I have a back haul setup between two places, about 19Km apart. I am using the MikroTik QRT5 units on either end, RB911G-5HPnD. My signal strength is -60 on both ends and CCQ values are 95 - 100% and my ping times are on average 3ms. My problem is I am getting about 10% packet loss on this link. On the receiving side it shows up as the Internet just hangs for a few seconds, pauses if you will, then takes right off. From the AP side using the QRT's ping tool I am getting about 10% packet loss. When I lose packets it is always 6 pings long, sometimes just an occasional signal packet, it’s these long losses that the other end sees. I have changed frequencies, channel widths, wireless protocols, wireless modes ( A and N modes), TDMA Period Size when using NV2 and Adaptive Noise Immunity serrings. My noise floor is -114 dBm. Nothing I do seems to fix the problem. Does anyone else have an idea I can try as I'm sure I haven't thought of it all? Has anyone else encountered this behavior? I can provide support files and config's if needed.

Have you seen if there's any desconection message in the log?

Could you show us your config?

I think you should use bigger antenna for that link...

Regards

There are no disconnect messages in the log. Below is my current config.
AP Side

# oct/13/2015 09:27:02 by RouterOS 6.32.2
# software id = J0RB-4KVA
#
/interface bridge
add name=bridge1
/interface wireless
set [ find default-name=wlan1 ] adaptive-noise-immunity=ap-and-client-mode \
ampdu-priorities=0,1,2,3,4,5,6,7 antenna-gain=24 band=5ghz-onlyn \
basic-rates-a/g=6Mbps,9Mbps,12Mbps channel-width=10mhz country=\
"united states" default-forwarding=no disabled=no frequency=5275 \
frequency-mode=superchannel mode=ap-bridge radio-name=BH-MAINTWR-MOORELAND \
ssid=BH-MOORELAND supported-rates-a/g=6Mbps,9Mbps,12Mbps,18Mbps,24Mbps \
wds-default-bridge=bridge1 wds-mode=dynamic wireless-protocol=nv2
/interface ethernet
set [ find default-name=ether1 ] advertise=\
10M-half,10M-full,100M-half,100M-full
/interface wireless wds
add disabled=no master-interface=wlan1 name=Mooreland-Tower wds-address=\
4C:5E:0C:81:A3:25
/interface wireless nstreme
set wlan1 enable-nstreme=yes
/interface wireless security-profiles
set [ find default=yes ] authentication-types=wpa2-psk eap-methods="" mode=\
dynamic-keys supplicant-identity=MikroTik wpa2-pre-shared-key=4B11045499FC
/ip ipsec proposal
set [ find default=yes ] enc-algorithms=aes-128-cbc
/interface bridge port
add bridge=bridge1 interface=ether1
add bridge=bridge1 interface=wlan1
/ip address
add address=10.231.1.2/24 interface=bridge1 network=10.231.1.0
/ip route
add distance=1 gateway=10.231.1.1
/ip service
set www disabled=yes
set api disabled=yes
set api-ssl disabled=yes
/system clock
set time-zone-name=America/Chicago
/system identity
set name=BH-MAINTWR-MOORELAND
/system leds
set 0 interface=wlan1
/system ntp client
set enabled=yes primary-ntp=10.100.10.2
/system routerboard settings
set cpu-frequency=600MHz
/system scheduler
add name=Reboot on-event=Reboot policy=\
ftp,reboot,read,write,policy,test,password,sniff,sensitive start-dat
oct/07/2015 start-time=03:43:26
/system script
add name=Reboot owner=admin policy=\
ftp,reboot,read,write,policy,test,password,sniff,sensitive source=\
"/system reboot"

Station Side

# oct/13/2015 14:29:06 by RouterOS 6.32.2
# software id = HEF7-KS5I
#
/interface bridge
add name=bridge1
/interface wireless
set [ find default-name=wlan1 ] ampdu-priorities=0,1,2,3,4,5,6,7 band=\
5ghz-onlyn channel-width=10mhz default-forwarding=no disabled=no \
frequency=5280 frequency-mode=superchannel mode=station-wds radio-name=\
BH-MOORELAND-MAINTWR ssid=BH-MOORELAND
/interface ethernet
set [ find default-name=ether1 ] advertise=\
10M-half,10M-full,100M-half,100M-full
/interface wireless nstreme
set wlan1 enable-nstreme=yes
/interface wireless security-profiles
set [ find default=yes ] authentication-types=wpa2-psk eap-methods="" mode=\
dynamic-keys supplicant-identity=MikroTik wpa-pre-shared-key=4B11045499FC \
wpa2-pre-shared-key=4B11045499FC
/ip ipsec proposal
set [ find default=yes ] enc-algorithms=aes-128-cbc
/interface bridge port
add bridge=bridge1 interface=ether1
add bridge=bridge1 interface=wlan1
/interface wireless align
set receive-all=yes
/ip address
add address=10.231.1.3/24 interface=bridge1 network=10.231.1.0
/ip route
add distance=1 gateway=10.231.1.1
/ip service
set www disabled=yes
set api disabled=yes
set api-ssl disabled=yes
/system identity
set name=BH-MOORELAND-MAINTWR
/system leds
set 0 interface=wlan1
/system ntp client
set enabled=yes primary-ntp=10.100.10.100
/system routerboard settings
set cpu-frequency=600MHz
/system scheduler
add name=Reboot on-event=Reboot policy=\
ftp,reboot,read,write,policy,test,password,sniff,sensitive start-date=\
oct/07/2015 start-time=03:45:06
/system script
add name=Reboot owner=admin policy=\
ftp,reboot,read,write,policy,test,password,sniff,sensitive source=\
"/system reboot"

Why do you use WDS? From a few years ago, is not neccesary to get a transparent link.

Try to switch it to bridge > station bridge

Regards

jayk, have you had any progress with this? Has any recent ROS udpates helped at all? I am using a lot of NV2 links(farther distance) and trying to figure out similar issues. I am using different antennas and radios, but I am more curious on NV2 function. I am kind of amazed you are getting that good of connection, at that distance, using that type of antenna.