27 Replies Latest reply on Apr 14, 2013 9:14 PM by wallarug

    RT3070 wireless adapter adjust tx power??

    wallarug

      I seem to be unable to adjust the tx power above 20dbm.  I have tried: 'iwconfig wlan0 txpower 22' but this does not change the txpower.

       

      I have also disabled the power-management.

       

      The adapter claims that it can hit 5800mW of power which aquates to about 37dBm.

       

      Does anyone know how I can get the txpower up? (I can put it down, just not up)

       

      root@raspberrypi:~# lsusb

      Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

      Bus 001 Device 002: ID 0424:9512 Standard Microsystems Corp.

      Bus 001 Device 003: ID 0424:ec00 Standard Microsystems Corp.

      Bus 001 Device 004: ID 148f:3070 Ralink Technology, Corp. RT2870/RT3070 Wireless Adapter

      root@raspberrypi:~# iwconfig wlan0 txpower 30

      Error for wireless request "Set Tx Power" (8B26) :

          SET failed on device wlan0 ; Invalid argument.

      root@raspberrypi:~#

        • Re: RT3070 wireless adapter adjust tx power??
          wallarug

          adding to this, how can I tell if my card supports AP mode?  I tried iw list but this is what I got:

           

          root@CMDoverwatch:~# iw list

          Wiphy phy0

                  Band 1:

                          Capabilities: 0x172

                                  HT20/HT40

                                  Static SM Power Save

                                  RX Greenfield

                                  RX HT20 SGI

                                  RX HT40 SGI

                                  RX STBC 1-stream

                                  Max AMSDU length: 3839 bytes

                                  No DSSS/CCK HT40

                          Maximum RX AMPDU length 65535 bytes (exponent: 0x003)

                          Minimum RX AMPDU time spacing: 2 usec (0x04)

                          HT RX MCS rate indexes supported: 0-7, 32

                          TX unequal modulation not supported

                          HT TX Max spatial streams: 1

                          HT TX MCS rate indexes supported may differ

                          Frequencies:

                                  * 2412 MHz [1] (20.0 dBm)

                                  * 2417 MHz [2] (20.0 dBm)

                                  * 2422 MHz [3] (20.0 dBm)

                                  * 2427 MHz [4] (20.0 dBm)

                                  * 2432 MHz [5] (20.0 dBm)

                                  * 2437 MHz [6] (20.0 dBm)

                                  * 2442 MHz [7] (20.0 dBm)

                                  * 2447 MHz [8] (20.0 dBm)

                                  * 2452 MHz [9] (20.0 dBm)

                                  * 2457 MHz [10] (20.0 dBm)

                                  * 2462 MHz [11] (20.0 dBm)

                                  * 2467 MHz [12] (20.0 dBm) (passive scanning, no IBSS)

                                  * 2472 MHz [13] (20.0 dBm) (passive scanning, no IBSS)

                                  * 2484 MHz [14] (20.0 dBm) (passive scanning, no IBSS)

                          Bitrates (non-HT):

                                  * 1.0 Mbps

                                  * 2.0 Mbps (short preamble supported)

                                  * 5.5 Mbps (short preamble supported)

                                  * 11.0 Mbps (short preamble supported)

                                  * 6.0 Mbps

                                  * 9.0 Mbps

                                  * 12.0 Mbps

                                  * 18.0 Mbps

                                  * 24.0 Mbps

                                  * 36.0 Mbps

                                  * 48.0 Mbps

                                  * 54.0 Mbps

                  max # scan SSIDs: 4

                  max scan IEs length: 2257 bytes

                  Coverage class: 0 (up to 0m)

                  Supported Ciphers:

                          * WEP40 (00-0f-ac:1)

                          * WEP104 (00-0f-ac:5)

                          * TKIP (00-0f-ac:2)

                          * CCMP (00-0f-ac:4)

                  Available Antennas: TX 0 RX 0

                  Supported interface modes:

                           * IBSS

                           * managed

                           * AP

                           * AP/VLAN

                           * WDS

                           * monitor

                           * mesh point

                  software interface modes (can always be added):

                           * AP/VLAN

                           * monitor

                  interface combinations are not supported

                  Supported commands:

                           * new_interface

                           * set_interface

                           * new_key

                           * new_beacon

                           * new_station

                           * new_mpath

                           * set_mesh_params

                           * set_bss

                           * authenticate

                           * associate

                           * deauthenticate

                           * disassociate

                           * join_ibss

                           * join_mesh

                           * remain_on_channel

                           * set_tx_bitrate_mask

                           * action

                           * frame_wait_cancel

                           * set_wiphy_netns

                           * set_channel

                           * set_wds_peer

                           * connect

                           * disconnect

                  Supported TX frame types:

                           * IBSS: 0x00 0x10 0x20 0x30 0x40 0x50 0x60 0x70 0x80 0x90 0xa0 0xb0 0xc0 0xd0 0xe0 0xf0

                           * managed: 0x00 0x10 0x20 0x30 0x40 0x50 0x60 0x70 0x80 0x90 0xa0 0xb0 0xc0 0xd0 0xe0 0xf0

                           * AP: 0x00 0x10 0x20 0x30 0x40 0x50 0x60 0x70 0x80 0x90 0xa0 0xb0 0xc0 0xd0 0xe0 0xf0

                           * AP/VLAN: 0x00 0x10 0x20 0x30 0x40 0x50 0x60 0x70 0x80 0x90 0xa0 0xb0 0xc0 0xd0 0xe0 0xf0

                           * mesh point: 0x00 0x10 0x20 0x30 0x40 0x50 0x60 0x70 0x80 0x90 0xa0 0xb0 0xc0 0xd0 0xe0 0xf0

                           * P2P-client: 0x00 0x10 0x20 0x30 0x40 0x50 0x60 0x70 0x80 0x90 0xa0 0xb0 0xc0 0xd0 0xe0 0xf0

                           * P2P-GO: 0x00 0x10 0x20 0x30 0x40 0x50 0x60 0x70 0x80 0x90 0xa0 0xb0 0xc0 0xd0 0xe0 0xf0

                  Supported RX frame types:

                           * IBSS: 0xd0

                           * managed: 0x40 0xd0

                           * AP: 0x00 0x20 0x40 0xa0 0xb0 0xc0 0xd0

                           * AP/VLAN: 0x00 0x20 0x40 0xa0 0xb0 0xc0 0xd0

                           * mesh point: 0xb0 0xc0 0xd0

                           * P2P-client: 0x40 0xd0

                           * P2P-GO: 0x00 0x20 0x40 0xa0 0xb0 0xc0 0xd0

           

          Any ideas?

          • Re: RT3070 wireless adapter adjust tx power??
            shabaz

            In practice the wifi adapter is unlikely to support such a high output (5800mW would require more than 1A at

            5V USB supply) (is this a normal USB stick type of wifi adapter?). 20dBm is more likely though. A a bit odd why it claims 5800mW specifically. Maybe they meant 580mW (which is still really huge for wifi).

              • Re: RT3070 wireless adapter adjust tx power??
                wallarug

                Here is the link to the product:

                http://www.ebay.com/itm/KINAMAX-High-Power-5800mW-802-11b-g-n-150Mbps-Wi-Fi-Wireless-Network-Adapter-/150904547616?ssPageName=ADME:X:RTQ:US:1123

                 

                I know that this is on ebay but I did my background research and every website said 5800mW with 58dBm antenna.

                  • Re: RT3070 wireless adapter adjust tx power??
                    shabaz

                    It sounds like they are relying on a directional antenna which makes sense (no need to radiate a huge power everywhere). So, they are possibly implementing 20dBm output with a 17dBi antenna (this would be extremely directional). It looks like there are antenna topologies for 17dBi for such frequencies, e.g. this one.

                      • Re: RT3070 wireless adapter adjust tx power??
                        wallarug

                        Going on what you said before:

                        In practice the wifi adapter is unlikely to support such a high output (5800mW would require more than 1A at

                        5V USB supply) (is this a normal USB stick type of wifi adapter?). 20dBm is more likely though.

                        I think you are somewhat right.

                         

                        Maybe Linux limits the amount of Watts (current in this case) that you can pull out of the USB port.

                         

                        I did a quick google search:

                        http://en.wikipedia.org/wiki/DBm

                         

                        Have a look at the table halfway down the page:

                        dBm levelPowerNotes
                        80 dBm100 kWTypical transmission power of FM radio station with 50-kilometre (31 mi) range
                        62 dBm1.5 kW = 1,500 WMaximum legal power output of a U.S. ham radio station.[3]
                        60 dBm1 kW = 1,000 WTypical combined radiated RF power of microwave oven elements
                        50 dBm100 WTypical thermal radiation emitted by a human body

                        Typical maximum output RF power from a ham radio HF transceiver

                        40 dBm10 WTypical PLC (Power Line Carrier) transmit power
                        37 dBm5 WTypical maximum output RF power from a handheld ham radio VHF/UHF transceiver
                        36 dBm4 WTypical maximum output power for a Citizens' band radio station (27 MHz) in many countries
                        33 dBm2 WMaximum output from a UMTS/3G mobile phone (Power class 1 mobiles)

                        Maximum output from a GSM850/900 mobile phone

                        30 dBm1 W = 1,000 mWTypical RF leakage from a microwave oven

                        DCS or GSM 1,800/1,900 MHz mobile phone. EIRP IEEE 802.11a (20 MHz-wide channels) in either 5 GHz Subband 2 (5,470–5,725 MHz) provided that transmitters are also IEEE 802.11h-compliant, or U-NII-3 (5,725–5,825 MHz). The former is EU only, the latter is US only.

                        29 dBm794 mW
                        28 dBm631 mW
                        27 dBm500 mWTypical cellular phone transmission power

                        Maximum output from a UMTS/3G mobile phone (Power class 2 mobiles)

                        26 dBm400 mW
                        25 dBm316 mW
                        24 dBm251 mWMaximum output from a UMTS/3G mobile phone (Power class 3 mobiles)

                        1,880–1,900 MHz DECT (250 mW per 1,728 kHz channel). EIRP for Wireless LAN IEEE 802.11a (20 MHz-wide channels) in either the 5 GHz Subband 1 (5,180–5,320 MHz) or U-NII-2 & -W ranges (5,250–5,350 MHz & 5,470–5,725 MHz respectively). The former is EU only, the latter is US only.

                        23 dBm200 mWEIRP for IEEE 802.11n Wireless LAN 40 MHz-wide (5 mW/MHz) channels in 5 GHz subband 4 (5,735–5,835 MHz, US only) or 5 GHz subband 2 (5,470–5,725 MHz, EU only). Also applies to 20 MHz-wide (10 mW/MHz) IEEE 802.11a Wireless LAN in 5 GHz Subband 1 (5,180–5,320 MHz) if also IEEE 802.11h compliant (otherwise only 3 mW/MHz → 60 mW when unable to dynamically adjust transmission power, and only 1.5 mW/MHz → 30 mW when a transmitter also cannot dynamically select frequency).
                        22 dBm158 mW
                        21 dBm125 mWMaximum output from a UMTS/3G mobile phone (Power class 4 mobiles)
                        20 dBm100 mWEIRP for IEEE 802.11b/g Wireless LAN 20 MHz-wide channels in the 2.4 GHz ISM band (5 mW/MHz).

                        Bluetooth Class 1 radio. Maximum output power from unlicensed AM transmitter per U.S. Federal Communications Commission (FCC) rules 15.219.[4]

                        19 dBm79 mW

                         

                        This would give three reasons as to why I can't put more than 20dBm into the device:

                        1) It is sort of illegal

                        2) The maximum normal output of wireless devices is normally only 100mW (20dBm)

                        3) You cannot draw 5.8Watts out of a USB port on the raspberry pi (I think 5volt * 500mW = 2.5W would be the maximum before you need a powered hub or blow it up)

                  • Re: RT3070 wireless adapter adjust tx power??
                    obcd

                    1. You are probably right about this. Even some channels are blocked, depending upon the country settings.

                    2. There do exist high power devices. I have an alpha wifi stick that claims to be high power.

                    It will drain more than the allowed 500mA from your usb port.

                    Most pc's only care about the total current used on all usb ports, so on a pc this can work.

                    Wifi communication is bidirectional. It's useless to have a high power stick if the access point is unable to transmit in high power as well.

                    For some cheap adapters without external antenne, sending more power could extend the usable range a little. High power devices usually will have a good antenna as you don't want the RF radiation to interfer with the surrounding chips.

                      • Re: RT3070 wireless adapter adjust tx power??
                        wallarug

                        NEW QUESTION:

                         

                        Where can I find the db.txt file?

                         

                        This will allow me to change the allowed txpowers for each country.

                        • Re: RT3070 wireless adapter adjust tx power??
                          wallarug

                          This topic has sort of gone dead but...

                           

                          I have found a way that you can stop the Linux OS (using BT5 in a Virtual machine for a start) from limiting tx power...

                           

                          What I want to know though is:

                          1.  Is it telling me the truth that you can put 1.1A@ 5 volts into a Kinamax TS-9900 without blowing it up?

                           

                               NOTES:

                               -  It 'claims' to have a txpower of 5800mW with a 58dBi Antenna.

                               Transmission Power: 5800mW @ 38dBm ± 1dBm - http://forum.lowyat.net/topic/2414082/all

                           

                           

                          2.  What are the signs that it is not copeing with the 1.1A of power?  Fire?  Smoke?  Burning Electronics Smell?  Heat?

                            • Re: RT3070 wireless adapter adjust tx power??
                              mcb1

                              These are very ambitious figures.

                              I doubt its posible to get 58dBi out of that antenna design.

                               

                              I have a 32km wireless link, that has a 24dBi grid pack antenna on the roof, and the TX power is 29dBm, and we are limited to 2MBps, although it probably will do more.

                               

                              With 2.4GHz, interference and close objects can cause the biggest loss of performance, despite the power settings.

                               

                               

                              Mark

                                • Re: RT3070 wireless adapter adjust tx power??
                                  wallarug

                                  Mark,

                                   

                                  I have done tests in windows 7:

                                   

                                  It can see a network about 2.5 km away in a dense populated area with 20 story buildings

                                   

                                  I don't know if that can help work out the max tx power?

                                   

                                  (only used one USB port .: 500 mA draw)

                                    • Re: RT3070 wireless adapter adjust tx power??
                                      shabaz

                                      I'm pretty sure (from the numbers mentioned) the card has 20dBm power output, and the antenna is 17dBi. This would be how they derived their so-called "equivalent" of 5800mW (which is not true). It means if your antenna radiated outward equally, then yes you'd need 5800mW for the same range, but actually on a lower transmit power the antenna is directional and has a 17dBi gain for the same range but no longer in all directions.

                                      I'm not familiar with many antenna topologies, but from a google search it does look like there is a topology that offers 17dBi.

                                        • Re: RT3070 wireless adapter adjust tx power??
                                          wallarug

                                          Then why advertise it has 5800mW 58dBi ???

                                           

                                          Why I first looked at the numbers, they don't add up.

                                           

                                          Here's another catch though...

                                           

                                          It claims range upto 5km.

                                           

                                          http://www.moxa.com/newsletter/connection/2008/03/Figure_out_transmission_distance_from_wireless_device_specs.htm

                                           

                                          Link above explains range of Wireless.

                                           

                                          EDIT: Removed wrong answers.

                                           

                                          I built a python script to do all the hard-work

                                           

                                           

                                          from math import *
                                          while True:
                                              txpower = input('Enter TX Power in dBm value: ')
                                              txgain = input('Enter TX Antenna gain in dBi vaule: ')
                                              rxgain = input('Enter RX Antenna gain in dBi value: ')
                                              rxsensitivity = 81

                                              if txpower >= 50:
                                                  txpower_dBm = 10*log(txpower/1, 10)
                                                  txpower_mW = 10**(txpower_dBm/10)
                                                 
                                              elif txpower <= 50:
                                                  txpower_mW = 10**(txpower/10)
                                                  txpower_dBm = 10*log(txpower_mW/1, 10)

                                              base = 41.88*2442
                                              power = (txpower_dBm+txgain+rxgain+rxsensitivity)/20

                                              top = pow(10, power)

                                              answer = top/base

                                              print " Your Range is about: ", answer, " km!"
                                              print " "

                                          Just put in anything you want to test and it will work it out.  It even converts the txpower to dBm when you put in mW

                                           

                                          Here is a summary of new results using script above:

                                           

                                          ANSWERs:

                                          1. 100mW / 58dBi = 1097.10366882  km!

                                          2. 500mW / 58dBi = 2453.19838186  km!

                                          3. 5800mW / 58dBi = 8355.29261538  km!

                                          4. 100mW / 17dBi = 9.7779467407  km!

                                          5. 500mW / 17dBi = 21.8641535926  km!

                                          100mW / 11dBi ( This is a different adapter I have) = 4.90058207752  km!

                                           

                                          They are assuming that:

                                            i.  RX antenna has gain of 2dBm

                                            ii. RX antenna has constant -81 sesitivity

                                           

                                          The next set of results are using some facts:

                                            i.  Most networks I can pickup have a rx sensitity between -53 to -79 dBm.  So lets pick a number in between: -71

                                            ii.  RX antenna - most corperate networks do not have 2dBm antenna gain  So I will say about 0.5 dBm for internal gain and such.

                                           

                                           

                                          1. 100mW / 58dBi = 291.909122484  km!

                                          2. 500mW / 58dBi = 652.728641126  km!

                                          3. 5800mW / 58dBi = 2223.11364437  km!

                                          4. 100mW / 17dBi = 2.60164279264  km!

                                          5. 500mW / 17dBi = 5.8174501375  km!

                                          100mW / 11dBi ( This is a different adapter I have) = 1.30391015413  km!

                                           

                                          WOW!  Don't those numbers say something  

                                           

                                          I can not pick up signals in Cairns, so that rules out the advertised 5800mW 58dBm

                                          I can't see the 'Federal Parliment Free WiFi', so I guess that rules out 500mW 58dBm

                                          I can't see any of the networks from  Wollongong

                                           

                                          BUT I can see networks with-in a 2 - 4km radius from my house (which is in an undisclosed location).  So I guess that the accual tx power of this device is exactly what you said: 500mW 17dBi .

                                           

                                          I guess one way to test what tx power is going into it will be to cut a USB cable and add a multimeter into the circuit.  I can get around to that later in the week I suppose. 

                                           

                                          Thanks for any advice you gave along the way.  I will let you know how my testing goes in due-course.

                                            • Re: RT3070 wireless adapter adjust tx power??
                                              shabaz

                                              If it is USB powered, then we know it is extremely unlikely that it really has 5800mW power output.

                                              Given that, if you work backward, there is a 'possibility' that they are implying 'range equivalent to 5800mW but just in one direction'.

                                              With that possibility, this means a 20dBm power output followed by a 17dBi antenna. 17dBi antennas do exist (not that I'm any expert in

                                              antenna technology) for WiFi from a google search, so this seemed to add slightly more weight to the possibility. I seem to remember

                                              while back you already confirmed that the device was set to 20dBm in software.

                                              I could be (very likely) totally wrong, but I imagine you'd need to contact the manufacturer to be really sure.

                                               

                                              The fact that they state the digits '58' in both 5800mW and 58dBi sounds like a typo - maybe they meant 38dBi (which is still not the

                                              right way to state things but maybe they were implying a 18dBi antenna which is possibly a rounding up of 17dBi. I'm just playing

                                              with their numbers, which is all anyone can do without further knowledge. It's all speculation, so really you'd need to check with

                                              the manufacturer. Any of their figures could be a typo, leading any conclusion anyone makes to be wrong.

                                              Regarding distance, anything could throw off the real world distances (antenna construction, loss in coax and connector, reflections.

                                                • Re: RT3070 wireless adapter adjust tx power??
                                                  wallarug

                                                  I know that playing with the digits seems like one possiblity of error.  But when I looked at about 10 or so sites, it seemed all of them have it listed as '5800mW 58dBm', which in itself is a contradiction.

                                                   

                                                  I don't know how to contact the manufacturer as they seem to be a ghost company.  Kinamax does not seem to exist unless you want to buy their product from ebay or other store.

                                                   

                                                  The Box I have Specifically states:

                                                   

                                                  5800mW Power and 58dBi antenna

                                                   

                                                  P1030633.JPG

                                                   

                                                  I just looked at the box:  there is a link to a manufacture:  www.antmax.tw

                                                   

                                                  I will look into this site.

                                                    • Re: RT3070 wireless adapter adjust tx power??
                                                      M0DCD

                                                      I'd take these specs with more than a pinch of salt! First of all they are somewhat optimistic in terms of range, you can get a decent link over about 5km "line of sight", that is with no obstructions across clear space. Start to add buildings or any objects in the path and you won't get that. That's on a good day, if it rains, forget it! Possibly in space maybe.

                                                       

                                                      There is of course the matter of licencing of course, these devices are meant to be licence exempt, but there are limits to both output power and ERP.

                                                      Thought we have had our hands on some high powered kit, that is 1W output into a 16dB gain antenna it's been covered by the organisation who's been wanting the link, though here in the UK we've added this to our group licence NoV for this.

                                                       

                                                      5800mW output power is unresonable, there's not a way you'd get that sort of power out of anything off the shelf. As for receiver sensitivity it's not down to background noise levels really, -70dBm would be more realistic. However, there is the point that some access points are set up to ignore weak signals anyway, so your efforts at DX may be in vane.

                                                       

                                                      http://www.element14.com/community/groups/amateur-radio-group/blog/2010/04/25/extreme-wifi

                                                        • Re: RT3070 wireless adapter adjust tx power??
                                                          mcb1

                                                          Cian

                                                          I think you should be able to work out that the manufacturer is not using english as a first language.

                                                          The descriptions are gramatically incorrect for a start.

                                                           

                                                          Your calculations are based on solid reasoning , but the fact still remains that it has to be two way, so even if you were pumping 10kw out, the link wouldn't work.

                                                          just a minor note though ..

                                                           

                                                          The next set of results are using some facts:

                                                            i.  Most networks I can pickup have a rx sensitity between -53 to -79 dBm.  So lets pick a number in between: -71

                                                            ii.  RX antenna - most corperate networks do not have 2dBm antenna gain  So I will say about 0.5 dBm for internal gain and such.

                                                           

                                                          i      this is the Received signal strength at YOUR end.

                                                          II      See below. 3dBi gain isn't unreasonable. You are mixing terms. (dBm which is a measure of power, and gain which is in dB.)

                                                           

                                                           

                                                          The NZ Radio Spectrum Services has some info about maximum radiated (that includes antenna gain) at

                                                          http://www.rsm.govt.nz/cms/licensees/types-of-licence/general-user-licences/short-range-devices

                                                          I'm picking that the Australian equivalent is similar.

                                                           

                                                           

                                                          If you are interested in getting signal from a site, then you should be able to use a suitable device and directional antenna (Antenna gain is compared to a dipole radiating 360deg, and while you can get some gain from the design, its generally because its directional).

                                                           

                                                          My setup uses a 800mW Ubquiti Bullet

                                                          http://www.gowifi.co.nz/wisp-client-radios/ubiquiti-bullet2hp-802.11b/g-800mw-outdoor-ap/bridge.html

                                                           

                                                          24dBi Grid pack antenna

                                                          http://www.gowifi.co.nz/antennas/2.4-ghz/directional/2.4-ghz-24-dbi-die-cast-wireless-grid-antenna.html

                                                           

                                                          The range to the site is 32km, and the Rx signal (at this end) is currently -64dBm (but drops to -74 if the hedge grows).

                                                          The site survey sees a few others, with a noise floor of -97dBm.

                                                          I think -81dBm Rx is a little low, and its quite feasible for the 'site' to use an antenna with 3dB gain. (3dBi)

                                                           

                                                          Obviously with any frequency above about 50MHz its line of site, ie you need to see it.

                                                          2.4 GHz and lower will tend to bounce around off hard surfaces, but they don't really follow the earths curvature, so its approx 11mile (17km), unless you have some elevation.

                                                          Buildings and other materials will attenuate the signal, so careful placement is important.

                                                           

                                                          regarding the USB.

                                                          5v at 500mA gives 2.5 watts.

                                                          I note a 500mW (27dBm) devices with 5dBi antenna is available as a USB device.

                                                           

                                                           

                                                          I think as Shabaz has indicated, that the 5800mW is the eirp (Effective Isotropic Radiated Power) ie the equivalent power required if you had a dipole...

                                                           

                                                          I seem to recall some similar claims about audio power. The marketing department invented this peak power measurement, which of course is a mathmatically anomoly.

                                                          It made the speakers and amplifiers look great though.

                                                           

                                                           

                                                          Mark

                                        • Re: RT3070 wireless adapter adjust tx power??
                                          wallarug

                                          Any idea what any of this means?

                                           

                                          [    2.645344] usb 1-1.3: Product: 802.11 n WLAN

                                          [    2.653229] usb 1-1.3: Manufacturer: Ralink

                                          [    3.753010] udevd[137]: starting version 175

                                          [    5.219718] cfg80211: Calling CRDA to update world regulatory domain

                                          [    6.202215] usb 1-1.3: reset high-speed USB device number 4 using dwc_otg

                                          [    6.483273] ieee80211 phy0: Selected rate control algorithm 'minstrel_ht'

                                          [    6.484945] Registered led device: rt2800usb-phy0::radio

                                          [    6.485093] Registered led device: rt2800usb-phy0::assoc

                                          [    6.485224] Registered led device: rt2800usb-phy0::quality

                                          [    6.485359] usbcore: registered new interface driver rt2800usb

                                          [    8.919891] cfg80211: World regulatory domain updated:

                                          [    8.927372] cfg80211:     (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp)

                                          [    8.935303] cfg80211:     (2402000 KHz - 2472000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)

                                          [    8.942959] cfg80211:     (2457000 KHz - 2482000 KHz @ 20000 KHz), (300 mBi, 2000 mBm)

                                          [    8.950748] cfg80211:     (2474000 KHz - 2494000 KHz @ 20000 KHz), (300 mBi, 2000 mBm)

                                          [    8.958288] cfg80211:     (5170000 KHz - 5250000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)

                                          [    8.966107] cfg80211:     (5735000 KHz - 5835000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)

                                           

                                          ...From startup prompt.  It is stopping /etc/network/interfaces from controlling the card.

                                          • Re: RT3070 wireless adapter adjust tx power??
                                            zerodark

                                            YOU ARE GETTING THE ERROR BECAUSE YOUR COUNTRY SETTING ONLY ALLOW TXPOWER TO BE SET AT THAT LEVEL TO CHANGE TXPOWER YOU NEEED TODO AS FOLLOWS  iw reg set BO ..this change your setting to country Bolivia which allows higher txpower trannsmission .next do iwconfig wlan0 txpower 30 ..then iwconfig wlan0 now you should see that txpower is 30 dbm ..

                                              • Re: RT3070 wireless adapter adjust tx power??
                                                wallarug

                                                zero dark wrote:

                                                 

                                                YOU ARE GETTING THE ERROR BECAUSE YOUR COUNTRY SETTING ONLY ALLOW TXPOWER TO BE SET AT THAT LEVEL TO CHANGE TXPOWER YOU NEEED TODO AS FOLLOWS  iw reg set BO ..this change your setting to country Bolivia which allows higher txpower trannsmission .next do iwconfig wlan0 txpower 30 ..then iwconfig wlan0 now you should see that txpower is 30 dbm ..

                                                If you read the rest of the topic, you would understand that I have established this ages ago.  Please (as I can see you are new here) remember to read the whole topic before posting a reply in capital letters.

                                                 

                                                Last message:

                                                From wallarug:

                                                 

                                                It works great!  I was just interested in the accual power usage.

                                                 

                                                Thanks for all help!

                                                 

                                                Thank you for your reply anyway.