RUT240 : set WiFi power to maximum

NETWORKING SOLUTIONS
1

Hello,
On a RUT240, I’d like to increase the Wi-Fi power to the maximum possible. The “iwinfo wlan0 txpower” command gives 16 dBm, while the maximum displayed is 18 dBm:
root@RUT240:~# iwinfo wlan0 txpower
0 dBm (1 mW)
1 dBm (1 mW)
2 dBm (1 mW)
3 dBm (1 mW)
4 dBm (2 mW)
5 dBm (3 mW)
6 dBm (3 mW)
7 dBm (5 mW)
8 dBm (6 mW)
9 dBm (7 mW)
10 dBm (10 mW)
11 dBm (12 mW)
12 dBm (15 mW)
13 dBm (19 mW)
14 dBm (25 mW)
15 dBm (31 mW)

  • 16 dBm (39 mW)
    17 dBm (50 mW)
    18 dBm (63 mW)

Yet, in the /etc/config/wireless file, there is “option txpower ‘18’”
Can you help me?
Thank you very much!

3

Hello,

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%.

You can find more detailed information on this process on wiki page here: RUT240 Wireless - Teltonika Networks Wiki

If you have any further questions, feel free to reach out.

Best regards,

4

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?

5

Hello Martynas,
Would you have a solution to this problem?
Thanks in advance

6

Hello,

Thank you for your patience.

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

Best regards,

7

Hello Martynas,
Here is the information :

  • FW RUT2_R_00.07.06.17
  • Location : France
  • Network → Wireless → Radio settings : Country US - Transmit power 100 %
  • Channel width : 20 Mhz
  • Power supply : original default one
  • If i choose France as country, the power level is only 13 dBm !!!

Commands runned :
root@RUT240:~# iwinfo wlan0 txpower
0 dBm ( 1 mW)
1 dBm ( 1 mW)
2 dBm ( 1 mW)
3 dBm ( 1 mW)
4 dBm ( 2 mW)
5 dBm ( 3 mW)
6 dBm ( 3 mW)
7 dBm ( 5 mW)
8 dBm ( 6 mW)
9 dBm ( 7 mW)
10 dBm ( 10 mW)
11 dBm ( 12 mW)
12 dBm ( 15 mW)
13 dBm ( 19 mW)
14 dBm ( 25 mW)
15 dBm ( 31 mW)
** 16 dBm ( 39 mW)
17 dBm ( 50 mW)
18 dBm ( 63 mW)
root@RUT240:~# iw dev wlan0 set txpower fixed 63mW
root@RUT240:~# wifi down
root@RUT240:~# wifi up
root@RUT240:~# iwinfo wlan0 txpower
0 dBm ( 1 mW)
1 dBm ( 1 mW)
2 dBm ( 1 mW)
3 dBm ( 1 mW)
4 dBm ( 2 mW)
5 dBm ( 3 mW)
6 dBm ( 3 mW)
7 dBm ( 5 mW)
8 dBm ( 6 mW)
9 dBm ( 7 mW)
10 dBm ( 10 mW)
11 dBm ( 12 mW)
12 dBm ( 15 mW)
13 dBm ( 19 mW)
14 dBm ( 25 mW)
15 dBm ( 31 mW)
** 16 dBm ( 39 mW)
17 dBm ( 50 mW)
18 dBm ( 63 mW)

Same with :
root@RUT240:~# uci set wireless.radio0.txpower=‘63’
root@RUT240:~# uci commit wireless
root@RUT240:~# wifi reload
root@RUT240:~# iwinfo wlan0 txpower
0 dBm ( 1 mW)
1 dBm ( 1 mW)
2 dBm ( 1 mW)
3 dBm ( 1 mW)
4 dBm ( 2 mW)
5 dBm ( 3 mW)
6 dBm ( 3 mW)
7 dBm ( 5 mW)
8 dBm ( 6 mW)
9 dBm ( 7 mW)
10 dBm ( 10 mW)
11 dBm ( 12 mW)
12 dBm ( 15 mW)
13 dBm ( 19 mW)
14 dBm ( 25 mW)
15 dBm ( 31 mW)
** 16 dBm ( 39 mW)
17 dBm ( 50 mW)
18 dBm ( 63 mW)

Best regards

8

Hello,

Thank you for sharing additional details.

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?

Best regards,

9

Hello Martynas,

root@RUT240:~# iw reg get
global
country US: DFS-FCC
(2400 - 2472 @ 40), (N/A, 30), (N/A)
(5150 - 5250 @ 80), (N/A, 23), (N/A), AUTO-BW
(5250 - 5350 @ 80), (N/A, 23), (0 ms), DFS, AUTO-BW
(5470 - 5730 @ 160), (N/A, 23), (0 ms), DFS
(5730 - 5850 @ 80), (N/A, 30), (N/A)
(57240 - 71000 @ 2160), (N/A, 40), (N/A)

The WiFi antenna is the stock/default one supplied with the RUT240.
The router is about 280 km away. I am unable to test factory settings.

10

Hello,

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.

Best regards,