WLAN Problem

clv101 · 7 Aug 2010 at 19:05

So I built a system on the Zotac G41 ITX board recently and all seemed to work. However I'm now have WLAN problems.

My router is the Netgear Wireless-N 300 (WRN2000v2), it's set up 'auto' channel, 'Up to 145 Mbps' and 'WPA2-PSK [AES].

Another desktop with an 802.11g card words fine, as does my n MacBook and Nokia E72 phone. The Zotac Win7 system is not happy though.

Using Vistumbler shows this for the network's SSID:

The neighbours SKY000083 system doesn't show the periodoic drop outs, neither do my other systems show the drop outs on my network (coxway). So what's going on?

clv101 · 8 Aug 2010 at 10:53

No one knows what's causing this?

clv101 · 9 Aug 2010 at 11:46

Clean install on Win7 yesterday, every combination of motherboard/wifi drivers, no improvement... broken board?

clv101 · 10 Aug 2010 at 10:13

The conclusion seems to be that the Zotac's WLAN is just deaf. Using an old Belkin USB dongle everything works fine.

One thought I had, I'm using the E5400 which runs at 2.7GHz stock. The CPU is constantly throttling it's speed between 2-2.2-2.4GHz etc when not under full load. These frequency are the same as the 802.11n spectrum. If there is poor isolation between on-board WLAN and the CPU clock, these throttled frequencies could inject noise to the WLAN receive chain - causing the periodic drop outs seen in the chart above.