Date: Thu, 27 May 2010 00:25:40 +0200 From: Miroslav Chlastak <mira@chlastak.cz> To: freebsd-mobile@freebsd.org Subject: Atheros and how to convert RSSI to dBm Message-ID: <4BFD9FE4.3090309@chlastak.cz>
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Hello, is there a way how to convert RSSI from output of "ifconfig ath0 list sta" to dBm?: [snip] 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 [snip] I my test enviroment I use this function: noise floor + RSSI*2 = signal of client in dBm Then i get the same value as from "tcpdump -n -i ath0 -p -y IEEE802_11_RADIO": [snip] 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 [snip] Right? Or is this conversion "stupid"? Some better idea? Is there a way how to get noise floor via "ifconfig"? I get it from output of "athstats" :( -- Mira
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