Senao 2611CB3 PLUS (Deluxe) issue - not working properly

Hi all,

I have a Senao 2611CB3 AP, and I do not succeed making him work properly. If I setup the AP on channels 4 - 14, I can not detect it on my Trendnet TEW-610PC wireless pcmcia network card (I also tryed with another acer laptop - no success). Only when setting the AP on channel 1 or 2 I detect it on my laptop. After connecting, although there is no traffic load, I get 1 ping request time out from 8 - which is weird. Its signal strength (as seen by the laptop) is lower than a Trendnet TEW-610APB access point, although Senao has 23dBm output RF power compared to the trendet which has 18dBm.

Does anyone encountered any issues on this senao AP ?
Thanks