Date: Sat, 25 Feb 2012 15:45:13 +0200 From: Jakob Pedersen <jakobp78@gmail.com> To: Adrian Chadd <adrian@freebsd.org> Cc: mobile@freebsd.org, wireless@freebsd.org Subject: Re: Problems with RaLink rt61pci/rt2561 wifi card Message-ID: <CAEKTEhQ5SrV6Bud0CcEnsW9JqXuPsFK6EW58fqjtsYyApmC-7Q@mail.gmail.com> In-Reply-To: <CAJ-Vmo=jR_1Ot6kMZ-RBX32p_w8pwB%2Bf5qC38S3u_UZ0Q%2BeY8w@mail.gmail.com> References: <CAEKTEhR2KWxBwF6YBK4AS=J27Yb53zeUpHF%2BKCnKUM0s8wK-jA@mail.gmail.com> <CAJ-Vmo=jR_1Ot6kMZ-RBX32p_w8pwB%2Bf5qC38S3u_UZ0Q%2BeY8w@mail.gmail.com>
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Hi Adrian, Thank you for the tips for diagnosing my WiFi issue. It seems to be the gain settings on the wifi card somehow (I am in not much of a technical person, but at least that's what it seems to me). For PC-BSD the signal strength is measured to -54 dB just next to the router and when stepping away like 5 - 6 metres the signal is lost at -95 dB (Same level as noise dB level). The decrease in not sudden but drops gradually when distance to router is being increased. I am dual booting Arch linux on the same laptop, where WiFi works fine and it measures - 20 dBm next to the router and - 70 dBm where PC-BSD looses connection. Not really sure, what to do from here though.. But thanks, anyway! Jakob On Wed, Feb 15, 2012 at 8:09 AM, Adrian Chadd <adrian@freebsd.org> wrote: > Hi, > > It sounds like it could be: > > * low TX power from your device; > * Really bad RX gain settings somehow; > * other fruity radio related stuff. > > The trouble is going to be diagnosing it. What I do in these instances > is use a known-good setup (i have a bunch of laptops with AR9280's in > them for this reason) to use in monitor mode - I can then get a rough > estimate of TX power by just sniffing the frames your device is > sending. > > That'd hopefully identify whether it's a TX or an RX problem. > > If the device works in monitor mode, you could try that: > > tcpdump -ni wlan0 -y IEEE802_11_RADIO > > Connect, then walk away from the AP. See if the RX RSSI fields in the > tcpdump drop suddenly. If you get a few metres away and you're still > receiving things strong, it may be a TX issue. If you suddenly stop > hearing anything, it's likely an RX issue. > > Good luck! > > > Adrian >
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