[linux-dvb] Pinnacle PCTV Sat HDTV Pro USB (452e) packet loss

John Goacher linuxdvb at johngoacher.co.uk
Wed Dec 19 11:25:39 CET 2007


Manu Abraham wrote:

> John Goacher wrote:
>> Tony Grant wrote:
>>
>>> Le vendredi 14 décembre 2007 à 13:49 +0000, John Goacher a écrit :
>>>
>>>> Your success with Das Erste prompted me to
>>>> temporarily re-align my dish (Sky minidish) to point to 19.2E to see if
>>>> I could duplicate your results. The good news is that I get a
>>>> perfect recording from Das Erste. I recorded about 15 minutes of data,
>>>> then
>>>> ran it through TSReader Lite to check for errors. There were absolutely
>>>> no
>>>> errors of any kind indicated ! I double checked this by viewing the
>>>> recording in DVBViewer Pro under XP.
>>>>
>>>> This is interesting because the signal strength from Das Erste (as
>>>> displayed
>>>> by DVBViewer Pro under Windows XP) is much lower than I'm getting from
>>>> Astra
>>>> 28.2E (I'm based in the London area). Das Erste displays a signal
>>>> strength
>>>> reading
>>>> of 41%, whereas the BBC channels at 28.2E (on which I'me seeing high
>>>> error
>>>> rates)
>>>> show signal strengths of around 65%. I think this probably rules out
>>>> signal
>>>> quality as
>>>> the issue, and suggests the problem is somehow related to the channel
>>>> parameters.
>>> I have issues with 28.2E compared to 19.2E and always have had. 19.2
>>> just works whereas 28.2 is much more finicky. Last week a big storm
>>> cloud over the Pyreneans blocked all signal for about 10 minutes - BBC2
>>> just stopped and it is one of the better signals. During thunder storms
>>> on 19.2 you have some artifacts but I have never lost the carrier.
>>>
>>
>> Hi Tony,
>>
>> I take your point, but the fact that I can receive the 28.2E channels
>> perfectly with the PCTV under Windows XP, but not under linux (with the 
>> same
>> hardware and feed), strongly suggests the problem is not signal quality.
>> Similarly, the fact that I can receive Das Erste perfectly under linux,
>> despite the signal from 19.2E being much weaker at my location, also
>> suggests this.
>>
>
> When i looked at the pctv452 driver it was based on a older stb0899 driver 
> snapshot.
> It still is based on the same ? There were many issues fixed in newer 
> changesets, so
> i don't know whether the issue that you see is really a stb0899 driver 
> issue which has
> been fixed already or maybe that the pctv device requires some specific 
> settings ? I
> don't know.. I don't have much info on this device.
>
> Regards,
> Manu
>

Hi Manu,

I was using an older snapshot, but I've now rebuilt and re-installed the 
driver following the instructions in the wiki entry at 
http://www.linuxtv.org/wiki/index.php/Pinnacle_PCTV_Sat_HDTV_Pro_USB_%28452e%29

I'm using what I believe to be the latest snapshot of STB0899 which is 
revision 5882 at http://linuxtv.org/hg/~manu/stb0899/rev/5b19ac1cddb5

Unfortunately, I still get the packet loss problem with this snapshot.

regards,
John 




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