He`s talking about the DWL-G510 atheros based PCI card, wich comes whit a B1 revision.
I didn't saw that because I just gouge my eyes out with a screwdriver.
Mikrotik 2.9.6 detects its fine, the problem happens when you put another one ( Both`s cards generate a lot of noise. You can see this when you make a survey from about 300 mts, whit a free visual line ).
That's why I recomended the slightly more expensive card DWL-G520.
Boths cards are working in diferent channels, and both are working in AP mode.