Strange SNR issue

RouterOS Wireless Networking
1

Hi all..

I have 2 6km links running in parallel. 1 is Vertically polarized and the other one is Horisontally polarized on 23dBi 5G Panels. They have been running stable for 2 months with about 30-35 dBi SNR.. (Best measured perfomance when they were installed). Now all of a sudden one of the links has gone beserk and gives me SNR from 50-70 (RSSI from -40 - 50) and the link throughput has fallen to something like 10Mbit/s UDP and a lot of packetloss.. SNR readings are the same in both ends. I have tried to turn down the TX power all the way down to 5dBm in both ends, and SNR decreases accordingly, but throughput drops down to almost nothing when having so low TX value.

Hardware is RB532a’s running 2.9.39, SR5 and 23 dBi Panels..

I have tried everything i think, changing band and tried out almost every channel in the 5Ghz spectrum and issue is still the same… Why do i have so much effect? I could understand one radio malfunction and gives wierd results but this ??? Btw, its the Horizontal polarized pair that is the problem…

Anyone seen this before?

Regards

/Henrik

2

If it was running fine for two months and the other link is working ok , it looks like a damaged radiocard , more so since some panels are not DC grounded ( ie if you stick a meter on the connector , it doesn’t appear as a short at DC ) .

3

Bushy,

Thank you for the answer, but.. should i see the high SNR values in both ends?

/Henrik