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Old 02-01-2011, 02:55 PM   #1
whytek
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Registered: Dec 2010
Distribution: Slackware
Posts: 9

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rtl8187 + awus036n + turn DOWN txpower ?


Hi all, here's a question, maybe for anyone who understands programming the awus036H. (sorry, not N as i typo-ed in the thread title)



With the rtl8187 driver from kernel 2.6.33.4 and an awus036h (genuine) - the 1W version, I am finding that iwconfig txpower has no effect. I suspected this was the case, so I ran the folliwing proving test:

I ran a monitor with another card, (using airodump-ng)
I then ran a ping flood (ping -f) on the router to get a lot of packets going and monitored the STATION PWR being reported by airodump-ng

As I moved the awus towards and away from the monitoring card, I see major changes in the PWR levels being reported. this proves the number reflect the strength of signal being received.

Then I placed the awus as far away from the internal card as the usb cable will allow, and the PWR reported settles at around -30

Now I open another terminal and run iwconfig wlan1 txpower 0,1,2.. etc up to 27. There is no change whatsoever in the PWR levels being reported by airodump-ng.

I can only conclude that things are as I suspected, that the txpower setting is having no effect.

Now, I know most people want to fry everything by turning UP the power on the card, the net is full of posts about overriding the regional restrictions and all that, but I want to turn the power DOWN to the minimum necessary for communication with the AP.

Any words of wisdom are most welcome


thanks!


k


EDIT: I should add that after running iwconfig txpower for each setting, iwconfig or iwlist subsequently reports that the power has changed, but the observations of the test above show otherwise.

Last edited by whytek; 02-01-2011 at 03:26 PM.
 
  


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