I've just purchased a D-Link DWA-643 Xtreme N ExpressCard Notebook Adapter - but it can't connect to my wireless network

The card is listed on the FSF website and - refer links below:

• http://www.fsf.org/resources/hw/index_html/net/wireless/index_html/cards.html
• http://www.dlink.com.au/products/?pid=550

Ubuntu see the card as using the Atheros AR5008 chipset - refer image below

The card lights up and I can see that available wifi networks using this card - so it seems to 'just work' on ubuntu 12.04 but when i try and connect to my networks - it fails

• I've tried setting the network to all the different options (WEP, WPA2, no encryption, etc.. b/g/n ) but ubuntu sill cant connect to it
• I've also installed wicd but still couldn't connect

Has anyone got a DWA-643 to work in Ubuntu? Or does anyone have any suggestion on how to get it to connect??

Any help would be greatly appreciated

Note:

• the laptop has built in wifi but its broadcom, works but with dialup speed connection - and i've had nothign but trouble using the boardcom drivers so purchased the FSF recommended PCI expresscard as i hoped it would 'just work' on the latest Ubuntu
• i've have tried to disable the built in wifi - broadcom - but even with the broadcom uninstall and unavailable it didnt help the dlink to connect
• previously I had MAC address filtering on the router - i've added the dlinks MAC - and also disabled MAC address filtering - still no luck

lspci output below:

18:00.0 Network controller: Atheros Communications Inc. AR5008 Wireless Network Adapter (rev 01)
Subsystem: D-Link System Inc Device 3a6f
Flags: bus master, fast devsel, latency 0, IRQ 18
Memory at e4000000 (64-bit, non-prefetchable) [size=64K]
Capabilities: [40] Power Management version 2
Capabilities: [50] MSI: Enable- Count=1/1 Maskable- 64bit-
Capabilities: [60] Express Legacy Endpoint, MSI 00
Capabilities: [90] MSI-X: Enable- Count=1 Masked-
Capabilities: [100] Advanced Error Reporting
Capabilities: [140] Virtual Channel
Kernel driver in use: ath9k
Kernel modules: ath9k