Relevant departments such as petroleum, chemical industry, and security have expressly stipulated that the use of mobile phones in gas stations is prohibited.

　　The equipment of the gas station is controlled by the computer. The signal of the mobile phone will affect the normal operation of the equipment, resulting in inaccurate measurement. More importantly, the mobile phone will spark during the dialing process, which can easily cause a fire and cause the gas station to explode. Therefore, the gas station that belongs to the fire prevention area is not only strictly forbidden to use mobile phones in the station, but also it is best not to use mobile phones within two or three meters around the gas station.

　　At the same time, gas stations should set up obvious signs prohibiting cell phone calls, and widely publicize safety knowledge, so that people understand that using signal cellphone jammer in gas stations is undoubtedly walking with tigers. There have been many fires caused by the use of mobile phones across the country. In a gas station, the driver used a mobile phone when refueling, which caused an explosion and caused a serious accident that caused many casualties.

　　At present, the mobile phone signal is almost everywhere, and all electrical equipment is surrounded by it. When the mobile phone signal amplifier is not used, the interference of the surrounded signal to other electrical equipment is minimal. This is because there is no data exchange between the mobile phone and the base station when the mobile phone is not used, and it is impossible to form a sudden change. signal, electrical equipment is surrounded by a relatively stable electromagnetic field, that is, a static electromagnetic field, the interference of this static electromagnetic field to electrical equipment is almost zero. Therefore, it is absolutely necessary to use a mobile phone gps jammer in the gas station.When using a mobile phone, there is data exchange between the mobile phone and the base station, and random mutation signals are generated, so that a dynamic electromagnetic field is formed around the electrical equipment. This dynamic electromagnetic field signal will induce mutation interference signals. cause malfunction of electrical equipment. When the cell phone battery starts, when the ringer rings, it can generate enough energy to cause a slight spark that can cause a fire.

　　why is it forbidden to make phone calls at gas stations?

　　As we all know, gas stations dealing with flammable and explosive materials are high-risk industries, and "safety first" is the most basic requirement for gas stations. Common safety measures at gas stations mainly include turning off motorcycles to refuel, gas station employees must wear anti-static clothing to work, prohibiting open flames and using mobile phone calls in gas stations, and not refueling in plastic buckets, etc. One of the more difficult to manage is the prohibition of customers using mobile phone calls in gas stations mobile signal jammer.

　　First of all, people have misunderstandings about the safety hazards caused by using mobile phones in gas stations. Why can't you make phone calls in the gas station? Some people think that it is alarmist that a mobile phone can cause an explosion at a gas station, and they have never heard of an explosion caused by a mobile phone. In fact, there is a certain scientific basis for mobile phones to cause explosion accidents.

　　As a radio communication tool, the mobile phone emits radio waves, which can induce radio frequency currents in the antenna that receives the radio. When RF current circulates between metal conductors, RF sparks will be generated in case of corrosion or poor contact. As long as the RF spark lasts for more than one microsecond and the energy is greater than 6 milliwatts, it will ignite the methane-air mixture. Since gasoline is a volatile substance, in the combustible danger area formed by the leakage of oil and gas tanks and natural gas pipelines, the radio frequency sparks generated by mobile phones can easily cause explosions and lead to disasters.

　　When the gas station fills the fuel tank of a car or motorcycle with gasoline through a fuel gun, the oil and vapor in the original empty fuel tank will drift outward, and the newly injected gasoline will also volatilize into the air, causing the density of the fuel and vapor around the refueling vehicle to increase sharply. At the same time, in order to make the communication signal clearer, the frequency of mobile phone use is very high, and the transmission power is relatively strong. Although it meets the national standard, it still poses a serious threat to refueling and gas stations. Because refueling and gas stations are now generally controlled by computers, high-intensity mobile phone signals will cause induction with computer equipment, and the instantaneous electronic friction between the two may ignite fuel vapor and cause an explosion. The current required to ignite the fuel gas is very small, and the static current generated by the mobile phone in the working state can completely reach this limit. If you encounter cloudy or foggy weather with high air humidity and low air pressure when refueling or unloading oil at the filling station, due to poor air circulation, the density of oil and vapor will increase accordingly, and the possibility of explosion caused by receiving a mobile phone will further increase. big.

　　In addition, because the mobile phone itself does not have explosion-proof function, if the mobile phone is used for a long time or the quality of the mobile phone itself is poor, the circuit of the internal chip of the mobile phone is prone to short-circuit, so that the mobile phone can generate a small amount of sparks at the moment of answering, thereby also Can cause an explosion at a gas station.

　　Secondly, there is only one way for customers to use mobile phones in gas stations. At present, the main way for gas stations to prohibit customers from using mobile phone calls at gas stations is to persuade, but sometimes the effect of persuasion is not ideal. On the one hand, the customer does not know the safety management regulations of the gas station, and believes that it is unnecessary for the gas station employees to let them use their mobile phones in the gas station, which is prone to rebellious psychology. On the other hand, the customer knew that he could not use the mobile phone in the gas station, but he was lucky, and one-sidedly believed that the accident would not happen when he was using the mobile phone, so he did not listen to the persuasion of the gas station staff and went his own way.

　　It is not uncommon for car owners to use mobile phones in gas stations. Gas stations should be prepared for danger. They should not turn a blind eye to this phenomenon and let it go. Effective measures should be taken to eliminate potential safety hazards and jammer gps buy ensure the safety of gas stations.

　　How can I check if someone has a jammer gps in the car?

　　Method 1: In non-metallic environments (such as houses, human bodies), metal detectors can detect, but some monitors and locators have almost no or no metal parts, and metal detectors cannot detect them, so this method has limitations .

　　Method 2: The use of radio signal detectors can detect bluetooth, wifi jammer, and mobile phone communication signals, and monitors and locators will also emit such signals when they are working, so they can be detected.

　　Strictly speaking, vehicle anti-monitoring and anti-tracking is a comprehensive professional discipline. It integrates communication engineering, radio technology, electromagnetic research, information science, network security, psychology and other disciplines.

　　The method of shielding the vehicle locator signal:

　　1. If you want to block the GpS locator on the car, you must first look at the size of your car model, and then choose the corresponding power blocker. In addition, there are various GpS signal blockers on the market, and there are many types, so how do you distinguish them? How to choose an effective shield is very important;

　　2. Some people think that as long as they buy a GpS blocker, they can block the positioning. In fact, this is not the case, because the positioning includes satellite positioning and base station positioning in addition to GpS, so it is necessary to buy all shielded equipment to be effective;

　　3. This type of jammer gps can basically be powered by the cigarette lighter, so after being installed in the car, it must be ensured that the jammer gps is always in working state. If the car turns off halfway, the jammer gps will definitely be powered off, then the location information of the car will be exposed again. Therefore, it is recommended to connect the power of the shield to the battery of the car as much as possible to ensure that the device can work continuously.

　　In recent years, with the rapid development of mobile phones, it is not uncommon for students to use mobile phones to affect their life and learning. Some students often use their mobile phones to surf the Internet in bed, and some even use their mobile phones to surf the Internet in the middle of the night. It is still one or two o'clock, so in order to prevent students from playing mobile phones in the middle of the night and give themselves a better rest, many schools have to choose to install wifi jammer in their dormitories.

　　So is it enough to put a high-power mobile phone jammer? Is every room in the school dormitory like a school exam room? Actually, how to select and install it is explained below. The cell phone signal jammer gps in the school dormitory are mainly used at noon and evening when students are resting. Noon is generally 12:00 to 1:30, and evening is 11:30. until 3 am. That is to say, there is no need to shield the mobile phone signal 24 hours a day, so the shielding device of the ordinary power supply such as the external adapter is also optional.

　　The wifi jammer gps can be big or small, and there are many channels in any frequency band of mobile communication. They are technically channels, and both channels can be used as BCH. For example, in the case of masking, there is uncertainty even in some cells.

　　The scope of cell phone signal jammers is limited to classrooms and dormitories. Obviously, the school's behavior is mild and does not affect students' freedom of communication and expression. The exercise of any right is limited and must not prejudice the rights of others or the public interest. The freedom of communication and speech that citizens enjoy in accordance with the Constitution and the law shall not exceed their due scope.

　　Test the effect of wireless signal jammer

　　When American College Test uses a wireless signal jammer, the installation is a very important content. If the control is appropriate, it is basically certain that there will be a very good shielding effect. However, if there is a problem in the deployment and control, it is easy to have a blind corner of the shielding, so the effect of the shielding is greatly reduced.

　　Speaking of which, the reason why American College Test installed a wireless signal blocker is actually to block the signal of the mobile phone, so at this time, we only need to use the mobile phone for testing and there is no problem. However, in this process, there are some points that need to be paid attention to. First of all, we need to prepare enough mobile phones. Because the frequency of each

　　mobile phone is slightly different nowadays, the inspection can only be completed by ensuring that each type of mobile phone is blocked. Secondly, the mobile phones we use should also be comprehensive in terms of operators. The mobile phones we will use every day, AT&T, Verizon, and T-Mobile mobile phones should be prepared for testing to ensure that everything is safe.

　　In addition to preparing a sufficient number of mobile phones, we also need professional help when testing. Many people may think that the detection is to see if the mobile phone has a signal, and we can do it ourselves. However, after the wireless signal jammer is installed, the impact range is very large, and many parts may have blind spots for shielding. It is obviously unrealistic for us to try one by one. professional staff will know which corners are prone to blocking dead corners because of their rich experience, so that they can effectively prevent loopholes during detection, and the overall efficiency will be higher.

　　Finally, when you are testing the mobile phone of the mobile signal jammer, don't think that the shielding has been completed when the number of mobile phone signals has completely disappeared. In fact, in many cases, the mobile phone has no signal grid number but still can transmit information. At this time, it is best to take intermittent calls to determine whether the phone is really blocked.

　　Mortgage car has also become a kind of automobile consumption. Some tens of thousands of Dollars have bought luxury cars such as Land Rover, Mercedes-Benz, and BMW. Why? Of course it's because of the affordable mortgage car.

　　The original car owner mortgaged his luxury car at a low price because he needed money urgently. If the capital turnover still does not exceed the deadline, he will lose the ownership of the car. Mortgage agencies ultimately want money, not physical objects, so they all choose to sell the car. As a result, consumers who buy a mortgage car have the opportunity to buy a luxury car at a low price.

　　Of course, buying a mortgage car also has risks. In addition to lack of understanding of whether the original car has failed or had an accident before, the biggest problem is worrying that the car is equipped with a tracker or locator. If you buy it back to your home, the original owner will find it and drive it away secretly, and turn on the mini gps jammer. Isn't it a big loss?

　　In the same way, after getting the owner's vehicle, the mortgage agency will also worry that the owner will find a parking place and quietly drive the car away.

　　How to solve this problem?

　　When the GPS jammer is installed on the vehicle and it is turned on, it will cut off the signal sent by the tracker hidden on the vehicle, so that others cannot locate the vehicle and cannot find the specific location of the vehicle.

　　In addition, the GPS signal blocker has the difference between a handheld small and a plug-in large, both of which can block mobile phone signals jamming wifi and GPS signals.

　　There is a growing demand for cell phone jammers in the market. The most common one is the cell phone jammer system that appears in various exams, including the American College Test and civil service exams, where the popularity of wireless signal shielding is often noticed. and effect. In order to achieve fairness in exams, mobile phone signal jammers are now selected to block the signal in the exam room during most exams around the world.

　　In order to strictly prevent candidates from cheating using high-tech electronic devices such as mobile phones, it is decided to no longer tolerate the behavior of criminals using radio equipment to cheat during the American College Test. The radio emergency command network and new radio monitoring equipment will conduct radio supervision on the American College Test throughout the process.

　　Some test rooms will be equipped with cell phone jammers for the first time to ensure that there is no communication signal in the test room. In the previous simulated American College Test radio cheating site, the technicians of the joint security team dispatched a mobile radio monitoring vehicle to monitor the examination room and its surrounding areas, to find the location of the interference source of the cheaters, and to monitor whether there were any suspicious signals. After finding the suspected cheating signal, the technicians will start the radio intelligent monitoring and warning system to technically block it, and at the same time use the portable radio monitoring equipment to locate the signal jammer device, so as to quickly find the cheating criminals.

　　"Once the surrounding geography is complex and it is difficult to find the signal source in a short period of time, the intelligent monitoring and warning system can take various measures such as voice suppression, interference signal suppression, and background noise suppression for cheating signal sources, so that candidates in the examination room cannot hear the examination room. The answer is transmitted from outside to the test room to ensure the fairness and impartiality of the test in the shortest time." This application of cell phone jammer can be described as a very successful.

　　The successful completion of the American College Test work is inseparable from the high-quality anti-cheating tool-cell phone jammer.

　　If the mobile signal jammer is installed in an outdoor environment, it must take waterproof and lightning protection measures. Generally, it is
recommended to select a special installation box for the cell phone signal jammer. The louvered ventilation position (enhanced heat dissipation), the
opening on the top of the box extends out of the antenna of the mobile phone shield (the hole is sealed with hot melt adhesive), and the bottom of the
box has a power input hole and a diversion hole (to prevent water accumulation).

　　When the mobile phone signal jammer (together with the installation box) is installed outdoors, such as installed on the outer wall of the building,
it is necessary to take lightning protection measures. Especially in thunderstorm-prone areas, you should pay more attention!

　　The main unit of the mobile phone signal jammer is installed on the top of the box, the antenna extends out of the box (if it does not extend out of
the box, the shielding effect will be greatly reduced), and the power adapter should be placed in the middle and lower part of the box.

　　Lightning protection measures are actually to install lightning rods on the shielding device. If there is no ready-made lightning rod to buy, you can
make your own lightning rod. The method is as follows:

　　Choose 3-4 steel bars with a diameter of 5-10mm and a length of 50cm, sharpen one end into a needle shape, and weld the other end together to form a
"Y" shape. The welded end is connected to the ground with an iron wire with a diameter of 2-3mm (The iron wire is protected by PVC pipe penetration), and
the end of the iron wire to the ground is connected with an iron strip. The iron strip is generally about 50-100cm long and 2-5cm wide, and is deeply
driven into the ground. If the iron strips are hard to find, you can use 10mm steel bars instead.

　　The lightning rod is installed 30-50cm above the antenna of the mobile phone signal jammer. The lightning rod (including the grounded steel wire)
cannot be in contact with the mobile phone jammer or the installation box, and the distance should be properly maintained.

　　The main functions that GPS satellite positioning system can achieve in civilian use are:

　　Call traffic command function; the command center can monitor the running status of vehicles in the area and reasonably dispatch the monitored vehicles. The command center can also communicate with the tracked target at any time to implement management.gps jammer can be detected and located by mobile direction finding systems. Spectral analysis to determine the duration and signal type of interference can also be used to indicate whether the interference is accidental or intentional.

　　Route navigation function; providing travel route planning is an important auxiliary function of the car navigation system, which includes automatic route planning and manual route design. The automatic route planning is that the driver determines the starting point and destination, and the computer software automatically designs the optimal driving route according to the requirements, including the calculation of the fastest route, the easiest route, and the route with the least number of highway sections. In manual route design, the driver designs the starting point, ending point and waypoint according to his own destination, and automatically establishes a route library. After the route planning is completed, the display can display the designed route on the electronic map, and at the same time display the vehicle running path and running method.

　　Vehicle tracking function; the actual position of the vehicle can be displayed in real time using GPS and electronic maps, and can be zoomed in, zoomed out, restored, and changed at will; it can move with the target to keep the target on the screen; Vehicle, multi-screen simultaneous tracking. Use this function to track and transport important vehicles and goods.

　　Information query function: Provide users with databases of major objects, such as tourist attractions, hotels, hospitals, etc., users can display their positions on the electronic map. At the same time, the monitoring center can use the monitoring console to query the location of any target in the area, and the vehicle information will be displayed on the electronic map of the control center in digital form.

　　As 5G systems move into frequencies used by GPS, interference is likely to become more widespread. The key point is that civilian signal jammers are completely open, they are not encrypted, they are not authenticated, they are completely open and completely immune to spoofing attacks.

　　GPS satellite positioning system has added a lot of convenience to our life, but it has also brought some troubles, which even threaten the personal safety of individuals.

　　1. The location information of the vehicle can be easily obtained by others; it is only necessary to load a specific GPS positioning device on the vehicle body to obtain the vehicle location information in real time. This function is widely used in the automobile transportation industry and the financial loan industry. In fact, this is also certain. Personal privacy is violated to a certain extent.

　　2. Personal location information is also easy to steal; current location trackers have become smaller, lighter, and more accurate, making it easier for some criminals to steal and spy on the location of others. Health status.

　　Professor Langdon checks GPS tracker in The Da Vinci Code

　　The GPS tracker featured in the 2006 movie once raised questions from professionals—at the time, such a small tracker was impossible.

　　As technology advances, the smallest GPS tracker is only a centimeter long, yet its performance is more responsive than ever. Ultra-small GPS trackers will soon go from fiction to reality.

　　The evolution of technology toward smaller and more sophisticated technologies has made GPS tracking more useful for personal privacy theft in addition to commercial espionage.

　　In order to combat the trouble of tracking and positioning, there is GPS jamming.

　　GPS jamming is a relatively simple technique that requires only generating an RF signal strong enough to overwhelm GPS satellite transmissions. The subject of a GPS jamming attack will immediately realize that there is a problem because the system will not be able to generate geolocation results.

　　MIT graduate student Limor Fried called her portable jammer a "bubble." GPS cannot enter this bubble for the purpose of reclaiming private space.

　　It's not actually a bubble, it will interfere not only with private spaces or cars, but also with innocent GPS receivers for miles around you. People worried about cracking down on tracking probably won't be uncomfortable with opening the radio bubble.

　　No matter what the goal of the portable jammer is, the device doesn't treat it differently, so there's usually additional collateral damage. Air traffic control (ATC), search and rescue operations, power grids and mobile phone services are all vulnerable to GPS interference.

　　The London Stock Exchange suffered repeated GPS outages, affecting the time stamping of financial transactions. In 2007, an outage in GPS communications at the Port of San Diego prevented residents of the city from withdrawing cash from ATMs, and it took them three days to determine the cause of the ship's drill.