In one of my sites I have a 532a system running 2.9 an access point with R52 mini pc radio card and omni antena (10.5 dBi). AP serving area proximitly 1.5 km in diametar. All user are inside of 1 km diametar, and I have curently 3 users on that AP. Signal level on this user was around 55-60. On that site I also have bridge and sectorial antena.
Untill 15 day ago signal level on both AP and MT SU was exellent and sudenly droped for 20 dB so at this moment signal level on every user is around 77-90, which is uneceptable (VoIP). I found nothing in logs either on AP or SU unit. Signal level on bridge and sectorial antenna (also MT R532a with R52) was unchanged and they work just fine without signal level drop or any other problems
I check for interference but I didn't find anything, change omni antenna, RF cables, UTP cables with connectors and finaly I change whole routerboard but nothing help. Signal level is still 20 dB down.
If anybody can help me with this it will be appreciated. I really don't know what to do further.