Date: Thu, 15 Feb 2007 14:26:28 +0200 From: Johann Hugo <jhugo@meraka.csir.co.za> To: Sam Leffler <sam@errno.com> Cc: mobile@freebsd.org Subject: Re: Atheros - txpower - Compex WLM54AG + WLM54AG-23 Message-ID: <200702151426.28877.jhugo@meraka.csir.co.za> In-Reply-To: <45D34239.5070304@errno.com> References: <200702141529.23439.jhugo@meraka.csir.co.za> <45D34239.5070304@errno.com>
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On Wednesday 14 February 2007 19:09, Sam Leffler wrote: > Johann Hugo wrote: > > I'm busy testing two wifi cards from Compex under FreeBSD 6.2-STABLE. The > > WLM54AG card has a max txpower of 20dBm and the WLM54AG-23 has a max > > txpower of 23dBm. > > http://www.compex.com.sg/home/Datasheet/New_WLM_DSv1.9.pdf > > > > The problem is that both cards produces the same RSSI value on my remote > > station a couple of km's away from my test setup. If I do the same test > > with the same cards under Ubuntu 6.06 then the WLM54AG-23 produces a > > bigger RSSI value on my remote station than the WLM54AG card. > > Beware that rssi isn't necessarily indicative of tx power. If you don't > put the cards on a spectrum analyzer or power meter you're just guessing. I'll try to get my hands on a SA or power meter. > > > Under FreeBSD, with a country code of 710 the max txpower can only go > > up-to 32 (16dbm) on both cards and vith a country code of 0 they can go > > upto 36 (18dbm). Under Ubunti I can set the max txpower of the WLM54AG > > card to 20dBm and the WLM54AG-23 card to 23dBm. > > Where do you get these numbers? These are the reported values from ifconfig / iwconfig > There was a hal bug I recently fixed > where the _reported_ max tx power obtained from the calibration data was > wrong. Note that is REPORTED, the actual max tx power cap was correct > and you should see that measuring with a SA or power meter. The Ubuntu drivers comes from Compex (when I first reported the problem with them) with an old HAL 0.9.16.16 I think. On FreeBSD I'm using 0.9.20.3 > > I'm not to sure if this is the right place to post my problem, or whether > > I should rather try the MadWifi list or the manufacturer of the cards > > itself, but it feels like it's related to FreeBSD. > > It is unclear what is going on but there have been no hal changes that > would affect operation and/or cause operation to be different between > madwifi and freebsd. I suggest you measure things properly and then > come back to me. Will do. Johann
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