Thanks a lot for your advice.
I think I will stick to the 2x2 Mimo.
I don't know if anyone uses Routerboard's as Access Point replacements, i.e. lots of "generic" clients, i.e. android phones, windows laptops etc?
RB's are obviously designed to create bespoke networks, but the only reason I would probably be curious about using 3x3 Mimo is to improve throughput to devices such as these, where signal strength etc can be less controlled and you need all the help you can get.
3x3 mimo to serve 1x1 or 2x2 clients helps little. You only increase the signal a little (1x1AP => 2x2AP gives 3dB extra, 2x2=>3x3 give 1,5dB extra, 1x1=>3x3 gives 4,5dB extra signal.) The connected conn. rates are also depending on the amount of chains and the bandwith compared with the modulations used. It's obvious a legacy 1x1 card will never be able to connect at more then 54Mbps, even in a full 3x3 mimo AP capable of doing 600Mb.
So, only on the perimeters of your AP's signal range 2x2 or 3x3 will give a little bit better signal to a 1x1 device, and can thus sustain a possible hihger data rate.
But if the signal already is good you won't see any improvements.
On the contrary, one legacy device will drop the total mimo AP network to lower data rates so 2x2 devices are no longer served at the higher possible data rates.
(Unless you use some high end stuff that can..)
Show your appreciation of this post by giving me Karma! Thanks.
Rudy R. Puister
WISP operator based on MT routerboard & ROS.