3 messages in org.freebsd.freebsd-mobileAtheros - txpower - Compex WLM54AG + ...| From | Sent On | Attachments |
|---|---|---|
| Johann Hugo | Feb 14, 2007 1:59 pm | |
| Sam Leffler | Feb 14, 2007 5:09 pm | |
| Johann Hugo | Feb 15, 2007 12:26 pm |
| Subject: | Atheros - txpower - Compex WLM54AG + WLM54AG-23 | |
|---|---|---|
| From: | Johann Hugo (jhu...@meraka.csir.co.za) | |
| Date: | Feb 15, 2007 12:26:15 pm | |
| List: | org.freebsd.freebsd-mobile | |
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