On 19 February 2013 11:11, Georgiewskiy Yuriy <bottleman@xxxxxxxxxx> wrote: > > hm, i have signal jumps too on some cards, but it's may be a hardware problem, > in one of my case this confirmed by manufacturer, then hi block 2.4 bands on it > where problem occurses, and continue sell it as 5Ggz only card. and i have NF > calibration jumps on this card too, it easy to se just enable calibration debug > (echo 0x00000008 > /sys/kernel/debug/ieee80211/phy0/ath9k/debug) and watch on > log with tail -f, you sould se something like this, may be periodicaly: > > 6.505180] ath: phy0: NF calibrated [ctl] [chain 0] is -68 > 6.505185] ath: phy0: NF[0] (-68) > MAX (-97), correcting to MAX > 6.505188] ath: phy0: NF calibrated [ctl] [chain 1] is -80 > 6.505191] ath: phy0: NF[1] (-80) > MAX (-97), correcting to MAX > 6.505194] ath: phy0: NF calibrated [ext] [chain 0] is -70 > 6.505197] ath: phy0: NF[3] (-70) > MAX (-97), correcting to MAX > 6.505200] ath: phy0: NF calibrated [ext] [chain 1] is -80 > 6.505204] ath: phy0: NF[4] (-80) > MAX (-97), correcting to MAX Yes. I've seen cards that do this. It's almost always due to badly placed components/tracks causing spurs / resonance to show up in the 2GHz bands. It makes the NIC unusable in those modes. Adrian -- To unsubscribe from this list: send the line "unsubscribe linux-wireless" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
