This gives them a larger transmission area, but also makes them more susceptible to interference from adjacent channels – and these networks are probably quite unstable. In addition, we see that Whitemouse and Langestolen are much wider than the other networks, this means that they are running 40 MHz mode on their routers to get higher speeds. Noise on adjacent channels is worse than noise on the same channel for Wi-Fi equipment, and the experience is probably better for everyone if they also adhere to channels 1, 6 and 11. With such noise from others, there is little we can do, except maybe ask the neighbor nicely if they can change the channel for their network – or hope that they read this article! This is called "adjacent channel interference", interference from surrounding channels. They do not use channels 1, 6, or 11, and they therefore interfere with multiple channels simultaneously. Interference on other channelsĪnother challenge comes from the networks Mr Orange, Langestolen, WhiteMouse, SAAB and Telenor2105sot. The Wi-Fi standard addresses this, making the networks have to try to adapt to each other, almost like driving in a queue. This is what is called "co-channel interference" – networks on the same channels that interfere with each other. Most networks here are clustered around channels 1, 6, and 11. Ideally, this would be the only wireless network in the area, but this is of course quite a far-fetched idea these days.
In this example we see that there are many wireless networks on the 2.4 GHz frequency band.ĪirTies_Air4920_EI78 is our network in this example. The picture below shows a scan done in a regular neighborhood with the program inSSIDer.
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More about wireless signal strength can be read here: Wi-Fi Signal Strength: What Is a Good Signal And How Do You Measure It? Example: How to Assess Interference and Select a Channel But if you have multiple access points, they can be placed to cover different areas. In practice, this will be virtually impossible to achieve everywhere in an apartment or a house if you only have a single access point (usually the router). If there are other wireless networks on the same channel, try selecting a channel where the other wireless network's signal is 20 dBm weaker than your wireless signal is. You should also look at the signal strength of each network. See also: Five questions to ask when your phone does not find Wi-Fi.
It is common to adhere to these three channels, although in Norway you can theoretically use all channels from 1 to 13. We recommend sticking to channels 1, 6 or 11 with 2.4 GHz to achieve the best stability, and for all devices to be able to find the wireless network regardless where and when they were manufactured. Two rules of thumb for channel selection on the 2.4 GHz bandĪs far as possible, you do not want other access points nearby that use the same channel. Follow the instructions provided by the supplier for your router/access point – how to proceed varies from product to product. If you see that your own network is on the same channel as many neighboring networks, you can change your setup by accessing the settings for your router or other wireless access point and changing the channel there. When you see which channels are being used by other networks, you can change the channel on your own network to reduce interference, primarily on the 2.4 GHz band, where interference and overlap are causing the most problems.
What Do You Do with the Results of a Wi-Fi Scan? How to Use the AirPort App for iOS as a Wi-Fi Scanner
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It is quite costly, but a simpler, free version exists for Windows.įree Wi-Fi scanners are available for most platforms.
In the example below we use the application inSSIDer. You can find more information about that here: Map your wireless network with a heat mapper. However, if you are looking to measure coverage and signal strength for your own network, you will have more benefit from using a heat mapper. For this, also see further advice in Five questions to ask when your phone does not find Wi-Fi Mobiles, computers, or other devices that can't find the network.Slow or unstable wireless connections in your home.
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