce the EMI on outside of the case.

Regards,
Andy

> -Rob
> 
> On Fri, Dec 18, 2009 at 3:13 PM, Steven Toth <[email protected]> wrote:
> >> So it looks like the problem is restricted to my mythbuntu box.
> >
> > Congrats, that's better news.
> >
> > --
> > Steven Toth - Kernel Labs
> > http://www.kernellabs.com