Op Monday 16 June 2008 10:20:04 schreef Ales Jurik: > On Monday 16 of June 2008, manu wrote: > > Le 15.06.2008 13:20:30, Ales Jurik a écrit : > > > On Sunday 15 of June 2008, Dominik Kuhlen wrote: > > > > Hi, > > > > > > > > On Thursday 22 May 2008, Ales Jurik wrote: > > > > > Hi, > > > > > > > > > > my friend told me that he is sometimes able to get lock by > > > > > > decreasing > > > > > > > > (not increasing) the frequency. Yesterday I've tested it and it > > > > > > seems to > > > > > > > > me he was right. So I'm able to get (not very stable, for few > > > > > > minutes) > > > > > > > > lock as well as by increasing and by decreasing frequency of the > > > > > > same > > > > > > > > channel (EurosportHD). > > > > > > > > The derotator code in the stb0899 seems to be setting the initial > > > > > > frequency > > > > > > > to the lowest search range and never changes this (as it should > > > > > > increase > > > > > > > steadily to find a lock) > > > > > > > > > It was also detected (not by me, I don't have riser card) that > > > > > > when the > > > > > > > > card is connected not directly into PCI slot but with some riser > > > > > > card, > > > > > > > > the needed difference for getting lock is higher (up to 10MHz). > > > > > > So > > > also > > > > > > > > some noise from PC is going into calculations. > > > > > > > > > > I don't think the problem is in computation of frequency but in > > > > > > for > > > > > > > > example not stable signal amplitude at input of demodulator or in > > > > > > not > > > > > > > > fluently changing the gain and bandwith of tuner within the band. > > > > > > As I > > > > > > > > see in the code some parameters are changing in steps and maybe 3 > > > > > > steps > > > > > > > > for whole band is not enough? Especially in real conditions (not > > > > > > in lab)? > > > > > > > Could you please try the attached patch if this fixes the problem > > > > > > with > > > > > > > nominal frequency/symbolrate settings? > > > > > > Many thanks, but I don't see any improvement. Minimum time after I've > > > lock is > > > 150s. > > > > > > The only improvement was done 2weeks ago when Manu Abraham fixed some > > > headers > > > with register addresses. From that time it is possible to get lock > > > also at > > > problematic channels but very unstable. > > > > > > But I've found that all channels with lock problems are DVB-S2, 8PSK, > > > FEC 3/4. > > > So all channels broadcasted in QPSK is possible to tune without > > > problems and > > > also channels broadcasted in DVB-S2, 8PSK, FEC 2/3 are possible to > > > tune to > > > without problems. Channels in DVB-S2, 8PSK with different FEC (to 2/3 > > > and > > > 3/4) I was not able to test. > > > > For me adding 4MHz solved the lock problems for DVB-S QPSK FEC 3/4, but > > did not solve my problems for a DVB-S QPSK FEC 5/6. > > I will try Dominik's patch to see if it improves things. > > Stay tuned (oh well) > > Bye > > Manu > > So it seems to me that there are more problem in driver that (maybe) could > be solved separately: > > 1. Some channels/transponders could be tuned by increasing/decreasing freq. > by 4-10MHz. This solution is not for me usable. I didn't find any > transponder on such solution is working. But for my friend this is working > on transponders which I'm able to tune to directly. Maybe some problem in > tolerance of TT S2-3200 components or in PC case (grounding or so). > > 2. Some channels/transponders is not possible to tune if this transponders > is choosing as first after changing satellite (by diseqc switch). This is > generally solved by users by tuning to another transponder at problematic > satellite (for me for example this two transponders use the same > modulation) - it seems not to be modulation problem (timing problem?). > > 3. At some transponders above 2 point doesn't help to get lock. For me > these transponders are all DVB-S2, 8PSK and FEC3/4. > > Maybe I'm not right but hope another small step forward. > I don't have the TT S2-3200 yet (it will arive tomorow). I do have the skystar hd2 which also has the STB0899 and the STB6100. So maybee some of this info can be usefull. With this card I have the following situations on astra 19,2: After a reboot I can't tune to any dvb-s channel. Tuning to astra hd promo at dvbs-2 11914500H does work. After that I can successfull tune to these transponders dvb-s 12574250 22000 5/6 h (bvn) dvb-s 11836500 27500 3/4 h (erste) dvb-s 12544750 22000 5/6 h (sat 1) after adding 4500 to the frequency of bvn, I can change directly to this channel after a reboot. The most important thing I can't get working is diseqc switching. Does anyone use Astra23,5 or hotbird13 with the multiproto driver? If so, please tell me which channels you can tune to successfuly so I can do my next tests on those channels. Greetings, JoepAdmiraal _______________________________________________ linux-dvb mailing list linux-dvb@xxxxxxxxxxx http://www.linuxtv.org/cgi-bin/mailman/listinfo/linux-dvb
