Ben Bucksch wrote: > Luc Brosens schrieb: >> why does inserting and accessing a CAM reduce the signal and SNR levels ? >> (even if no descrambling is needed, as for BBC World) >> > > My *guess*: > I guess it's due to power - the cards need a lot of power to go over the > wire to the dish. The CAM may push it over the limit. The fact that you > have 2 PCI cards probably doesn't help. > >>> >>> so I removed the second card, and I'm relieved that this didn't solve the >>> problem >>> I have succeeded to descramble several of the other channels, but only >>> rarely succeed at it : mostly tuning just fails >>> most successes seem to occur after a (cold) boot ? >>> it seems that gnutv either gets a lock immediately (before the CAM >>> messages) or not at all >>> could it be that tuning and CAM access are interfering ? >>> is there a way to skip the tuning part of gnutv ? (I could tune with szap >>> -x, take over descrambling with gnutv) >>> >>> as for power consumption : neither of the cards are warm, not even slightly >>> my other mythtv-box contains a Hauppauge MCE500 and a PVR350 : these cards >>> run really hot, surely these KNC1s should be OK ? >>> the total power consumption of my box (1GB RAM, 300GB SATA HD, AMD 64X2 >>> 3600+) is only 61W, including the two KNC1 cards and CI slot >>> >> how can this be solved ? >> > > - Ensure more power on PCI bus > - shorter cable to dish > - different mainboard / cards > - less cards > - USB DVB adapters, on powered USB switch > etc. > >>> >>> removing the second card didn't help >>> there are only 2 PCI slots, the other one contained the other KNC1 >>> both PCIe slots (16x and 1x) are empty >>> don't see how I could get more power to the PCI bus ... >>> >>> I admit that my cables are long, but my settop box is happy : >>> signal strength 70% and up, SNR 90% and up >>> >> anyone out there having the same problems ? >> > > hm, I hope I don't. I just added the second card and seeing strange > problems. > >>> >>> hope you get the second card working OK ! >>> remember to check the PCI slots : my first motherboard had a defective slot >>>
> Ben > _______________________________________________ linux-dvb mailing list linux-dvb@linuxtv.org http://www.linuxtv.org/cgi-bin/mailman/listinfo/linux-dvb
