Perhaps you might give 'Craig's ACX100 How to' (http://www.houseofcraig.net/acx100_howto.php) a try.

Although I use the DWL-520+, it might give you some hints on how to do it on the 520.

I've got my wireless network working with Fedora Core1 running on a desktop (with the 520+) and a Dell Latitude laptop (Fedora Core1 with DWL650+).

Good luck.