On 22/03/2008, Andrea Giuliano <sarkiaponius@xxxxxxxx> 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@xxxxxxxxxxx > http://www.linuxtv.org/cgi-bin/mailman/listinfo/linux-dvb > > _______________________________________________ > linux-dvb mailing list > linux-dvb@xxxxxxxxxxx > 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=850MHz) 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- _______________________________________________ linux-dvb mailing list linux-dvb@xxxxxxxxxxx http://www.linuxtv.org/cgi-bin/mailman/listinfo/linux-dvb
