Sorry about the short replies, in a hurry... On Saturday 12 June 2004 00:30, Ragnar Sundblad wrote: > --On den 11 juni 2004 23:44 +0200 Kenneth Aafløy <[EMAIL PROTECTED]> wrote: > > The question if this is the case, which > > is pretty obvious to me is who is to blame? The card producer that makes > > a card that is borderline or the maker of the PSU which obviously has to > > be out of spec? > > "the PSU which obviously was out of spec"? > > I had to replace PSU too, and it absolutely wasn't out of spec. > It had a little low 12 V, but far above 11.9 V which is really > fine for every other use, and well within specs. > The new PSU had a 12 V of about 12.1 V, and that made my DVB-T FF > tuner work more reliably. Still not reliable though. > > The one to blame is the one who don't make parts that accepts > the entire spec range. Actually, a well designed item should > accept environments beyond the specs, one of the things we do > know is that parts age, and then they may go a little out of > spec.
You did read that my post had nothing to do about voltage levels, as that is as easy as riding a bike. > My new PSU had newer capacitors and maybe filters out noise > better. That might be the entire thing. Exactly my point. > >> That is not the only problem with those cards; > >> My DVB-T FF card has an impedance mismatch between the tuner > >> and the demodulator that most probably explains why its > >> reception is so much worse than my set top box. > > > > Are you saying that the manafacturer used a lot of bad components on this > > board, or just that they put in the wrong capacitor? > > They should probably have put an amp between the tuner output > and the demodulator input, I guess the best would have been > as part of the filter that sits in between. I would belive that there is already an amp in there. > > It sounds like you are getting the frequency of the power grid out on the > > composite output, at least in this context. > > I you mean power grid as in the 230 V power that is absolutely > not the case, the lines/waves are of entirely different frequencies. > I have spoken to two different persons that have both a DVB-T FF > and some other DVB-x FF card, and both had this problem on the > DVB-T card and obviously used their other cards for video out. > The problem most probably comes from the power distribution > on the card. And where does that come from? > > So the DVB-C/T cards does not have a ground shielded tin-box?, now is not > > that just lame design, the cards receive frequencies around what DVB-S > > does (at least after the LNB did it's job), and definatly higher than > > VHS+ :) or? > > DVB-C and T is in the 50-900 MHz range, DVB-S is in the 1000-1800, > that really doesn't matter to much to the design in this case. So we are still in the plenty of mhz area, hmm? > The difference I was talking about is that there are complete > tin modules with tuner and demodulators in a single readily > designed box for DVB-S, while for DVB-T and DVB-C designs > with only the tuner in a box with an analog output and the > demodulator on the board seems to be the common choise. > So far - there are intergrated tuner and demodulators for > DVB-C and T too now, maybe in a few years they will find > their way on the DVB PCI cards. Oh, so the tuner (the sensitive part) is in a tin-can and the rest is outside? > (Is there any card on the market that actually uses parts > that haven't been discontinued for at least a year? > Where do they get the parts?) Hu, what are we talking about here? The Hauppauge thread recently seen on this board? > > All in all DVB-S cards are good, DVB-C/T cards are bad? ;) > > I have no idea, but as I said there seems to be less common > with problems with the DVB-S cards. > > All in all, the DVB cards I have bought are just not well > engineered. They have caused me a lot of trouble, and every > now and then they act up in one way or another. The system > isn't reliable at all. Are you absolutly sure that this statement is accurate? I've been operating my DVB-S card for over a year without hardware flaws, and if you'd like it, I could seek some advise from friends who are running DVB with MythTV and other transmission standards than DVB-S. > > I can however go good for my Hauppauge Nexus-S, as a premium buy, > > Just watch out for connecting the video without disconnecting > everything from the power grid, or earthing everything together > first, several are those that have fried their video outputs > on their FF cards since it isn't protected from even smaller > overvoltages (as every good design of course should be). > But maybe they have finally fixed this on the Nexus cards. I did not say I used the Video out feature of this card, if you look closely I indicate that I don't use it at all, because my DVB-S card is in my server, and my frontend is booting off this server. > > as my > > only problem was that motherboard that did not follow specs, which is > > very rare. > > I wouldn't call different PCI problems on mother boards rare, > but the system tends to often work anyway. Would you say that PCI transfer errors are rare or ? Kenneth
