[linux-dvb] Re: DVB-T and zigzag scans question

["Robert Schlabbach" <robert_s@gmx.net>]

From: "Andrew de Quincey" <adq_dvb@lidskialf.net>
> With DVB-T, the zigzag scanning code chooses a step size as follows:
>
> stepsize = fe->info->frequency_stepsize * 2;
>
> frequency_stepsize for OFDM frontends seems to be set to 166667 usually,
> which means it zigzags using a stepsize of 333334.
>
> Thing is, in my experience, frequency bending doesn't work for DVB-T
> either.  Using a stepsize of 166667 for trying to lock on to a slightly
> displaced signal is way too large, let alone 333334.

Hmm, it makes perfect sense to me. The TDA10045H supposedly can detect a
signal within +/-167kHz, so you'd check this range by querying its
registers, then use the zigzag scan to check the adjacent ranges...

Regards,
--
Robert Schlabbach
e-mail: robert_s@gmx.net
Berlin, Germany



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