Trent Piepho wrote: > On Wed, 2 May 2007, Robert wrote: >> I managed to track this down to two things. >> >> Firstly if I used the NVIDIA binary drivers, I had this problem, but if >> I used the "nv" driver I didn't. For me using the nv driver wasn't >> really an option (MythTV menus were horribly slow) > > I had this same problem (and so did others) with a pcHDTV HD-3000 ATSC card > receiving QAM-256. With the nvidia binary driver, graphics activity would > kill reception, while the nv driver didn't have this problem. 8-VSB > reception, which doesn't need as high a SNR, is ok with the nvidia driver. > > I could run azap and watch the lock and SNR readings. If nothing was > happening, they would be ok. But as soon as I moved a window around > or started mplayer or scrolled an xterm, the SNR would drop and lock > would be lost. > Normally the graphics cards do create a lot of noise in the RF spectrum. If the RF input stages are unshielded (in many cases) the noise from the VGA cards do get picked up by a nearby DVB card. the noise would depend on what the Graphics card is doing. You can even make a modulator out of it. We do even have a case where we can use an nVidia card as a DVB transmitter It could be noise, It could be a signal from an adjacent DVB card too. _______________________________________________ linux-dvb mailing list linux-dvb@xxxxxxxxxxx http://www.linuxtv.org/cgi-bin/mailman/listinfo/linux-dvb
