Is it possible that wlan on SXT is damaged?
it was fine 2-3 days before
rx signal is fine tx is bad
Looks like it is, with about 30db difference between TX/RX but still has a very good signal to noise of 57db which is probably for RX.
What other clients on this PtMP? The same problem?
Or it is P2P link between two SXT?
are both chains turned on ?
seems that one of them is off
wireless interface/HT
It seems that transmitter in this unit has blown off. This behavior is pretty often seen on r52hn cards. I have RMA’ed few of them previously..
I have a different problem though with SXTs: the signal strength are worse in chain0 rx and chain1 tx.
It looks like this in registration list:
Tx/Rx Signal Strength: -69/-69
Tx/Rx Signal Strength ch0: -68/-80
Tx/Rx Signal Strength ch1: -80/-70
The LoS is perfect, distance=1km, aligned the best as possible. I’m sure replacing the unit will solve the problem since it helped in exact same situation before. I’m not sure what to do with these units, because otherwise they are working very well..
This kinda problem has happened after a good downpour on my Grooves. have mailed with supout.rif to support & waiting for reply. I tried to reset & upgrade rOs but didnt help.
Replacing them with fresh pieces did help.
Yest its P2MP
Sector <->SXT’s
Only this SXT have low tx signal
I changed with new one signal is good now (with new one)
its strange because its almost new unit about 10-12 working days no blackouts no lighting only high temp >42C
I have three grooves with broken transmitter, how to send them on RMA? Problem is i dont know where this RB been buyed, ill buy them from second hand 
Can support from MT tell me from which resseler in Poland they are?
Tadam! Grooves was sent to Latvia, we will wait for answer from MT RMA 
LOL - package on the place today 23.11.2012, was sent from Poland 16.11.2012…
Doagnostic/fixing x3 - then… …yesterday units sent to me!
Grooves repaired, not tested (end of the year, too much work)
Looks like new ones, but this is that grooves was i sent.
How to broke grooves in poland 
http://allegro.pl/mikrotik-groove-5hn-wlan-5-ghz-1x-lan-level-3-i2907300091.html