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Posted by:simplex0
Subject:Power to dBm : how ?
Date:19:38:14 27/03/2009

> Hey,
>
> We're trying Kismet from Backtrack3 livecd and a Cisco PCCard a/b/g with Atheros chipset inside.
>
> Using Kismet, we can see all the SSID flying around, and when we need more infos about a particular BSSID (pressing key i), we noticed we couldn't get the signal's dBm value, but only a "Power" value.
> On the other hand, the noise looks like to be displayed in dBm value.
>
> What's the formula to get dBm from a Power value ?
>
> Thanks for any help,
>
> Cheers

to convert power in watts to dBm:

P in dBm = 10 * log( Pwatts ) + 30;

Other useful formulas:
P in dB = 10 * log( Pwatts );

Pwatts = 10 ^ ( ( PdBm - 30 ) / 10 ) ; where ^ = to the power of
Pmillwatts = 10 ^ ( PdBm / 10 )


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