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Due to the development of communication technology, personal mobile communications have brought convenience to people's lives, but the adverse effects on prisons, detention centers and other similar situations have become increasingly prominent. Once mobile phones are illegally brought into prisons and used, it will bring great harm to the management and security of prisons, detention centers and other places. Therefore, only by establishing a truly effective mobile phone signal blocking system can we provide prisons and detention centers with strong technological support.

However, due to the current mixed market, many cheap cell phone jammers are mainly suitable for general civilian use due to limitations in performance indicators, reliability, operating conditions, etc. However, there may be certain problems when used in large places such as prisons and detention centers. For example, external interference problems, some even seriously affect public communications.

Why do mobile phone signal jammers purchased by the Provincial Prison Administration Bureau cause such great interference to surrounding public communications? Let me analyze it a little bit. If there are any shortcomings, I hope you guys can correct me:

1. Mobile phone signal shielding is technically just a small branch of the wireless signal shielding system. Its essence is electronic countermeasures, or co-channel interference, which uses equipment to send out high-frequency signals through antennas, allowing mobile phones to receive them. Bit errors occur during the downlink signal and cannot be recognized and connected to the network. The mobile phone displays a no-network status, which meets the signal shielding requirements;

2. Regarding mobile phone signal blocker, everyone knows that they need to interfere with downlink signals. However, due to a series of factors such as technical cost, price, and production constraints, it is difficult to only interfere with downlink signals. Therefore, some unscrupulous manufacturers do not make accurate signal jammers in order to improve the interference effect. Adjusting the frequency range will cause some interference energy to the uplink, which can indeed greatly improve the interference capability and achieve a hit-or-miss effect, but it sacrifices public interests;

3. Mobile phone signals may vary greatly in the same room at different locations and at different times. According to actual experience, it can reach about 10dBm. In terms of conversion success rate, the difference is 10 times. It can be seen that mobile phone signal blocking is actually a technically demanding project, and it cannot be solved by simply purchasing a mobile phone signal jammer and installing it yourself. Site survey, power calculation, construction design, equipment debugging, etc. are all complementary and inseparable.

4. As Liuzhou Prison purchased and installed more than 300 mobile phone signal jammers, from a professional point of view, there are major problems in itself. When signal shielding is required in a large area and complex environment, high-gain antennas should be used for large-scale shielding combined with small The indoor antenna at the leakage point in the range is shielded by supplementary optimization. The angle of the antenna and the power of the equipment require professional personnel to configure and debug in order to achieve the perfect effect of strict shielding inside the prison and no interference outside the prison. Short-term signal shielding in schools can use high-quality low-power portable jammers or temporary antenna deployment.

There are many power supply methods for 5G jammers. First, they are classified according to the size of the radio frequency transmission power. The power supply methods of 5G mobile phone jammers in different categories are roughly as follows:

1. High-power 5G mobile phone jammer (transmitting power greater than 50W): usually powered by AC directly. Because the power supply of this type of product consumes a lot of power, AC power supply can provide sufficient power to the device;

2. Medium-power 5G mobile phone jammer (transmission power greater than 2-20W): Most use AC power supply, and a small number use DC power supply or AC and DC switchable power supply;

3. Low-power 5G mobile phone jammer (transmission power less than 2W): Most of these products are handheld or concealed 5G mobile phone jammers. These products are mainly powered by DC. When powered by AC, they mainly charge the battery. . Some models can be turned on while charging.

Due to its small transmitting power, the low-power 5G cell phone signal jammer usually consumes no more than 200W. Therefore, some customers also use it in cars and use the cigarette lighter interface on the vehicle for power supply. It must be noted here that the total power output of the car cigarette lighter is limited. Once the power is overloaded, it may cause damage to the vehicle's power line.

At present, you can often see the appearance of mobile phone signal jammers in examination rooms in schools. It is not uncommon until now. On the contrary, it is used in more and more places. It is generally used before and after the classroom and when preparing for exams. This device not only blocks mobile phone signals, but also provides candidates with a level playing field. The installation of a mobile phone signal jammer in the examination room may result in no network signal in an area, so special attention must be paid when using it, but this does not affect the transmission of base station signals.

Mobile phones have affected everyone's lifestyle, but this may have an impact on some students. Excessive use of mobile phones will not only affect vision, but may also affect academic studies. Since the emergence of mobile phone signal jammers in examination rooms, it has cracked down on the use of mobile phones by some students in school. And it only blocks mobile phone signals, and the use of other electronic devices and signals from base stations are not affected. Nowadays, many students have mobile phones, lack self-control, are addicted to games and novels, and use mobile phones to cheat in exams. Many schools install them and control them.

Send signals in the designated frequency band and block the mobile signals received by the mobile phone. In this way, the mobile phone cannot connect to the network and cannot send and receive short messages through the mobile phone, making the original message unrecognizable, thus achieving the purpose of shielding. This is the main purpose of the cell phone signal jammer in the examination room. work process. Reasonable use can completely avoid interfering with the normal use of other electronic products, so there is no need to worry too much about such products.

HA-1000A multifunctional wifi jammer is a new high-tech communication information security and confidentiality product carefully developed by our company in response to the national Ministry of Education's standardized examination room construction requirements and based on the current detailed situation of various wireless signal cheating tools in the examination room, using modern high and new technologies. . This device effectively blocks all 2G/3G/4G/5G mobile phones, 2.4G/5.8G (WLAN/WIFI/Bluetooth), walkie-talkies (wireless invisible headphones, bone conduction headphones), cameras and built-in LED display wireless digital transmission and reception in the examination room Tools (erasers, watches, rulers, reading pens, glasses probes) and other wireless cheating tool signals. By emitting specific electromagnetic signals, an electric fence is formed in the examination place where cheating needs to be prevented, so that all wireless signal cheating tools in the examination room cannot be connected with the outside world, ensuring that the examination is safe, fair, and orderly, and meeting the requirements for preventing cheating in the examination room. need.

This device is suitable for anti-cheating in exams or other information security and confidentiality places.

Features:

Do you need to block signals on certain bands and carry your device with you when needed, and if so, which type is right for you? Of course, in this case, a portable cell phone signal jammer might be your best option if you're wondering where to get a high-quality signal.

For each type of thing even though the function is the same, they are made of different materials in different colors and divided into different catalogs, so it is the same according to the function and the case of the portable cell phone signal jammer. So they are also divided into different series, such as portable GPS shield, portable cellular phone shield, portable WiFi jammer or portable multi-function jammer such as WiFi signal shield for handheld cellular phone and GPS jammer for handheld cellular phone and so on. In the following article, this article will tell you some information about handheld cell phone WiFi signal jammers.

If so, you can take a look at this handheld phone and WiFi signal jammer, its full name is "Handheld Phone and WiFi Signal Jammer", which is a perfect multifunctional phone and WiFi signal jammer, depending on the The shielding range is up to 15 meters for simultaneous blocking of WiFi, CDMA, GSM, DCS/PCS and 3G signals based on the signal strength within a given area. Besides the size of this handheld phone, the design of the WiFi signal jammer is really great and you can easily take it out and use it when you need it. Additionally, you don’t need to worry about the device generating high temperatures when in use as it has a cooling fan inside to ensure the shield is in good working order.

As long as you have this handheld signal jammer, you can not only have a peaceful environment, away from the noise of cell phone calls, but also not be blocked when you are deep in thought. Therefore, you can also use this handheld cell phone WiFi signal jammer to prevent tracking by cell phone signal tracking devices. Therefore, you can also use it to block WiFi2.4G to ensure the security posture of your network and ensure that others do not use it. There are many other ways and places where this handheld cell phone WiFi signal jammer can be used, as well as other types of portable cell phone signal jammers.

Choosing the right cell phone jammer is crucial to meet your needs. This article will provide some helpful tips to help you find the best cell phone signal jammer for you.

First, to choose a suitable cell phone jammer, you need to understand your needs. Consider the following questions:
Do you need to block signals in specific frequency bands, or do you want to block all signals?
To what extent do you need to block the signal? Is it throughout the building, or just in specific areas?
Do you need a mobile jammer for use in different locations?
What is your budget for jammer performance and price?

Different cell phone signal jammers have different performance and functions. Some higher-end models may have wider band coverage, greater signal blocking capabilities, and custom setup options. You should choose the appropriate model based on your needs.

When purchasing and using a cell phone jammer, be sure to check the laws and regulations in your area. Some locations may have restrictions on the use of cell phone jammers or require a specific license. Make sure your purchase and use is legal.

Finally, don’t forget to read other users’ reviews and recommendations. The experiences of others can provide you with helpful information about different models and brands, helping you make an informed choice.

All in all, choosing a cell phone signal jammer that suits your needs requires careful consideration and research. You can find a cell phone jammer that meets your needs by understanding your needs, finding trusted brands, considering performance and features, complying with legal regulations, and consulting other users' recommendations.

Before the cell phone jammer is officially put into use, it is not sure whether the cell phone signal jammer can meet the shielding requirements of the use site. Therefore, the shielding effect of the mobile phone signal jammer at the use site must be tested first, and then the mobile phone signal jammer can be determined. installation location and quantity.

Before powering on the mobile phone signal jammer, first roughly determine where you want the cell phone signal jammer to be installed at the use site, and then place the cell phone signal jammer on the desktop against the wall. Generally, it is placed first on the use site. At the front and rear corners of the site, turn on the power of the cell phone signal jammer and turn on the switch. Then you can test the shielding effect of the cell phone signal jammer.

When testing, first prepare three cell phones from different operators and they can be used normally. It is best to have three cell phones of different brands. Then place the cell phone in the opposite corner of the cell phone signal jammer, which is also the farthest position from the cell phone signal jammer. Then let the cell phone sit for about 2 minutes. During this period, do not perform any operations on the cell phone, and then check the cell phone screen. Check whether the cell phone signal is blocked. If it shows no cell phone signal, then the cell phone of this operator is blocked. In this case, it can be determined that the cell phone signal jammer can block the entire use site. If a certain cell phone shows that there is a signal, you can try to call the operator's customer service hotline, or use the mobile phone network for data access. If the phone does not respond for a long time when making calls or data surfing the Internet, you need to try this operation multiple times until there is no signal or the phone signal is restored. If you can make calls or use data to access the Internet, move your phone closer to the cell phone signal jammer, and then proceed to the previous steps to test repeatedly. Repeat this process until the phone cannot make calls, cannot access data or access the Internet, or the phone shows no signal. Use this to determine the shielding range of a certain operator's cell phone signal by the cell phone signal jammer, and then use this shielding range to determine the number of cell phone signal blockers to use.

If the cell phone signal at the site is strong and the low-power cell phone signal jammer cannot completely block the cell phone signal of a certain operator, you can determine the signal frequency band that the cell phone signal jammer cannot block, and then use the tested frequency band to Just do the direct interference of the high-power shielding module for this frequency band. First, you need to use an Android phone to download the Cellular-Z mobile APP, then open the mobile APP with the cell phone signal jammer turned on, and then take a screenshot and send it to the manufacturer of the mobile phone signal jammer, who will determine the mobile phone signal jammer. Mobile phone signal frequency bands that cannot be blocked. Finally, by using a high-power shielding module to cover the frequency band with a strong signal, the on-site mobile phone signal can be shielded.

In recent years, as the number of users purchasing and using mobile phone shielding equipment continues to increase, when users give us feedback on their use experience, they usually talk about the issue of shielding distance, and most of them hope that the shielding distance can be achieved In larger areas, and even in some relatively open areas, it is expected that one or two shielding devices can solve all mobile phone signal blocking problems. Then the question immediately arises. Is there an upper limit on the shielding distance of current mobile phone shielding equipment? If there is an upper limit, what is the upper limit of this shielding distance?

Any customer who has a certain understanding of mobile phone shielding equipment will know that the effective shielding distance of 5G signal blockers are closely related to the environmental signal strength of the site where it is used. To be more detailed, that is the use of 5G base stations around the site. The distance determines the shielding distance. If the 5G base station is more than 1km away from the site, the mobile phone shielding instrument will have a very large range, and the effective shielding radius will reach tens of meters. If the 5G base station is only three to four hundred meters away from the site, then the operating distance of the mobile phone shielding instrument will be much shorter, and may only be maintained at about one to twenty meters. If the distance between the 5G base station and the site is less than 200 meters, the consequences will be more serious. Conventional low-power mobile phone shielding instruments can hardly play a shielding role, and the radius of their effective shielding range may be only 1-2 meters.

After knowing the above analysis, how to define the upper limit of the shielding distance of cell phone jammer equipment? Obviously, this upper limit must be inseparable from the distance between the on-site environment and the surrounding base stations. There are also two important influencing factors: one is the radio frequency transmission power of the shielding device, and the other is the antenna used by the shielding device.

Let’s look at the first point first. Regarding the radio frequency transmission power of mobile phone shielding equipment, according to common sense, the greater the transmission power, the greater the effective distance. At present, the maximum RF power is basically able to achieve 100-200W for a single frequency band module, and the corresponding effective distance is about 200-500 meters.

Let’s look at the second point. Regarding the antenna used with the mobile phone shielding instrument, there are two options: using a high-gain directional antenna, the effective shielding distance will definitely be much greater than using a low-gain omnidirectional antenna. However, The use of directional antennas only increases the shielding distance in the targeted direction, while giving up a large area of effective shielding range in the side and back areas.

A cell phone signal jammer for sale instrument in the form of a backpack, usually also called a portable mobile phone signal jammer instrument, is mainly used in outdoor environments or in the handling of temporary emergencies. Because it looks like a travel backpack, a normal adult man can Can be carried anywhere. Then the customer’s problem comes. When this backpack-type cell phone signal jammer instrument is carried on the body, the many antennas on the device are really close to the human body, especially the brain. In this way Aren’t you worried about the harm to the human body due to the way it is used?

It is not excessive for customers to have such worries. Frankly speaking, this backpack-type cell phone signal jammer instrument has a built-in shielding module. The RF transmission power is usually about 10-20W. After it is emitted through the antenna, if it is really carrying When the computer is powered on, the electromagnetic radiation generated still has a certain intensity. However, electromagnetic radiation is not nuclear radiation, and it is not that scary. The harm to the human body is far less serious and terrible than people think.

If a medium-power cell phone signal blocker instrument like this is only used for a short period of time and is not used repeatedly every day, the harm to the human body caused by such a small amount of electromagnetic radiation is almost negligible.

Moreover, this backpack-type cell phone blocker instrument is usually powered by a built-in battery. The continuous working time of the battery is generally only 1-2 hours, so it will not cause long-term electromagnetic radiation to the human body.

Finally, we should also remind you: in real application scenarios, unless it is the military or special police or special service personnel, under extremely special mission situations, cell phone signal blocking equipment will be turned on while the person is carrying it on their backs. In most cases, this backpack-type cell phone signal jammer instrument is mainly for easy portability or quick transfer to the target site, rather than for long-term and continuous use while in motion.

After some customers purchased our Signal Jammer, in the process of preparing to install it, they took out several matching antennas and found that many of the antennas had exactly the same appearance, so the customer's question came: Why are the same mobile phones used? Do all signal jammers have the same antennas? Are they interchangeable?

Let’s talk about the answer first: Although these antennas look very similar, they are actually different, and they are basically not interchangeable.

If customers carefully identify the antenna, especially at the end of the antenna, they will usually see obvious signs. The identification information generally includes: port number, operating frequency range, standing wave ratio, antenna gain value, etc.

At the same time, if customers look at the host of the mobile phone signal jammer, they will find that there will definitely be a very conspicuous port number near each RF output port of the host. This is to clearly inform you that each antenna must be connected according to the port serial number and the port serial number on the Cell Phone Blocker host. Never reverse the order or mix it up.

Each antenna has its own fixed operating frequency. Only when the radio frequency port is connected correctly can it perform its best performance at the corresponding frequency. When connected randomly, because the working frequency is not suitable, the consequence of this is that the antenna may produce signal self-excitation and cannot output power normally, which will further lead to energy accumulation, overheating of the interface, or direct damage to components such as power amplifiers.

In order to make the antenna as beautiful and anti-vandal as possible, and to keep it as consistent as possible when installed and used with a cell phone signal jammer, the manufacturer of the antenna designed the antenna shell to be almost the same. However, in order to make a distinction, it must be A clear mark will be printed on the tail end of the antenna. Therefore, before customers assemble the cell phone signal jammer and antenna, they must carefully check the markings and logos of each antenna. Antennas must not be interchanged at will!