Well among many problems with Atheros cards here is another one!
For 1 year we used a soekris board and MT 2.9.6 as AP Bridge with cm9 (a standard) and Prism 2.5 200mW (b standard) on a client side.
We had to upgrade for a faster cpu and since there is no pcmci slots in new board we purhased 200mw mini pci atheros b/g card.
Now I can't ping some clients with packets more than 256k even if signal is around -60 and client devices are connected in highest rate. And in G standard nothing works. I tried all advised settings for atheros cards and diferent freq.
ack is around 30 and sometimes goes to 380. Links are between 500m and 3km.
When 200mW Atheros card is switched with 100mW Prism 2.5 card signal for the same clients is -70 to -80 but 1024 bytes ping are 10ms with 5% loss max.
I urgently need some ideas.