Community discussions

MikroTik App
 
yottabit
Member Candidate
Member Candidate
Topic Author
Posts: 198
Joined: Thu Feb 21, 2013 5:56 am

RB751G-2HnD Transmit Power Level

Tue Dec 31, 2013 11:27 pm

The RB751G spec is 1000 mW output power (31 dBm).

However, running RouterOS 6.7 with Tx Power Mode set to Card Rates and Tx Power set to 30 dBm, the Current Tx Power is only 17 dBm.

Running in United States regulatory domain, and 1000 mW is max allowable for 2.4 GHz.
[admin@rb1.domehq] > interface wireless export hide-sensitive 
# dec/31/2013 21:21:29 by RouterOS 6.7
# software id = EJA3-QE5Q
#
/interface wireless
set [ find default-name=wlan1 ] adaptive-noise-immunity=ap-and-client-mode band=2ghz-onlyn country="united states" disabled=no distance=indoors frequency-mode=regulatory-domain l2mtu=2290 mode=ap-bridge \
    preamble-mode=long ssid=Magrathea tx-power=30 tx-power-mode=card-rates wireless-protocol=802.11
/interface wireless security-profiles
set [ find default=yes ] authentication-types=wpa2-psk mode=dynamic-keys supplicant-identity=MikroTik

[admin@rb1.domehq] /interface wireless> manual-tx-power-table print 
 0 name="wlan1" manual-tx-powers=1Mbps:17,2Mbps:17,5.5Mbps:17,11Mbps:17,6Mbps:17,9Mbps:17,12Mbps:17,18Mbps:17,24Mbps:17,36Mbps:17,48Mbps:17,54Mbps:17,HT20-0:17,HT20-1:17,HT20-2:17,HT20-3:17,HT20-4:17,HT20-
                 5:17,HT20-6:17,HT20-7:17,HT40-0:17,HT40-1:17,HT40-2:17,HT40-3:17,HT40-4:17,HT40-5:17,HT40-6:17,HT40-7:17

[admin@rb1.domehq] /interface wireless> monitor wlan1 once 
                 status: running-ap
                   band: 2ghz-n
              frequency: 2412MHz
      wireless-protocol: 802.11
            noise-floor: -115dBm
         overall-tx-ccq: 97%
     registered-clients: 4
  authenticated-clients: 4
            wmm-enabled: yes
      current-tx-powers: 1Mbps:17(17/20),2Mbps:17(17/20),5.5Mbps:17(17/20),11Mbps:17(17/20),6Mbps:15(15/18),9Mbps:15(15/18),12Mbps:15(15/18),18Mbps:15(15/18),24Mbps:15(15/18),36Mbps:15(15/18),
                         48Mbps:15(15/18),54Mbps:15(15/18),HT20-0:15(15/18),HT20-1:15(15/18),HT20-2:15(15/18),HT20-3:15(15/18),HT20-4:15(15/18),HT20-5:15(15/18),HT20-6:15(15/18),HT20-7:15(15/18)
    current-ofdm-errors: 17
     current-cck-errors: 1
    notify-external-fdb: no
Any idea why? I know the RB751 had a lot of WiFi problems when it first came out... I'm hoping this limit of Tx power wasn't the solution to the problems because I bought it for the 1000 mW radio...
 
yottabit
Member Candidate
Member Candidate
Topic Author
Posts: 198
Joined: Thu Feb 21, 2013 5:56 am

Re: RB751G-2HnD Transmit Power Level

Tue Dec 31, 2013 11:40 pm

Alright so if I change Frequency Mode from regulatory-domain to manual-txpower, I can now get up to 27 dBm output power.

Unfortunately when I do that, the CCQ plummets to 20% average and the Mikrotik Bandwidth Test goes from 80 Mbps Rx to 6 Mbps Rx.

So I'm going to assume the problem with this model of hardware was poor radio implementation or antenna chain. Great.
 
Petzl
Member Candidate
Member Candidate
Posts: 214
Joined: Sun Jun 30, 2013 12:14 pm

Re: RB751G-2HnD Transmit Power Level

Wed Jan 01, 2014 7:19 pm

most of the 75x devices will slow down if the power is to high

i set it to 20dbm on all rates

Who is online

Users browsing this forum: gigabyte091 and 25 guests