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mobile phone signal jammer is mainly used in school examinations, college entrance examinations and some venues where the use of communication equipment such as mobile phones is prohibited. With the increase of communication network frequency bands, mobile phone signal jammers have shielded from the original 3-way antenna to 8-way antenna and even more than 10 The road antenna jammer is now the built-in antenna mobile phone signal jammer.So why do the signal jammers in the examination room choose built-in antenna signal jammers?First, the built-in antenna cell phone signal jammer has a beautiful appearance and conforms to modern aesthetic conditions.Second, the built-in mobile phone signal jammer is more environmentally friendly and safer. Before the signal jammer with the external metal shell has been turned on for a long time, the machine will generate a high temperature of 50-60 degrees, which also has certain safety hazards. Zhan Electronics built-in antenna mobile phone signal jammer is made of plastic shell, which solves this problem very well.
Third, the built-in antenna signal jammer is easy to carry and has better practicability, and the repair rate is lower, because the old external antenna jammer often had the antenna lost or damaged. It is very simple and convenient to use and carry in the shield shell. When you need it, you only need to turn on the power to start normal use. You don't need to disassemble the antenna after use, you only need to turn off the power, so it greatly improves the use of effect and later maintenance costs.

What’s a WiFi jammer?

A WiFi blocker is just one of the many tools that people can use to cut off channels of communication. There are other types of “jammers,” such as radio and cell phone jammers, which help to stop communication over radios and cellular devices. WiFi jammer can help you stop your WiFi from being used by devices nearby.

There are many different models of WiFi blockers with different levels of strength and various features. Choosing the right model means understanding how WiFi blockers and their features work. You’ll also need to understand how WiFi works so that you can calibrate the tool correctly.

Jammers, including portable wifi jammer, have been used by military and law enforcement for years. They are great tools for cutting off communications that adversaries are using to speak amongst each other or gain access to resources. They can also be used to interfere with and defuse bombs, which has been a life-saving function many times over.

How to Block WiFi?

As with all jammers, wifi singal jammer work by projecting out the same radio waves as the devices that you are trying to jam. In the case of jamming WiFi, you’ll want to set your jamming device to the same frequency as your WiFi router.

Blocking WiFi can be tricky, though, because routers typically are set to automatically find the best channel of communication with devices. They are able to switch between frequencies to find the least crowded one, keeping your internet speed at a satisfying level. As a result, a WiFi blocker must be prepared to block more than one frequency, or you’ll need to know how to manually set your router. 

How to Buy a WiFi Jammer?

Because some WiFi routers have more advanced features, you'll want to review your router's settings before buying a jammer. Basic router models may only have one or two settings to choose from, while others may give you more control.

The basic rule is to buy a WiFi jammer that can interfere with the exact frequency your WiFi router uses to communicate with your device. To do this, you need to check exactly which channels your router is capable of, and then buy a jammer that can interfere with at least one of them.

1. The area used. The shielding range of the wifi signal jammer is based on the power of the jammer. If it is tested in the field, the shielding range is different according to the strength of the local environmental signal. For example, the weak shielding range of the indoor signal is large, and there are GSM jammer base stations for outdoor use accessories. Then the GSM signal is close to the outdoor shielding range!

2, the size of the power. As we all know, 2G, 3G, 4G and 5G: Before buying, you need to know which signals you want to block. Ordinary mobile phone signals (2345G) can be selectively blocked. If you only block 23G or only 34G, this It can be adjusted before leaving the factory, and there are 2.4GWIFI, 5.8GWIFI and other frequency bands. Generally, ordinary signals can be quickly shielded.

3, the frequency range. Shielded frequency bands: CDMA800, GSM900, SCDMA1800, DCS1800, PHS1900

Mobile phone signal jammer have become standard equipment in the examination room, not only for middle and high school entrance examinations, but also for postgraduate examinations, civil service exams and various qualification certificates. Mobile phone signal jammers are required to prevent candidates from contacting the outside world through wireless signals. In the test room using Dazhan Electronics' mobile phone signal blocker, various mobile phone signals (2345G), wireless intercom signals, Bluetooth WiFi signals, etc. will be blocked by interference.

So let's talk about cell phone signal jammers, why can they interfere with your cell phone signal?

We can compare a mobile phone to a radio for the time being. The radio often appears to be sizzling or the channel can’t be heard directly. This means that the signal is interfered. Since the radio can be interfered, so can the mobile phone. and interference through some devices.

Types of cell phone jammers:

Cell phone signal jammers have many different names, gps jammers，wifi jammers，drone jammers, cell phone jammers, signal jammers, cell phone signal jammers, cell phone signal blockers, cell phone isolators, cell phone cutoffs, mobile communication signal jammers, cell phone signals Degree shielding instrument, mobile phone jammer, signal jammer, mobile phone blocker, signal blocker, mobile phone signal isolator, signal isolator, mobile phone signal blocker, radio signal blocker.

How does a jammer work?

It uses frequency doubling, frequency division, frequency hopping filtering and other technologies to analyze the required shielding frequency for the uplink and downlink channels of the mobile phone system; customizes a spherical shielding space according to the power of the shield, and automatically forms a shielding magnetic field within the specified range. , so that the mobile phones (including PHS- PHS GSM-China Unicom, China Mobile, CDMA-China Telecom) in this space are invalid. When the jammer is in working state, it can disable the function of sending and receiving signals of mobile phones within a specified range, and cannot dial out or dial in, so as to achieve the purpose of mandatory disabling.

The principle of radio communication: 

Within a certain frequency range, the mobile phone and the base station are connected by wireless electromagnetic waves to complete the transmission of data and sound with a certain baud rate and modulation method.

The communication principle of the mobile phone signal jammer, the jammer scans from the low-end frequency of the forward channel to the high-end at a certain speed during the working process. The scanning speed can cause garbled interference in the message signal received by the mobile phone, and the mobile phone cannot detect the normal data sent from the base station, so that the mobile phone cannot establish a connection with the base station. The mobile phone manifests as the phenomenon of searching the network, no signal, no service system, etc.

Now that we know that the communication method of wireless communication is to use electromagnetic waves to communicate.

The functional properties of electromagnetic waves are determined by their frequency.

The picture above shows the frequency range of the mobile phone signals of the three major operators that can be completely blocked by the Jammer mart electronic jammer. Our mobile phones must emit qualified electromagnetic waves in order to connect to our telecommunications carrier base stations.Different communication systems use different frequencies, so that everyone is safe and does not interfere with each other.
The Basics Principle of Cell Phone Jammers
The basic principle of cell phone jamming equipment is to emit the same radio frequency signal as the cell phone. Since the frequencies are the same, the cell phone cannot tell which signal is a regular base station signal, thus "jamming". As long as there is a machine on the same frequency as the phone, the base station will make a lot of "noise" when it tries to connect to the phone. You will find that the signal from the phone is unrecognizable, so you will refuse to communicate with the phone.In the early days, jammers only blocked one set of frequencies, such as 2G, while sophisticated jammers can block several types of networks at the same time, such as 2-3-4-5G.
So how is this multi-network interference achieved?
Actually simple. the interference bands corresponding to these three signals are repeated in a cyclic manner, covering these three interference bands at the same time. The interval of this cycle is so small that the mobile phone has no chance to speak, and can only sit and do it quietly. a brick.
2/3/4/5G covered, so what about bluetooth and wifi?It doesn't matter, it can be easily done as well.The jammer has evolved again, adding the frequency bands of bluetooth and wifi to the scanning range, so that several common communication methods in the society are completely covered.
Many people do not understand the difference between Bluetooth, Wi-Fi and mobile data. They seem to be wireless communication technologies. In fact, the main difference between them is the frequency band. In mobile communication technology, 2G mainly works in the 900-1700MHz band, 3G works in the 1900-2100MHz band, 4G works in the 2300-2500MHz band, and 5G works in the 3400-3600MHz band. Bluetooth and WiFi work at 2.4GHz.
In this way, the R&D engineers of Jammer mart can accurately identify the communication frequency band and develop a mobile phone signal blocker with the same frequency band, so as to achieve the purpose of completely shielding the wireless signal of mobile phones, which is a sacred help for education and fairness in examinations. 

Several high-profile incidents have led many people to think of them as the latter. And with drone technology advancing every year, it’s possible our skies will soon be filled with these little machines.

If you’re concerned about your security, you’ll be relieved to know there are drone jammer technologies out there.

Below, we’ll go through the dangers drones present and the methods we can use to combat them.

Drones raise some serious privacy and security concerns. Although many countries control civilian drone use through regulation, drones are frequently flown recklessly and without regard to local law.

In terms of privacy, drones are flying cameras free to go anywhere. There have been high profile cases of harassment by drone. They can be used to spy on gardens, through windows, and at schools.

Drones can also impact privacy simply due to their nature. Even when not recording, the sound of a drone flying overhead in addition to the emotional discomfort it causes can make someone reconsider spending time out on their own property.

Drones also post several huge physical security risks. There have been incidents in New York, near-miss events over Heathrow airport, and even drones trespassing on the White House.

Mishandled drones can cause severe injury. It’s not hard to imagine cases of head injuries rising with an increased use of drones.

Luckily, there are ways to protect yourself against illegal and irresponsible drone handlers.

Drones can be jammed with nothing more than the right wi-fi signal.

Many drones depend on wi-fi for key features. Some are even entirely controlled by it. While wi-fi makes drones accessible to more users, it does leave them open to network-based attacks. Security varies from drone to drone, but some drones use unsecured apps for control.

With as little as a laptop, wi-fi access, and an antenna, you can connect to these unsecured apps like you would a regular wi-fi network and turn your computer into a drone jammer. Using Telnet, you can access the open point and even shut off the device without the original owner knowing about it. In many cases a wifi jammer will also provide the same result.

Several long-range drone jammers are now on the market. These large, rifle-like devices work by blocking frequencies used by drones.

These cell phone jammer usually have an effective range of around 400 meters and a cone diameter of around 30 degrees.

Drones have in-built safety protocols that they default to in the event of signal loss. Usually, the drone is forced to descend, hover in place, or return to its owner. Some jammers attack GPS, so the former two are the most likely outcome.

There are also a few fixed emplacement drone jammers available. These are more like turrets, with the ability to auto-detect and jam drones.

Until laws and regulations catch up with irresponsible drone owners, you may need to think about your own security and privacy first. Be sure to stay informed on signal jamming technology by following our blog!

And remember to check your local laws and regulations before buying and deploying a drone jammer. Stay safe, but don’t break the law!

Jamming the phone does not violate the rights of others and the public interest. Jammers Blocking cell phone signals and dragging salaries from under is definitely far more effective than appeals, teacher meetings and harsh management actions. Jammers can penetrate other adjacent frequency bands and block public safety radio signals used by police officers and firefighters, he said. Under the relentless pursuit of the special police, suspect "Little Fat" Lu was arrested at 12:00 noon on March 13 in Xingfu Sixteen Village. Recently, the school is supervising students who use cellphones at school to have a new trick: to directly shield the cellphone signal so that the cellphone becomes a "brick". GPS jammer So how did this candidate from Wuhan, as a college entrance exam room with extremely strict management and supervision, go online to find answers through his cellphone? In fact, it is not difficult for candidates to bring their mobile phones into the exam room. Jammers prevent spy devices from working.

Williams said, "The results show that this micro cell phone jamming technology can have local impact.

wifi jammer European institutions like the European Environment Agency are more cautious than American institutions. " Hong Kong has reportedly used mobile jammers for the past month. This city is full of crazy cell phones. There are 6 million people and 5. 2 million cell phones. Japan relaxed its regulations on cell phone jammers more than two years ago, allowing licenses to be used in certain public places such as theatres.This is because cell phone jammers are devices that prevent cell phones from receiving and transmitting cell phone signals to nearby locations. This can block signals within the jamming frequency range of a particular cell phone jammer, losing the ability to make outside calls and send messages. Precisely because of the jammer's powerful function, it can stand out from various high-tech products and become the most popular product. Teach you how to make a simple jammer. GPS jammers have been installed in many places. It has received a lot of praise. There are many uses.

That is, it interferes with the base station's downlink signal. Mobile phone, also known as cell phone, hand-held cell phone, wallet to take with you, restaurants, entertainment, travel, life services, Baidu Baike, etc. Turn on cell phone sign

Steve Largent, chairman and CEO of the CTIA-Wireless Association, said the legislation includes safeguards to ensure signal jamming products do not interfere with communications between public safety officials or legal use outside of prison. When the phone tries to connect to the tower, you can't do that, otherwise there will be other noises.

signal jammer are small and compact anti-tracking devices that transmit radio frequency (RF signals) to interfere with GPS devices such as cell phones, Wi-Fi signals, and car GPS trackers. GPS blockers are portable, low power, and smartly designed to function as shielding instruments only when required. Moreover, there are many kinds of GPS jammers, such as remote control jammers and drone jammers, used to block GPS signals from mobile networks, vehicle trackers, and spy cameras.

A GPS jammer can obstruct signals to and from a vehicle by sending radio frequencies that match the signal frequency of the vehicle’s GPS tracker. Because of this, interference of signals occurs, and the GPS tracker on the car cannot determine location.

To understand how GPS jammer work, it is first vital to know how GPS tracking devices function. All GPS devices work in the same way by employing a trilateration method to figure out the location, speed, and altitude of an item. GPS devices work in tandem with satellites that use sophisticated technology to broadcast the position and time of the GPS device. In essence, using satellite positioning, GPS devices calculate the time and distance it takes for a signal to travel from the device to a satellite to estimate the exact location of an object. A typical GPS tracker will use data from four or five satellites to form accurate real-time navigation or positioning.

A GPS signal jammer works by disrupting the transmission of satellite signals to and from the GPS device. Signal jammers create an interference pattern by transmitting signals that match the frequency of the GPS device but with a shorter range and higher power. This creates noise that interrupts the transmission path between GPS and GSM networks such as 2G, 3G, and 4G, usually targeted by cell phone jammers. However, desktop and Wi-Fi jammers use the same principle of interference to block off Bluetooth and Wi-Fi signals.

手机干扰器需要连接到电源。如果在汽车上使用，它连接到点烟器插座。将 GPS 干扰器放在已安装的 GPS 跟踪器附近激活 GPS 干扰器。确保将 GPS 干扰设备放置在 GPS 跟踪器 10 米范围内，以干扰卫星信号。  

信号拦截器对执法当局和车队所有者来说都是一种滋扰。妨碍警方的重要应急通讯，对社区安全构成威胁。同样，车队经理需要与车辆跟踪器进行不间断的信号传输。否则，他们将无法计算车队距离、行驶时间、测量脚速以及监控粗心驾驶的情况。GPS 拦截器可能会破坏所有这些过程并导致无法记录数据并影响车队安全。为了防止出现意外情况，执法部门和车队所有者需要采用阻止反跟踪的技术。

防止 GPS 干扰的最简单方法是使用内置检测信号阻断器的 GPS 设备和软件。Lojack GPS 等设备可以检测 GPS 和 GSM 2G、3G 和 4G 信号干扰，并向车队管理人员提醒失去实时跟踪的威胁。除此之外，车队经理可以通过密切监控车队 GPS 传输来阻止员工对 GPS 的干扰。每当员工启用 GPS 干扰时，车队管理软件都会显示该员工车辆的丢失或中断信号。通过记录中断信号，企业主可以提示员工限制使用 GPS 干扰器。最后，GPS 跟踪器的定期维护检查在抵消数据篡改和 GPS 干扰的潜在漏洞方面大有帮助。

How to get rid of smart phone or mobile phone addiction? Here www.perfectjammer.com you will find the right answer. As far as you want to go away, you will find out a signal jammer will be a good gift to get rid of the smart phone addiction.

You know that with the development of modern science and technology, mobile phones especially the smart phones have been widely used all over the world for their excellent performance. We can surf the Internet whenever we want. We can relax on the platform it provides. More importantly, many new high quality resources can be downloaded. However, some people are addicted to mobile phones, which have a side effect on their normal life. Cell phone addiction is a new psychological disease, which is mainly manifested in people’s anxiety without cell phones. A few other performances are bad for our health. How to avoid the bad effects of the cell phone addiction, you will find the right answer from buying one cell phone jammer.

Why we advocate to get rid of the cell phone addiction?

Following you will get the right answer. For example, they often use their phones to avoid social interaction, they often text like they’re walking down the street, and they never turn it off. Because of the rapid growth of life, we don’t have enough time to enjoy it. Therefore, we prefer to play with the mobile phone, it can make full use of our daily small space, no matter how busy we are. With that in mind, some people are easily addicted to cell phones. At the same time, they are under a great deal of stress, and cell phones can help them relax. By playing mini-games, chatting with friends, watching movies and listening to music, people can easily forget their problems for a while. On the other hand, there’s always something new on the phone. It can be fun, mysterious, and varied. So people really want to turn on their phones and see what’s going on around them. It is the funny world of smart phone, while it is not the true world in real life; we live in the world, so we should get rid of the cell phone addiction and adapt to the real world. 

Action now

buy one mobile phone jammer to cut off the unnecessary phone signal as you need.A GSM jammer is an instrument used to protect the cell phones from the receiving signal. The jamming is said to be successful when the mobile phone signals are disabled in a location if the mobile jammer is enabled.

A cell phone jammer doesn’t jam in the same way that a printer may experience a paper jam. Rather than block, cell phone jammers intersect and interfere.

Cell phones, like most wireless electronics, work off of signals. Any incoming data will come via a signal transmitted at a specific frequency. This frequency can vary depending on the signal, data, sender, and many other factors.

To jam a signal, most cell phone jammers will meet that signal with one of the same frequencies. This causes a cell phone not to register either signal properly, as they conflict.