Hello
I did some testing on a 45 km link using the new protocols will I write the following results:
on both sides have the following and hardware RB411AH --> Ubiquiti SR71-15 --> Jirous 29dB 3mt cable LMR-400

Config 1
Band: A 5GHz
Wireless Protocoll: NV2
HT:Tx/RX 0 and Tx/RX 1
Frequence: 5430
Antenna jirous Dual Pol 29dB
with this configuration, the link is unstable, disconnects constantly and rates are low


Config 2
Band: A 5GHz
Wireless Protocoll: Nstreme
HT: Tx/RX 0 and Tx/RX 1
Frequence: 5430
Antenna jirous Dual Pol 29dB
with this configuration, the link is stable and does not disconnect rate is never more than 54Mb/54Mb I noticed that the pings are the order of 2 / 3 ms

Config 3
Band: N-only 5GHz
Wireless Protocoll: Nstreme
HT: Tx/RX 0 and Tx/RX 1
Frequence: 5430
Antenna jirous Dual Pol 29dB
with this configuration, the link is stable but the rates are low 24Mb/6-9Mb pings are good

Config 4
Band: N-only 5GHz
Wireless Protocoll: NV2
HT: Tx/RX 0 and Tx/RX 1
Frequence: 5430
Antenna jirous Dual Pol 29dB
with this configuration, the link is instabilissimo continuous disconnections 24Mb/18Mb low rate and high ping 150ms

I can say that it is concluded that N and NV2 need to be reviewed or something I'm wrong.

please contact support@mikrotik.com and include the support output files.

Have you tried changing channels?

All of your tests indicate you're using the same channel?

Frequent disconnects like that are usually a sign of some sort of interference or RF related issue.

We can do all the tests you want, the reality is that the protocol 802.11-N is not indicated for long distances, I have reflected much wisp who told me that beyond 20 km N protocol is very unstable.

Could you share your signal levels?

also share with us the distance / ack timeout settings you are using, as well as NV2 Time and Cell Radius.

Since I did that link I effettuamo hundreds of hints, and all with negative results on the basis of this and other experiences from other wisp tell you that even the 802.11-N and NV2 are absolutely not good for long links distance.

Since I did that link I effettuamo hundreds of hints, and all with negative results on the basis of this and other experiences from other wisp tell you that even the 802.11-N and NV2 are absolutely not good for long links distance.

I do not agree with this, not knowing what hints you have already tried so i can only say what worked for me when i had frequent disconnects using NV2,

I assume your signal levels, CCQ, SNR, noise floor - are good at both ends,

Is there a power offset to be used for SR71-15?

Firmware upgrade of the 411AH, try another frequency, try another radio card(s) different antenna, check for interference,