From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from smtp-out113.alice.it ([85.37.17.113]) by www.linuxtv.org with esmtp (Exim 4.63) (envelope-from ) id 1JdivT-0006sg-MD for linux-dvb@linuxtv.org; Mon, 24 Mar 2008 10:25:08 +0100 Message-ID: <47E7731D.7000706@alice.it> Date: Mon, 24 Mar 2008 10:23:41 +0100 From: Andrea Giuliano MIME-Version: 1.0 To: =?ISO-8859-1?Q?Morgan_T=F8rvolt?= References: <47E56272.8050307@alice.it> <3cc3561f0803230425p60486919m9685f4a145df7635@mail.gmail.com> In-Reply-To: <3cc3561f0803230425p60486919m9685f4a145df7635@mail.gmail.com> Cc: linux-dvb@linuxtv.org Subject: Re: [linux-dvb] Help needed... List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Sender: linux-dvb-bounces@linuxtv.org Errors-To: linux-dvb-bounces+mchehab=infradead.org@linuxtv.org List-ID: Dear Morgan, first of all I thank you for your kind answer, and I also thank Octavio = Ascanio and Hermann. Actually, before you answer I solved my problem in a way that seems to = me very close to your suggestion. Looking a lyngsat and kingofsat I found that every single channel found = by dvbscan is on a frequency which is just 19 or 20 units less than the = one listed on those sites. For example, 11804 on lyngsat corresponds to = 11785=3D11804-19 on the dvbscan output. So I started trying different values of frequency, but without results. = Finally, I really can't say why, I tried to change "V" to "H" ... et = voil=E0: I could be able to see RaiNews24! Then I tried exactly what you suggested: the -c option. This way I got, = with some minor problems, a list of RAI channels on 11804 and 11766, but = still with the wrong frequencies. To be precise, here is a working channels.conf file which I can now use = to watch and record RAI channels perfectly fine: nettuno1:11785:h:0:27500:519:657:3410 nettuno2:11785:h:0:27500:513:651:3410 rai1:11747:h:0:27500:512:650:3401 rai2:11747:h:0:27500:513:651:3402 rai3:11747:h:0:27500:514:652:3403 raiedu1:11785:h:0:27500:514:652:3527 raiedu2:11747:h:0:27500:518:656:3406 raigulp:11785:h:0:27500:522:663:3410 raimed:11747:h:0:27500:515:653:3404 rainews24:11785:h:0:27500:516:654:3521 senato:11747:h:0:27500:8190:92:3408 You will notice the "h" polarity. According to lyngsat, there are no = channels on "11785 H", or, if any, they definitely are not RAI channels. = The same, if I remember correctly, applies for "11747 H". My practical conclusion is: "11804 V" stands for "11875 H" and "11766 V" = stands for "11747 H". No other way to get things working. To some extents, my results are in some accord with your suggestions. = Actually, the cable should be about 30 meters long. I can't say anything = about the point 1) of your answer, but I also have many foreign channels = tuned with the wrong frequency, but the right polarity. At present it = would take a bit of time to show you some example of this, I'll dot my = best about this. Anyway, now I got a practical result, and that's a start. Many thanks and best regards. Morgan T=F8rvolt wrote: > On 22/03/2008, Andrea Giuliano wrote: >> Hi, >> >> I can szap many free channels from Hotbird 13E, but none on some >> frequencies. For example, if the "test" file just contains the line: >> >> S 11766000 V 27500000 2/3 >> >> that I took from http://www.lyngsat.com/hotbird.html as many other which >> instead work percectly, the command: >> >> scan test > channels.conf >> >> alway gives the following output: >> >> scanning prova >> using '/dev/dvb/adapter0/frontend0' and '/dev/dvb/adapter0/demux0' >> initial transponder 11766000 V 27500000 2 >> >>> tune to: 11766:v:0:27500 >> WARNING: >>> tuning failed!!! >> >>> tune to: 11766:v:0:27500 (tuning failed) >> WARNING: >>> tuning failed!!! >> ERROR: initial tuning failed >> dumping lists (0 services) >> Done. >> >> On the other hand, if I put manually some lines in channels.conf for >> such a frequency, I can zap to those channels, but in most cases I watch >> a different channel, not the one I expected to see. >> >> This doesn't happen on other frequencies. >> >> May be of some help the fact that I'm writing from Italy, and I cannot >> get channels from the scan for the most important italian channels: in >> particular, none of RAI network, nor Mediaset network, the biggest >> network in Italy. >> >> Also, the signal became rather good after I bought an amplifier. >> Actually, I can see and record perfectly fine many channels. I don't >> think I have signal strength problems. >> >> Any hint will be very much appreciated. >> >> Best regards. >> >> -- >> Andrea >> >> _______________________________________________ >> linux-dvb mailing list >> linux-dvb@linuxtv.org >> http://www.linuxtv.org/cgi-bin/mailman/listinfo/linux-dvb >> >> _______________________________________________ >> linux-dvb mailing list >> linux-dvb@linuxtv.org >> http://www.linuxtv.org/cgi-bin/mailman/listinfo/linux-dvb >> > = > Getting a different mux is only possible int a few very special cases. > 1. Your LNB is 90 degrees off, giving vertical where you should have > horizontal and vice verca. > 2. You get the wrong polarization or frequency, possibly because of a > too long cable dampening the 18V or something like that so that the > LNB does not switch. > = > This is easy to check actually. Use zap to go to the "wrong" mux, and > then use dvbscan -c (scan current mux) to get a listing of the > channels on the mux. Then locate the mux using lyngsat. You will then > see if there is a difference in polarization or frequency that can be > explained by a error in lo frequency (if the frequency is off by > 10600-9750=3D850MHz) or polarization. I am quite confident that you will > find one of these to be the case. The frequency can be a bit away from > 850MHz since the tuner is usually able to achieve sync with a lot of > offset (I have seen a tuner sync with more than 15MHz offset). > = > The error can as mentioned be caused by a long cable, but a faulty LNB > or tuner-card is of course also a possible explaination. Check if an > ordinary stb works. > = > -Morgan- -- = Andrea _______________________________________________ linux-dvb mailing list linux-dvb@linuxtv.org http://www.linuxtv.org/cgi-bin/mailman/listinfo/linux-dvb