From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from smtp-out1.iol.cz ([194.228.2.86]) by www.linuxtv.org with esmtp (Exim 4.63) (envelope-from ) id 1K89xX-00005Y-1m for linux-dvb@linuxtv.org; Mon, 16 Jun 2008 10:21:08 +0200 Received: from ales-debian.local (unknown [88.103.120.47]) by smtp-out1.iol.cz (Postfix) with ESMTP id 103925DA32 for ; Mon, 16 Jun 2008 10:20:10 +0200 (CEST) From: Ales Jurik To: linux-dvb@linuxtv.org Date: Mon, 16 Jun 2008 10:20:04 +0200 References: <200805122042.43456.ajurik@quick.cz> <200806151920.30719.ajurik@quick.cz> <1213582905l.12580l.1l@manu-laptop> In-Reply-To: <1213582905l.12580l.1l@manu-laptop> MIME-Version: 1.0 Content-Disposition: inline Message-Id: <200806161020.05437.ajurik@quick.cz> Subject: Re: [linux-dvb] Re : Re : Re : No lock possible at some DVB-S2 channels with TT S2-3200/linux Reply-To: ajurik@quick.cz List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="iso-8859-15" Content-Transfer-Encoding: quoted-printable Sender: linux-dvb-bounces@linuxtv.org Errors-To: linux-dvb-bounces+mchehab=infradead.org@linuxtv.org List-ID: On Monday 16 of June 2008, manu wrote: > Le 15.06.2008 13:20:30, Ales Jurik a =E9crit=A0: > > 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 thes= e = transponders are all DVB-S2, 8PSK and FEC3/4. Maybe I'm not right but hope another small step forward. BR, Ales _______________________________________________ linux-dvb mailing list linux-dvb@linuxtv.org http://www.linuxtv.org/cgi-bin/mailman/listinfo/linux-dvb