[mythtv-users] Missing channels from Astra 28.2E

Chris Dennis cgdennis at btinternet.com
Tue May 11 15:52:41 UTC 2010


Another Sillyname wrote:
> On 10 May 2010 11:22, Chris Dennis <cgdennis at btinternet.com> wrote:
>> Chris Dennis wrote:
>>> Another Sillyname wrote:
>>>> On 9 May 2010 18:48, Chris Dennis <cgdennis at btinternet.com> wrote:
>>>>> Hello MythTV people
>>>>>
>>>>> This is a problem which I've had for a year or more, but I haven't had
>>>>> time
>>>>> until now to investigate it fully.
>>>>>
>>>>> Basically, my list of channels is incomplete, whether I use MythTV's
>>>>> scanning, or DVB-utils' 'scan' command.
>>>>>
>>>>> I'm using a Hauppauge Nova-S-Plus card, which shows up in lspci as:
>>>>>  00:08.2 Multimedia controller: Conexant Systems, Inc. CX23880/1/2/3
>>>>>  PCI Video and Audio Decoder [MPEG Port] (rev 05)
>>>>>
>>>>> The output of this command
>>>>>
>>>>>  scan -a 0 -x -1 -t 7 -U -o zap -l UNIVERSAL ./Astra-28.2E
>>>>>
>>>>> when ./Astra-28.2E contains this
>>>>>
>>>>>  S 10773000 H 22000000 5/6
>>>>>
>>>>> is this (heavily edited)
>>>>>
>>>>>  scanning ./Astra-28.2E
>>>>>  using '/dev/dvb/adapter0/frontend0' and '/dev/dvb/adapter0/demux0'
>>>>>  initial transponder 10773000 H 22000000 5
>>>>>  >>> tune to: 10773:h:0:22000
>>>>>  DVB-S IF freq is 1023000
>>>>>  0x0000 0x18af: pmt_pid 0x0000 BSkyB -- BBC THREE (not running)
>>>>>  0x0000 0x18bb: pmt_pid 0x0101 BSkyB -- BBC 1 NI (running)
>>>>>  0x0000 0x18bf: pmt_pid 0x010b BSkyB -- FIVE (running)
>>>>>  0x0000 0x189d: pmt_pid 0x0100 BSkyB -- BBC 1 London (running)
>>>>>  0x0000 0x189e: pmt_pid 0x0102 BSkyB -- BBC 2 England (running)
>>>>>  0x0000 0x18a2: pmt_pid 0x0104 BSkyB -- ETV (running)
>>>>>  0x0000 0x18a5: pmt_pid 0x0000 BSkyB -- BBC TES 2 (not running)
>>>>>  0x0000 0x18ab: pmt_pid 0x0103 BSkyB -- BBC TES 3 (running)
>>>>>  0x0000 0x18ac: pmt_pid 0x0000 BSkyB -- BBC FOUR (not running)
>>>>>  0x0000 0x18ad: pmt_pid 0x0106 BSkyB -- CBBC Channel (running)
>>>>>  0x0000 0x18ae: pmt_pid 0x0105 BSkyB -- CBeebies (running)
>>>>>  Network Name 'ASTRA'
>>>>>  ... [lots of lines snipped]
>>>>>  >>> tune to: 11953:h:0:27500 (tuning failed)
>>>>>  DVB-S IF freq is 1353500
>>>>>  WARNING: >>> tuning failed!!!
>>>>>  ... [lots more lines snipped]
>>>>>
>>>>> In other words, it finds some channels and not others.  Specifically,
>>>>> the
>>>>> information on pages such as
>>>>>  http://www.lyngsat.com/astra2b.html
>>>>> and
>>>>>  http://www.digital-kaos.co.uk/forums/f39/bbc-1-2-missing-40088/
>>>>> suggests that BBC Radio 4 (and others) should be available on
>>>>> 11953:h:027500, but I've never been able to get it.
>>>>>
>>>>> I can get other radio stations, such as BBC R5L on 10802:h:0:22000.
>>>>>
>>>>> Has anyone else experienced this?
>>>>>
>>>>> Is it likely to be the fault of the tuner card, or the LNB, or the
>>>>> direction
>>>>> the dish is pointing in?
>>>>>
>>>>> cheers
>>>>>
>>>>> Chris
>>>>> --
>>>>> Chris Dennis                                  cgdennis at btinternet.com
>>>>> Fordingbridge, Hampshire, UK
>>>>> _______________________________________________
>>>>> mythtv-users mailing list
>>>>> mythtv-users at mythtv.org
>>>>> http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users
>>>>>
>>>> Try the following....
>>>>
>>>> 11817 freq V polarity 27500 symrate
>>>> 11953 freq H polarity 27500 symrate
>>>>
>>>> See what you get
>>> I got this:
>>>
>>> scanning ./AstraTest
>>> using '/dev/dvb/adapter0/frontend0' and '/dev/dvb/adapter0/demux0'
>>> initial transponder 11817000 V 27500000 2
>>> initial transponder 11953000 H 27500000 2
>>>  >>> tune to: 11817:v:0:27500
>>> DVB-S IF freq is 1217000
>>> WARNING: >>> tuning failed!!!
>>>  >>> tune to: 11817:v:0:27500 (tuning failed)
>>> DVB-S IF freq is 1217000
>>> WARNING: >>> tuning failed!!!
>>>  >>> tune to: 11953:h:0:27500
>>> DVB-S IF freq is 1353000
>>> WARNING: >>> tuning failed!!!
>>>  >>> tune to: 11953:h:0:27500 (tuning failed)
>>> DVB-S IF freq is 1353000
>>> WARNING: >>> tuning failed!!!
>>> ERROR: initial tuning failed
>>> dumping lists (0 services)
>>> Done.
>>>
>> I've also tried manually entering the multiplex and channel details into the
>> MythTV database, but the channel that should be Radio 4 just gets 'No lock
>> (l___)'.
>>
>> Are there parameters to the cx88 modules that can be tuned to improve
>> reception?  (I can see that there are many parameters to modules such as
>> cx88xx, cx8800, cx8802, cx88_dvb etc., but I don't know which ones to tweak)
>>
>> cheers
>>
>> Chris
>>
>> --
>> Chris Dennis                                  cgdennis at btinternet.com
>> Fordingbridge, Hampshire, UK
>> _______________________________________________
>> mythtv-users mailing list
>> mythtv-users at mythtv.org
>> http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users
>>
> 
> Have you tried plugging in and old $ky box to see if it gets reception
> of the missing channels?  It'll at least let you know if it's a fault
> with the dish/LNB/alignment.

That's a good idea -- I'll have to extract said box from the loft.

I'm coming to the conclusion that the dish is slightly out of whack and 
not getting a signal from Astra 2D.  I'm planning to try adjusting it at 
the weekend (which requires a long ladder), and the Sky box might be 
helpful for displaying signal strength.

cheers

Chris


-- 
Chris Dennis                                  cgdennis at btinternet.com
Fordingbridge, Hampshire, UK


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