Sunday, January 17, 2010

Change country CRDA of ALFA-­AWUS036H version 500mW/1.000mW with RTL8187/Stacks-­mac­80211

- Editing and creating files described, must be done carefully.
- Check the difference in formatting characters (quotes '' “­­) when you copy&paste.
- Tested on Ubuntu Jaunty with Kernel 2.6.28-17-generic (not tested on Ubuntu Karmic or Kernel above 2.6.28)
­- The frequency of 5.0 GHz is not supported by chipset used by this model of ALFA card.

With mac­80211 drivers the limit of EIRP is set automatically by CRDA, for set/increase the full TX power You can choose only one of these two different options to change your default Country.

Shortcuts for set automatically CRDA and enables to 2.4 GHz and 5.0 GHz of 30 dBm with one command line
­- If you use more than one wireless card is convenient to change automatically the CRDA when you need and only for your ALFA card.
­- To simplify and not permanently change the default data, I suggest using this method:

Create new file:

sudo gedit /usr/local/bin/crda_change
Copy&paste this text:

sudo modprobe rtl8187
sleep 2
sudo iw reg set BO
Make file executable:

sudo chmod +x /usr/local/bin/crda_change
Create new alias:

printf "alias boost=\'sudo /usr/local/bin/crda_change'\n" | tee ­a ~/.bashrc
- Now if you want load the driver RTL8187 in your modules and change automatically the CRDA use only new one "boost" command:

Option to automate the modification of the CRDA, and put in "UP" mode your ALFA­-AWUS036H when you plugged in to USB port.

Create the file "crda_change" as described in previous step called ­­--> FIRST OPTION ­
Create this file: (or edit if it already exists)

sudo gedit /etc/udev/rules.d/80­programs.rules
Copy&paste this text:

SUBSYSTEMS=="usb", SYSFS{idVendor}=="0bda", SYSFS{idProduct}=="8187", RUN+="/usr/local/bin/crda_change"­
- Now, when you connected your wifi card into USB port, the scrip will perform all operations.

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