adaptive-noise-immunity (yes | no; default: yes) - adjust various receiver parameters dynamically to minimize interference and noise effect on the signal quality. Only AR6001XL and AR6001GL and newer Atheros chips support this feature.

that's what the manual says...

but what does exactly that parameter does? options are not YES & NO
options are:
1) AP and Client mode
2) Client mode
3) None

when should i use option 1, 2 or 3???

There is some discussion on it here:

http://forum.mikrotik.com/viewtopic.php ... tive+noise

-eric

zenkiu