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

Manu Abraham abraham.manu at gmail.com
Tue Dec 18 23:47:37 CET 2007

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.


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