On 5.3.2010 23:43 Bob Copeland wrote: > If you have access to the kind of R&S analyzer used here, please share :) > http://bugzilla.kernel.org/show_bug.cgi?id=14566 I think this happens because the card switches output connectors (miniPCI cards have two antenna connectors). We had this problem even in FreeBSD and had to set a fixed TX antenna.
I hit this too when I did the measurement and had the pigtail connected to the wrong connector. There is currently no TX antenna setting in Ath5k, so I had to hardcode it in the call to ath5k_hw_set_antenna_mode(). Before I did that, the output power was really aproximately 20 dB lower. Unfortunately I didn't write the value down, but I think it was -13 dBm instead of 11 dBm. I don't understand yet why the hardware chooses to swap antennas from time to time. Maybe it in fact works OK in normal situation, but it gets confused when it's hooked to a spectrum analyzer and didn't receive any packets. 8AN
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