[linux-dvb] Re: Low bitrate transponders with TT Budget (NOVA) DVB-S card

[Radovan Garabik <garabik@melkor.dnp.fmph.uniba.sk>]

On Wed, Jan 07, 2004 at 02:09:59PM +0200, Irek Defée wrote:
> I can not get, or get a lot of packet loss, from low bit rate 
> channels using TT Budget card, e.g.  from Hot Bird TRT 10957H, Arte 
> 11060V or Polsat 11413H transponders. I am using drivers 1.0.0-
> pre3 
>  
> These transponders are received perfectly with Windows drivers for
> this card. 
>  
> I wonder where is the problem: on the drivers side, or channel 
> search function? 
>  
> Has anybody tried those transponders and what were results?
>  

I tried (with SS2 card), and found out that:
1) these transponders seem to be rather weak. Both windows and linux
drivers have often problems locking (bad weather etc...) while other
transponders are good
2) with SS2, precision of tuning frequency inversely depends on
bitrate. So for transponders with low bitrate, frequency must be tuned
precisely. This is important, since your LNB can drift somewhat
depending on temperature/age/etc... and precision of szap is 1Mhz. 
IMHO kernel driver (or szap?) has some autotune capabilities, at least 
on some other (almost empty) satellites, if I use frequency off by 1MHz,
locking takes somewhat longer but it lockes eventually, but on full
satellites (such as HB), card seems to lock on neighbour transponders,
and since they have different bitrate, you see nothing as a result (I
witnessed it when I set wrong polarization by mistake - after few
seconds, szap locked, probably on neighbour transponder, but there was no 
output from the dvr device - it took me some time to find out :-)).

But with carefully aligned dish, I can lock and watch those channel
without problems


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| Radovan Garabík http://melkor.dnp.fmph.uniba.sk/~garabik/ |
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