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Just my unofficial thoughts but I see this often on wireless network cards. I think it has to do more with the refresh rate of your WLAN info screen.
Lets say the screen refresh on the WLAN info screen is 3 seconds, meaning every three seconds you see an update as to what channel it appears to be searching. Now assume that the network card scans each channel every second. Out of twelve channels it would only APPEAR to be searching 4 channels but really it is searching all of them, you're just not seeing each one because the screen is not refreshing each second.
Since I'm just guessing at the refresh and scan times it could be that maybe the refresh is 4 seconds and you're only seeing 3 channels. Or maybe it's 2.5 seconds and now it appears to be randomly scanning channels, etc. I don't know, but that's how I always figured it worked because it doesn't make sense for the card to scan whatever channels it feels like scanning - it should be scanning them all. Whether you're seeing them being scanned or not is the question.
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Dell Axim X30
Inspiron 8600 1.7Ghz Centrino
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