Re: Problems with RaLink rt61pci/rt2561 wifi card

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 <[email protected]> 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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