> De : Patrick Boettcher [mailto:patrick.boettc...@desy.de] > Envoyé : mercredi 20 mai 2009 16:17 > À : Thierry Lelegard > Cc : linux-media@vger.kernel.org > Objet : Re: RE : Hauppauge Nova-TD-500 vs. T-500 > > > On Wed, 20 May 2009, Thierry Lelegard wrote: > > 2) Since the TD-500 contains two aerial inputs instead of one for > > the T-500, I plugged in two antenna cables. Then, after some tests, > > I realized that this was a source of trouble: > > - Two antenna cables => lots of errors (mostly garbage sometimes, > > depending on the frequency). > > - Top input only => still many errors but much better on > both tuners. > > - Bottom input only => got nothing on both tuners. > > Normally there is a RF switch + loop through to be controlled when > switching between diversity (not supported in Linux) and dual-input - so > that you can connect only one antenna but still doing the dual reception.
OK, that's my fault. At first, I thought that two tuners + two inputs meant one input per tuner. When I realized it was wrong, I used only one input on each TD-500. > If this switch is not handled correctly, I could imagine that the second > input connected is "receiving" spurious signals and disturbing the first > input, but there can be a lot of other reason as well. > > If I understand the code correctly, this switch (if it is really there :) > ) is not handled correctly. I don't know the TD 500 card, so maybe the > Hauppauge guys can help on that. (Basically the question is, which GPIO is > to be toggled) The weird point is that one input works (with some errors though) and the second input does not work at all (no input TS packets at all). > > 3) There are still many uncorrectable errors (TS packets with "transport > > error indicator" set) in the input. The amount of uncorrectable errors is > > approximately 0.1% (depending on the frequency), while I do not have any > > with the T-500 using the same antenna. > > When you tune both frontends at the same time, please try to not tune the > same frequency. I don't. In my tests, I use only one frontend. In production, it could be possible that two frontends on the same TD-500 tune the same frequency for some period of time. What is the problem with that ? I have two TD-500 on the same PCI bus. The four tuners are used independently. Thanks for your time. Regards, -Thierry -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
