[linux-dvb] TT C-1200 USB wrong frequency

Suur Karu suurkaru at fastmail.fm
Tue Nov 21 11:51:33 CET 2006


Thomas Kaiser wrote:
> Suur Karu wrote:
> > My Technotrend Connect C-1200 USB DVB-C adapter have problem
> > to tunning to 170MHz (no signal at all), but instead of it I found 
> missing channels on frequency 178MHz (not listed in NIT table), but 
> with big disturbance in picture and not stable LOCK (not usable).
> >
> > dmesg:
> > ttusb_init_controller: unknown STC version V 2.5, please report!
> > ttusb_init_controller: dsp-version: 0.0
> > DVB: registering new adapter (Technotrend/Hauppauge Nova-USB).
> > DVB: registering frontend 1 (ST STV0297 DVB-C)...
> > usbcore: registered new driver ttusb
>
> If your device is using the philips tda1316 tuner, i think there is a 
> problem in setting the correct Band. 162 MHz and above should be band 
> 2 (Mid-Band). But in dvbc_philips_tdm1316l_tuner_set_params band 1 is 
> set for frequencies below 200 MHz:
>     // determine charge pump
>     tuner_frequency = params->frequency;
>     if      (tuner_frequency <  87000000) {return -EINVAL;}
>     else if (tuner_frequency < 130000000) {cp = 3; band = 1;}
>     else if (tuner_frequency < 160000000) {cp = 5; band = 1;}
>     else if (tuner_frequency < 200000000) {cp = 6; band = 1;} <<==
>     else if (tuner_frequency < 290000000) {cp = 3; band = 2;}
>     else if (tuner_frequency < 420000000) {cp = 5; band = 2;}
>     else if (tuner_frequency < 480000000) {cp = 6; band = 2;}
>     else if (tuner_frequency < 620000000) {cp = 3; band = 4;}
>     else if (tuner_frequency < 830000000) {cp = 5; band = 4;}
>     else if (tuner_frequency < 895000000) {cp = 7; band = 4;}
>     else {return -EINVAL;}
>
> Try to change to 2:
>     else if (tuner_frequency < 200000000) {cp = 6; band = 2;}
>
>

Yes! This fixed tuning problem. Thank You!

Regards,
SK





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