5GHz bridge based on RB911G-HPacD, distance ca. 1,7km

I’ve got troubles with CCQ on this bridge value between 30-50% and link down’s, and when i ping both ends of bridge each other sometimes i get time like 450-1000 ms. Bridge is connecting two parts of my network (two part of city), when i 'm testing one or other part to the bridge everything is ok, but when i try to ping other side of bridge time of ping is increasing,

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-try nstreme
-signal is to low, for a reliable link signal should be -50…-55
-5865mhz is to high for most antennas, try 5300-5600mhz