Hi
I have a PTP with two netmetals, a 34dbi ubiquiti parabolic and a mant30. 18Kms with free LOS. I thought that I would get 80Mbps on both way.
I set nstream. Configuration:
/interface wireless
set [ find default-name=wlan1 ] amsdu-limit=2048 antenna-gain=20 band=5ghz-onlyac basic-rates-a/g=“” channel-width=20/40mhz-Ce default-forwarding=no disabled=no
frequency=5715 frequency-mode=superchannel guard-interval=long ht-basic-mcs=mcs-7,mcs-8 ht-supported-mcs=
mcs-7,mcs-8,mcs-9,mcs-10,mcs-11,mcs-12,mcs-13,mcs-14,mcs-15 hw-retries=15 max-station-count=1 mode=bridge nv2-cell-radius=20 nv2-preshared-key=XXX
nv2-security=enabled radio-name=RR rate-set=configured rx-chains=0,1 scan-list=5000-5900 ssid=ITW_01.04 supported-rates-a/g=“” tdma-period-size=auto
tx-chains=0,1 vht-supported-mcs=mcs0-7 wireless-protocol=nstreme
/interface wireless nstreme
set wlan1 enable-nstreme=yes framer-limit=2096 framer-policy=exact-size
/interface wireless security-profiles
set [ find default=yes ] authentication-types=wpa2-psk eap-methods=“” mode=dynamic-keys supplicant-identity=MikroTik wpa2-pre-shared-key=XXX
CCQ RX doesn’t down but RX rate down from 270Mbs/40Mhz-2S to 65Mbps-20Mhz-1S (ht-basic-mcs) as you can see at attached images. SNR=61db, CCQ: 85/85% Signal strength: 51/51
ONLY one rate down the other no. 
Is it normal with those levels to get that result?
interferences? I tried 20 and 40 Mhz channel-width and several frequencies.
Someone know what must I do to prevent that ?
I read http://forum.mikrotik.com/t/problem-with-mount-point/94/1 , I don’t have doppler ball.
Maybe the distance is way too long for the devices selected?
Thank you in advance
