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

manu eallaud at yahoo.fr
Wed Jun 4 22:19:38 CEST 2008


	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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