[linux-dvb] Re: DST & Twinhan-Card

[Craig Read <craigread@csi.com>]

Stefan Schenk wrote:

> This might be also of interest for the list
>
> I was playing around with the values Jamie was talking about ...
> without success.
> There must be some other differences between DVB-T in Australia and
> Germany ....
>
> Stefan
>
> -----Ursprüngliche Nachricht-----
> Von: Jamie Honan [mailto:jhonan@optushome.com.au] 
> Gesendet: Sonntag, 14. November 2004 23:38
> An: Stefan Schenk
> Betreff: Re: DST & Twinhan-Card
>
>
> On Sun, Nov 14, 2004 at 12:14:37PM +0100, Stefan Schenk wrote:
>  
> > Hello Jamie,
> >
> >
> >   as i saw on the dvb-mailing-list you did a lot of great work, 
> > making the Twinhan-cards working under linux. I have a very strange 
> > problem here. I use a DVB-T card from the german company HAMA which is
> >    
> > said to be a 100% clone of Twinhans VisionDTV. I can load the drivers 
> > and everything looks perfect. The problem is, that i get a very bad 
> > signal in (vdr's femon-plugin shows someting between 15% and 30%) and 
> > therefore the picture is very very bad.
> > When i start the card with the same antenna in the same room under
> > windows i get a full signal and a perfect picture.
> >
> > Do you have any idee whats wrong with my system or my card ?
> >
> > Thanks a lot
> >    
I have exactly the same problem on my Twinhan VisionDTV here in 
Australia.  The MythTV setup program reports ~23% signal strength, I get 
2/5 channels ok (ABC and SBS), but everything else is totally 
unwatchable.  The same card works reasonably under Windoze (>80% signal 
strength, HDTV is unwatchable and channel 10 gets a glitch every minute 
or so).  This is running under Knoppmyth with the 2.4 kernel.  I also 
have a Teac STB which works well on all channels (but not enough singnal 
for HDTV).  I'm about to try loading Suse 9.1 on a fresh drive with 2.4 
kernel and a fresh CVS checkout of the dvb drivers.  If that doesn't 
work, I'll sell the Twinhan card on ebay and buy a DVico FusionHDTV 
(unless somebody suggests a better DVB-T card).

> Hmm. Everything looks good as far as module loading goes.
>
> I guess there's a lot more undocumented registers etc.
>
> One thing you could try, the guy who got it going was in Australia,
> which has 7Mhz bandwidth. You are either 8 or 6. Most apps try
> BANDWIDTH_AUTO, which I notice sets 7 MHz.
>
> You could try playing round with this in the code.
> I haven't a copy of the latest versions but look for code
> like this:
>
>                case BANDWIDTH_6_MHZ:
>                        val[6] = 6;
>                        break;
>
>
>                case BANDWIDTH_7_MHZ:
>                case BANDWIDTH_AUTO:
>                        val[6] = 7;
>                        break;
>
>
>                case BANDWIDTH_8_MHZ:
>                        val[6] = 8;
>                        break;
>
> and try moving BANDWIDTH_AUTO to 8Mhz.
> (actually I see two spots)
>
> You might also try 0 for Auto and see what happens.
>
> Let me or the list know.
> Jamie
>