[linux-dvb] Re: Budget SU1278 (STV0299/TSA50059) DVB-S corruption on SOME channels

[Andrew de Quincey <adq_dvb@lidskialf.net>]

On Friday 24 October 2003 03:00, Andrew de Quincey wrote:
> > BTW: I also found an issue with low symbol rates: The STV0299B datasheet
> > says that the gain CFD[6:4] MUST NOT exceed the coefficient e[3:0], as
> > that may lead to instability. But when you take the recommended STV0299B
> > settings from the SU1278 datasheet, that is the case for symbol rates <5
> > MBaud. Since I do not receive any transponders with such a low symbol
> > rate, I have not been able to verify if there is indeed a problem...
>
> There definitely is a problem. Lots of transponders on hotbird have weirdy
> symbol rates. None of the ones about 5MBaud and below work with my patch.

Actually, I've just noticed the above was with a different tuner... "BSRU6, 
TDQB-S00x". Although it is STV0299B based, it doesn't seem to be able to deal 
with symbol rates below 10MBaud. Is this expected? (I've tested with the 
normal driver, and it has the same problem BTW)

> Hmm, actually I've just noticed a channel at 22MBaud ain't working either.
> Now THAT is probably my problem.

It was; I fixed the bug. However some channels still don't tune correctly for 
some reason... I have an awful  suspicion this is the change to a 1MHz 
stepsize :( 

Robert, if you're able to get an Astra2 feed, are you able to lock on to the 
channel at 118365 ? Using my modified driver, I am unable to get a lock at 
all at that frequency (the standard one is fine though).

I've not tried the modified driver at symbol rates < 22MBaud; I need someone 
to physically swap the cables over. gah!



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