[linux-dvb] Re: Nova-T - terrible BER with pre3, good with pre2

[Holger Waechtler <holger@convergence.de>]

Dave wrote:
> Hi There,
>
> I'm not a developer, so I'm afraid I can't offer any solutions, but I
> thought I'd report this so that someone can look into it, and so others
> finding the same problem know about it.
>
> I've just moved my Nova-T from an old computer (which only used a
> set-top aerial) to a new one (which has a feed of a roof-top aerial). 
> Card instantly became unusable, with Bit Error Rates of the order of
> 0x2000, rather than the order of 0x00a0 I was getting before (on the
> main BBC Mux in both cases).  I checked everything, different aerial
> feeds, the possibiliy of other TV cards IF interferring, heat, noise
> from the faster CPU, noisey PSU rails, all getting me nowhere. 
> Finally, I thought of the driver version.  In the new machine, I'm
> using linuxtv-dvb-1.0.0pre3, in the old machine I had been using pre2. 
> I downgraded the new machine to pre2, and bingo, BER's back down to
> approx 0x00a0, no unconceiled errors, and a rock-solid picture.
>
> Sorry I can't be helpful and dive into the code to find the reason for
> the poor performance, but I hope this info proves useful for someone.
please report at least which frontend is soldered onto your card. 
Thenafter you might try to check out different versions of the matching 
driver from CVS and report the date when exactly the driver became broken.

Holger



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