[linux-dvb] Re: Question about inversion and DVB-S

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

On Tuesday 02 March 2004 14:25, Johannes Stezenbach wrote:
> Andrew de Quincey wrote:
> > The frontend on mine can get a lock at 27500, but I'd noticed when I read
> > the values back from the hardware that it had actually detected 27504..
>
> Sounds like the broadcaster has a problem.
>
> > Another thing is that 11747000 is _really_ close to the lnb switch
> > frequency of 11700000.. could that have something to do with it I wonder?
>
> The switch frequency is chosen somewhat arbitrarily. Does it work better
> if you change your switch freq to 11750000?

Yeah, I've already tested that: I can lock on, but the VERROR rate is 65550 
ish. Whereas, the VERROR with the frequency inversion on is 0 always.

> > Is there any actual point in being able to specify the inversion then? It
> > sounds like we should always be using INVERSION_AUTO to ensure we don't
> > get these problems.
>
> IMHO the intention was that the application finds out the actual inversion
> during scan, so that later it can specify the correct inversion to speed
> up tuning.

Ah right. Hmm, thats not how it is being used in the apps I checked.


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