2 x RB433AH
2 x R52Hn
2 x 30 inch Dual Polarised 5.4GHz Parabolic Dish antennae
I climbed up and down, aligned and re-aligned the dishes, changed cards, pig tails, cables and was contemplating getting alternative (even bigger) dishes on Monday, until I read that the signal strength should not be greater than -60dBm (mine was about -10dBm).
The link is only about 50 meters apart and the problem quite simply, as it turns out, that I was blasting the other side with an over amplified signal (amplified by the receptor having a dish too big for the distance).
I hope this helps others, our link is finally running at 300Mbps providing true TCP transfer rates of the maximum the 100Mbps ethernet port can provide...
set wlan1 tx-power-mode=all-rates-fixed tx-power=0
NB: Setting MCS doesn't appear to have any affect when using RouterOS 5.15, the units still slowly climb all the way through all intermediary link speeds before settling on 300Mbps.
set wlan1 ht-guard-interval=any ht-basic-mcs=mcs-0 ht-supported-mcs=mcs-0,mcs-7,mcs-15 set wlan1 ht-txchains=0,1 ht-rxchains=0,1
NB: Monitoring the WiFi link, after changing settings, will always show a speed of 6.5Mbps. This will only start to climb once the link has traffic to transfer (unlike 802.11a/b/g). This may not be a problem on a bridge link, but a routed link would only see traffic when sent to it. Not sure if this is a bug or simply a from of power saving.
status: connected-to-ess band: 5ghz-n frequency: 5180MHz wireless-protocol: nv2 tx-rate: 300.0Mbps rx-rate: 300.0Mbps ssid: Syrex_7avenue bssid: 00:0C:42:6C:BC:A5 radio-name: 27_7 signal-strength: -45dBm signal-strength-ch0: -47dBm signal-strength-ch1: -50dBm tx-signal-strength: -48dBm tx-signal-strength-ch0: -49dBm tx-signal-strength-ch1: -52dBm noise-floor: -115dBm signal-to-noise: 70dB tx-ccq: 100% rx-ccq: 99% authenticated-clients: 1 current-distance: 1 wds-link: no bridge: no routeros-version: 5.15