My machine (rc10 x86) is access point with XR5, and the link has nstream with exact size 4000
There is only one client with 2.9.27 and a cm6
When the txpower is at default the link works for hours with tx/rx signal -38/-45 and noise -91

when i try to lower the power of xr5 at mikrotik rc10 x86 from the default value to 20
the connection becomes very unstable . The tx signal fluctuates betwen -45 and -85
and the noise fluctuates betwen -91 and -111 within milliseconds.
The client connects for a second and immediately
disconnects in an endless loop.


If the client becomes AP and i client the same situation.

The link was working fine before with 2.9.xx at both sides (with half of the tx power i use at 3rc10)

Not sure if you were aware of the power offset. I believe this still applies to V3. I have read setting the power above the default(18) can cause some strange behavior.
http://www.ubnt.com/downloads/SRXR_power_offset.pdf
You may also want to call Ubiquiti directly. I have been told they are really nice. They may have a more concise answer.

Actually by putting 20 i LOWER the power. The default is more than this (i have to check exactly how bigger)

If i go less than 20 then it can not connect at all.
With the default (around 22 but i will check the exact value)) my client has a signal of -38
With 20 the signal fluctuates betwen -45 and -85 within milliseconds!!!
It seems like the radio is almost switched off and on consequently within fractions of a second

Actually by putting 20 i LOWER the power. The default is more than this (i have to check exactly how bigger)

If i go less than 20 then it can not connect at all.
With the default (around 22 but i will check the exact value)) my client has a signal of -38
With 20 the signal fluctuates betwen -45 and -85 within milliseconds!!!
It seems like the radio is almost switched off and on consequently within fractions of a second

That's because you're overdriving the radio significantly and causing it to fail. With the offset, you're realy trying to push 30dBm over a radio that only wants to do 26 or 28.

If you want the radio to do 20dBm, set it to 10dBm in Mikrotik.

Good luck.

Jon

I verify the transmit power of the radio by the signal my client receives me.
As i told you,when i put default Mikrotik reports a value of 22(12 dbm) and my client receives me at -38
When i put transmit level 20 , mikrotik reports transmit power of 10dbm and my client receives me at -45 for few millisecons,
then -85 then -45 again etc
If i put transmit power lower than that (i tried many values 17, 15 , 10 , 0 ) mikrotik reports 7, 5, 0 ,0 dbm and my client
does not receive me at all.

Previously with 2.9.48 and a cm9(which has one sixth of the transmit power of an xr5) i used a value of 10 and my client received me at -45 ....

Unfortunately it is not possible to use 2.9.xx now, as it does not support the lan chipset of my new board

Found the problem....
It was a device that protects from thunders that was causing the problem
It is for one use only and probably the gas inside it was damaged due to
a thunder without me noticing.
Now removed and no more disconnects

Also, know crash issue in rc10/11. Upgrade...

Also, know crash issue in rc10/11. Upgrade...

There is no RC12 at the moment. Is this a typing error on your part?

Malcolm

nope, there will be rc12 out shortly. Just saying rc12 has a fix for this.

nope, there will be rc12 out shortly. Just saying rc12 has a fix for this.

I think that may be a bad idea!!

"Warning, v3rc12 has an error when upgrading the x86 version.
There are no know issues for v3rc12 when upgrading RouterBOARDS.
Please wait for for v3rc13."

yep seen that lol