Do check the seating of the card.
You should be looking for the phrase DVB in the system log or dmesg.
If everything is loaded correctly, then you should see something under /dev/dvb/
If you are wanting to use this card for analog, then you are barking
up the wrong tree as the analog side is not supported as far as I can
remember. The analog side is just a frame grabber with no encoding
capabilities. With other, better options for analog, the support was
never developed in linux.