Date: Thu, 27 May 2010 01:16:55 +0100 From: Rui Paulo <rpaulo@FreeBSD.org> To: Miroslav Chlastak <mira@chlastak.cz> Cc: freebsd-mobile@freebsd.org Subject: Re: Atheros and how to convert RSSI to dBm Message-ID: <BFBFCF99-8D2E-43BB-98DA-2B681C99514D@FreeBSD.org> In-Reply-To: <4BFD9FE4.3090309@chlastak.cz> References: <4BFD9FE4.3090309@chlastak.cz>
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On 26 May 2010, at 23:25, Miroslav Chlastak wrote: > Hello, >=20 > is there a way how to convert RSSI from output of "ifconfig ath0 list = sta" to dBm?: >=20 > [snip] >=20 > ADDR AID CHAN RATE RSSI IDLE TXSEQ RXSEQ CAPS FLAG > 00:4f:62:1d:d8:5d 14 9 11M 18.5 0 15932 22400 ES A >=20 > [snip] >=20 > I my test enviroment I use this function: > noise floor + RSSI*2 =3D signal of client in dBm >=20 > Then i get the same value as from "tcpdump -n -i ath0 -p -y = IEEE802_11_RADIO": >=20 > [snip] >=20 > 10:41:04.746395 86402611933us tsft short preamble 58.5 Mb/s -61dB = signal -98dB noise antenna 1 [0x00000012] IP 10.0.0.1.2049 > = 192.168.100.2.123: NTPv3, Client, length 48 >=20 > [snip] >=20 >=20 > Right? Or is this conversion "stupid"? Some better idea? >=20 > Is there a way how to get noise floor via "ifconfig"? I get it from = output of "athstats" :( No, there's no way right now. Check this: = http://lists.freebsd.org/pipermail/freebsd-stable/2006-September/028895.ht= ml Regards, -- Rui Paulo
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