xr9 on RB133 problems, help

at first everything works fine, Max throughput go over 40mbps, I was very happy about that. but after few hours test , something bad happened, the singal strenght suddenly go up to -5 to -11 dbm, which it should be less than -45dbm, 32 byte ping results about 50ms and 10% package loss, throughput go down to 1mbps. what happend? it’s rb133’s problem or xr9’s? but they are brand new stuff, I just brought them home..

Here is what I have done to set up both side:
point A(xr9+rb133 ros v3.30): ap bridge + wds, ssid:test ,feq:2437mhz , 2.4G B/G mode, tx power set to card rates 28dbm, bridge eth1 ,wlan1 and wds. Antenna port set to antenna a (card j8).ip:192.168.2.2/24

point B(xr9+rb133 ros v3.30): bridge +wds,ssid:test, feq:2437mhz , 2.4G B/G mode, tx power set to card rates 28dbm, bridge eth1 ,wlan1 and wds. Antenna port set to antenna a (card j8).ip:192.168.2.3/24

please help… Any helpful idea will be greatly appreciated. thx..

Your signal is from -5 to -11?! Reduce tx power man! And you’ll get good results. Good signal is from -50 to -70..