Last week, at inet-meeting Cyberbajt presented his new Mimo 3x3 products.
Pretty impressive results, I think. With new Atheros AR93x0 chipsets, MikroTik becomes fastest WiFi solution, in this price segment.
Nice alternative for high throughput p2p links. 
Does anyone had any experience with such equipment?
Do you have any more info on this. Looks very interesting.
What was the link distance, signal levels, ccq, antennas used, etc.?
Hi everyone
Above test was made with Cyberbajt 19dB Mimo 3x3 antenas at 500m link. Signals about -60 for all 3 chains. CCQ about 90%
Today we move this link to 4km, but signals are to low. Max transfer is 60Mb with signals about -77. Maybe if we change cards for more powerfull models, link will get better.
Iāll write here more information tommorow.
youād better to change antennas!
what model type of card you use ? manufacturer, cardā¦ iĀ“ve done some tests with UBNT SR71, but without better results than 2x2
SR71 is only 2 chain chipset card. Check AR9160 specification.
My cards are AR9380 from Sparklan. Itās new generation chip, with 3-chain support
Antennas are quite good, but only 19dB. Everythings works fine for shorts distances. Now Iām looking for high gain dish antennas with 3x3 support. I think itās to new technology, because I canāt find anything more than 2x2.
I have a few problems with MT software and AR9390 chipset support:
Next problem is with tx-power. When i change power values, I see no changes in āCurrent TX Powerā tab.
currently there is a limitation for the tx-power and the only way how to change the power is by using tx-power-mode=all-rates-fixed. Please be careful and not to use higher tx-power than the highest data-rate has as that might damage the card. Use this setting if you want to do some in lab testing where you need low tx-power values.
For better MCS selection, use the rate-selection=advanced
Thx for reply
All-rate-fixed works as You says. MCS selection in āadvencedā works really faster.
Hi all
After few tests - I can write some conclusion. Cards are awsome 
With good antennas can work with more than 200Mb real network throughput. In bad envoironment, where much noise is, cards work better than old MIMO 2x2. They can work with QAM16 modulation with higher MCS.
Imho if used for distant links you can use 3 independent antennaās, just put them close together on the tower and make sure the physical distance of the path from the radio connector to the antenna is exactly the same (use same coax cable lengths and same pigtails)
For remote unit it looks like one big 3 chain antenna.
I even remember to have red somewhere that 3 slightly separated antennaās might even perform better than all in one unit. Special since at least two of the three have to work on same polarization.
I havenāt find any docs so far that actually decides on best practise on polarization setup for 2x2 or 3x3 (2x3 or even 3x4 seems to be a completely unexploited area yet, apart maybe from some proprietary solution like Ruckus uses?)
So I presume you have to play to find best results. And these are than not conclusive since the environment also has a roleā¦
Hi, thanks for advise. I will try it.
Iāve just tested new antennas, and I see big improvements. New project is also 19dB, but diferent design. Test link at 850m can work with 150/30Mb (43k pps/12kpps) real network troughput. (TX-Power is set for 3 for both sides, NV2 is enabled, signals about -55) Ping is about 3..4 ms. I think MT software need some improvements, because link default sets to MIMO 2x2 MCS, and I have to manualy set only 3 chains MCS. There is a problem with QAM64 MCS for 3 chainās, and now I donāt know is it problem with software or with antennasā¦ Maybe new nv2 package will work better, but I canāt try it, because MT developers didnāt respond for my mail.
On the same link I have NB22 and max througput in test is only about 60/20Mb (with terrible pings). I try to check Rocket on 3x3 antennas, Iām curious how it can work in the same environment.
I found a formula somewhere that discusses recommended distances for antenna in MIMO systems, canāt remember or find it again.
I am seriously considering replacing a 433 w/3 R52Hās running 3 sectors with one of these and see how it works.
Almost all of my customers can connect to at least two sectors, might just take care of a lot of problems I have there.
Looks to my you are a bit confused hereā¦
You can not replace a 3 sector AP with 3 radioās/SSIDās by one 3 chain 802.11n unit unless you suddenly want to start using a omni antenna (which will degrease signal levels some 30% on all unitsā¦ depending on type etc.)
Or you want to replace the 3 present sector/R52H setup by one 3 chain mimo card working in 802.11a mode and connect each of the chains to one of the sector antennaās.
I think this is what you think off, but it is not mimo. (802.11n) It us just plain 802.11 with 3 fully synchronised sector antennas working in same frequency and with same SSID.
I already do it with 2 2 chain units and recently received a 3 chain card (ubnt) for testing purposesā¦ if it works youāll read about it..
Canāt remember the guyās name on here, smart fellow tho, he did a PTP link with an 802.11n card in the middle, one chain facing N, one chain facing S, worked fine for him.
I know beam forming would not work with sectors, but I need to redo that AP anyway and I want to try this. Considering every client on the AP can hit at least two sectors, it seems that the signal reconstruction of 802.11n would come into play.
I am not looking for 450Mbps bandwidth, just thinking of a decent test that might pay off before I have to completely change up a towerās configuration. Single chain performance would be enough for this AP for the foreseeable future.
edit: for clarity, yes, just 3 sectors synchronized on a single 3x3 card.
This could work. You can set HT-chains for 3x3 on AP and on Clients side set only 3x1, 2x1 or simply 1x1 chain. I try to test this if only I find some free time.
Interesting will be possible 3x3 Mimo antennas with gain for about 26-34dbi. Becouse 16dbi max 2-3km
Itās only matter of time, when such antennas will be in wifi shops.