[linux-dvb] Re: My DVB-c patch

[Holger Waechtler <holger@convergence.de>]

Dennis Noordsij wrote:
> Hi,
>
> Finally got around to doing a clean start, testing one card at a time, then 2, 
> different cable setups, etc. Here's the result:
>
> One antenna cable was intermittently faulty. I can't believe this one. 
> Continuity, no continuity. (Finnish fans: one word: Biltema :-)
>
> Antenna signal splitter, active (i.e. booster). Lowers verror rate, but 
> introduces random blockerrors (when running dvbtune -m, which updates once 
> per second? about 1-2 blockerrors every few runs) - and in addition seems to 
> burp every 10 seconds or so causing the entire picture on both cards to 
> pixelate (blockerror=64).
>
> Now, after using only passive splitters, and working cables, both cards tune 
> perfectly! I mean all frequencies, symbolrates, and QAM settings. I have 
> zigzagging and frequency bending disabled, the AFC can compensate for about 2 
> stepsizes either way of the ideal frequency, and it locks immediately and 
> without fail. 
> Verror seems to be too high (also it fluctuates a lot when running xawtv or 
> not, and waving my arms up and down really fast, etc), between 500 and 
> 200000. In several hours of testing in every way I could think of, even in 
> transfer mode recording several channels and playing back another, the only 
> time there has been even a single blockerror is when a card tunes to a 
> different transponder (see below). 
> I have applied parts of Jaakko's patch, and played a bit with ves1820 
> settings, so I will try to isolate any differences from the official driver 
> that actually make a difference in result (if any of course).
>
> 2 questions though:
> When a card changes to another transponder the other card glitches, i.e. 
> suffers some blockerrors. Only on the exact moment of tuning. It doesn't 
> matter which card is tuned to what transponder, same frequency or not, it 
> just briefly burps. Any ideas? 
Enable frequency bending then the 2 PLLs don't work on the same 
frequency anymore and interferences should disappear. Another reason 
could be a weak power supply.

Holger



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