The transmit power for the WiFi band can be adjusted by navigating to Network → Wireless → General Setup settings in the device’s WebUI. There you can set the desired transmit power up to 100%.
Thanks for your reply, but the setting in the interface is already 100%, and “iwinfo wlan0 txpower” shows 16 dBm, instead of the maximum of 18 dBm.
I tried running “iw dev wlan0 set txpower fixed 1800”. The setting remains for a few minutes, then returns to 16 dBm.
Is it possible to force 18 dBm?
I’ve checked the wlan0 txpower on a RUT240 (FW RUT2_R_00.07.06.17) on my side, and it appears that 18 dBm is being used by default without issue.
Could you please clarify which country the device is being operated in, and which country is selected under Network → Wireless → Radio settings on your device? Also, please ensure the channel width is set to 20 MHz, as this can influence available power levels.
Additionally, may I ask what power supply unit you’re using with the router? Is it the original default one (9 W)?
For testing purposes, you can try running:
iw dev wlan0 set txpower fixed 63mW
then restart wifi:
wifi down
wifi up
or alternatively using UCI set command:
uci set wireless.radio0.txpower='63'
uci commit wireless
wifi reload
Could you please also provide the output of the following command when the country is set to US:
iw reg get
Additionally, could you confirm what type of WiFi antenna you’re currently using? Is it the stock/default one supplied with the RUT240, or a third-party antenna?
Moreover, I assume the same Wi-Fi TX power limitation can also be noticed on a fresh, factory reset device?
Just to clarify, in France, as in the rest of the EU, the maximum allowed 2.4 GHz WiFi transmit power is 100 mW (20 dBm). Exceeding this threshold is not permitted under local regulations.
The stock antenna supplied with the RUT240 has a gain of 5 dBi, which, when combined with a transmit power setting of around 16 dBm on the device, reaches close to that legal 20 dBm EIRP limit.
In your case, I’d recommend setting the country to France and the transmit power to 100% , this should be fully compliant and provide stable results with the stock antenna.