saa7134 PCI card (CTX917): FM radio not working

Hi, I got a Creatix CTX917 (there seem to exist multiple versions of this card, mine got for example on the outside 2 video in (one cinch and one S-Video), a line in jack and 2 RF connectors, one for TV/DVB-T and one for the Radio atenna, on the inside there are 3 of these "4 pin CD to soundcard" like connectors, one in white, one in red and one in yellow).

After I got DVB-T and normal TV to work, I wanted to be able to use the built-in FM radio, too. The radio tuner seems to be detected, as /dev/radio, /dev/radio1 and /dev/v4l/radio1 are created, but the "radio" tool isn't working, neither as user nor as root. It tunes, but there simply is not sound, and there are no radio signals detected if I use the "auto" mode of gqradio, either.

My distro is Archlinux 64bit with all the latest updates, including those from testing and unstable repositories, so my kernel version is 2.6.26.5. I'm using the stock kernel from the official Archlinux repos (package "kernel26", release "2.6.26.5-1").

I recently got a Hauppauge Nova-T (one of the first ones, with the old brown PCB and Philips chips), which is working flawlessly (my only problem is that I haven't found a way yet to select the DVB-T card I want to use in Kaffeine or any of the other DVB apps I've tried. Perhaps somebody could give me a hint?)

Here is some more info:
-----[lspci]--------------------
02:0a.0 Multimedia controller: Philips Semiconductors SAA7134/SAA7135HL Video Broadcast Decoder (rev 01)
Subsystem: Creatix Polymedia GmbH Medion 7134
Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr-
Stepping- SERR- FastB2B- DisINTx-
Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort-
<TAbort- <MAbort- >SERR- <PERR- INTx-
Latency: 84 (21000ns min, 8000ns max)
Interrupt: pin A routed to IRQ 18
Region 0: Memory at efefe000 (32-bit, non-prefetchable) [size=1K]
Capabilities: [40] Power Management version 1
Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=0mA
PME(D0-,D1-,D2-,D3hot-,D3cold-)
Status: D0 PME-Enable- DSel=0 DScale=1 PME-
Kernel driver in use: saa7134
Kernel modules: saa7134
--------------------[/lspci]-----

Besides my problem with the CTX917, I'd have a more general question: (how) would it be possible to use the tuner of a TV card (analogue TV or DVB-T) as some kind of "universal receiver" for a software defined reciever? For me as a ham radio operator, a receiver being able to digitalize radio signals from such a broad spectrum as 800Mhz would be very interesting, especially considering that a "real" receiver (even just a handheld) would cost 5 times more than a cheap TV card for my computer. Of course, the ability to digitalize the "raw" signal from the air without any demodulation would be another great advantage over a traditional receiever (although I'd also be more than happy if I was just able to demodulate FM signals on this broad spectrum).

Thanks a lot in adavance guys, you're doing a great job here! :) Pascal

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