[linux-dvb] No lock on a particular transponder with TT S2-3200

[linux-dvb] No lock on a particular transponder with TT S2-3200

[manu]

	Hi all,
one more datapoint for the TT 3200 tuning problems. I solved all my 
locking problems by add 4MHz to the reported frequencies (coming from 
the stream tables); note that one of the transponders always locked 
even without this correction (its freq is 11093MHz, the others are : 
11555, 11635, 11675MHz), so as you see the others are much higher.
Now there is another transponder at 11495MHz but this one I cant lock 
on it even with my correction. Here are its characteristic as reported 
by dvbsnoop when tuned to another transponder by szap:
    Transport_stream_ID: 605 (0x025d)
    Original_network_ID: 1 (0x0001)  [= Astra Satellite Network 19,2°E 
| Société Européenne des Satellites]
    reserved_1: 15 (0x0f)
    Transport_descriptor_length: 13 (0x000d)

            DVB-DescriptorTag: 67 (0x43)  [= 
satellite_delivery_system_descriptor]
            descriptor_length: 11 (0x0b)
              0000:  43 0b 01 14 95 00 32 55  a1 03 00 00 04            
C.....2U.....
            Frequency: 18126080 (=  11.49500 GHz)
            Orbital_position: 12885 (= 325.5)
            West_East_flag: 1 (0x01)  [= EAST]
            Polarisation: 1 (0x01)  [= linear - vertical]
            Kind: 0 (0x00)  [= DVB-S]
            fixed ('00'): 0 (0x00)
            Modulation_type: 1 (0x01)  [= QPSK]
            Symbol_rate: 3145728 (=  30.0000)
            FEC_inner: 4 (0x04)  [= 5/6 conv. code rate]

The difference between this one and the 4 other transponders I can lock 
on is that this one has a different FEC (5/6) and the channels on it 
are HD, but it is still DVB-S.
I know it works with my STB, so something is wrong here.
I would like to hack on szap or scan to be able to try several freq on 
a row and get the logs from it. I will post the result ASAP.
IIRC szapping to the bad channel I get no lock but in the dmesg lock it 
seems to get the carrier, weird...
I hope someone can make some sense out of that.
Oh and I am using multiproto as of just before the API change that 
broke mythtv compat but I backported some fixes.
Bye
Manu


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Re: [linux-dvb] No lock on a particular transponder with TT S2-3200

[Ales Jurik]

On Wednesday 04 of June 2008, manu wrote:
> 	Hi all,
> one more datapoint for the TT 3200 tuning problems. I solved all my
> locking problems by add 4MHz to the reported frequencies (coming from
> the stream tables); note that one of the transponders always locked
> even without this correction (its freq is 11093MHz, the others are :
> 11555, 11635, 11675MHz), so as you see the others are much higher.
> Now there is another transponder at 11495MHz but this one I cant lock
> on it even with my correction. 

Hi,

I have a little more problems with TT S2-3200 under linux. At DVB-S exists 
transponders to which is not possible to switch directly (when changing 
satellite), it is necessary to tune first to another transponder at same 
position (I'm using diseqc switch). At these transponders changing the 
frequency is not helpful.

At DVB-S2 transponders are some transponders at which is possible to get lock 
without problems. Also at some transponders it is possible to get lock when 
changing frequency by 4-5MHz after some minutes (typically 2 min.). But there 
exists some transponders where is practically impossible to get lock. 
Interesting is that those problematic transponders were without problems 
receivable some time ago. The change appeared when transponders were switched 
from Thor2 to Thor5 (same frequency but only FEC changed from 2/3 to 3/4 and 
pilot was switched off), also one transponder at HB 13.0E which was 
receivable two months ago is not receivable any more (don't know if pilot was 
switched off but other paremeters are the same).

So now I'm able to get lock on less then half of DVB-S2 HD programs which I'm 
able to watch. This is not very funny situation, even if all of these 
programs are without any problem receivable at the same PC but under Windows. 
So I'm nearly sure that problem is in driver.

If I could be helpful with debugging and testing I'll glad to cooperate.

BR,

Ales


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[linux-dvb] Re : No lock on a particular transponder with TT S2-3200

[manu]

Le 05.06.2008 14:47:29, Ales Jurik a écrit :
> On Wednesday 04 of June 2008, manu wrote:
> > 	Hi all,
> > one more datapoint for the TT 3200 tuning problems. I solved all my
> > locking problems by add 4MHz to the reported frequencies (coming
> from
> > the stream tables); note that one of the transponders always locked
> > even without this correction (its freq is 11093MHz, the others 
> are :
> > 11555, 11635, 11675MHz), so as you see the others are much higher.
> > Now there is another transponder at 11495MHz but this one I cant
> lock
> > on it even with my correction. 
> 
> Hi,
> 
> I have a little more problems with TT S2-3200 under linux. At DVB-S
> exists 
> transponders to which is not possible to switch directly (when
> changing 
> satellite), it is necessary to tune first to another transponder at
> same 
> position (I'm using diseqc switch). At these transponders changing 
> the
> 
> frequency is not helpful.
> 
> At DVB-S2 transponders are some transponders at which is possible to
> get lock 
> without problems. Also at some transponders it is possible to get 
> lock
> when 
> changing frequency by 4-5MHz after some minutes (typically 2 min.).
> But there 
> exists some transponders where is practically impossible to get lock. 
> Interesting is that those problematic transponders were without
> problems 
> receivable some time ago. The change appeared when transponders were
> switched 
> from Thor2 to Thor5 (same frequency but only FEC changed from 2/3 to
> 3/4 and 
> pilot was switched off), also one transponder at HB 13.0E which was 
> receivable two months ago is not receivable any more (don't know if
> pilot was 
> switched off but other paremeters are the same).
> 

Well so this would point to a problem involving FEC. But is that a 
problem to get a lock? I mean FEC is just involved after a successful 
tuning, right? So even tuning is a problem IMHO and FEC might be 
another one.
I hope that someone else can elaborate/confirm or not.
Bye
Manu


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Re: [linux-dvb] No lock on a particular transponder with TT S2-3200

[Dominik Kuhlen]

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On Wednesday 04 June 2008, manu wrote:
> 	Hi all,
> one more datapoint for the TT 3200 tuning problems. I solved all my 
> locking problems by add 4MHz to the reported frequencies (coming from 
> the stream tables); note that one of the transponders always locked 
> even without this correction (its freq is 11093MHz, the others are : 
> 11555, 11635, 11675MHz), so as you see the others are much higher.
> Now there is another transponder at 11495MHz but this one I cant lock 
> on it even with my correction. Here are its characteristic as reported 
---snip---
According to 
http://www.ses-astra.com/consumer/de/Sender/senderlisten/2001_20080603_pdf.pdf
this transponder is analog TV with some ADRs.


 Dominik

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Re: [linux-dvb] Re : No lock on a particular transponder with TT S2-3200

[Ales Jurik]

On Thursday 05 of June 2008, manu wrote:
> Well so this would point to a problem involving FEC. But is that a
> problem to get a lock? I mean FEC is just involved after a successful
> tuning, right? So even tuning is a problem IMHO and FEC might be
> another one.
> I hope that someone else can elaborate/confirm or not.
> Bye
> Manu

Well, I've tried to confirm wheather or not some values of FEC disables the 
successful lock. I've found transponder in DVB-S2 which is receivable 
immediately after tuning to with the same FEC (3/4). But I've found that all 
transponders on which I'm not able to get lock have FEC eq to 2/3 or 3/4 and 
modulation of type 8PSK. Transponders with FEC 3/4 and modulation QPSK are 
receivable without problem.

I'll be very glad if someone else could confirm or disagree with my tests as I 
didn't do test tuning on all DVB-S2 channels. 

BR,

Ales

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[linux-dvb] Re : No lock on a particular transponder with TT S2-3200

[manu]

Le 05.06.2008 16:23:10, Dominik Kuhlen a écrit :
> On Wednesday 04 June 2008, manu wrote:
> > 	Hi all,
> > one more datapoint for the TT 3200 tuning problems. I solved all my 
> > locking problems by add 4MHz to the reported frequencies (coming
> from 
> > the stream tables); note that one of the transponders always locked 
> > even without this correction (its freq is 11093MHz, the others 
> are :
> 
> > 11555, 11635, 11675MHz), so as you see the others are much higher.
> > Now there is another transponder at 11495MHz but this one I cant
> lock 
> > on it even with my correction. Here are its characteristic as
> reported 
> ---snip---
> According to 
> http://www.ses-astra.com/consumer/de/Sender/
> senderlisten/2001_20080603_pdf.pdf
> this transponder is analog TV with some ADRs.
> 

Actually if you look at the position, the sat is intelsat-9
3 (somewhere above south america, I am located in the caribbean; I know 
that there is a mention of an astra sat, but this is just a confusion.
Thx
Bye
Manu


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