couldn't play with dvb://

Hello,

I was waiting for Mandrake 10 because the Kernel 2.6 should 
support my SAA7146 (Technotrend DVB-S).

After applying firmware I got from "mplayer dvb://1":

get_tuner_type(card 0), ERROR IN OPENING FRONTEND DEVICE
/dev/dvb/adapter0/frontend0: ERRNO 2

So what have I forgotten? Do I something wrong?

At the german Manpage I found:
"mplayer tv:// on:driver=v4l:width=640:height=480:outfmt=i420 -vc
rawi420 -vo xv"

Which answers: 

Cache fill:  0,00% (0 bytes)    TV detected! ;-)
Selected driver: dummy
 name: NULL-TV
 author: alex
Selected input hasn't got a tuner!

How could I got a Frontend or a tuner?

Regards

Falko