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Can't get lock on some channels

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julius at msa

Jul 9, 2010, 11:31 PM

Post #1 of 8 (877 views)
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Can't get lock on some channels

Hi,

Just wondering if anyone has come across this. When I try to change channels, some channels are not getting a lock eg:
1035, 1036, 1038, 1904, 1908, 1909

These work:
1910
1920
1921
1922
1923
1924
1925
1926
1927
1928
1931
1940

I guess I figured that either all would work or none. Any ideas?

Thanks in advance.

Regards,
Julius.

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stevehodge at gmail

Jul 10, 2010, 12:16 AM

Post #2 of 8 (848 views)
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Re: Can't get lock on some channels [In reply to]

On Sat, Jul 10, 2010 at 6:31 PM, Julius Spencer <julius [at] msa> wrote:

> Hi,
>
> Just wondering if anyone has come across this. When I try to change
> channels, some channels are not getting a lock eg:
> 1035, 1036, 1038, 1904, 1908, 1909
>
> These work:
> 1910
> 1920
> 1921
> 1922
> 1923
> 1924
> 1925
> 1926
> 1927
> 1928
> 1931
> 1940
>

What are they, DVB-S pids?

If this is a Freeview satellite system then it looks like the working pids
are on one multiplex and non-working pids are on the other. My guess is that
one of your multiplexes isn't correctly setup. But it's hard to say since
you've given us no information on what your system is like.

Cheers,
Steve

julius at msa

Jul 10, 2010, 12:51 AM

Post #3 of 8 (849 views)
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Re: Can't get lock on some channels [In reply to]

On 10/07/2010, at 7:16 PM, Steve Hodge wrote:

> On Sat, Jul 10, 2010 at 6:31 PM, Julius Spencer <julius [at] msa> wrote:
> Hi,
>
> Just wondering if anyone has come across this. When I try to change channels, some channels are not getting a lock eg:
> 1035, 1036, 1038, 1904, 1908, 1909
>
> These work:
> 1910
> 1920
> 1921
> 1922
> 1923
> 1924
> 1925
> 1926
> 1927
> 1928
> 1931
> 1940
>
> What are they, DVB-S pids?
>
> If this is a Freeview satellite system then it looks like the working pids are on one multiplex and non-working pids are on the other. My guess is that one of your multiplexes isn't correctly setup. But it's hard to say since you've given us no information on what your system is like.
>
> Cheers,
> Steve

Hi Steve,

Thank you for the reply. I'm using Mythdora and DVB-S on a Nova-S-Plus. If more information is required please let me know. Sorry for the lack of info - wasn't sure what would help. I think that sounds about right - do you know where the multiplexes are configured? (I'm guessing somewhere in MyhtTv setup...

Regards,
Julius.
> _______________________________________________
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> mythtvnz [at] lists
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stevehodge at gmail

Jul 10, 2010, 2:36 AM

Post #4 of 8 (839 views)
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Re: Can't get lock on some channels [In reply to]

On Sat, Jul 10, 2010 at 7:51 PM, Julius Spencer <julius [at] msa> wrote:

>
> On 10/07/2010, at 7:16 PM, Steve Hodge wrote:
>
> > On Sat, Jul 10, 2010 at 6:31 PM, Julius Spencer <julius [at] msa>
> wrote:
> > Hi,
> >
> > Just wondering if anyone has come across this. When I try to change
> channels, some channels are not getting a lock eg:
> > 1035, 1036, 1038, 1904, 1908, 1909
> >
> > These work:
> > 1910
> > 1920
> > 1921
> > 1922
> > 1923
> > 1924
> > 1925
> > 1926
> > 1927
> > 1928
> > 1931
> > 1940
> >
> > What are they, DVB-S pids?
> >
> > If this is a Freeview satellite system then it looks like the working
> pids are on one multiplex and non-working pids are on the other. My guess is
> that one of your multiplexes isn't correctly setup. But it's hard to say
> since you've given us no information on what your system is like.
> >
> > Cheers,
> > Steve
>
> Hi Steve,
>
> Thank you for the reply. I'm using Mythdora and DVB-S on a Nova-S-Plus. If
> more information is required please let me know. Sorry for the lack of info
> - wasn't sure what would help. I think that sounds about right - do you know
> where the multiplexes are configured? (I'm guessing somewhere in MyhtTv
> setup...
>

It should all happen automatically when you do a channel scan. I'd try to
tune the two multiplexes from the shell, e.g. with:
dvbtune -f 1183000 -s 22500 -p h -m
1183000 is the intermediate frequency from the LNB. The two multiplex
frequencies are 12456000kHz and 12483000kHz - subtract your LNB local
oscillator frequency from these to get the intermediate frequency to use. In
my case my LNB (an old Sky installed one) has a frequency of 11300000.

If you can lock the two frequencies with dvbtune then myth must be
misconfigured. Easiest might be to just rescan. If you can't lock one of the
frequencies from the command line then something else is the problem -
hardware or driver most likely.

Cheers,
Steve

nick.rout at gmail

Jul 10, 2010, 2:30 PM

Post #5 of 8 (829 views)
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Re: Can't get lock on some channels [In reply to]

On Sat, Jul 10, 2010 at 9:36 PM, Steve Hodge <stevehodge [at] gmail> wrote:
> On Sat, Jul 10, 2010 at 7:51 PM, Julius Spencer <julius [at] msa> wrote:
>>
>> On 10/07/2010, at 7:16 PM, Steve Hodge wrote:
>>
>> > On Sat, Jul 10, 2010 at 6:31 PM, Julius Spencer <julius [at] msa>
>> > wrote:
>> > Hi,
>> >
>> > Just wondering if anyone has come across this. When I try to change
>> > channels, some channels are not getting a lock eg:
>> > 1035, 1036, 1038, 1904, 1908, 1909
>> >
>> > These work:
>> > 1910
>> > 1920
>> > 1921
>> > 1922
>> > 1923
>> > 1924
>> > 1925
>> > 1926
>> > 1927
>> > 1928
>> > 1931
>> > 1940
>> >
>> > What are they, DVB-S pids?
>> >
>> > If this is a Freeview satellite system then it looks like the working
>> > pids are on one multiplex and non-working pids are on the other. My guess is
>> > that one of your multiplexes isn't correctly setup. But it's hard to say
>> > since you've given us no information on what your system is like.
>> >
>> > Cheers,
>> > Steve
>>
>> Hi Steve,
>>
>> Thank you for the reply. I'm using Mythdora and DVB-S on a Nova-S-Plus. If
>> more information is required please let me know. Sorry for the lack of info
>> - wasn't sure what would help. I think that sounds about right - do you know
>> where the multiplexes are configured? (I'm guessing somewhere in MyhtTv
>> setup...
>
> It should all happen automatically when you do a channel scan. I'd try to
> tune the two multiplexes from the shell, e.g. with:
> dvbtune -f 1183000 -s 22500 -p h -m
> 1183000 is the intermediate frequency from the LNB. The two multiplex
> frequencies are 12456000kHz and 12483000kHz - subtract your LNB local
> oscillator frequency from these to get the intermediate frequency to use. In
> my case my LNB (an old Sky installed one) has a frequency of� 11300000.
>
> If you can lock the two frequencies with dvbtune then myth must be
> misconfigured. Easiest might be to just rescan. If you can't lock one of the
> frequencies from the command line then something else is the problem -
> hardware or driver most likely.
>

At one stage there was a bug whereby the polarity (Vert or Horiz) got
switched in the database. Check they are set right on all channels!

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julius at msa

Jul 11, 2010, 1:39 AM

Post #6 of 8 (825 views)
Permalink

Re: Can't get lock on some channels [In reply to]

Hi Steve,

> It should all happen automatically when you do a channel scan. I'd try to tune the two multiplexes from the shell, e.g. with:
> dvbtune -f 1183000 -s 22500 -p h -m
> 1183000 is the intermediate frequency from the LNB. The two multiplex frequencies are 12456000kHz and 12483000kHz - subtract your LNB local oscillator frequency from these to get the intermediate frequency to use. In my case my LNB (an old Sky installed one) has a frequency of 11300000.
>
> If you can lock the two frequencies with dvbtune then myth must be misconfigured. Easiest might be to just rescan. If you can't lock one of the frequencies from the command line then something else is the problem - hardware or driver most likely.

I tried the following:
(Does this look right? Thanks again.)

./dvbtune -f 1706000 -s 22500 -p h -m
Using DVB card "Conexant CX24123/CX24109"
tuning DVB-S to L-Band:134543876, Pol:H Srate=22500000, 22kHz=off
ERROR setting tone
: Invalid argument
polling....
Getting frontend event
FE_STATUS:
polling....
Getting frontend event
FE_STATUS: FE_HAS_SIGNAL
polling....
Getting frontend event
FE_STATUS: FE_HAS_SIGNAL FE_HAS_LOCK FE_HAS_CARRIER FE_HAS_VITERBI FE_HAS_SYNC
Bit error rate: 0
Signal strength: 2816
SNR: 65182
FE_STATUS: FE_HAS_SIGNAL FE_HAS_LOCK FE_HAS_CARRIER FE_HAS_VITERBI FE_HAS_SYNC
FE READ UNCORRECTED BLOCKS: : Operation not supported
Signal=2816, Verror=0, SNR=65125dB, BlockErrors=0, (S|L|C|V|SY|)
FE READ UNCORRECTED BLOCKS: : Operation not supported

(^^^^^^^^^^This went on...)

./dvbtune -f 1733000 -s 22500 -p h -m
Using DVB card "Conexant CX24123/CX24109"
tuning DVB-S to L-Band:134543876, Pol:H Srate=22500000, 22kHz=off
ERROR setting tone
: Invalid argument
polling....
Getting frontend event
FE_STATUS:
polling....
Getting frontend event
FE_STATUS: FE_HAS_SIGNAL
polling....
Getting frontend event
FE_STATUS: FE_HAS_SIGNAL FE_HAS_LOCK FE_HAS_CARRIER FE_HAS_VITERBI FE_HAS_SYNC
Bit error rate: 0
Signal strength: 2816
SNR: 65051
FE_STATUS: FE_HAS_SIGNAL FE_HAS_LOCK FE_HAS_CARRIER FE_HAS_VITERBI FE_HAS_SYNC
FE READ UNCORRECTED BLOCKS: : Operation not supported
Signal=2816, Verror=0, SNR=65155dB, BlockErrors=0, (S|L|C|V|SY|)
FE READ UNCORRECTED BLOCKS: : Operation not supported
Signal=2816, Verror=0, SNR=65208dB, BlockErrors=0, (S|L|C|V|SY|)
FE READ UNCORRECTED BLOCKS: : Operation not supported

(^^^^^^^^^^This went on...)

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stevehodge at gmail

Jul 11, 2010, 3:05 AM

Post #7 of 8 (817 views)
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Re: Can't get lock on some channels [In reply to]

On Sun, Jul 11, 2010 at 8:39 PM, Julius Spencer <julius [at] msa> wrote:

> FE_STATUS: FE_HAS_SIGNAL FE_HAS_LOCK FE_HAS_CARRIER FE_HAS_VITERBI
> FE_HAS_SYNC
>

You're getting lock on both multiplexes so it must be something in Myth.
Nick's suggestion that the polarity of one of the multiplexes might be wrong
makes sense.

Cheers,
Steve

julius at msa

Jul 31, 2010, 5:00 PM

Post #8 of 8 (689 views)
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Re: Can't get lock on some channels [In reply to]

Hi,

Ok so I'm still not any further with this - but I have more information:
So I have a Nova-S-Plus and the cable is running directly from the dish to the card. The dish is correctly aligned. I can get a lock on 12456000 but not on 12483000 in the mythtvsetup. Yesterday morning I could get a lock on 12483000 and it worked for about an hour. Why it stopped working... I don't know.

I'm starting to wonder if there's something wrong with my DVB card. Is anyone else using this card with mythdora? (Maybe I should try a different distro or card...)

I read the following site:
http://www.wlug.org.nz/FreeViewMythTvSetup

which indicated that perhaps I had a cabling issue due to receiving the following:

./dvbtune -f 1733000 -s 22500 -p h -m -tone 0
Using DVB card "Conexant CX24123/CX24109"
tuning DVB-S to L-Band:0, Pol:H Srate=22500000, 22kHz=off
polling....
Getting frontend event
FE_STATUS:
polling....
Getting frontend event
FE_STATUS: FE_HAS_SIGNAL
polling....
Getting frontend event
FE_STATUS: FE_HAS_SIGNAL FE_HAS_CARRIER
polling....
Getting frontend event
FE_STATUS: FE_HAS_SIGNAL
polling....
Getting frontend event
FE_STATUS: FE_HAS_SIGNAL FE_HAS_CARRIER
polling....

and not getting (something like):
FE_STATUS: FE_HAS_SIGNAL FE_HAS_LOCK FE_HAS_CARRIER FE_HAS_VITERBI FE_HAS_SYNC
Signal=50823, Verror=0, SNR=52983dB, BlockErrors=0, (S|L|C|V|SY|)
Signal=50931, Verror=0, SNR=53001dB, BlockErrors=0, (S|L|C|V|SY|)

So I checked the dish alignment and cabling, but it all seems fine. I find that the signal is at 98% but the S/N is flickering between 4.6, 4.7 and 4.8 dB.

dmesg looks fine to me:

cx88/2: cx2388x MPEG-TS Driver Manager version 0.0.6 loaded
cx2388x alsa driver version 0.0.6 loaded
cx88/0: cx2388x v4l2 driver version 0.0.6 loaded

cx88[0]: subsystem: 0070:9202, board: Hauppauge Nova-S-Plus DVB-S [card=37,autodetected]
cx88[0]: TV tuner type 4, Radio tuner type -1
tveeprom 1-0050: Hauppauge model 92001, rev C1B1, serial# 3298616
tveeprom 1-0050: MAC address is 00-0D-FE-32-55-38
tveeprom 1-0050: tuner model is Conexant_CX24109 (idx 111, type 4)
tveeprom 1-0050: TV standards ATSC/DVB Digital (eeprom 0x80)
tveeprom 1-0050: audio processor is CX883 (idx 32)
tveeprom 1-0050: decoder processor is CX883 (idx 22)
tveeprom 1-0050: has no radio, has IR receiver, has no IR transmitter
cx88[0]: hauppauge eeprom: model=92001
input: cx88 IR (Hauppauge Nova-S-Plus as /devices/pci0000:00/0000:00:1e.0/0000:02:02.2/input/input6
cx88[0]/2: cx2388x 8802 Driver Manager
cx88-mpeg driver manager 0000:02:02.2: PCI INT A -> GSI 17 (level, low) -> IRQ 17
cx88[0]/2: found at 0000:02:02.2, rev: 5, irq: 17, latency: 64, mmio: 0xfa000000
cx8800 0000:02:02.0: PCI INT A -> GSI 17 (level, low) -> IRQ 17
cx88[0]/0: found at 0000:02:02.0, rev: 5, irq: 17, latency: 64, mmio: 0xf8000000
cx88[0]/0: registered device video0 [v4l2]
cx88[0]/0: registered device vbi0
cx88_audio 0000:02:02.1: PCI INT A -> GSI 17 (level, low) -> IRQ 17
cx88[0]/1: CX88x/0: ALSA support for cx2388x boards
cx88/2: cx2388x dvb driver version 0.0.6 loaded
cx88/2: registering cx8802 driver, type: dvb access: shared
cx88[0]/2: subsystem: 0070:9202, board: Hauppauge Nova-S-Plus DVB-S [card=37]
cx88[0]/2: cx2388x based DVB/ATSC card
CX24123: detected CX24123
DVB: registering new adapter (cx88[0])
DVB: registering frontend 0 (Conexant CX24123/CX24109)...

If you have seen this or have a good idea for what to try next I would be most grateful. I might be able to test with a Hauppage HVR-3000 card.

Regards,
Julius.

On 11/07/2010, at 10:05 PM, Steve Hodge wrote:

> On Sun, Jul 11, 2010 at 8:39 PM, Julius Spencer <julius [at] msa> wrote:
> FE_STATUS: FE_HAS_SIGNAL FE_HAS_LOCK FE_HAS_CARRIER FE_HAS_VITERBI FE_HAS_SYNC
>
> You're getting lock on both multiplexes so it must be something in Myth. Nick's suggestion that the polarity of one of the multiplexes might be wrong makes sense.
>
> Cheers,
> Steve
> _______________________________________________
> mythtvnz mailing list
> mythtvnz [at] lists
> http://lists.ourshack.com/mailman/listinfo/mythtvnz
> Archives http://www.gossamer-threads.com/lists/mythtv/mythtvnz/

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