I'm in a very weird position here.
Recently we had to upgrade an old link, with RB433's and R52 cards. there was some significant loss of signel due to long rgc-213 cable run and pig-tails, and the old 300mhz RB433's were saturating due to lots of IRQ from the cards.
Since i can't change the antennas (two big 1.8meter SISO monster-dishes), i tought i would install GROOVE_AC's directly to the dishes, and with better signal hopefully archieve more than the 60mb the old link was capable of.
Apparently i was wrong.
The old link operated at 40mhz/108mbps 24/7 with 99%CCQ and -60db recieved. 60mb/s troughput guaranteed
The new link is only ever stable at n-only mcs6-only 20mhz (forced trough configs). -50db recieved (tx capped at +14) this pushes 50mb/s reliably (99/99%CCQ )
The problem is that AC-mode (VHT) is a dumb setting that jumps all over the place (mcs0-thru-9), and any channel-width that is not 20mhz is just a big mess of falling back to 20mhz, or 80/40/20 intermitently. this jumpiness between 20/40 is also seen in n-only mode. overall CCQ stays around 50/50%
There is no 30mhz channels because they are not supported in the AC chipset, so no 5, no 10, and no 30mhz for you sir.
So now i'm in the weird position of explaining why this 10-year-newer equipment actually performs worse than the old equipment!?
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apr/06/2018 01:52:25 by RouterOS 6.41.3
software id = 4L6W-XXXX
model = RouterBOARD Groove GA-52HPacn
serial number = 72250547XXXX
/interface wireless
set [ find default-name=wlan1 ] adaptive-noise-immunity=ap-and-client-mode
band=5ghz-onlyn basic-rates-a/g="" basic-rates-b="" country=brazil
disabled=no distance=17 frequency=5680 frequency-mode=superchannel
hide-ssid=yes ht-basic-mcs=mcs-6 ht-supported-mcs=mcs-6 mode=ap-bridge
name=NAME nv2-cell-radius=17 nv2-downlink-ratio=75 nv2-mode=
fixed-downlink nv2-qos=frame-priority radio-name=RADIONAME
rate-set=configured scan-list=5680 ssid=SSID supported-rates-a/g=
"" supported-rates-b="" tdma-period-size=3 tx-power=14 tx-power-mode=
all-rates-fixed vht-basic-mcs="" vht-supported-mcs="" wds-default-bridge=
0BDG wds-mode=dynamic wireless-protocol=nv2 wps-mode=disabled
Any suggestions on how to make the AC/40 modes operate reliably?
This is in the same frequency it was operating before, and there is no interference (the closest shown by frequency usage are 5625 and 5700)