[linux-dvb] Re: tt dvb-c 2.1 and signal quality

[Torbjörn Jansson <torbjorn.jansson@mbox200.swipnet.se>]

>> I have done some more testing.
>> If I start the kernel with the option "no-hlt" I get almost the same
>> improvement as when running a program that just consumes cpu.
>> I get some bit errors but most of the time uncorected errors is zero
>> or very low. 
>> 
> 
> I had the exact same symptoms on my two Siemens DVB-C
> FF-cards (rev 1.5)
> in two different cable networks and three different computers. Cards
> worked usually fine some time, and then ber rose high and picture was
> unwatchable, full cpu usage helped sometimes for a while.
> My cards were fixed with adjusting the AFC-value on ves1820
> module. Just
> give pwm=0xNN and verbose=1 as options to the module, with
> verbose you
> get the AFC-correction values the module does into
> /var/log/messages. On
> my cards the best setting was pwm=0x54 (original value is 0x52), then
> AFC correction varies usually between 0 and -1. My BER values
> dropped a
> lot, and now the cards work error free even if driven
> continuously for a
> week.
> 
> I remember that you wrote about this problem before, but I´m
> not sure if
> you got this advice already (or if this even applicable to your card).

I tried changing the pwm, but from some of the replies I got to my mail I
got the impression the pwm didn't do much good on TT cards.

The AFC is almost always -4

I'll probably give the pwm setting another try.



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