[linux-dvb] Re: VES1820 and BSRV2 issues

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

On Wednesday 16 October 2002 19:14, you wrote:
> Hi everybody,
>
> I appied some changes which make the open issues about old BSRV2
> revisions and the strange modulation dependent offsets in DVB-C more
> robust, the zigzag scan catches now catches after some trials the right
> frequencies.
>
> For those of you who want to go on debugging the VES1820 code (and that
> would be pretty good since it could speed up tuning noticable) you might
> want to enable the printk() in dvb_frontend.c, line 332,
> dvb_frontend_set_parameters() to show the actual frequency offset.
>
> a side note: maybe it's better not to play with the reference AGC value
> but the AGC timing constants...
>
> - Holger

Tried again the latest CVS head last night, it will tune to QAM64 after a few 
tries (not stably though), but not to QAM128, although I think it is a 
different kind of problem than the ves1820 register values.

REL-0-9-2 tunes very fast and never fails, but with 2 cards in one PC I get 
occasional artifacts and glitches (never does that with 1 card), and only on 
one of the 2 cards. I even got a cable signal amplifier because I figured 2 
splitters could cause problems. It helped a lot (without amplifier the 
glitches were much worse) but it's not perfect yet.

Doesn't QAM128 allow denser packing of DVB data in a frequency, making it also 
more sensitive? (i.e. needs a better signal)

Somehow I feel the new firmware with the HEAD drivers would be more solid, if 
only I could get them to tune :-) 

Cheers,
Dennis



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