Author: 897918909@qq.com

In order to prevent internal information from being stolen by the outside world, leading to leakage incidents, confidential places have adopted many technical preventive measures, and installing 5G mobile phone jammers is one of these technical preventive measures. So how does the 5G mobile phone jammer ensure the security of information protection in confidential places? Here we discuss this issue.

It is inevitable that there may be information exchange and communication in a confidential place, and some of the data of these exchanges may still be leaked to the outside world intentionally or unintentionally through the wireless network inside the unit or the mobile phone of the on-site personnel. The most common channel leading to information leakage, and some are malicious and targeted, by installing information stealing equipment in a confidential place in advance, and then passing it to the outside in a certain way, such as through a specific frequency band Wireless information transceiver device. For these ways and means of leaking secrets, it is only necessary to select the 5G mobile phone jammer corresponding to the frequency band and keep it turned on in the confidential place, which can ensure that the information and data in the confidential place cannot be effectively transmitted to the outside world, thus cutting off the communication between inside and outside the place. Information sending and receiving channels.

For 5G mobile phone jammers installed in confidential places, the frequency bands for wireless data transmission should at least include: 2G/3G/4G/5G and Wi-Fi 2.4G, 5.8G, Bluetooth, 433MHz of all mobile phone standards Wireless data transmission, 1.2GHz wireless image transmission signal, etc. In addition, the 5G mobile phone jammer should also have a certain expansion redundancy function. When other suspicious frequency points or designated special frequency bands are found in a confidential place, the signal shielding modules for these frequency bands should be quickly added to the 5G mobile phone. Go among the jammers.

Among all the unit customers who install and use frequency jammers, schools, prisons, large conference centers and other units usually purchase dozens or even hundreds of units. This will bring about another requirement: it is necessary to carry out unified and centralized control and management of a large number of interfering terminal equipment, so the question is: Does the network version of the frequency jammer only need to have the function of switching on and off?

From the perspective of cost saving, it is of course the most economical way to realize networked remote control by adding a simple network module with only a switch function to a large number of frequency jammers. But this only realizes a function of remote startup and shutdown. Since multiple interfering terminal devices have been connected to the network through network cables, why not go further and remotely manage the network version of the interfering device? Function to play out? And it is not difficult to implement these functions, although it will bring some cost increases, but the increase is still very limited.

It is easy for customers to understand: if the remote power-on and power-off of the frequency jammer is only realized through the network, even if it can be switched on and off in groups and areas, how will the interference terminal equipment work after power-on and power-off? Is each device working properly? Therefore, the overall system must add a feedback function of the working status of the equipment! Also: There are many wireless signal frequency bands built into the frequency jammer. What is the transmit power of each frequency band? What if the distance of the interfering signal is beyond the preset range in some places? This should add the capability of remote power regulation in the interfering terminal equipment. In this way, in some places where the coverage of the interference signal is too large, the transmission power of the frequency jammer in this area can be adjusted remotely, and even the transmission power of each frequency band within it can be accurately adjusted. Only with such a function can it be regarded as a reasonable and intelligent network version of the frequency jammer solution.

Customers who are familiar with mobile phone jammers usually know that each jamming device has many antennas, and as the mobile phone system gradually develops from 2G to 5G, the number of antennas has gradually increased from the initial 3-4 to the present. 10-12 roots. Although most mobile phone jammer manufacturers have adopted the built-in installation of the antenna, there are still many customers who have questions and needs: in the expectation of improving the effect of the mobile phone jammer, is it possible to make the antenna longer and longer? it is good?

The low-power conventional mobile phone jammer is discussed here. Indeed, the most used kind of jamming device is a soft whip omnidirectional antenna with a length of about 20cm. The nominal gain value of this antenna is 2-3dB, and the standing wave frequency of the antenna is The range is from 700MHz-6000MHz. In order to unify and beautify the appearance, the antenna manufacturer uses a uniform length of rubber sleeve for the antenna. However, the real function of the antenna is not the rubber sleeve directly seen on the outside, but the antenna core inside. If the rubber cover is removed, we will easily find that the lengths of the antenna cores in different frequency bands are different.

According to the basic working principle of radio frequency signal transmission through the antenna, the length of the antenna core is inversely proportional to the frequency of the standing wave, that is to say, the higher the frequency of the standing wave, the shorter its wavelength, and the corresponding length of the antenna core also shorter. Similarly, when the frequency value of the standing wave is closer to the low frequency range, the wavelength becomes longer and longer, and the corresponding antenna core length increases accordingly.

From this, it is not difficult to draw a conclusion: in a mobile phone jammer, the antenna with the longest antenna length must be the antenna in the 700-800MHz frequency band, and the antenna with the shortest antenna length must be the antenna with frequency estimation of 5700-5900MHz. Although they seem to be the same length from the outside, the antenna cores inside are definitely different in length!

Let’s go back to the original question: Is the longer the mobile phone jammer’s antenna the better? Our answer is: In the specified frequency range, calculated strictly according to the corresponding relationship between wavelength and frequency, after increasing the length of the antenna (wire core), the gain value of the antenna is correspondingly improved, then it is necessary to improve the interference performance of the mobile phone jammer. is helpful.

Nowadays, there are more and more manufacturers producing drone jamming guns, and all kinds of products can be described as varied and refurbished. Among them, in terms of the technical parameters of the product, in addition to the continuous increase and improvement of the drone communication frequency band, the most eye-catching parameter that each manufacturer expects is the interference distance for the drone, and the marked interference distance reaches 800 meters. , there is a marked effective interference distance of 1500 meters, and what is more, the maximum interference distance of the drone jamming gun can reach more than 3000 meters. So, we have to ask here, is it necessary for the drone jammer to achieve a jamming distance of more than 1000 meters?

We can analyze this problem from two aspects:

1. In the actual application of drone jamming guns, how much jamming distance is in line with the actual needs of use?

In the actual use scenario, because the drone jamming gun has a certain direction, which determines that the user must first observe and then aim at the general direction of the illegal invasion of the drone before starting the work. Here is a very real question: what is the user’s way of viewing? In fact, most of them rely on the naked eye. Anyone who has really touched and used drones can know through some simple tests: looking for drones blindly and aimlessly towards the sky, most people can observe at a distance of 200-300 meters. Good people, from the moment the drone is released, they have been staring at the drone, and the limit observation distance in this case is only 500 meters. From this data, it can be seen that in the actual combat application of the unmanned Kurishan future extension gun, the interference distance of 500 meters has fully met the actual use requirements.

2. What are the negative effects of deliberately pursuing a larger interference distance?

It is not that the interference distance of the drone jamming gun cannot be made larger, but if you deliberately pursue a larger distance, it must be by increasing the transmit power of the jamming module, or by means of a higher gain directional antenna, but these two Both methods will increase the size and weight of the drone jammer, and there is a bigger impact: the increase in the transmit power will require a larger power supply, which will also lead to a further increase in the capacity and weight of the power supply battery. Increase.

When the size and weight of the drone jamming gun increase accordingly, it will bring a relatively uncomfortable experience to the user. It is not difficult to imagine that under the premise of meeting the actual needs of use, the user must be most willing to use the small size , Lightweight drone jamming equipment.

Some customers purchased a high-power jammer and installed it on the vehicle, but in the process of vehicle modification, in order to achieve the effect of concealed use, it is not allowed to install the antenna outside the vehicle, let alone erect it on the roof, then, Can the car jammer install the antenna in the car?

First of all, from the most favorable point of view, if the host of the jammer, the RF connection feeder, and multiple antennas are all installed inside the car, then, from the outside of the vehicle, others are completely installed inside the car. Which equipment, also completely unaware of what interference the car has. Concealed installation and the effect is very obvious!

However, when several antennas of the jammer are all installed in the car, it will bring the following negative effects:

1. The signal, coverage and distance transmitted by the jammer through the antenna will be greatly reduced.

This is because the body of the vehicle is mostly made of metal frames, metal frames and plates, which will have very large errors in the transmission of wireless signals. At the same time, the carriage is a relatively closed structure. After the radio frequency signal is transmitted, there will be several reflections inside the carriage. , resulting in that the signal will not be completely transmitted to the boundary and the range, and this part of the signal is lost in vain. At the same time, even if the antenna is erected in the car, its height is definitely not as good as that of the roof. The installation height of the antenna is different, which will also reduce the coverage radius.

2. The antenna of the high-power jammer is installed in the car. Once the machine is turned on, the contractor cannot stay in the car for a long time. This is because the distance from the antenna is too close, and the signal is reflected back and forth in the car, resulting in electromagnetic waves. The radiation intensity will seriously exceed the standard, which will inevitably have adverse effects on human health.

3. If all the host equipment and antennas of the wireless jammer are installed in the car, it will take up too much space in the car, because it is necessary to consider that the antennas of different frequency bands need to maintain a certain distance, then a car will take up too much space. The rear seats and trunk will be occupied.

Some customers are asking us about and inquiring about cell phone signal jammers, and they often ask for such functional requirements: it is necessary to perform separate interference for individual mobile phone numbers, or to open and use individual mobile phone numbers without interfering with them. This is actually our Call it a blacklist or whitelist of your phone. So, do conventional cell phone signal jammers have blacklist and whitelist functions?

The answer is very clear. As a professional manufacturer of cell phone signal jammers, we will tell you very clearly and definitely that conventional signal jamming equipment does not have the functions of blacklisting units and whitelisting.

This is because the working principle of our most common cell phone signal jammers is relatively simple. Most of the jamming signals (white noise) are amplified by the signal, pushed by power and gradually amplified, and finally transmitted through the antenna. When a mobile phone user enters the coverage area of the interference signal, for different mobile phone numbers, the interference signal is not targeted, and there is no analysis or analysis function, so the interference effect for different mobile phone numbers is to carry out the signal indiscriminately. Interference, and this indifference is not only the difference in mobile phone numbers, it will not distinguish the operator the mobile phone belongs to, nor which network standard the mobile phone is running on, such as 2G, 3G, 4G, and 5G.

Some customers will ask: Is there any cell phone signal jammer that can realize the functions of blacklist and whitelist? Actually there is. But this is not a conventional cell phone signal jammer, or it cannot be changed to such a name, and such devices can generally be classified into the category of pseudo base stations. Moreover, as a general user, a device with these functions cannot be purchased and used without permission. This must be adopted by some special departments or units licensed by our country to formal manufacturers through formal channels.

Many manufacturers of cell phone signal jammers will mark the shielding distance in their product descriptions, and this distance value is generally not marked as an exact value, usually an approximate number, or a value in an interval range, why Is there such a way of marking? Some buyers will even ask questions: Can the shielding distance of the cell phone signal jammer be accurate to 1 meter?

To understand the answers to these questions, it is first necessary to understand some basic characteristics of wireless signal transmission and coverage (distance).

The shielding signal emitted by the cell phone signal jammer is a radio frequency signal that overlaps with multiple operating frequency bands of the mobile phone. This radio frequency signal is disordered, without specific content or fixed format, which is commonly known as “white noise”. Signal. However, its signal transmission method and characteristics are in line with the characteristics of general wireless signal transmission, that is: as the signal transmission distance increases, its signal strength will gradually attenuate, and if obstacles are encountered in the transmission path, it will be affected by the material of the obstacles. The influence of characteristics and appearance size, etc., produce phenomena such as penetration, attenuation, or refraction and reflection.

However, if there are no obstacles in the transmission path, the attenuation process of the signal is a relatively continuous and smooth process. It will not appear at a certain specified distance, and the signal will suddenly attenuate a lot, or suddenly disappear completely to zero. Case.

Let’s go back to the original question: Can the shielding distance of the cell phone signal jammer be accurate to 1 meter? From the previous description, it can be known that in a visual environment without obstacles, it is definitely impossible to accurately control the shielding signal of the cell phone signal jammer to a range or distance of 1 meter. The feasible method can only be achieved by means of or using the barrier properties in the environment, and such barriers must also have a sufficiently large attenuation capacity, such as a completely solid reinforced concrete wall.

Most of the common mobile jammers on the market do not have power adjustment functions, such as those used for signal shielding in the examination room or for signal shielding in the venue, but there are still some customer groups who hope that the shielding equipment has power adjustment function. The purpose of doing this is that most of them never want to shield the signal range from being too wide, affecting or interfering with other unrelated areas from the surface. Then, for the mobile jammer with power adjustment, it is the overall adjustment or sub-band adjustment of transmission. What about power?

Looking at this problem from the perspective of customer users, the customer certainly hopes that when the operation of power adjustment of the mobile jammer can be achieved simply, conveniently and quickly. For example, the output power can be adjusted through a physical power adjustment knob. However, the very regrettable result is that such expectations are actually difficult to achieve. The way to achieve overall power adjustment with a simple knob is basically impossible.

Why is there such a conclusion? That is because the mobile jammer is composed of at least ten shielding modules according to the division of frequency bands for signals of various frequency bands and formats. Each shielding module only interferes with the signal of the current frequency band. Let’s take the mobile phone signal as an example. Even if the mobile phone signal of different frequency bands and different formats is in the same location, the signal strength it receives from the base station is actually different. The result of this difference is that the effective shielding distance of the mobile jammer for different frequency bands and different standards of mobile phone signals is also different, and sometimes the difference is very large. It is obviously inappropriate to use only one adjustable potentiometer to adjust the overall power of the mobile jammer. The correct approach must be to adjust separately for each different frequency band. This is why we can see the situation: any mobile jammer with power adjustment function has a very large number of power adjustment knobs, and the number of these adjustment knobs corresponds to the shielding module one-to-one.

Finally, we would like to add that the power adjustment of the mobile jammer can relatively precisely control the effective shielding range. However, if the user only relies on the adjustment of the power adjustment knob, it can only be a general adjustment. If you want to achieve more accurate range control, we recommend that the manufacturer of the mobile jammer carry a professional wireless signal spectrum analyzer. While adjusting the power size, use the display and analysis power of the spectrum analyzer to achieve the final ideal effect.

Some agents and distributors who undertake construction or are planning to do phone jammer project planning often need to conduct project site surveys at the beginning of the project. If they do not have sufficient experience in such similar projects, they will consult our manufacturers, among which The first question to be concerned about is: what equipment is needed for the phone jammer project site survey?

The first is the preparatory work before the project survey. The preparation items in this part include but are not limited to: the main requirements of the project demander, the main areas targeted by the phone jammer project, and the building plan, structure diagram or room distribution diagram of the project demander Wait. In addition to these, it is best to know or master the preparation information in advance, including: the distribution location of base stations around the project site, the distance of base stations, and so on.

Next is the equipment that needs to be prepared for the phone jammer project site survey. If there is a manufacturer who can assist in the site survey, then as an essential tool for signal detection and analysis: a wireless signal frequency band analyzer is definitely essential. If there is a professional engineering mobile phone with detection tools, it will be even better. If the above two points cannot be achieved, the minimum preparation requirements for the detection equipment are: prepare smart phones of several standards, and install signal detection software on the mobile phone in advance. For example, the most common mobile phone signal detection software is “Cellular- Z”. The data detected and recorded on the spot using the mobile phone signal detection software can still play a certain auxiliary role in the design of the phone jammer project.

For the phone jammer project site survey, in addition to the equipment or mobile phone software that needs to be prepared for testing, if conditions permit, it is best to prepare at least one or two mobile phone signal phone jammers, so that you can preliminarily select during the site survey process. Several test points, turn on the shielding equipment to work, check and record at these positions, the actual shielding range of the mobile phone signal phone jammer, and use this as reference data to provide a practical reference standard for future phone jammer projects .

The last thing to be reminded is that if you bring a mobile phone signal shield to the field for actual measurement, it is best to prepare a power supply terminal board with sufficient length in advance, so as to avoid finding that the power supply line for the shielding device is too short during the on-site test, resulting in equipment installation. If the height is not enough or the position is not ideal, the reference value in line with the actual shielding effect will be lost.

At the project site where the cell phone jammer is installed, if there is no professional technical personnel from the manufacturer, and there is no spectrum analyzer that is most suitable for signal analysis, can you use mobile phone software for auxiliary testing?

Use mobile phone APP software for signal testing and analysis, the most commonly used example is: “Cellular-Z”, which can obtain the reference value of signal strength, and can also obtain some basic frequency data of mobile phone base stations, and can also be used for on-site WIFI router information, GPS navigation and positioning information, etc. to read. It can play a very good reference role for on-site wireless signal environment analysis. But it must be clear that these data are only for reference, and these data cannot represent all accurate information. Why do you say so?

ecause what we need to know is: the cell phone jammer needs to shield the signal for all types and formats of mobile phone signals, and then if the data is read by the “Cellular-Z” software on the mobile phone, the signal strength you see can only be Represents the signal strength of the frequency point (or frequency band) of the mobile phone that the current mobile phone is using. However, even in the same location, our mobile phone will actually receive many signals from the mobile phone base station, that is, there will be multiple For mobile phone frequency bands, the actual result is: the signal strength displayed by the software does not represent the signal strength of other frequency bands. This results in the lack of on-site detection data. Although in most cases, the mobile phone will automatically select the frequency band (or frequency point) with the strongest local signal, but in an environment with many mobile phone users, such a rule will not exist.

If the conditions are limited, there is only the only option to use the mobile phone software to test the signal strength at the site of the mobile phone signal shielding project, because at the same time, it is necessary to take into account that the signal frequency bands of China Mobile, China Unicom, telecommunications and radio and television all need to be tested and recorded. Therefore, our suggestion is: it is better to bring a few more mobile phones, these mobile phones need to support the above four operators, and when doing on-site testing, the mobile phones need to be set in 2G, 3G, 4G and 5G modes respectively. Test and record the read signal strength values in detail.

At present, the drone jamming system has been widely used in many key military departments or important secret places, and its built-in GPS positioning jamming module is almost a necessary standard configuration. Then the question arises: When dealing with drone defense, does the GPS positioning jamming in the drone jamming system need to be turned on? If it is not necessary or necessary to open it, when is the most appropriate time to open it?

Let’s first analyze what role the GPS positioning jamming module plays in the drone jamming system. It is easy to understand that GPS positioning interference must interfere with the GPS positioning signal. Of course, the GPS positioning signal referred to here is a general term, which usually includes GPS, Beidou, Galileo, GLONASS, etc. Satellite navigation signals are collectively referred to as GPS positioning signals. When the GPS positioning signal is turned on, the drone entering the disturbed area will lose the GPS navigation and positioning signal.

hen the drone jamming system performs drone defense work, if the enabled jamming frequency band includes the drone’s flight control band and GPS positioning band, the disturbed drone will be out of control, unable to locate, Unable to automatically return to home, no real-time image transmission signal, etc., this state is generally called “drone forced landing”, and the drone will fly in disorder or free fall or even fall directly to the ground. Another situation: If only the interference of the flight control frequency band of the drone is turned on, but the interference of the GPS positioning frequency band is not turned on, the performance of most drones is to enter the automatic return mode quickly. This state is generally referred to as “drone expulsion”.

When we analyze the above-mentioned “forced landing” and “expulsion”, the customer can choose the interference mode according to the drone defense plan: when the drone needs to be captured or destroyed, GPS positioning interference needs to be turned on. module. If the defense plan only requires that the drone cannot be approached, there is no need to turn on GPS positioning interference.

There are many types and styles of current wireless jammers. After selecting and installing shielding equipment, some customers put forward certain requirements for the power-on and power-off functions of the equipment. This is not satisfied with turning on the equipment through conventional hardware switches. And shut down, so I asked this question: Is there any wireless jammer that uses mobile phone software to control the switch?

If only from the point of view of realizing the remote power-on and power-off functions of the wireless jammer through software, there are already many shielding devices with such functions. This is the wireless jammer with networked communication modules, which can realize centralized power-on or shutdown function through networking, and what’s more, can remotely switch on and off any one of the modules in the wireless jammer.

However, what needs to be explained here is that all the wireless jammers with network functions on the market at present, their networking methods are mainly three modes: the first is network networking through TCP/IP protocol, and the second is 485 The serial connection and parallel connection of the serial port protocol, and the third method is to transmit control signals from the power line through the power carrier. The first two methods require separate arrangement of control cables, and the third method utilizes the existing power supply cables.

When several wireless jammers are connected to the network, the control software can be installed on a PC or a mobile phone. The customer’s wish to control the switch wireless jammer through the mobile phone software can naturally be realized.

However, what customers need to know is: if you use the mobile phone software to control the startup and shutdown of the wireless jammer, you must know the location and environment of yourself and your phone, and you must be in the area covered by the shielded signal of the wireless jammer, otherwise , It is easy to use a mobile phone to turn on the shielding device, but once the wireless jammer is turned on, the mobile phone will be blocked by the signal, which will cause the shutdown function of the shielding device to be disabled through the mobile phone software in this case.