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Cell phone signal jammer, or mobile communication jammer, is a technology product used to block cell phone communication signals, maintain order and prevent leaks. Mobile phone signal jammer is aimed at all kinds of examination room, school, gas stations, the church, the court, library, meeting center (room), theaters, hospitals, government, finance, prisons, public security, military area and other places to ban the use of mobile phone. In the process of work, the shield will be scanned at the low end of the channel at a certain speed. The scan speed can be used to signal the signal in the mobile phone to form a chaotic signal, and the cell phone cannot be connected to the base station. Mobile phone performance is search network, no signal, no service system and so on. There are many outlets for sales jammers and a lot of products. In addition to the "five head" shield, there are "six" and "eight". According to merchants, each "head" corresponds to different frequency bands, and the more "heads", the more types of signals are blocked. Most of the jammers are purchased by schools and companies, and some schools are available at eight or eight. "Companies are buying to keep employees from talking on the phone during office hours, and schools are used to ensure the safety of the exam room and prevent people from playing in the classroom." Mobile phone signal jammers are mainly used in major examinations, such as gaokao, civil service examinations, etc., and related equipment is purchased by the superior departments. To interfere with cell phone signals, you must have a device that emits the same frequency of radio waves.The cellular signal jammer is such a device. When plugged in, the jammer emits a 1.8ghz radio wave. Cell phone signals in the range of influence are blocked and light, which can seriously affect the quality of the call.
In a vacuum, radio waves can be spread out indefinitely. But in cities, high buildings and poor air quality, the radio waves from the device slowly fade away.Within a radius of 25 meters, the phone will be strongly disturbed by the jammer. The effective range of 25 meters will also be affected by a lighter touch.
Any wireless technology will be affected by interference, both military and civilian. As a civilian WiFi jammer, the use of the common ISM frequency band (2.4 GHz) is not required, and the interference is more "variety and variety".
A concept often referred to in wireless is called "noise", which generally refers to the non-signal content received by a wireless receiver while receiving a signal. These noises can cause wireless reception to not accurately identify information. Noise may be a "white noise" for WiFi receivers, or a wireless signal that is not "interpreted" by other standards.The interruptions we're talking about are not the same as noise. To be sure, some of the interference comes from "noise," and some of it comes from information collisions and overhead in WiFi mechanisms.
Here's a look at some of the technologies and devices that can interfere with WiFi signals:
1. Microwave oven
Microwave oven emitted by microwave is 2.4 GHz, using water molecules to absorb the energy of this band, to heat up to achieve the cooking food. The microwave oven at work may reach 1000-2000w, and the microwave will produce a "micro" electromagnetic leakage. The leaked energy is small, but the impact is likely to be fatal for wi-fi only about 100mW. Because of the power of the microwave, the WiFi signal is as small as an ant, and when the WiFi device receives the data, it is as difficult as a needle in a haystack. Therefore, the microwave oven is generally placed far away from the AP, or the microwave will seriously affect the reception of the WiFi signal.
2. Bluetooth, cordless telephone, etc
Bluetooth and cordless phones are also wireless technologies working on 2.4ghz. Currently, the use of bluetooth is very wide, and low power and convenient connection are the main features. Although the bluetooth power is small, the effect on the wireless is generally small, but the number of such terminals is high, so the interference of WiFi can not be underestimated.
3. Interference of WiFi adjacent channel
In the 2.4GHz band used in WiFi, there are 13 channels available at home, but there are only 3 channels that are not interfered with each other, such as 1, 6, and 11 channels commonly used. Can be seen from the figure 1, channel 1 and channel 6 WLAN signal frequency is not overlapping, but overlapping part of the channel 1 and channel 2 is very big, overlapping parts is two channel interference, the greater the overlap parts, the stronger the interfere with each other. So if there are two WiFi devices in the same coverage area and both channel 1 and channel 2, the interference between the two devices will be more serious. In the deployment of WiFi network, it is important to be careful not to appear as channel 1, 2, 3 and other adjacent AP and work in the same area.
4. WiFi and channel interference
If both the AP and its users are in the same coverage area, there must be channel competition between the two WLAN networks. Because WiFi USES the CSMA-CA mechanism, the more the WiFi and channel devices are in the same region, the more competitive the competition will be, and the higher the competition cost, the smaller the actual available bandwidth. Therefore, when the AP is deployed, it should be noted that the location of the same channel AP is staggered and the AP of the same channel is not too close to the AP.
If you find that there may be a WiFi network interference, suggest to use spectrum analysis function of the AP (such as H3C I series AP), identify the source of the interference, then according to different interference, the use of different coping methods.
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Because of the interactive nature of the network, once the network privacy is infringed, the cost is huge, and the consequences are far greater than those against traditional privacy. Therefore, the right to privacy becomes more important, the protection of network privacy issues become one of the biggest problems caused by the Internet, to strengthen the network environment for personal privacy protection, has become a top priority. There are some tools you can use to protect your privacy,such as wifi signal blocker.The general Internet users how to protect their privacy is not leaked, I listed here the main points:
1.The Operating System Security:
First of all, ensure the computer operating system security.The important and urgent patches need to be installed.Since the operating system has automatic update patch function now, the system should update frequently to ensure security. If the operating system security can not be guaranteed, hackers or Trojans can easily get through the system vulnerabilities to obtain the user's various privacy information. For Windows systems, the daily login system, preferably log in with Power User or User group instead of using the Administrators group.As a result, if the computer is attacked, the harm is controllable.
2.The Security of Mobile Phones:
From the security, the common mobile phone inside the iPhone security is not the best escape, use the iPhone need to "fingerprint unlock" feature and "find my iPhone" feature open, while ensuring Apple ID password security, using a unique security password. And if you are afraid of someone tracking your phone,a cell phone signal jammer can help you.If the phone is lost, you should log in the iCloud site in the first time, go into "find my iPhone" to enable "lost mode", so others can not use any of your mobile phone (not even brush machine) .Secondly,call the operator to report the loss of SIM card In case of emergency, you can remotely wipe the information inside the phone in iCloud site.
3. The Security of the Software:
Avoid the use of those suspected softwares which have the risk of losing privacy as far as possible. As for some softwares developed by small companies,you should use with caution, do not enter personal privacy information inside. The choice of commonly used software is also very important.
4, Two-step Verification:
If you are using a two-step verification function, in theory, all sensitive accounts should try to open the two-step verification, while the mobile phone APP application produce a one-time random password. Currently, the main software that supports 2-Step Verification is Google (Gmail), Hotmail, Dropbox, Amazon, Lastpass, Apple, Facebook, Twitter, Evernote, Github, WordPress, Linode, etc., all of which should be turned on Authentication, so that even if the hacker through other means to obtain the user's password, because there is no random phone password, so still unable to log on to the user's account.
