Help needed...

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

WARNING: >>> 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

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Hi Andrea,

Am Samstag, den 22.03.2008, 20:48 +0100 schrieb Andrea Giuliano:

likely you better become a bit more specific on what card/tuner/channel-decoder you are, that other people might be able to confirm or deny, given the flood of new hardware around.

According to the current "tda10086 fails?" thread, I should be on some tuner for now, a tda8263, with just a minimal start up configuration.

On that Hotbird 13.0E crowd is nothing with high symbol rates so far, to the few encrypted S2 transponders I have no access and they are out of any interest for me.

However, your S 11766000 V 27500000 2/3 RAI stuff works without any problems here. The Mediaset 11919 V is OK too, except ITALIA 1 (at the moment) and the 11432 V is one of the few that fail for me too.

Without using anything more sophisticated for now, that sat stuff is a moving target it seems. Not only all that always ongoing shuffling around, also weather conditions, some even seem to stop broadcast from time to time at all and others are sometimes encrypted and sometimes not and so on.

So, interestingly, even on such a driver on bare bones for now, not only driver optimization, but simple scan file update can do a lot, brought 394 new TV and radio services for now.

The road is much better paved as claimed, will have some beer now ;)

Cheers,
Hermann

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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-

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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=11804-19 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 voilà: 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.

Andrea


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Il Monday 24 March 2008 10:23:41 Andrea Giuliano ha scritto:

this sounds very much like a bug in the drivers. What card is it and what tuner and demodulator does it use?

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My card is a KWorld DVB-S 100, sold in Italy as Empire DVB-S 100. As for tuner and demodulator, I'm not an expert so I can only provide this slice of dmesg:

cx2388x dvb driver version 0.0.6 loaded
CORE cx88[0]: subsystem: 17de:08b2, board: KWorld DVB-S 100 [card=39,autodetected]
TV tuner 4 at 0x1fe, Radio tuner -1 at 0x1fe
cx2388x v4l2 driver version 0.0.6 loaded
irda_init()
NET: Registered protocol family 23
logips2pp: Detected unknown logitech mouse model 127
ACPI: PCI Interrupt 0000:01:02.2[A] -> GSI 23 (level, low) -> IRQ 193 cx88[0]/2: found at 0000:01:02.2, rev: 5, irq: 193, latency: 32, mmio:
0xfd000000
cx88[0]/2: cx2388x based dvb card
DVB: registering new adapter (cx88[0]).
DVB: registering frontend 0 (Conexant CX24123/CX24109)...
ACPI: PCI Interrupt 0000:01:02.0[A] -> GSI 23 (level, low) -> IRQ 193 cx88[0]/0: found at 0000:01:02.0, rev: 5, irq: 193, latency: 32, mmio:
0xfc000000
cx88[0]/0: registered device video0 [v4l2]
cx88[0]/0: registered device vbi0
ZORAN: 1 card(s) found
DC30plus[0]: zr36057_init() - initializing card[0], zr=f8a37c60 cx2388x blackbird driver version 0.0.6 loaded

The Zoran card you see mentioned above has no DVB capabilities: it's a rather old MJPEG card (and a rather good one, indeed).

I hope this helps.

Best regards.

Andrea

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