[linux-dvb] Preliminary support of Hauppauge Nova-T 500 Dual (take 2)

Jose Alberto Reguero jareguero at telefonica.net
Wed Sep 20 11:37:50 CEST 2006


El Lunes, 18 de Septiembre de 2006 19:29, Jose Alberto Reguero escribió:
> El Lunes, 18 de Septiembre de 2006 17:59, Patrick Boettcher escribió:
> > On Mon, 18 Sep 2006, Jose Alberto Reguero wrote:
> > > El Domingo, 17 de Septiembre de 2006 22:28, Patrick Boettcher escribió:
> > > > Hi all,
> > > >
> > > > I just updated my .dib0700 repository, it should now work with both
> > > > channels.
> > > >
> > > > I have very good reception with this card at my home (25 dB C/N). If
> > > > anyone encounters problem with reception, please compare the
> > > > perfomance of the card with the Windows driver.
> > > >
> > > > It could be, that the reception of the card is bad when you are very
> > > > close to the transmitter (due to an amplifyer (LNA), which in always
> > > > on now). Please report if this might be the case for you.
> > > >
> > > > good luck and report success or failure,
> > > > Patrick.
> > >
> > > Driver works well with both tuners, with the card ID 2040:9950.
> > >
> > > I have a few reception problems especialy with one frecuency:
> > >
> > > using '/dev/dvb/adapter0/frontend0' and '/dev/dvb/adapter0/demux0'
> > > reading channels from file '/root/.tzap/channels.conf'
> > > tuning to 770000000 Hz
> > > video pid 0x0065, audio pid 0x0067
> > > status 03 | signal aa6d | snr 0000 | ber 001fffff | unc 00000012 |
> > > status 1b | signal aa4e | snr 0000 | ber 001fffff | unc 00000000 |
> > > FE_HAS_LOCK status 1b | signal aab7 | snr 0000 | ber 001fffff | unc
> > > 00000000 | FE_HAS_LOCK status 1b | signal aa98 | snr 0000 | ber
> > > 001fffff
> > >
> > > | unc 00000000 | FE_HAS_LOCK status 1b | signal aa42 | snr 0000 | ber
> > >
> > > 001fffff | unc 00000000 | FE_HAS_LOCK
> > >
> > > I can't compare with windows(I have not Xp). Maybe bad signal.
> >
> > Hmm, can you try to change line 70 in dib0700_core.c to set GPIO0 to 0
> > instead of one and see if it is better on this frequency.
> >
> > regards,
> > Patrick.
>
> I think you mean line 70 in dib0700_devices.c
>
> dib0700_set_gpio(adap->dev, GPIO0, GPIO_OUT, 0); msleep(10); // LNA
>
> It work better for me. I can tune all the channels.
>
> Thanks.
> Jose Alberto
>

I made a experiment, and take the agc params from dib3000p_mt2060_agc_config 
from  dibusb-common.c line 170 and put in bristol_dib3000p_mt2060_agc_config 
from dib0700_devices.c line 26 except ".setup" and I have much beter results. 
I can tune to this frquency with LNA off and with LNA on with good results 
(similar ber, a little better with LNA on).

I atch the patch.

Thanks.
Jose Alberto
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