[linux-dvb] Re: [PATCH] QT1010 - 125kHz step and fixes

Aapo Tahkola aet at rasterburn.org
Thu Nov 30 21:22:01 CET 2006

On Wed, 29 Nov 2006 04:18:48 +0200
Antti Palosaari <crope at iki.fi> wrote:

> Hi,
> changes:
> - 125kHz step, register 0x1a
> - tuner offset and fix register 0x07 calculation
> - added some alternative values to registers 0x11, 0x1f and 0x20.
> Values are hidden behind preprocessor macros, old values are used by
> default.
> I don't know what is the real stepping supported by HW, probably it
> is less than 125kHz. 125kHz were used in both of the Sigmatek DVB-110
> and MSI Megasky GL681 Windows drivers. Though, I guess, 125kHz is
> enough for tuning all frequencies in DVB-T bands supported by hw
> (48-860MHz). In my understanding it should be possible now to tune
> all DVB-T channels used worldwide, in theory at least. Locking is
> harder to get, because most of the register values are still only
> magic numbers, for example setting bandwidth is unknown. Frequency is
> set by: 0x07 (n*32MHz) + 0x0a (n*4MHz) + 0x1a (n*125kHz).
> Patch should not change functionality of the other than frequency 
> registers, eg. if your Megasky works before this patch, it should
> work also after. If not, there is a bug.
> Patch tested with Megasky GL681 and Sigmatek DVB-110 against fi-Oulu 
> frequencies. Megasky works always and Sigmatek as poor as without
> patch :) If I change defines to SIGMATEK, Sigmatek works better and
> also Megasky seems to work as expected. I still left old
> functionality to default, because Sigmatek stick is not so popular as
> Megasky. Please test different configurations and report.
> If someone owns devices with QT1010 tuner, other than mentioned this 
> mail, and can do USB-sniffing in windows, please help. I will give 
> detailed information by email.
> Aapo, could you test this patch with your hardware.

fi-Rovaniemi channels look ok. I'll test fi-Ruka later.

Aapo Tahkola

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