Good RX bad TX

RouterOS Wireless Networking
1

Hi,

I’m looking for some advice

I have an RB912 connected to a sector antenna with a few SXT clients connect to it.

I’m using ROS6.15 with NV2 and tdma set to auto.

My Uploads from this site is very bad. I can’t understand why. Signal strength looks good, and surley if it was an interference thing both Tx & Rx would suffer (as the data goes to both the SXT and the 912)

Any advice or suggestions would be great

 0 interface=wlan1-gateway ap=yes wds=no bridge=no rx-rate="65Mbps-20MHz/1S" 
   tx-rate="58.5Mbps-20MHz/1S" packets=9093070,11265764 bytes=1128116847,1066650774 frames=5355010,10433830 frame-bytes=1140123857,1070414561 
   uptime=4d17h53m25s last-activity=0ms signal-strength=-56dBm signal-to-noise=62dB signal-strength-ch0=-57dBm signal-strength-ch1=-63dBm 
   tx-signal-strength-ch0=-60dBm tx-signal-strength-ch1=-67dBm 
   strength-at-rates=-56dBm@6Mbps 0ms,-56dBm@9Mbps 10h27m14s880ms,-57dBm@12Mbps 2d1h31m28s930ms,-56dBm@18Mbps 9h19m17s200ms,-57dBm@24Mbps 23m20s620ms,-
                  57dBm@36Mbps 4m47s280ms,-56dBm@48Mbps 21s330ms,-56dBm@54Mbps 21s790ms,-55dBm@HT20-0 10h27m51s20ms,-57dBm@HT20-1 10h27m51s80ms,-
                  56dBm@HT20-2 10h27m50s890ms,-56dBm@HT20-3 1h12s590ms,-56dBm@HT20-4 52m5s30ms,-56dBm@HT20-5 2m30s70ms,-56dBm@HT20-6 10ms,-56dBm@HT20-7 
                  10ms 
   tx-signal-strength=-59dBm tx-ccq=27% rx-ccq=83% distance=3 routeros-version="6.15" last-ip=172.16.1.20 encryption=aes-ccm group-encryption=aes-ccm 
   tx-rate-set="OFDM:6-54 BW:1x SGI:1x HT:0-8" tdma-timing-offset=14 tdma-tx-size=496 tdma-rx-size=2544 tdma-retx=89 tdma-winfull=48
2

It is most probably interference. The tx ccq is very low and that is why your uploads are very slow. The ccq can be bad only in one direction. The other side can’t hear you.
First thing you can do is try a different frequency. And if the tower you are using has a lot of antennas on it - it can be noise from nearby devices. If changing frequency doesn’t help you need to think about some rf shielding.

3

Thanks for the advice. I’ve never had such an issue before.

So I’m getting a new Sector tomorrow (the one I have my supplier does not sell shields for). Then will try that.

The strange thing is that the frequency that I chose has very low usage (according the Freq Usage) and the noise floor is pretty high accros the board >110.

Surely if it was noise then the noise floor would be lower?

Could it be faulty connectors (that would impact Tx aswell tho?)?

Is there something I can do to verify whether it is noise causing the issue?