In my case I got a DVBSky ReceiverCard DVBSKY S960C Usb Box.
This card is already recognized by the linux kernel.
As it was also recognized by tvheadend, I though everything went fine , but the card won’t give me a valid TV signal.
So I downloaded the driver from
copied them to
/lib/firmware/* (all of the files)
restarted the machine. And … it works!!!
For my other usb Sat Receiver I got the necessary infos from
Its basically only the same firmware copy action as it was with the dvbsky receiver.
all worked with tvheadend now!