Thx for reading and applying.
I’m not very clear, and the MT documentation by moments is very confusing
@bpwl
So you’re saying that;
1- These devices are powerful devices. So lower the antenna gain;
interface/wireless/set wlan1 antenna-gain=8
No one can lower the physical antenna gain with just a parameter. The “Antenna Gain” parameter in RouterOS is the value used in the EIRP emission calculation and limit. The sum of TXPower of the radio + that "Antenna gain " parameter must be (is) equal or lower than the EIRP level allowed in your country. The higher the antenna gain power parameter is set, the more the TXpower will be reduced.
Avoiding interference with just reducing the TXpower further almost never works. The channel is busy whenever even the faintest signal is detected. See: http://forum.mikrotik.com/t/hap-ax3-wireless-problem/172468/1 For an Omnitik 5 I assume the ether is busy around it up to 250 meter, around any Omnitik 5 when transmitting. AP or station makes no difference.
2- Use the right channels. For NV2 to work correctly;
Only the AP defines the used frequency. The stations (eg mode= “station bridge”) just follow the frequency set by the AP.
As far as I understand your setup, you have only 2 AP (mode= AP bridge"), all the rest is station.
So you need 2 channel selections that do not overlap, these are to be set in the AP’s. There is normally enough room in “wifi band 5 outdoor” for 2 or more selections with 20/Ce (=40) MHz bandwidth.
The stations don’t count in this, they will use the AP’s frequency, and only transmit in the time-slots assigned by their nv2 AP.
For mode 802.11, AP and stations have to check if the channel is free, count some random time-ticks and then check again. They transmit if the channel after the time-ticks is free.
Mikrotik WLAN drivers with their very limited transmission blocks, wait for 60% of the time, to transmit 30% of the time, when at 80MHz, 866Mbps interface rate.
NV2 assigns timeslot without waiting, only leaving an empty time-slot to allow an extra station to sign in the nv2 group.
But 5660/Ceee and 5680/eCee and 5700/eeCe and 5720/eeeC use the same 80MHz chunk. (Frequency is that of the C channel, the e’s around are also used).
Nicely documented in your table: the 80MHz A B C D are the same frequencies
So you have 3 yellow blocks for outdoor.
And avoid the one with the red lines if you can. (Called CAC 10 minutes, weather radar channels, Channel Availability Check - CAC takes a full 10 minutes, before the AP can be activated)
So this leaves 2 preferred blocks of 80MHz, or 4 blocks with 40MHz, the onces I use (in Europe, USA has better signal in the high blue block)
Mikrotik WLAN driver uses the 20MHz frequency of the C channel to specify the channel, not the 40,80,160 channel numbers or freq in grey in your table.