Re: TX power

From: Jouni Malinen (
Date: 2002-08-19 16:13:34 UTC

On Fri, Aug 16, 2002 at 09:50:27PM -0300, Pablo Berra wrote:

> I am using Senao 23dBm cards, and the iwpriv report me "TX power: 20dBm".
> Is it true?

No, that value is not really on any exact scale.. 20 dBm just happens to be the maximum (no matter what the real wlan card max TX power is) and -43 dBm minimum. This range is mapped to TX power setting and it might even be logarithmic on some card models, but this is not necessarily the case..

> If I try to change with the "iwconfig wlan# txpower <arg>" to some other value, does something really happen?

On all Prism2 models that I have tested, this have had some effect on the TX power.. Smaller values use less power and higher more (how suprising ;-), but other than that I would not trust the values. In addition, using the maximum value might not provide best possible signal quality.. I have used this mostly to lower the TX power to limit range and amount of noise or unwanted frames in my test setups.

Jouni Malinen                                            PGP id EFC895FA

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