[mythtvnz] Problems with DVB-T

[Pshem Kowalczyk]

On 4 February 2010 16:37, Jonathan Hoskin <jonathan.hoskin at gmail.com> wrote:
>>
>> Is there a way to check it remotely using CLI? It might me take some
>> time to get to the screen :-)
>>
>
> Try dvbtune:
> dvbtune -f 570000 -I 0 -qam 64 -gi 16 -cr 3_4 -bw 8 -tm 8 -m 1

Ok, That's what i'm getting on the first card:

mamaku src # dvbtune -c 1 -f 570000 -I 0 -qam 64 -gi 16 -cr 3_4 -bw 8 -tm 8 -m 1
Using DVB card "DiBcom 7000PC"
tuning DVB-T (in United Kingdom) to 570000000 Hz
polling....
Getting frontend event
FE_STATUS:
polling....
Getting frontend event
FE_STATUS: FE_HAS_SIGNAL FE_HAS_LOCK FE_HAS_CARRIER FE_HAS_VITERBI FE_HAS_SYNC
Event:  Frequency: 580600000
        SymbolRate: 0
        FEC_inner:  3

Bit error rate: 0
Signal strength: 46812
SNR: 264
FE_STATUS: FE_HAS_SIGNAL FE_HAS_LOCK FE_HAS_CARRIER FE_HAS_VITERBI FE_HAS_SYNC
Signal=46813, Verror=0, SNR=254dB, BlockErrors=0, (S|L|C|V|SY|)
Signal=46783, Verror=0, SNR=246dB, BlockErrors=0, (S|L|C|V|SY|)
Signal=46768, Verror=0, SNR=264dB, BlockErrors=0, (S|L|C|V|SY|)
Signal=46753, Verror=0, SNR=250dB, BlockErrors=0, (S|L|C|V|SY|)
Signal=46748, Verror=0, SNR=280dB, BlockErrors=0, (S|L|C|V|SY|)
Signal=46743, Verror=0, SNR=272dB, BlockErrors=0, (S|L|C|V|SY|)
Signal=46742, Verror=0, SNR=250dB, BlockErrors=0, (S|L|C|V|SY|)
Signal=46744, Verror=0, SNR=266dB, BlockErrors=0, (S|L|C|V|SY|)
Signal=46733, Verror=0, SNR=267dB, BlockErrors=0, (S|L|C|V|SY|)
Signal=46745, Verror=0, SNR=252dB, BlockErrors=0, (S|L|C|V|SY|)
Signal=46739, Verror=0, SNR=260dB, BlockErrors=0, (S|L|C|V|SY|)

and second card:
mamaku src # dvbtune -c 2 -f 570000 -I 0 -qam 64 -gi 16 -cr 3_4 -bw 8 -tm 8 -m 1
Using DVB card "DiBcom 7000PC"
tuning DVB-T (in United Kingdom) to 570000000 Hz
polling....
Getting frontend event
FE_STATUS:
polling....
Getting frontend event
FE_STATUS: FE_HAS_SIGNAL FE_HAS_LOCK FE_HAS_CARRIER FE_HAS_VITERBI FE_HAS_SYNC
Event:  Frequency: 580600000
        SymbolRate: 0
        FEC_inner:  3

Bit error rate: 0
Signal strength: 46106
SNR: 274
FE_STATUS: FE_HAS_SIGNAL FE_HAS_LOCK FE_HAS_CARRIER FE_HAS_VITERBI FE_HAS_SYNC
Signal=46102, Verror=0, SNR=256dB, BlockErrors=0, (S|L|C|V|SY|)
Signal=46113, Verror=0, SNR=275dB, BlockErrors=0, (S|L|C|V|SY|)
Signal=46129, Verror=0, SNR=282dB, BlockErrors=0, (S|L|C|V|SY|)
Signal=46117, Verror=0, SNR=260dB, BlockErrors=0, (S|L|C|V|SY|)
Signal=46115, Verror=0, SNR=276dB, BlockErrors=0, (S|L|C|V|SY|)
Signal=46113, Verror=0, SNR=299dB, BlockErrors=0, (S|L|C|V|SY|)
Signal=46117, Verror=0, SNR=273dB, BlockErrors=0, (S|L|C|V|SY|)
Signal=46106, Verror=0, SNR=258dB, BlockErrors=0, (S|L|C|V|SY|)
Signal=46086, Verror=0, SNR=257dB, BlockErrors=0, (S|L|C|V|SY|)


In myth I'm getting signal between 72% and 74% on both cards,
regardless which socket I plug the cable in. Using external splitter
(and running two cables) seems to marginally reduce signal on the card
that was getting higher signal. Myth displays BER of 65535 which
suggests that it's either not implemented or not working correctly.
There is no problem with live tv, though. On any of the inputs/cards.
Last night news recorded and played without any problems. I'll
continue to experiment with various settings, perhaps I can figure out
what's causing it.

kind regards
Pshem