From owner-freebsd-wireless@FreeBSD.ORG Tue Apr 10 05:24:16 2012 Return-Path: Delivered-To: freebsd-wireless@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 9B5BF106564A; Tue, 10 Apr 2012 05:24:16 +0000 (UTC) (envelope-from kob6558@gmail.com) Received: from mail-we0-f182.google.com (mail-we0-f182.google.com [74.125.82.182]) by mx1.freebsd.org (Postfix) with ESMTP id C06F58FC16; Tue, 10 Apr 2012 05:24:15 +0000 (UTC) Received: by wern13 with SMTP id n13so3956243wer.13 for ; Mon, 09 Apr 2012 22:24:15 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type:content-transfer-encoding; bh=jDF39y1fPAYhu8GWItZG6hAf2hUa17Dra6crub4d1A8=; b=Dak5zvdwCfFHD3554nUH5+vy5X25z+LvPDvFkJiyN22rnVJAksn4x7RturBAYRaxOj UrkZ6pQ+wwJ3E8JswJoFW6L6nGDCANwfq9mkaAQwJ0DHdlLth5oyy8Xhwv6WLzxjd+Sw mCc1bE5lshY9Vepws4JIQgApPARwFsZ6ClrfI1BpfWXwOJvXXdgDzUlYKx8jWb8awBxX xTHcV+wbsS5rjanW8SVi54I1uR3qeOqd8yLUTUciJPdlydQyzrJvQjS2A0KHIOycxXMD X+7uyUwrFVWGuS/Yrqoh1FJ1pAVRCEfZH/ztrFJcRre4xt9LfUXxUscRs2D8ypjEK6pC nOXA== MIME-Version: 1.0 Received: by 10.216.135.223 with SMTP id u73mr5336265wei.117.1334035454918; Mon, 09 Apr 2012 22:24:14 -0700 (PDT) Received: by 10.223.54.207 with HTTP; Mon, 9 Apr 2012 22:24:14 -0700 (PDT) In-Reply-To: <5110227587.20120409232613@serebryakov.spb.ru> References: <165226504.20120408192539@serebryakov.spb.ru> <1322303419.20120408233657@serebryakov.spb.ru> <1353140683.20120409123158@serebryakov.spb.ru> <5110227587.20120409232613@serebryakov.spb.ru> Date: Mon, 9 Apr 2012 22:24:14 -0700 Message-ID: From: Kevin Oberman To: Lev Serebryakov Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Cc: freebsd-wireless@freebsd.org Subject: Re: request for testing: please test -head ath 11n stuff X-BeenThere: freebsd-wireless@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: "Discussions of 802.11 stack, tools device driver development." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 10 Apr 2012 05:24:16 -0000 On Mon, Apr 9, 2012 at 12:26 PM, Lev Serebryakov wrote: > Hello, Adrian. > You wrote 9 =D0=B0=D0=BF=D1=80=D0=B5=D0=BB=D1=8F 2012 =D0=B3., 22:30:14: > >> Does that fancy bit of equipment work in some kind of spectrum >> analyser mode? I wonder what _kind_ of signal you're seeing. > =C2=A0It works only in spectrum analyzer mode (it doesn't know anything > about WiFi & Ko, all WiFi-related "annotating" info is extracted from > regular WiFi adapter), and it shows very limited in bandwidth (exactly > channel 6-centered 802.11g transmission, with almost no signal outside > this band) very strong (-10 -- -15 dBi) signal, when my AP was > detected as -40 dBi (when my AP is on channel 1 and transmitting, it > becomes strongest signal on this channel, so it could be easily seen > at spectorgram). This channel is occuped by 4 or 5 different hotspots > according to WiFi card, but all of them have very low RSSI. > > =C2=A0It think, it could be surveillance / security camera with non-WiFi > 2.4 Ghs transmitter, as signal is very uniform -- when WiFi AP or > client are transmitting here are some regular spots without signal on > spectorgram and some variance in signal strength, but this signal is > very stable, without pauses or any significant variation. > > =C2=A0Unfortunately, I didn't take any screenshots, and this card was at = my > home only for 3 hours :) I suspect that the camera is the culprit. Back about 8 or 9 years ago I was working on the network at the SuperComputing show and a booth was using a wireless camera on the 4.2 band. It totally wiped out WiFi all around that booth. Fortunately, the contract signed by exhibitors gave the show authority over all wireless and the camera was turned off. --=20 R. Kevin Oberman, Network Engineer E-mail: kob6558@gmail.com