Why not set the Wifi signal strength above 16dBm?

Question

WiFi

[email protected]:~$ iwconfig wlan0
wlan0     IEEE 802.11bgn  ESSID:"wl0_Guest2"  
          Mode:Managed  Frequency:2.462 GHz  Access Point: 72:82:61:A5:21:78   
          Bit Rate=2 Mb/s   Tx-Power=16 dBm   
          Retry short limit:7   RTS thr:off   Fragment thr:off
          Power Management:off
          Link Quality=26/70  Signal level=-84 dBm  
          Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
          Tx excessive retries:187  Invalid misc:6320   Missed beacon:0

I put the country Bolivia

[email protected]:~$ sudo iw reg set BO
[email protected]:~$ sudo iw reg get
country BO: DFS-UNSET
  (2402 - 2482 @ 40), (N/A, 30)
  (5735 - 5835 @ 40), (N/A, 30)

I check that Tx-Power can be changed, put 10

[email protected]:~$ sudo iwconfig wlan0 txpower 10
[email protected]:~$ iwconfig wlan0
wlan0     IEEE 802.11bgn  ESSID:"wl0_Guest2"  
          Mode:Managed  Frequency:2.462 GHz  Access Point: 72:82:61:A5:21:78   
          Bit Rate=1 Mb/s   Tx-Power=10 dBm   
          Retry short limit:7   RTS thr:off   Fragment thr:off
          Power Management:off
          Link Quality=22/70  Signal level=-88 dBm  
          Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
          Tx excessive retries:9  Invalid misc:29   Missed beacon:0

10 installed, trying 30

[email protected]:~$ sudo iwconfig wlan0 txpower 30
[email protected]:~$ iwconfig wlan0
wlan0     IEEE 802.11bgn  ESSID:"wl0_Guest2"  
          Mode:Managed  Frequency:2.462 GHz  Access Point: 72:82:61:A5:21:78   
          Bit Rate=1 Mb/s   Tx-Power=16 dBm   
          Retry short limit:7   RTS thr:off   Fragment thr:off
          Power Management:off
          Link Quality=21/70  Signal level=-89 dBm  
          Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
          Tx excessive retries:9  Invalid misc:29   Missed beacon:0

Failure! Let's try to install in mW

wlan0     unknown transmit-power information.

          Current Tx-Power=16 dBm  	(39 mW)

16dBm is ~39mW, let's try 20mW, see if it works

[email protected]:~$ sudo iwconfig wlan0 txpower 20mW
[email protected]:~$ iwconfig wlan0
wlan0     IEEE 802.11bgn  ESSID:"wl0_Guest2"  
          Mode:Managed  Frequency:2.462 GHz  Access Point: 72:82:61:A5:21:78   
          Bit Rate=1 Mb/s   Tx-Power=14 dBm   
          Retry short limit:7   RTS thr:off   Fragment thr:off
          Power Management:off
          Link Quality=18/70  Signal level=-92 dBm  
          Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
          Tx excessive retries:14  Invalid misc:46   Missed beacon:0
[email protected]:~$ sudo iwlist wlan0 txpower
wlan0     unknown transmit-power information.

          Current Tx-Power=14 dBm  	(25 mW)

Trying 75mW

[email protected]:~$ sudo iwconfig wlan0 txpower 70mW
[email protected]:~$ iwconfig wlan0
wlan0     IEEE 802.11bgn  ESSID:"wl0_Guest2"  
          Mode:Managed  Frequency:2.462 GHz  Access Point: 72:82:61:A5:21:78   
          Bit Rate=11 Mb/s   Tx-Power=16 dBm   
          Retry short limit:7   RTS thr:off   Fragment thr:off
          Power Management:off
          Link Quality=17/70  Signal level=-93 dBm  
          Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
          Tx excessive retries:17  Invalid misc:46   Missed beacon:0
[email protected]:~$ sudo iwlist wlan0 txpower
wlan0     unknown transmit-power information.

          Current Tx-Power=16 dBm  	(39 mW)

As you can see, above 16dBm and 39 mW Tx-Power does not set, what to do?

Answer 1

And why did they decide that this unknown device can do more?

Answer 2

I wouldn't recommend adding more. if low power has not yet been studied, then a relatively large one has many minuses (primarily for health), for the wallet (fines), for nerves (active grandmothers and conscious citizens).