On 5.3.2010 20:24 Luis R. Rodriguez wrote: > txpower is the only command left to add to iw to be able to tell > people to drop iwconfig completely. I was going to do it but have > other things to take care of right now. If someone can take over > that'd be nice. Attached is what I had left.
I was looking at the TX power setting recently. However, before adding the userspace bits I need to fix the low level stuff so that the real TX power matches what is set via iwconfig. I did some measurements with a spectrum analyzer and two miniPCI cards (AR5414 and AR5212) in 5GHz band and the results are not very good. On AR5414 the measured value was 9 dB lower than the one set in iwconfig, while on AR5212 it was 2 dB higher. However I'm quite sceptical about the results, because even for Madwifi the values weren't what they should be (8dB lower). So now I'm waiting for an access to a newer spectrum analyzer which can measure full 20MHz channel, I should have it in a month or so. The only thing I know for sure now is that there's some difference between Ath5k and Madwifi and probably Madwifi is more correct, because I got roughly the same results for both cards there. > You'll have to distinguish between fixed power or not, some cards do > cannot support actually setting the txpower at a specific level and > guarantee that it will be used, so it would only use it as a max > power. I think intel cards have this restriction. I think there should be another parameter to enable/disable TPC (it was possible with Madwifi, I think). Lukas Turek
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