Hello.
Still is there problem that causes disconnects on links with NV2 !!
A lot of solved with MK support.
Links have good signal (-50 - 60), good CCQ but still disconnect, not responding. Problem persist in all version 5.x (also in 5.14 and 5.15RC1)
Routerboot is the last.
It happens on 200meters links (with a sextant), but also on the 9 km links with high-quality parabolic antenas.
This is reflected in the single 802.11N but also in the N 2x2. If on the same link is NV2 disabled, there is NO problem with disconnect.
I solved all my NV2 AP disconnects by improving each AP antenna enclosure shielding from each other this has reduced the signal pickup from the other AP’s and stopped NV2 disconnects, http://forum.mikrotik.com/t/radio-card-rx-bandwidth/45267/1
Never had NV2 disconnects with grids but I moved them as far apart from the AP’s on the mast,
When you scan from each antenna what is the pickup signal level from this scan of other nearby units,
This NV2 link works on channel 5680. There is NO network on same chanel. See scan…
But this problem is on many links. I do not know what to improve?
We dont use grids! We use only parabolic antenas with metal shielding enclosure. http://nanoboot5.cz/reflektor_5ghz_23db/062.jpg
Hi, I have the same problem. NV2 is constantly disconnects. I also use shielded boxes and quality dish.
There I discovered another problem with the NV2, link is attached, but do not pass any data.
AP Bridge (bridge= eth1 + wlan) ----- station (static routing) - link is active, but occasionally pass through any data. It helps to reboot the AP.
RouterOS 5.14.
P.S. When the switch connection to Nstreme both problems disappear. But again Nstreme understand the power of N-cards.
At this point if this was happening to me, I would either purchase or if possible hire a spectrum analyser to scan 5Ghz band frequencies ( get 1 that will scan up to 8Ghz or above),remember MT scan show 802.1 compliant transmissions and not all of other users who can and do use this unlicensed band will show up on this type of scan,
Is your network bridged or routed, i am using routed.
Do you use “any” wireless protocol on the client side, I had issues with this (but they were not disconnects) and were solved by using “NV2 Nstream 802.11”
As sometimes with an issue like this a process of elimination could be used,I assume you have tried different frequencies
(had a backup wireless Vlan disconnecting at -88 but moved freq by 40Mhz and now no disconnects signal varing between -84 to -90) another parabolic antenna, radio card, pigtail, cat5 cable different POE and power supply,
Power supply have you checked how clean the AC voltage is at your location does it have high voltage spikes or “hash” on the AC waveform
It could support Mikrotik express your opinion?
According to the responses I am not alone who has these problems. Support@mikrotik.com does not respond to emails.
Could be … Honestly I’m not an expert.
In some sites, I fixed it moving to other frequencies were also 100% free, but in others the problem persists without apparent reason.
I see that the problem is bigger when are 2 antennas very close, although they are in different channels, any advice?
Thanks
Dear MT team.
How do we report this problem? Via email no answer from support.
I have generated supout.rif after disconnect with 5.15rc1(12.April) and still disconnect.
Thanks
In my opinion you are all wasting your time trying to find a fix - we have done extensive field testing and have found the ONLY successful NV2 installations are way out in the country where there is NO other RF - we have concluded that NV2 is extremely susceptible to even the slightest of interference. Having said that we gave up testing at ROS 5.8 so it is possible they have improved it since then.
Please tell us, when this problem will fixed? 
