What is the max power for my card?

wlan wlan at zaragozawireless.org
Sun Jan 19 21:11:47 EST 2003

On Sun, 2003-01-19 at 17:30, Jouni Malinen wrote:
> On Sun, Jan 19, 2003 at 01:12:53AM -0800, wireless at douglasheld.net wrote:
> > The documentation online for this card is unclear; I wonder if I can use
> > iwconfig to query the maximum power setting?
> No, Host AP driver has no way of knowing the real maximum transmit power.

Hostap is the only driver that it is not able to know the maximum
transmit power, or it is common missing feature of all linux drivers?

> > Currently, iwconfig accepts ridiculously large values, like 300mW, without
> > complaint.
> Everything over 20 dBm / 100 mW is interpreted as the maximum value for
> the card. In other words, setting it to 300 mW or 200 mW configures the
> card exactly in the same way as using 100 mW.

So i understand that this behaviour is due to the reason than we don't
know the maximum value, in such a case won't be better to use
percentages and change iwconfig man page?

iwconfig eth0 txpower 100% 
iwconfig eth0 txpower 25%


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