The situation is as follows:
LoS 12 km, one side 130 meters above sea level, other 400.
Two yirous jrc-29 duplex antenna, Rb433GL with R52Hn, other side Rb711-5Hnd.
No other 5Ghz radio around.
Picture attached for more info…
Can I achieve better results?
Tnx.
What do you mean by “better results”? Are you not getting the desired throughput, trying to boost S/N ratio, getting dropped packets, etc.?
ch0 Rx and ch1 Tx are not functioning as it should be. Check the pigtails.
edit: now I see you might not activate ch1 on the cards in HT tab or you have some kind of combination.
of course throughput, isn’t it typically imperative for all PtP links? 
The problem is certainly in signal.
Pigtails and cards checked, i play with ch0 and ch2 and hor. vert. combination:
If on one side ch0 is vert. polarization and ch1 hor. polarization that’s mean that on other side the combination must be the same or it is unimportant?
Yes, polarity selections need to be the same on both sides. If your ch1 is where you are experiencing problems, try changing polarities/frequencies. Your original post said that there were no other 5.8 GHz radios around, but you would not be experiencing the signal loss you are without some kind of interference and/or a bad configuration. Especially since your other channel looks fine.
Yes there are no other radios in 5 Ghz.
But only thing now is antenna, jr-29 MIMO to check if there is some kind of problem, condensation…
Unfortunately the problem is in the antenna.
JR-29 MIMO antenna has one big flaw, N type connector for vertical pol.antenna is placed it top off antenna!
We’ve had problems before with these because water condensate inside top N female although good isolation. From time to time (around a few months) water fill connector and you have a problem!
That will do it. Try getting some rubber tape or coax seal and wrapping it around the connector. It’s not foolproof but it seems to work pretty well for me.
Now I got better throughput, 50/110 Mbps at 12 km.
But can someone explain meaning of the signal strength for ch0 and ch1
Tx/Rx signal strength Ch0: -79/-66 dBm
Tx/Rx signal strength Ch1: -58/-57 dBm
What mean Tx what Rx signal strength ex. Ch0 if one pol. antenna on other side can see only the same pol antenna at the other side..
In my case I cant get bether Tx signal strength on Ch0 (-79 dBm) ???
Essentially your Tx/Rx is your transmit/receive power levels. So if your ch0 is -79/-66 dBm, that means you are transmitting at -79 dBm (the power level the other end receives) and receiving at -66 (the power level received from the other end) dBm. Average noise levels in the 5.8 GHz spectrum are about -90 to -96 dBm, unless you are near a major metropolitan area, in which case they could be higher. You want to aim for the low 70’s at a minimum for PtP links. If you don’t get to the low 70’s you will experience dropped packets and degraded throughput.
You’ve said twice that there are no other 5.8 GHz radios around. I seriously doubt that’s true since 5.8 GHz is an unlicensed part of the spectrum and would venture to guess that your problem is interference. Try changing the frequency you are broadcasting on. If that doesn’t work, re-aim your antenna. If neither of those work, you are pretty much out of luck. About the only other option would be to add more power but I’m sure you are already broadcasting at the maximum allowable power.
Horizontal and Vertical polarity antennae can only “see” the same polarity signal because that is what they are designed to do. Using different polarities effectively doubles the usable spectrum by letting people transmit on the same frequency at the same time using different polarities. Literally, it means that the sine wave generated by your equipment is either vertically or horizontally oriented with respect to the ground. If your antenna is designed to pick up horizontally oriented sine waves, it won’t be able to pick up vertically oriented waves.
Tnx krashmo!
No, I have definitely clean 5 Ghz band. it is the rural area, 50 km from metropola but in other direction. noise levels is <-100 dBm.
Can mobile base station cause interference (900 Mhz band)?
900 MHz frequencies can cause interference with other 900 MHz equipment but it shouldn’t affect your 5.8 GHz equipment. Even if you have two AP’s on the same tower running on 5.8 GHz and 900 MHz they shouldn’t interfere with each other. These kinds of radios all have filter circuits that filter out all signals except the ones in the operational band of the radio.
Then I am out of luck 