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

[Dennis Noordsij <dennis.noordsij@wiral.com>]

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? 

What works well to split the antenna signal? I need to split it first to have 
one lead go to the normal VCR, and one to the VDR, but at the VDR I need to 
split it again because of 2 DVB cards (tuners do not have a signal out like 
for example the Hauppauge). Anything in particular to look for? Or do the 
run-of-the-mill €2 small splitters suffice?

Cheers!
Dennis


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