I bet there's some RF leaking out, either from the TX, or maybe the PLL/clock.
Unfortunately it's the kind of thing you can only diagnose with a sensitive spectrum analyser. I had that problem with a box w/ two (high powered) NICs in 2ghz mode, and I only discovered this issue with a spectrum analyser. I found that there was enough RF leaking in/out of the u.fl connectors and (cheap) cable that it started counting as interference. Silly, but true. :) Adrian On 31 July 2011 09:04, Mihai Moldovan <io...@ionic.de> wrote: > * On 31.07.2011 01:41 AM, Grant wrote: >> It's fixed! The problem was actually interference from an ath5k >> 802.11g card I had in the same system. I've noticed that any wireless >> card installed in the system will pump out enough RF to interfere with >> any other card in the system even if the interfering card's drivers >> are compiled out of the kernel. > > I've had similar problems before, sorry. More specifically, I've been > using 2 ath9k operated cards in one system and my STAs were able to > connect for a short time, but were as well disconnected after at most 5 > minutes. Another fact aggravating this problem was using the same SSID > for both AP mode cards. > > I suspect using two cards on the same base frequency (i.e. 2GHz) in the > same system (or even in the same range) is a bad thing to do, even if > the channels themselves are not overlapping. > > On the other hand, my current setup involves 2 ath9k driven cards, each > with separate SSIDs and on different base frequencies (2GHz and 5GHz) > which doesn't show any of these problems and indeed is running fine, > from what I can tell. > > Every now and then my laptop will "disconnect" from the network and any > connection time out until I manually tell the system to reconnect to the > network or cycle the WLAN card's power (thus forcing a reconnect), but > I'm not entirely sure what's causing it, as I'm not getting any errors > on either my STA (which, granted, is an OS X system and I don't even > know where Apple would log wireless errors but via syslog or in the > Kernel log ring buffer, no one showing any error traces though) or my > AP. Weirdly it does only seem to happen when streaming a video file over > NFS, so I'm reluctant to blame it on the 2 cards setup. :) > > Best regards, > > > Mihai > > > _______________________________________________ > ath9k-devel mailing list > ath9k-devel@lists.ath9k.org > https://lists.ath9k.org/mailman/listinfo/ath9k-devel > > _______________________________________________ ath9k-devel mailing list ath9k-devel@lists.ath9k.org https://lists.ath9k.org/mailman/listinfo/ath9k-devel
