What can interfere with a wireless network signal?

As a result, the wireless LAN will be affected by the radio frequency interference of some sudden wireless devices in the same frequency band in the actual operating environment. Such as microwave ovens, Bluetooth mobile phone signals are in the frequency band. Therefore, when working on a wireless LAN, suddenly turning on a microwave oven in its area, or using a Bluetooth headset on a Bluetooth mobile phone, or suddenly having other wireless devices running in the same frequency band will interfere with the wireless signal of the wireless LAN.

Changes in the physical environment of a wireless network, such as the sudden appearance of a large obstacle between the wireless AP and the wireless client, will directly lead to a sudden and large decrease in the network performance of the wireless LAN, and directly lead to the interruption or rate reduction of the wireless signal. There is also interference that comes from the wireless LAN itself, and that is interference from different channels in the same frequency band. This interesting situation can only occur in home users where wireless APs on the same floor are adjacent or close to each other in buildings interfere with each other.

Different channels without interference should be used between adjacent wireless AP devices. For example, interference can be eliminated by using channels that are five bands apart, and a typical non-interference channel is set up as 1, 6, and 11 channels, respectively.

The principle of network cable anti-interference: if the two signal lines are received by the same (same phase, equal amplitude) interference signal, because the receiving end subtracts the signal of the two lines received, so the interference signal is basically canceled out, then how can we ensure that the interference signal received by the two signal lines is as in-phase and equal amplitude as possible? One of the ways is to twist the two wires together and analyze them according to the principle of electromagnetism

It can be approximated that the interference signals received by the two signal lines are in phase and of equal amplitude. When the two lines are intertwined, they will not only resist external interference, but also prevent themselves from interfering with others. The most commonly used is twisted pair.

Most LANs use an unshielded twisted pair (UTP) as the transmission medium for cabling, and the network cable consists of a twisted pair cable with an RJ45 head at a certain distance. The twisted pair is made up of 8 wires of different colors divided into 4 pairs twisted together, and the effect of twisting in a team is to reduce the influence of electromagnetic radiation and external electromagnetic interference as much as possible.

The network cable transmits a differential signal, one positive and one negative, and the network cable is twisted in one direction, which has nothing to do with clockwise and counterclockwise. Differential mode transmission means that the transmitter transmits an electrical signal with equal amplitude and opposite phase on two signal lines, and the receiver performs subtraction operations on the received two line signals, so as to obtain a signal with double amplitude.

There are many ways to interfere with the network information signal, but this time it should be illegal.

You can go and buy a network jammer. There should be a lot of this online or ** or other buying and selling platforms.

The only way to do this is to operate in a place where the signal is good.

What can I do to interfere with the network cable signal? It is possible to interfere with cans.

Wireless interference is mainly due to wireless transmission through space, so when the signal is in the same frequency band, it will lead to co-channel interference, if you want to avoid interference, you must first determine what is the cause of interference in your environment, whether it is co-channel interference caused by too many wireless devices, or the channel is not divided, or there are other interference sources caused by it, which need to be specifically analyzed. The simplest, lowest, and most effective way to find the root cause of the interference and solve it.

For example, if the channel is not divided (most wireless routes and APs are automatically assigned channels, and when there are multiple such devices in the same scenario, if they are automatically assigned to the same channel, wireless interference will be caused), then these devices need to be manually divided into different channels (such as channels). If there are other illegal APs acting as interference sources, you need to manually shut down these interference sources.

Of course, if it is a waste of manpower and material resources to manually divide channels or turn off interference sources in large-area scenarios, you can choose a wireless AP that can be automatically optimized (automatically and reasonably allocate channels and block illegal interference sources, such as NetMoon).

1. There are too many wireless wifi signal sources, causing interference.

Today's wireless routers generally work in the 5GHz frequency band, most of which are. Many routers have the default channel set to 1 or 6 by default. In this way, under the same frequency and channel, interference is very tolerant.

Just like the interference results of sound in the same wavelength band, there will be a lot of noise and noise, and it will be difficult to hear. After WiFi interference, there is packet loss of Internet data and slow opening of web pages. Resolved:

If the router you use still has a 5G frequency band, even the 5G network can generally be solved, because most routers currently use it.

2. Interference from other co-channel equipment.

The same equipment that works in the microwave oven, Bluetooth equipment, etc., generally Bluetooth devices have small transmission power, so there is no need to consider interference. When the microwave oven is working, the leakage of power is terrible, which will cause a lot of interference. Resolved:

Microwave ovens, appliances with wifi modules, etc., stay away from the router.

3.Interference from location.

If the router is placed in a corner, against a wall, the signal will be weakened because it needs to pass through the wall and travel a relatively long distance.

Solution: The router should be placed in a spacious place, for example, in the center of the house, an open area is a good choice. We can keep the antenna of the router upwards so that the upper part of the space has more signal coverage.

4.Wireless channel.

In the Wi-Fi frequency band, 13 channels can be used in China, and only 3 channels do not interfere with each other, such as the commonly used channels. Therefore, the default channel set by the factory of the router is generally 1 or 6, so it is easy to cause interference when the signal is piled up. Resolved:

Just find the channel with sparse signal and set it. Or if it is more convenient, just set it to 6 or 11, which is generally better.

Method 1: Detect which channel the wireless router uses, then turn on another router, use the same channel, place it in a suitable position, and enable the wireless network.

Method 2: The microwave frequency of the microwave oven is about the same as that of the wireless router, you can turn on the microwave oven in the appropriate position, if you turn on the microwave oven between the wireless router and the wireless receiver, the interference effect is very good.

Method 3: The interference effect of the induction cooker on the wireless signal is also better, and the method of use is the same as that of method 2.

Method 4: Use the characteristics of metal objects that can block wifi radio waves, and place iron sheets, aluminum plates, and stainless steel nets between the wireless router and the wireless receiver.

Method 5: Find a way directly on the wireless router, which is often simpler. If you block the wireless signal with a metal object, only a smaller object is needed.

You can also remove the antenna of your wireless router or use a can to cover your wireless router antenna. can produce good results.

1. Check whether the distance between the wireless network card and the wireless router is appropriate, when the distance between them is very far, you may wish to shorten their communication distance, and remove all the obvious obstacles between them to increase the signal reception capacity of the wireless network card. If the distance between them cannot be adjusted, antennas can be used to appropriately extend the wireless network coverage. Check if there are strong sources of signal interference around the wireless network.

2. First of all, check whether the distance between the wireless network card and the wireless router is appropriate, when the distance between them is very far, you may wish to shorten their communication distance, and remove all the obvious obstacles between them to increase the signal reception capacity of the wireless network card.

3. Secondly, check whether there are strong signal interference sources around the wireless network. One way to reduce RF collisions is to ensure that the wireless network has a strong signal that can pass through where its users are.

4. Choose a wireless router with strong transmitting power for networking. If the transmission power of the wireless router is very small, it will cause the wireless Internet signal to be very weak, then the wireless network card will be difficult to receive the Internet signal normally, and the success rate of the wireless connection is naturally not high.