How to Jam the Network

To jam the network, you need to transmit the radio signal on the same frequency to overwhelm the original signal. Jammers broadcast multiple frequencies at once over a wide range of waves and can disrupt everything from police radars to GPS systems, making it illegal in many countries. Instead, you can use a Wi-Fi router to broadcast some frequencies on a narrower range. You’d better adjust your settings individually to limit interference and not upset your neighbors.

Table of Contents

Network interference

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Use jammers if legal. Many countries ban the use of jammers, including the US. ^{[1] X Trusted Source Federal Communications Commission Go to Source} If your current location allows it, all you need to do is buy the device, turn it on, and bring it close to the source of the network that needs interference. However, in most areas, you will need to use the following more complex and legal compliance approach. Or you can continue reading below for a legal way to prevent your neighbors from stealing Wi-Fi, and at the same time limit the impact of nearby signals on your home network.

Network interference can affect emergency radio communications, as well as other critical transmissions. Even if this is legal where you live, it’s still best to limit the use of jammers in densely populated areas.
Don’t make the mistake of thinking that jammers are legitimate just because you see someone around selling. These sellers may be breaking the law.

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Specify the frequency at which you want to jam. Assuming jammers are allowed, you’ll need to take a more targeted approach. Each Wi-Fi device emits a signal at one or more frequencies. To overwhelm this signal, you need to send a signal at an analog frequency. Find out the name of the device you want to jam, or apply the method below to the Wi-Fi frequency: ^{[2] X Research Source}

An 802.11b or 802.11g Wi-Fi router will emit a signal at the 2.4GHz frequency. This is a safe option if you cannot determine the router frequency.
802.11a WiFi routers will emit a signal at the frequency of 5GHz.
The 802.11n standard works at 2.4 or 5GHz signals. You may need to jam both of these frequencies. Some modern routers to this standard can automatically tune to the frequency, making it harder to cause interference. ^{[3] X Research Sources}
If you can’t determine your current router type, try downloading a program or app to see nearby Wi-Fi networks. Some programs/apps can also determine the frequencies and channels that Wi-Fi networks are using, but these versions are usually not free.

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Turn on the device at the same frequency. You can block 2.4GHz Wi-Fi signals using microwave ovens, older cordless phones, Bluetooth devices, and many other wireless devices. As long as they’re on a device labeled 2.4GHz, they’re likely to interfere with a nearby 2.4GHz network. There’s no way to predict the performance, but it can range from a slight drop in speed to a complete loss of signal.

The device must be transmitting. For example, you must play music on your phone or press the number keys for the device to work continuously.
Do not turn on the microwave oven if there is nothing inside.
To improve the interference ability of 2.4GHz cordless phones, remove the cover to expose the circuit, and then attach the antenna cable to the cord taped to the CD. ^{[4] X Research Sources} This behavior is illegal if jamming is prohibited in your location.

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Tune the router to control jamming well. If your Wi-Fi router operates on the same frequency, you can adjust the settings to cause targeted interference. Start by accessing the router settings. To proceed, open an Internet browser and enter the router address in the URL bar. You can try one of the following common options until you reach the router settings page:

http://192.168.0.1
http://192.168.1.1
http://192.168.2.1
http://192.168.1.11
If the above options don’t work, find the IP address of this router model on the network, or look in the Wi-Fi/network settings of your computer/mobile device. ^{[5] X Research Sources}
You may need to sign in to access settings. Refer to your router’s manual if you don’t know the password.

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Select broadcast channel. The router cannot use the entire signal range of the device at once. Instead, the signal will be divided into 14 channels in the 2.4GHz band and 23 channels in the 5GHz band. ^{[6] X Research Source} Depending on your router, you may not be able to access all channels, or your ability to change this setting may be limited. Just try to use as many channels as possible. If only one or two channels can be used at the same time, switch back and forth between the channels and check if the strength of the network you want to interfere with is reduced.

With a 2.4GHz signal, most routers work on channels 1, 6, and 11. You can use these channels to influence other networks.
Multiple overlapping channels in close range will also interfere with each other. Use channels 3, 7, and 11 to slow down most nearby Wi-Fi networks, at least a little.
At 5GHz signal there will be more channels available.

Prevent jamming and unauthorized use

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Set up physical barriers. Walls and furniture will significantly reduce the range and strength of the Wi-Fi signal. Metal objects, containers of water and other conductive objects are also particularly effective. Placing these items in front of a thin wall or window makes it harder for neighbors to steal your Wi-Fi. These obstructions will also prevent signals from outside from interfering with indoor equipment.

The 5Ghz Wi-Fi signal is especially poor when it comes to objects.

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Reduce the power level of the router. Most high-quality Wi-Fi routers have a power level adjustment setting. Lower this level to reduce signal strength. You may need to experiment to determine the right setting for the size of your home.

If young children in the house often sneak online at bedtime, you can consider reducing the power level nightly and increasing it again the next morning.

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Install a directional antenna. Replace your router’s antenna with a directional antenna if you only need to broadcast the signal to one place, such as your desktop or living room. This will significantly weaken the signal in places other than the direction of the antenna.

To save money, you can make the existing antenna “directional” by shielding the aluminum foil in any direction you want to block the signal.

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Adjust the router’s channel. Access router settings via Internet browser, then change channel settings to avoid interference by other networks. Check channels 1, 6, 11, and test the strength of the Wi-Fi signal around your home at each setting. Either of these settings will usually result in a network with a fast connection and less interference.

If the router allows access to channels 12 or more, check until the highest channel.
Many modern routers also have the option to automatically detect low-noise channels and switch back and forth. You should enable this feature (if available).
Each router manufacturer has its own set of settings. If you can’t find a channel option, check your device’s manual.

Advice

Common jammers have an operating range of 9 m. If the network you want to jam with covers a larger area, the jammer will create a blind spot with a radius of 9 m in that area.
If you’re trying to block your neighbor’s Wi-Fi signal, your connection will also slow down. To increase line speed, change the Wi-Fi settings in the opposite way to the instructions above.

Warning

In the United States, it is a federal crime to sell or use a jamming device (except for government use). Jamming devices are also banned in many other countries.
Jamming other people’s networks is an uncivilized and ineffective method, even if you do it legally. Instead, it would be better if you use this article to prevent interference with Wi-Fi channels.

Steps

Network interference

Prevent jamming and unauthorized use

Advice

Warning

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