Category: Tag Prison

As we all know, criminals are not allowed to use mobile phones in prison. In fact, this problem exists in many prisons around the world, it is necessary to impose a mobile phone ban on the prison. Prisoners have secretly contacted the outside world through their mobile phones and committed crimes again. This phenomenon has been around for several years. In order to solve this problem, a special high-end military jammer must be installed in the prison to isolate all external information, so that they cannot communicate with the outside world in the prison and indirectly prevent the occurrence of crime.

Talk about the summary of experience when installing jammers in prisons

A. Most prisons have guard towers and observation towers to protect prisoners. The height of the towers is mostly higher than the prison buildings. If the antenna height is higher than the tallest building, it will be easier to block cellular phone signals in the air. Therefore, it is very easy and more protective to install the prison shield on the observation tower. Moreover, engineering costs can be greatly saved. The installation process can be improved.

B. If there is no prison guard tower or its use is not allowed, we suggest that you can choose a fence. If the height of the wall is higher than the tallest building, solution a can be used. If the wall is lower than the tallest building, a fixing bracket must be installed on the wall. The height of the support must be 3 to 5 meters higher than the tallest building in the prison. The higher it is, the easier it is to install the antenna. In this way, the construction cost will be higher than solution a. If it is a larger prison, more shields must be installed to adopt solution a and solution b. We recommend installing wireless jammer with omnidirectional antennas on some buildings in the middle of the prison to increase the shielding range and reduce the amount of interference.

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C. If all guard towers, prison buildings and fences in the prison are not allowed, we must recommend the construction of some fixed cylindrical towers or signal towers. Engineering costs will be more difficult and expensive. The whole building will be much slower. To some extent, once other solutions cannot be adopted, this is our last choice.

Tip: If you use plan B and plan C, please pay attention to install lightning rods. The height of the lightning rod must be 2M higher than the antenna. jammer-mart has many years of experience in the installation of signal jammers in prisons. It is also very experienced in projects in other places. At the same time, you can choose the jammer products that suit you on our website.

The un-fictionalization of cell phone jammers

Ten years after the then fictional invention (in our column in Byte magazine) of the A Brief Cell Phone Jammer, the New York Times reported on November 4, 2007 that the device is now pretty real? and that it’s used by people who like to use it: there seems to be a lot of stuff out there.

Andrew reached into his shirt pocket and pressed a button on a black device the size of a cigarette pack. It sent a strong radio signal that interrupted the imposter cell phone transmission? and everyone else within a 30 foot radius.

She talked into her cell phone for about 30 seconds before realizing that no one on the other end was listening? he said. His reaction when he first discovered he could wield such power? Oh holy Moly! Liberation.?

As cell phone usage has skyrocketed, making it difficult to avoid half a conversation in public places, a small but growing group of rebels is turning to a blunt countermeasure: the cell phone jammer, which knocks out nearby cell phones.

armband signal blocker

Here is our description written in 1997. The device was called “apoptosis”:

The word “apoptosis” comes from biology: It means “programmed cell death”. What is so wonderful about apoptosis? Just like that: it interrupts any cell phone call within earshot of you.

Apoptosis has an effective range of 15 feet – wide enough to get the job done, narrow enough not to disrupt innocent neighbors’ phone lines.

Apoptosis is small and inconspicuous. It fits on a keychain. It looks like a worry pearl. If someone nearby starts to snap, snap, snap a cell phone, you just assume an innocent expression, squeeze your little “worry pearl” and see immediately that your wish is coming true: the idiot’s cell phone connection dies.

Right after the column came out, readers bombarded us with questions about where to buy it? oh, then-fictional? Product. The first non-fictional cell phone jamming products (as far as we know) came out a year later, in 1998, from a company in Japan and another from a company in Israel. The Times article mentions a company, https://www.jammer-shop.com/de/, that now sells a variety of such devices.

Men’s basketball game reporters restricted due to negative closing venue signal shielding

The 12th National Games enters the final day, and the competition will end today. The closing ceremony of the current National Games will also be held at 4 pm today. According to the notice received by the National Games Propaganda Department last night, the men’s basketball finals interview reporters will implement a quota allocation system, and the closing ceremony will use cell phone signal jammer for communication control.

Powerful signal jammer device

Not long after the men’s basketball semi-finals ended on the evening of the 11th, around 22:00, many reporters covering the National Games received a text message. This official notice from the National Games Propaganda Department stated: Adopt reporters to implement a quota allocation system” and attach the phone number of the forecast name.

The phone of the media director of the Tiexi Gymnasium in Shenyang Division instantly became a “hotline”, and the incoming calls were almost unbroken. More than 50 calls came in within an hour. And these reporters have only one purpose, which is to win interviews for tomorrow’s men’s basketball final.

According to the person in charge, according to the notice issued by the superior, there will be only 20 photojournalists in the men’s basketball final at 13:00 tomorrow, and the relevant photo vest must be obtained to enter the infield. At this time, it is almost impossible for reporters who call to make an appointment to get another photography spot. They can only “register first, and then see the situation.” Regardless of whether it is from the central government, the Liaoning and Guangdong sides in the finals, other provinces, cities, and even Hong Kong, Macao and Taiwan reporters, they can basically get the quota of journalists.

For such a difficult situation, the person in charge is also very embarrassed. “That is 20 places. Xinhua News Agency and CCTV will account for one half. Other mainstream media such as Liaoning and Guangdong will also Give priority to it, so I can only ask media reporters to understand.”

Immediately afterwards, the National Games Propaganda Office issued a notice on the closing ceremony interview. The original text read: “On September 12, during the National Games closing ceremony, communication control will be implemented on the closing ceremony venues, and mobile phone calls cannot be made in the venues. , You can’t use your mobile phone to access the Internet. Please understand that this will cause inconvenience to your work.”

When the reporter called the relevant person in charge of the Propaganda Office, the news was confirmed. As for the consideration of “communication control”, the other party’s initial response was “just received a notice from the superior, and it is not clear.” But then, the Propaganda Office replied: “The main reason for communication control is to worry about malicious hype about the National Games during the closing ceremony, hoping to guide positive reports on the National Games.”

Detention center mobile phone signal jammer solution

In order to meet the needs of the new situation, improve the scientific and technological prevention capabilities of the detention center, strengthen the scientific and technological management level of the detention center, promote the construction of digital information detention center, promote the harmonious and stable development of the detention center, and continuously improve the modernization level of the detention center work, it is necessary to scientifically and effectively monitor the mobile phone signals in the detention center. Control and prevent the hidden dangers caused by illegal use of mobile phones.

The establishment of a cell phone signal shielding system in the detention center complies with the relevant regulations of the Ministry of Justice and the spirit of the document. At the same time, it also has an urgent need. During the implementation of the mobile phone signal shielding system in the detention center, the shielding of the internal area of the building should take into account the distance between the residents (schools) and other public facilities in the area where the building is located, and also refer to the distance and signal strength of the surrounding communication rack base stations. Affect the normal communication of mobile phone signals in surrounding public facilities for network shielding.

22 Antennas Wireless Signal Jammer

At the same time, the requirement for full coverage and shielding of mobile phone signals within the detention center should also be considered. Outdoor high power jammer can be used for inward coverage of wall coverings to ensure the shielding of mobile phone signals in all areas. At the same time, it is aimed at possible blind spots in the detention center building , The missing point is used to repair the mobile phone signal jammer, so as to give full play to the product performance and greatly improve the jammer effect.

Product features of cell phone signal jammer:

1. Six-channel cross-shielding to achieve the best shielding effect. The shielding includes GSM, CDMA, DCS, PHS, TD-SCDMA, CDMA2000, WCDMA, 4G

2. Effective segmentation, only interferes with the downlink, and does not cause interference to the base station;

3. The power indicator light on the fuselage is so that the height of the suspension is higher than the line of sight range, and the shielding work can also be understood through the indicator light below.

4. Imported chips to ensure quality and stability;

5. Built-in power supply to prevent malicious damage by criminals and ensure the life of the machine;

6. Dual-channel metal industrial switching power supply, truly realizing uninterrupted and sustainable work;

7. Low-power machines, green and safe, do not pose a threat to health.

How to inhibit the signal of a mobile phone?

The technology to inhibit a mobile phone exists and, if one has the soul of a saboteur, it can be purchased on the Internet for a few tens of dollars in the market. A frequency jammer consists of a small device that emits an electromagnetic wave that cancels the frequency of the mobile phone in an area of tens of meters. Their use is usually restricted by law since they are used by state forces for protection work or by organized gangs of thieves in the theft of vehicles or houses.

There is also the possibility of acquiring the technology for the opposite. A frequency inhibitor detector allows detecting a burglary attempt when intruders want to disable an alarm in a home for example. It is a service that alarm companies market, reaching the contradiction that they sell it as an additional service to cover a vulnerability in their own protection systems.

newest hidden mini cell phone interference

The mobile phone jammer not only work for mobile telephony but can also cancel the WiFi signal, GPS, radio, road radars, etc. But not all electromagnetic signals are equally easy to inhibit. Communications that use several radio transmission channels at the same time are more robust to attacks.

The inhibition of electromagnetic signals is very close to listening or spying on communications, reaching its maximum expression with the so-called ECHELON network that brings together English-speaking countries in an immense global communications listening network. It was conceived in times of the cold war and continues to be used to fight terrorism and industrial espionage, causing suspicion in civil society for its lack of legality and transparency.

Raspberry Pi 4 HDMI is interfering with its own WiFi

Upgrading a popular line of products may sound like a good idea, but adding bigger / better / faster parts to an existing product can lead to unforeseen problems. For example, putting a more powerful motor in an existing vehicle platform seems to work at first until people report that the increased torque is bending the frame. In the Raspberry Pi world it seems that the “updated engine” in the Pi 4 causes the WiFi to stop working under certain circumstances.

Enrico Zini noticed this problem and tried to reproduce exactly what caused the WiFi to fail. After testing various Pi 4 cards, power supplies, operating system versions, and a host of other variables, the cause was isolated on the screen resolution. Apparently the WLAN fails with the setting 2560 × 1440 with HDMI. While you might think that a SoC might not be able to handle high resolution, WiFi, and everything else that tiny computer has to do all at once. However, the root cause seems a little more interesting than a simple problem with system resources.

Mike Walters checked for a radio frequency problem with a HackRF on a Twitter post on this issue. It turns out that at this screen resolution, the Pi 4 emits RF noise that is exactly in the range of WiFi channel 1. It appears that the Pi 4 is acting as a wifi jammer for itself.

This story is pretty new, so hopefully the Raspberry Pi Foundation is aware of the problem and is working on a fix. For now, however, it might be best to use a slightly lower resolution if you encounter this problem.

Are all wireless networks susceptible to interference?

There is a lot of buzz about enterprise access networks being “fully wireless” as the increased throughput and range of next-generation 802.11n WLANs become available in IEEE standard products.

One consideration for using unlicensed radio waves solely for corporate LAN access is the impact of interference on network availability. Jamming is a form of wireless denial-of-service attack in which a single device transmitting at a higher power than those nearby blocks the connection to lower-powered devices. If you put all of your broadcast eggs in one wifi basket, a malicious paper jam can bring your access network to its knees.

Fortunately, to date we haven’t heard much about deliberate, unintentional jamming attacks on any particular company or hot spot. But once businesses go wireless, I wonder if that raises serious security concerns.

Inadvertent interference is common in cell-based Wi-Fi network systems. It emits from bluetooth devices, microwave ovens, cordless phones, Wi-Fi access points in a neighboring office, and other competitors for unlicensed spectrum. You can use spectrum analyzers such as those from Cognio and its many resellers and OEMs to identify and locate such sources of interference. Basically, you then use Ankle Express to deactivate them.

gps wifi cell phone jammers

But what if criminals come into play? jammer device exist today primarily for legitimate testing purposes. If the jammer is within FCC Part 15 power limits – 1 watt plus 6 dBi antenna gain, or around 4 watts – a legitimate device can easily broadcast most Wi-Fi devices, which typically emit around 100 milliwatts of power Craig Mathias, Principal at Farpoint Group in Ashland, Mass.

“There are a number of jammers on the market that can completely shut down 802.11,” says Mathias. “You need some kind of radio that can pinpoint where the radiation source is coming from. If the jammer is illegal [broadcast at levels above FCC limits] it can be distant and difficult to fix.”

Portable jammers are particularly convenient for some special groups of people

It’s really boring to be tracked now. There are various tracking devices that disrupt the lives of normal people. Although it’s really convenient, it can also harm people and bring them privacy threats. Now, if you If you want to get rid of this situation, then you can come here and you will find that jammer-mart is a good choice, and you can find the best here.

Mobile phone select Bluetooth mobile phone signal GPSL1 GPSL2 GPSL5 3G jammer View product table

And the normal use of many wifi signal jammer and tracker on the market are cell phone signal trackers and GPS trackers, so if people need to cut off GPS from signal tracking and cell phone trackers, you can directly come here to view this feature design For specific examples, you can come here to learn more about this “Portable Signal Option Bluetooth 3G Mobile GPSL1 GPSL2 GPSL5 Jammer”, and you can see the detailed information of this 3G mobile GPS jammer.

smartphone signal blocker

Then, you can briefly take a look at this optional portable signal jammer. This handheld WiFi 3G GPSL1 GPSL2 GPSL5 blocker has the function of cutting off GPSL1 GPSL2 GPSL5 signals and 2G 3G WiFi cell phone signals at the same time. However, when using other designs, you may have to make a real decision based on the interference of the frequency band. Therefore, since this optional 3G Bluetooth GPS phone also includes a stuck car charger, it is also a good choice for people who want to use GPSL1 GPSL2 GPSL5 3G Bluetooth mobile phone jammer.

In addition, the portable GPS mobile phone blocker also has a built-in fan. Due to the heat dissipation system, the GPS signal of the handheld mobile phone always maintains a good working condition and will not cause high temperature. In addition, the portable handheld GPS signal blocking device is also designed with a car charger, which can be conveniently used in the car, which is very convenient and easy to use. In addition, the GPS jamming application is also very easy to use and can be used in many places where you go out as well as meeting rooms, classrooms and other places.

In addition, there are many other types of portable signal jammers, they are designed to have this function, if you need a 3G GPS mobile phone jammer or other types of signal blockers, please sell them here.

Car theft: jammers, a new weapon for car thieves

This is not a rumor or even a potential risk (like a security breach), but a reality: car thieves have a new way of behaving and it’s unfortunately very simple and very effective. The National Police released an official press release on May 19, 2020 warning of “frequency jammers” that allow thieves to block the automatic closing of car doors … to safely search or steal them.

A simple, inexpensive box for a few tens of euros

The signal jammer is neither complicated nor large: it fits in one hand and only blocks the signal that the remote control sends to the car when the doors are closed (automatic remote locking). The signal is encrypted, the car remains open.

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What worries the authorities is that it is extremely easy to get this type of jammer on the internet and in parallel markets. Their prices also make them dangerous: barely fifty euros or accessible to everyone. Suddenly their shadow multiplies in Ile-de-France and all over France.

The only solution: vigilance

If the police can watch, they arrested three young people in the act on May 12-15, 2015. The number of cars and jammers in circulation is far too many for the police to check. And there is nothing to be done about these boxes.

To do nothing except … be vigilant as always. The problem is that with a remote lock you are more likely to trust not to check that the doors are actually closed: generally, you press the button as you step away from the vehicle and without returning.

But thieves watch with their boxes. However, if you are vigilant and check that the doors are actually closed, there is nothing they can do: if they are not closed, you can always press the button again to close them or stay near the vehicle while they are closed are not close.

Fight against employees who use GPS jammers

From the paranoid conspiracy nut to the woman who is afraid of being followed by the employee who doesn’t want to be followed by her boss, the use of devices called GPS jammer is increasing. They are easy to purchase online. You can even find them on sites like eBay. Many people who use them likely assume they are legal and don’t bother to investigate the laws around them. But as an employer, how do you combat and spot employees who use GPS jammers?

gps jammer

What is a GPS jammer?

What Exactly Is A GPS Jammer And How Do They Work? A GPS jammer is a device that uses radio frequencies to transmit a signal that blocks, interferes, or interferes with GPS systems. These devices interfere with all aspects of GPS, including navigation and tracking.

The devices are usually small and most of them are easy to install. A user just needs to plug it into the lighter or car charger port (do cars still have a lighter socket?) And make sure the device is near the GPS tracker so it can interfere with the signal. It takes less than half a minute to turn them on, which makes them attractive to criminals and employees as you can simply plug them in when needed and remove them for the rest of the time.

How do I know an employee is using a GPS jammer?

The good news is, if you have one or more employees trying to use a GPS jammer to disrupt your fleet tracking system, you know. While your drivers may think the illegal jammers are making them invisible, they are instead paying more attention to their behavior.

When an employee uses a GPS jammer to jam the GPS signal, it will show up on the live tracking map or trip history map as a paused or missing trip. If you only connect your jammer during part of the journey, a line will appear between when the jamming started and when the device was turned off. Some later GPS tracking devices even have GPS interference detection. You can also create an exception rule that checks for GPS signal errors and triggers an alert or email when GPS interference occurs.

Once you discover that an employee has disrupted the GPS tracking, you can confront them. They also have a record of the GPS malfunction for disciplinary action like firing the abusive employee for cause.

Final thoughts on GPS jammers and staff

While GPS jammers are illegal, the devices are inexpensive and easy to obtain, especially online. The FCC relies heavily on the public to report the devices, but many people are unaware that it is illegal. Studies of the number of drivers using GPS jammers to hide their whereabouts from employers are inconclusive. However, their use appears to be increasing.

While most GPS jammer users are unlikely to use them to hide illegal activity, the reason behind buying, selling, or using the devices illegally is for public safety reasons. GPS jammers interfere with communication systems, navigation systems, and tracking systems, including emergency services and aviation.

It’s interesting that workers who use them think they can fool their bosses. Instead, employers can easily monitor when and if an employee is using GPS interference and record all incidents. If you are concerned that your drivers are tempted to use the devices, it is important that you monitor your reports and confront the staff who catch you.

You can also let your drivers know that GPS jammers will not help them hide from GPS tracking and that the devices can result in not only termination of their employment but also fines and jail terms for violating federal law. Ultimately, your drivers will find that the devices are simply not worth using.