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Thread: Alfa awus036nh weak tx power. Is their a way to adjust?

  1. #11
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    Default AW: Alfa awus036nh weak tx power. Is their a way to adjust?

    Have you tried

    Code:
    ifconfig wlanx down
    iw reg set BO
    ifconfig wlanx up
    and check with

    Code:
    iwconfig wlanx
    while wlanx is your Alfa?

    Cheers

  2. #12
    Member skinnypuppy's Avatar
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    Default Re: Alfa awus036nh weak tx power. Is their a way to adjust?

    Just install the latest compat-wireless (http://wireless.kernel.org/download/...-01-17.tar.bz2)

    Follow the guide on the Aircrack-ng forum (http://forum.aircrack-ng.org/index.php?topic=5755.0)
    or this one (http://aircrack-ng.org/doku.php?id=compat-wireless)
    or the one in the forum by muts (http://www.backtrack-linux.org/forum...ight=awus036nh)

    My Alfa Awus036NH on the STOCK BT 4r2 Kernel:


    Code:
    root@bt:~# uname -r
    2.6.35.8
    
    root@bt:~# airmon-ng
    
    
    Interface       Chipset         Driver
    
    wlan0           Ralink RT2870/3070      rt2800usb - [phy1]
    wlan1           Atheros         ath5k - [phy0]
    
    root@bt:~# iwconfig
    lo        no wireless extensions.
    
    eth0      no wireless extensions.
    
    wlan0     IEEE 802.11bgn  ESSID:off/any
              Mode:Managed  Frequency:2.412 GHz  Access Point: Not-Associated
              Tx-Power=20 dBm
              Retry  long limit:7   RTS thr:off   Fragment thr:off
              Encryption key:off
              Power Management:on
    Results of iw list:

    Code:
    Wiphy phy1
            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)]
    I have NO idea where all of this iw reg set BO stuff is coming from to change the power on the 36NH (maybe the 36) but would love to see it because as long as I've had these cards and as many variants of *nix as I run (Gentoo, Slackware) I have never had that command do anything whatsoever.
    Last edited by skinnypuppy; 01-19-2011 at 01:10 PM.
    I may have been born with a silver spoon in my mouth but it does not mean I like to be spoon fed.

  3. #13
    Junior Member laptopz's Avatar
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    Default Re: Alfa awus036nh weak tx power. Is their a way to adjust?

    Changing regulatory domain to Bolivia might not be usefull for a few reasons. 1)Doing that might be illegal in some countries; 2) Driver will most probably override it; 3) AP`s will supply you with regulatory domain and thus force restrictions.

    A few things worth reading:
    http://wireless.kernel.org/en/developers/Regulatory
    http://wireless.kernel.org/en/develo...atory/Database
    http://wireless.kernel.org/en/develo...egulatory/CRDA
    http://wireless.kernel.org/en/develo...ocessing_rules
    Last edited by laptopz; 01-19-2011 at 10:40 PM. Reason: typo
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  4. #14
    Just burned their ISO
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    Default AW: Re: Alfa awus036nh weak tx power. Is their a way to adjust?

    Quote Originally Posted by laptopz View Post
    Changing regulatory domain to Bolivia might not be usefull for a few reasons. 1)Doing that might be illegal in some countries; 2) Driver will most probably override it; 3) AP`s will supply you with regulatory domain and thus force restrictions.

    A few things worth reading:
    http://wireless.kernel.org/en/developers/Regulatory
    http://wireless.kernel.org/en/develo...atory/Database
    http://wireless.kernel.org/en/develo...egulatory/CRDA
    http://wireless.kernel.org/en/develo...ocessing_rules
    Thanks, these links are really worth a read!

  5. #15
    Member joker5bb's Avatar
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    Default Re: AW: Re: Alfa awus036nh weak tx power. Is their a way to adjust?

    you have to override regulatory restrictions
    max txpower is 31dbm on awus036nh
    Last edited by joker5bb; 01-23-2011 at 01:47 PM.

  6. #16
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    Default Re: AW: Re: Alfa awus036nh weak tx power. Is their a way to adjust?

    Quote Originally Posted by joker5bb View Post
    you have to override regulatory restrictions
    max txpower is 31dbm on awus036nh
    is there a howto for overriding reg restrictions that works for the awus036nh cause the jano howto is not working for the 036nh but for 050 nh

  7. #17
    Member skinnypuppy's Avatar
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    Default Re: Alfa awus036nh weak tx power. Is their a way to adjust?

    joker5bb
    Re: AW: Re: Alfa awus036nh weak tx power. Is their a way to adjust?
    you have to override regulatory restrictions
    max txpower is 31dbm on awus036nh
    Really?!? Show me how. Upload a screenshot of your alfa awus036nh at txpower 31: iw config , iw list, kernel you are running on, etc.. without doing the questionable iw reg set BO nonsense. I would love to see it......

    I've already gone over how to set txpower to 20 in another post, just because it is advertised at 2000mw doesn't mean you are going to get it with the rt2800usb driver or any driver for that matter. Search the net, there is a whole bunch of hits pertaining to the topic of the awus036nh and linux and power adjustment.
    Last edited by skinnypuppy; 01-23-2011 at 06:34 PM.
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  8. #18
    Member joker5bb's Avatar
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    Default Re: Alfa awus036nh weak tx power. Is their a way to adjust?

    screenshot from Ubuntu, but same result in Backtrack


    here is my awus036nh modded with a heatsink (I am going to build a custom case for it):

    that coax cable leads to a 15dbi directional antenna, I also have 9dbi omnidirectional antenna

    I am going to test the power on the oscilloscope
    Last edited by joker5bb; 01-24-2011 at 02:36 PM.

  9. #19
    Member skinnypuppy's Avatar
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    Default Re: Alfa awus036nh weak tx power. Is their a way to adjust?

    @ joker5bb: Got it to finally hit 30 30dbm! Let me know how the test on the oscilloscope goes, I'd be interested to see if there is a significant difference from the 20dbm to 30dbm. Thanks for the inspiration to push on and get this card to due what it is supposed to do.
    I may have been born with a silver spoon in my mouth but it does not mean I like to be spoon fed.

  10. #20
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    Default Re: Alfa awus036nh weak tx power. Is their a way to adjust?

    The commands i used to get 30dbm i used are below, not sure if this will help people who can only get 4dbm or similar. Im using Bt4 r2, this method worked on VmWare and a USB drive.

    Code:
    mkdir/usr/src/drivers
    
    wget http://wireless.kernel.org/download/compat-wireless-2.6/compat-wireless-2011-01-17.tar.bz2
    
    tar jxvf compat-wireless-2011-01-17.tar.bz2
    
    cd compat-wireless-2011-01-17
    
    wget http://patches.aircrack-ng.org/mac80211_2.6.32.2-wl_frag+ack_radiotap.patch
    
     wget http://patches.aircrack-ng.org/channel-negative-one-maxim.patch
    
     $ patch -p1 < mac80211.compat08082009.wl_frag+ack_v1.patch
     
     $ patch -p1 < channel-negative-one-maxim.patch
    
    ./scripts/driver-select rt2x00
    
    make
    (will take ages)
    
    make install
    
    make unload
    
    modprobe rt2800usb
    
    iw reg set BO
    
    airmon-ng wlan0
    
    iwconfig (should be 30Dmb)

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