[linux-dvb] Re: Spectral Inversion (was Re: Re: patch for scan(-t bitfield select))

[Holger Waechtler <holger@convergence.de>]

Holger Waechtler wrote:
> Robert Schlabbach wrote:
>
> > From: "Johannes Stezenbach" <js@convergence.de>
> >
> > > But AFAIK there are no DVB-T FE around which have inversion ON,
> > > so I changed it there from AUTO to OFF.
> >
> >
> > Don't cable and terrestrial tuners _always_ spectrally invert the signal,
> > so that the demodulator must have spectral inversion enabled by default?
> > The VES1820 on my Siemens-Cable card had to have spectral inversion
> > enabled, and so does the TDA10045H on my TT-Budget DVB-T card.
>
> no, e.g. the L64781 and the tda10021 report no inversion. Some revisions 
> of the TT DVB-C card too. The reason for the inversion is probably that 
> the hardware designer swapped the I/Q wires between tuner and demodulator.
a remark: some providers transmit with spectral inversion, maybe just 
because they swapped the I/Q plugs in their modulator or RF amplifier.

Holger



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