1.3km link bad throughput help needed - PDF file attached

RouterOS Wireless Networking
1

Hello Folks

I recently established a wireless backhaul ptp link between my upstream provider and my datacenter (1.3km) with one RB411U (Bridge/Master with an R52hn card only chain 0 connected to 23dbi lanbowan panel antenna) and RB433 (station-bridge/slave also with an R52hn card only chain 0 connected to 23dbi lanbowan panel antenna).

I am experimenting with the NV2 protocol and both RB have latest firmware and ROS 5.11. Please find below screenshots of detailed setting, bandwidth test, spectral-history and topographic sketch in the pdf file attached to the post.

As can be seen the bandwidth sucks - 13mbps down and 2.3mbps up from station bridge side (given a steady signal strength range of -55dBm to -57dBm approx although noise floor seem a bit high -105dBm).

i will be very grateful if the ht-above and ht-below channel specification could be explained well to me with respect to using 40mhz channel width

This is very frustrating given the clear line of sight and large stock of RB433 boards and R52hn cards i have in stock (could it be the pigtails from the cards to the enclosures?) I am beginning to think these are fake boards

your assistance to rectify this problem would be very much appreciated :slight_smile:
1.3km-link.pdf (841 KB)
google-elevations.JPG
bandwidth-test.jpg

2

what is the channel width. i have used with 20mhz & signal chain and easily got 20mbps atleast for over 4 km link. have u wrongly aligned the antenna one horz. n the other vertical. or may be bad pigtails.
i don’t see any other reason.

3

I am using 20mhz channel width. Panel Antenna was installed at both ends with the manufacturer arrow pointer heads pointing upwards on both ends.

please also find attched pdf (attachment no.1) for more detail

thanks

4

First : select best frequency by using Frequency usage tool in both area.
Second : set channel width to 20Mhz
Third : use Nstream (Mikrotik compliant)

and see the results.(like CCQ and …)

5

Thanks

I changed from nv2 to nstream. I have seen positive changes in ping response for packet size 1500 (latency from average of 65ms to 8ms)

but am getting lot of hits in “current-ofdm-errors”. Is it possible to lock the link to certain speed. e.g. 45mbps.

I will visit the other side tomorrow and do some antenna alignments there.
nstream.jpg

6

5745 very noisy sometimes, because of 5470MHz-5825 is default frequency ranges of new UBNT products (AirOS) which always found in all areas!

good luck tomorrow