Thread: Analyzing and optimizing paralyzing WLAN connection

At times, wireless networks seem to be leading their own lives: sometimes things function exactly as they should, and sometimes the connection to the PC gets cut or is extremely slow.

If your Wi-Fi network functions at least from time to time, we can assume that the basic configuration is set correctly. The problems described can be due to a poor radio connection, which could be additionally hindered due to the adjacent WLANs of your neighbors. In such a case, you should first get an idea about the current radio environment.

The free toolNetStumbler is quite old but still effective, and can help you for Windows XP. The more recent version Vistumbler will help you for Vista. The analysis method and the operation of both tools are very similar to each other. Hence, we will describe the process taking Vistumbler as the example.

Analysis: Activate your WLAN adapter, install the program and start it. After clicking the 'Search' button, the tool traces all radio networks in the vicinity. You can locate your own WLAN with the help of the network name (SSID). The 'Channel' column will give you the frequency band at which it transmits¬and the channels on which other WLANs are active. You must be at least five channels away from each other so that radio networks do not disturb each other . However, since there are a maximum of 13 channels in the 2.4 GHz band, the probability of this being possible is rather small, especially in apartment buildings.

Nevertheless, the situation can be improved in most cases.
Optimization: Check which of the neighboring WLANs affect your WLAN the most in the 'Signal' column. Try to find a channel that is not in use and adjust your router such that it transmits through the neighboring WLANs.
In the next step, test the position and alignment of the notebook or PC as well as of the antenna(s) of the router. For this, select you radio network in the list and click 'Graph; Now change the position or alignment of the notebook or PC and observe the signal strength when doing so. Often, it is sufficient to turn the computer to considerably improve the signal strength.

Also try to find an optimal position for the router: it should be positioned as high as possible and not be placed behind the computer.