Can mobile phone WiFi jamming device be powered by DC?

During the college entrance examination and high school entrance examination held as scheduled every year, some schools will be designated as examination rooms. During the construction of standardized examination rooms, these schools will purchase and install a large number of mobile phone WiFi jammer instruments. How to solve it?

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Most of the mobile phone WiFi jammers used in the standardized test room are low-power signal blocker. Its RF transmission power is usually 2-3W for each frequency band, and the total RF transmission power of the whole machine is about 30W. The overall power consumption of the cell phone jammer equipment is roughly in the range of 120-200W. It will be equipped with a switching power supply (or a power adapter), its function is to convert the AC 220V into 5V or 12V DC, and provide power consumption for the equipment.

Because there will be dozens or even hundreds of examination classrooms in a school, the number of instruments installed is also corresponding to it. In order to turn on or off such a large number of instruments in a centralized manner, the easiest way is to concentrate the power supply of all WiFi interference instruments in each teaching building on one AC power supply line.

However, in many standardized test classrooms, monitoring systems, closed-circuit television systems, and campus broadcasting systems are installed at the same time, and these devices are usually equipped with switching power supplies. Intercept the power supply of the instrument and switch to the DC on the monitoring line? The purpose of doing this is to save a part of the switching power supply and the cost of power line layout.

This method is not advisable, the main reason is: the power consumption of each jammer instrument is not low, when using AC 220V power supply, the current in the power line is close to 1A, and multiple devices are connected in parallel on one power line , the total current value will only accumulate slowly. If it is replaced with a DC power supply, according to the conversion of power consumption, current and voltage, the current occupied by a single blocking device instrument will reach 10-20A. When multiple mobile phone wifi jammer instruments are connected in parallel on a DC power line, the total current It will reach hundreds of A, which is obviously not in line with the correct circuit usage specification.

The current bottleneck in the development of portable mobile phone signal jammers
If you look back at the hand-held portable mobile phone signal blocker ten years ago, you will intuitively feel that the handheld shielding devices at that time were so small that they could be held completely with one hand. Their hosts include antennas All sizes included, will not exceed the range of one hand. At that time, such a mobile phone signal jammer was favored by many customers. After some customers purchased it, they could directly put it in their pockets or handbags. But today, we can no longer see such a small and exquisite handheld shielding device. This is not because there is no customer demand, but the actual situation is that with the continuous upgrading of mobile phone communication technology, various manufacturers basically can no longer produce it. What are the technical bottlenecks encountered in the development of hand-held portable mobile phone signal jammers?

Ten years ago, 2G and 3G mobile phones were widely used. At that time, 4G communication technology had not yet been put into use, and 5G communication was out of reach. When there are only 2G and 3G mobile phones, or to achieve complete shielding of mobile phone signals, it is only necessary to perform signal shielding on the communication frequency bands used by these mobile phone standards. The frequency bands of wireless frequencies used by 2G and 3G are: 800MHz, 900 MHz, 1800 MHz, and 2100 MHz, a total of 4 frequency bands. If you add the standard WiFi2.4G/Bluetooth on the mobile phone, that is, the 2400 MHz frequency band, there are a total of 5 signal frequency bands that need to be shielded. From this point of view, it is not too complicated and difficult to integrate 5 signal shielding modules and supporting power boards, main control boards, power supply batteries, and transmitting antennas into a small handheld terminal.

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However, the development of mobile communication technology is non-stop. In just ten years, 4G and 5G have been launched one after another and have been widely used. However, the launch of 4G and 5G does not directly follow the original communication frequency bands of 2G and 3G, but newly enables several high-frequency frequency bands, including: 700 MHz, 1900 MHz, 2300 MHz, 2600 MHz, 3400 MHz , 4800 MHz, etc. In addition, current smartphones use dual-band wireless network technology, and the two frequency bands of WiFi2.4G/WiFi5..8G can be selected and switched at will. These newly added frequency bands are added to the 2G/ The 5 frequency bands of 3G are obvious: if a mobile phone with 5G function needs to be effectively shielded, then this mobile phone signal jammer will include at least 10-12 shielding modules.

The number of modules for shielding signals has reached 10-12, which has brought great difficulties to the manufacturers of cell phone signal jammer , especially how to miniaturize the mobile phone shielding equipment and how to minimize the appearance size , light weight, and enough battery life to meet your needs? It is not difficult to see the pain points and difficulties that restrict the hand-held and portable mobile phone signal jammers.

It is precisely because the number of modules includes at least 10-12, which is at least one more than the small equipment ten years ago, and the increased frequency band modules themselves need to have enough installation space, and the number of antennas corresponding to them must also be increase, the capacity of the battery powering it must also increase accordingly. These problems come one after another, and each problem will bring great difficulties to the portability and miniaturization of the mobile phone signal jammer.

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1. When the full-band jammer is working, why do some mobile phone signal indications still have signal?

A: This is just a false signal. In fact, at this time the mobile phone has been unable to communicate. When you make any call at will, you will find that there is no signal indication on the signal indicator, and the mobile phone can no longer make and receive calls.

2. Will the full-band jammer interfere with the normal operation of other electronic equipment?

Answer: No. This is because the electromagnetic signal emitted by the full-band signal blocker completely falls within the mobile phone working frequency band stipulated by the state, which will only block the mobile phone communication. And this signal is always in a relatively static state and will not affect any electronic equipment. If you need to interfere with other signals, it can be customized.

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3. Is the full-frequency jammer harmful to the human body and mobile phones?

Answer: Please rest assured that the electromagnetic signal strength emitted by the full-band jammer is very weak, and the test data shows that this signal strength is far from causing harm to the human body. At the same time, the full-band jammer only blocks the forward signal of the mobile phone, so that the mobile phone cannot contact the base station, so it will not cause any damage to the mobile phone itself.

4. Is there any difference in the working distance of the full-band jammer when used indoors and outdoors?

Answer: Yes. The effective distance (0-60 meters) of the full-band jammer generally refers to the indoor distance. In outdoor open areas, the effective distance of shielding can reach hundreds of meters. It should be pointed out that whether it is used indoors or outdoors, the effective distance of the jammer has a certain relationship with the environmental conditions at that time, such as the distance from the base station and the location of the installation. Therefore, when using a full-band jammer, this factor should be fully considered to avoid shielding dead angles that affect the shielding effect.

5. Does the full-band jammer have the same effect on GSM mobile phones and CDMA mobile phones?

A: This is a good question. Since the anti-interference performance of CDMA mobile phones is far superior to that of GSM mobile phones, the effective shielding distance of the full-band jammer for CDMA mobile phones is smaller than that of GSM mobile phones, but the difference is not very large, about 2-4 meters. However, users are also reminded that in some particularly important places, the number of full-band jammers in the field should be increased if necessary to ensure the shielding effect on CDMA mobile phones. Due to the same site environment, the signal strength of CDMA and GSM is different, and the shielding distance achieved will also be different.

6. After working for a period of time, the casing of the full-band jammer becomes hot. Will it damage the machine if it works for a long time?

Answer: This is a normal phenomenon. In terms of design, we use the thermal conductivity of the aluminum alloy brushed case to assist in heat dissipation. The machine itself comes with 4 cooling fans, and adopts professional circulating air design, so as to ensure stable work for a long time. Therefore, the machine case will not be damaged if it gets hot.

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What is drone jammer countermeasure technology?
With the rapid development and wide application of drone technology, the drone manufacturing industry is becoming more and more familiar. However, the potential safety hazards caused by drones have obviously increased, whether in industrial areas, in daily life, or even in the military, drones often appear. At present, social development attaches great importance to the problems of UAV jammer countermeasures. In order to ensure that regional security will not be disturbed and threatened by UAVs, UAV signal jammer countermeasure equipment has been developed.

Today, most civilian drones use GPS signals for positioning and navigation, and drone countermeasure technology can use this to realize the control of the drone that caused the accident. According to the signal received by the UAV as the standard, the drone jammer countermeasure device induces the UAV to arrive at the wrong address by covering the wireless signal from the outside world and simulating the geographic coordinates. Many areas have set up "no-fly zones" and adopted drone countermeasure technology, so that drones cannot take off or land in the "no-fly zones".

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UAV jammer countermeasure equipment is still in the developing stage, whether it is GPS signal shielding technology, wireless signal hijacking induction or some other UAV countermeasures, there is a lot of room for improvement at present. Only by continuously increasing practical activities and diligently looking for practical solutions can we quickly and effectively deal with various drone problems in future operations.

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Radio blocking equipment facing serious problems
With the rapid spread of mobile phones, there are many cases of causing trouble to other people. Cell phone ringtones can interfere with watching movies and cause discomfort. There are spectators who do not follow manners. This is a problem. There is a debate about how cell phone issues should be dealt with. Out-of-range devices will appear on the market. Widely used in countries around the world. It is a device that faces various problems. Interfering with mobile phone communications. You can prevent information leakage.

Free Wi-Fi is available in public places. WiFi uses the 2.4 GHz frequency band. A very convenient method. There are also problems. You can also easily share information. There are phenomena such as eavesdropping and theft of personal data. To solve such problems, we have developed a wifi jammer rotect your data and privacy. Designed to block wifi networks. Helps prevent leaking confidential information. It is considered the best way to protect yourself.

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The use of smartphones lowers students' grades. This is a serious problem. The teacher will explain the material. I will endure such indifference from the student side. Stop such behavior. Our site can solve this problem. There are many cheap gps jammer available. A handheld design is also available. You can easily put it in your pocket. All mobile phones cannot work in the classroom. Widespread in public places.

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