Answer common questions about mobile phone signal jammers

1. Is there radiation?
If high-power equipment, such as 5W (37dBm) above the host computer may also have greater radiation. Generally, the output power of mobile phone signal booster is within 200mW (23dBm). After reaching the antenna, it is generally within 5mW (7dBm). After other losses, the indoor signal after installing a cell phone jammer is generally around -50dBm to -75dBm. Good outdoor signals are generally around -40dBm to -75dBm.

handheld blocker

When the mobile phone is talking, the GSM mobile phone is talking in a weak signal environment, and the worst radiation power can reach 1W (30dBm). After installing the amplifier, the radiated power of the mobile phone call is about 10mW (10dBm). It can also be said that after installing a small power amplifier in a poor signal environment, the mobile phone reduces radiation when talking.

2. How to distinguish the quality of signal amplifier?

1. Look at the workmanship and choose the brand. If you use more, you can take it apart and compare it internally.

2. There are many inferior signal amplifiers on the Internet, mainly because some circuits for optimizing signals, such as automatic gain control, are omitted. Generally, there are less than 80 devices, and the host with complete circuits generally has more than 200 devices.

3. Inferior cell phone signal amplifiers will cause serious interference to the base station after a large number of installations, making it impossible to make calls when the signal is full. Of course, there are interferences of good quality, but the interference of the same power is several times and dozens of times smaller.

3. Why can’t I make a call when the installation signal is full?

The signal amplifier is a simple device developed at the intermediate frequency of China Mobile and China Unicom. If there is no signal or very weak indoor China Unicom and China Mobile, it should be no problem to use this device. If one party has a full signal and the other has no signal, interference will occur in this case, so it is not recommended.

5G mobile phone signal jammer parameters

5G signaling is the hottest topic of the year, and the construction of 5G base stations across China has begun to implement 5G signal coverage. How convenient is it to use 5G signals? On the morning of May 10th, Hunan 5g Digital Industry Association and 5g + started the ceremony at Changsha Meishif International Cultural Arts Center, started the ceremony, Hunan Mobile and Xiang River, Hunan University, Xiang River Hospital, Banda Environment, Cool Wow Banda Partners have signed strategic agreements such as the establishment of a general 5g digital industry alliance to speed up the development of 5g application innovation. On the experience site, Revo, general manager of Hunan Mobile Changsha Branch, also passed the first 5G video call with Changsha City’s Tianxin District Committee standing member and Changsha City’s deputy director, State Shijun. .. We can think of how convenient 5G will bring to people.

As a new information technology infrastructure capable of providing at least 10 times the peak rate of 4g, transmission delays of millisecond, and billions of levels of connectivity, 5G is an automated driving, big health medicine, industrial internet, city of wisdom, Internet infrastructure for building things, high-definition video application scenarios to drive the Internet, big data fusion, artificial intelligence, and the depth of the real economy are critical to supporting high-quality development. is. It also brings about the rapid development of science and technology.

“3G, 4G, probably low and long wavelengths, at which high frequencies can resonate with some of the vibrational frequencies of water molecules and oxygen.” After the advent of 5G, future technological advances in 5G Not only do we need to enjoy the convenience and convenience, but we also need to pay attention to the effects of electromagnetic waves on the human body.

desktop cell signal blocker

China Mobile and China Unicom have issued a license to use mid-low frequency test frequencies in 5G systems. Among them, China Telecom and China Unicom have obtained licenses for test frequencies in the 3500MHz band, and China Mobile has obtained licenses for test frequencies in the 2600MHz and 4900MHz bands. Therefore, it is safe to use 5g jammer within the range. China Unicom and China Tele have secured a more international mainstream spectrum, but the story of China Mobile is much more complicated. In terms of subdivision, China Mobile has acquired 5G test frequency resources in the bands 2515mhz-2675mhz and 4800mhz-4900mhz. Of these, 2515-2575mhz, 2635-2675mhz, and 48800-4900mhz bands have been newly added, and 2575 bands have been added. -2635mhz prioritized China Mobile’s existing td-lte (4G) frequency.

Overview of wireless signal shielding principle of signal jammer

Let’s take a look at the overview of the principle of wireless signal shielding of signal jammers.

The working principle of mobile communication is that within a certain frequency range, wireless devices (mobile phones, etc.) communicate with the base station through radio waves, and complete data and sound transmission with a certain baud rate and modulation method. When the mobile phone communicates, it communicates with the base station through the uplink frequency, and then transfers the signal to the mobile service switching center to realize the call. In the standby state, the mobile phone communicates with the base station through the broadcast control channel. Once there is a call demand, it will be allocated to the mobile phone service channel according to the specific conditions of the channel near the terminal through the request, so that the mobile phone can jump to the service channel to realize the call and data transmission . At the same time, wireless communication must ensure a sufficient signal-to-noise ratio to effectively receive and complete communication.

desktop signal blocker

According to the above working principle, the cell phone signal jammer is generally composed of power supply, electronic scanning control unit, segmented radio frequency module unit, amplifier unit, transmitting antenna unit and other parts. The scanning signal generated by the signal generator passes the inverter, enters the oscillator and modulates it to the mobile communication working frequency band, and then is amplified by the power amplifier and the voltage regulator tube controls the power. The amplified frequency sweep signal is transmitted into the air in the form of radio waves. Because the frequency sweep signal forms garbled interference in the message signal received by the mobile phone (increasing the proportion of noise and noise signals to the device threshold), the mobile phone cannot receive the normal data sent by the base station, so that the mobile phone cannot establish a normal connection with the base station, thereby causing the mobile phone to disconnect Base station communication network. The mobile phone exhibits the phenomenon of no signal and no service system in the search network, which achieves the blocking effect. The mobile phone signal jammers produced by our company can achieve super high shielding effect, safe and simple.

The interference power of the jammer is fixed, and the shielding radius of the unblocked space is determined by the path attenuation and the signal level of the receiving base station. To realize interference from mobile phone signal jammers to mobile networks, it is necessary to ensure that the signal field emitted by the jammer is stronger than that of the mobile signal in the interference area. The closer the interference location is to the base station, the stronger the field strength and the smaller the effective interference area. , The farther the interference location is from the base station, the weaker the field strength and the larger the effective interference area.

It can be seen that within a certain transmit power, the interference range depends on the field strength in the interference area. No matter how powerful the jammer is, as long as the transmit power is a fixed value, as the distance increases, the interference signal strength will gradually attenuate and lose Interference ability. The following table shows the comparison table of distance and path attenuation. Then the output channel power of the jammer, the base station signal level, and the coverage line gain can determine the theoretical coverage radius with reference value.

Principle of signal isolator

In the industrial production process, a variety of instruments and meters are used in the monitoring and control of the generation process, which will generate a variety of signals: both faint small signals of millivolt level and tens of volts Large signals, even strong signals up to thousands of volts and hundreds of amperes; there are DC low-frequency signals, high-frequency or pulse spike signals; and these signals have to go through the process of mutual transmission and transmission, so how to ensure these signals In particular, the non-distortion of analog signals during transmission will become a problem that must be solved in system debugging.

Specifically, only when the analog signal transmission between the control device and the sensors and actuators distributed in the field is fault-free and undistorted, can the process control be safe and reliable. Especially low-power analog signals are affected by various external interference signals when they are transmitted in an industrial environment with high interference, and they need a reliable transmission channel. Daily work experience shows that due to equipment requirements, analog signals must be handled and transmitted carefully. However, the measurement and control parameters transmitted in the form of analog signals between the field and the control layer are often in a harsh industrial environment in the transmission project, which is likely to cause distortion of these signals.

smartphone signal blocker

Second, the principle of signal jammer

At present, the signal isolator (converter) is mainly divided into several kinds of isolation methods: transformer isolation method, photoelectric isolation method and transformer and photoelectric joint isolation method.

Signal isolators have a history of more than 40 years. Early signal isolators used transformer isolation. Its characteristics are: stable performance, long life, strong load capacity, high isolation strength, but the circuit is complex, and the manufacturing process requires higher.

With the development of electronic technology, in recent years, optoelectronic isolators produced by optical couplers have gradually appeared. Its characteristics are: stable performance, strong anti-interference ability, simple wiring and low cost, but compared to The transformer isolation method has a slightly shorter life.

In some occasions where the interference is large and the process requirements are high, the signal isolator of the combination of transformer and photoelectricity appears, and its isolation ability, resistance to unlimited radio frequency and electromagnetic interference is stronger.

How to make a signal blocking cellphone pocket?

For some at the National Republican Congress in Cleveland, the choice of protective accessory is an AR-15 rifle that is casually slung over the shoulder. For the Los Angeles-based artist and activist Tim Schwartz, it is a discreet pouch made of matt silver ripstop fabric that houses his cell phone.

This cell phone signal jammer blocks the signal that cell phones keep sending – a feature that Schwartz says is essential during an unpredictable, politically charged event like the Republican National Convention.

4g cell phone jammer

“I think it’s sensible that everyone should protect themselves when they get into a situation where they don’t know what’s going to happen,” says Schwartz. In particular, he states, “You can be easily followed by turning your phone on and off.” And if there is a disruption, the information could even be used retrospectively: “The government could request records and show that you were in this area when something went wrong.”

The Electronic Frontier Foundation, a non-profit organization dedicated to protecting civil liberties in the digital world, advises protesters that while their phones are powerful tools for documenting photos and videos, they also contain a wealth of personal information, including contacts, location and message history, emails and private credentials. “Our whole life is on our devices,” says Schwartz.

These high frequency blocking pockets, known as Faraday cages, are readily available to the powerful population that Schwartz calls the “techno elite.” Quartz reported on a $ 720 value of a cash transport and RF blocking bag, and President Barack Obama is traveling with a tent that serves that purpose.

For RNC protesters looking for a cheaper DIY option, Schwartz is holding “office hours” for protesters at the Spaces gallery in Cleveland to sew their own signal-blocking cellphone cases according to instructions from Berlin-based artist Aram Bartholl. Its meetings will take place today (July 19) and tomorrow from 1 p.m. to 4 p.m.

This is a protection that non-protesters could also consider, Schwartz says. “It’s like having long passwords,” he says. “It’s one of those things we should do, but we never get to it.”

Schwartz provided protesters with a copper taffeta fabric, a sewing machine and advice. He says his eighth grade sewing home economics training is appropriate for the job, and notes that the most important step is to make sure all of the edges of the bag are folded and secure.

Here are the directions from Aram Bartholl’s “Kill Your Phone” website. Materials are available on lessemf.com:

Cut 12 cm strips from your roll barrier fleece.
Make pieces of 50 x 12 cm, each for a bag. (i.e. you get 2 pieces of a 1 m long strip of rolls.)
Fold your 50 x 12 cm piece to 25 x 12 cm
Fold the long sides again, 1 cm each, and pin them in place with needles.
Sew two straight seams on the left and right.
Fold the opening at least 2 times! Find a paper clip or clip to close the pouch.
Done!
Schwartz previously developed a tool for victims of the Haiti earthquake to find their missing family members in 2010. He then “fell into the rabbit hole of digital privacy” and worked with the Center for Legal and Information Policy (CLIP) at Fordham Law School to investigate online privacy and reconcile it with security .

In recent years, Schwartz has conducted workshops on digital data protection such as “How to be a whistleblower” at schools like Cal Arts and UCLA, partly in collaboration with the web-based data protection movement Cryptoparty. For the remainder of the month, he will continue his work as an artist-in-residence at Spaces, where he is hosting events like a “dark web treasure hunt” to help people learn more about digital privacy.

Why military jamming technology is needed?

Russia’s accumulated intelligence and electronic warfare tools also include the deployment of Krasukha-4, an advanced electronic warfare system used to destroy radars and aircraft. Sputnik News reported on its presence in Syria, and the country claimed to have discovered a unique GPS jammer system in a video report of a Russian jet at Latakia Syrian Airport. The system and its parabola are shown with a 6-second mark in the video below.

Since the invasion of Iraq in March 2003, a series of active, passive, weekly and powerful saboteurs have arrived in Mesopotamia: Warlock Green, Warlock Red, Warlock Blue, ICE, MICE, SSVJ, MMBJ, Card brand. Dunwood, Juke Box (Symphony) now collectively refer to them as CREW. This is a clumsy acronym for an acronym. The improvised explosive device conducts electronic warfare against the jammer.

As more and more military turmoil floods the theater, the turmoil becomes more and more chaotic. Over the past few months, the Army and Marine Corps have clearly realized the shortcomings of electronic warfare expertise. Major Arch Messi, the commander of the Naval Surface Warfare Center, said: “We put all these boxes here, but people don’t know how to use them.”

This is especially true in Baghdad, where the electromagnetic environment seems to change with the community, the season and the time of day. A Pentagon executive said: “No one knows how much interference will occur on the ground.” This is the interface between the earth and the air at the intersection of the earth and the sky. The Army logistics staff added: “I don’t know that taxi drivers usually make electronic noises, doorbells, garage door openers, and satellite communications because they have not scientifically identified the problem. This is a normal life plan.”

Camouflage portable cell phone jammer

Even for North Koreans, GPS jammer is nothing new, but the latest tests are certainly rare. If there is no ground interference, it may indicate that the device is in the air, but since the FAA only covers airspace, ground interference cannot be ruled out.

In fact, interference may just be a test bed for new anti-jamming technologies that are under development and costly. As the ability to jam GPS every day becomes easier and cheaper, the military is actively developing new systems to enable aircraft, drones, and missiles to withstand jamming signals.

Have you got the skills of smart phone signal jammer?

The function of each mobile phone signal jammer is different. Of course, the smart phone signal jammer also has its unique functions. Below, we will solve its mystery for everyone. This

The reason why the jammer is recognized by everyone is that its skills are very powerful: we understand that it uses a unique 4G algorithm to interfere, which greatly improves the efficiency of interference and blocks

Any possibility for the mobile phone to transmit signals outside. At the same time, since the technology it uses is a communication-specific die-cast aluminum + engineering plastic chassis, it can support AC220V adaptation to

DC12V power supply. Therefore, our cell phone signal jammer can be used in many large places. It also has a skill that is unmatched by other products. It has green and energy-saving features.

WIFI5G 433 315 MHz Cell Jammer

Function, it uses 2W power, low radiation, low power consumption. Its appearance design is also very reasonable, each button has a corresponding function, you can adjust it at any time according to your needs, easy to operate, and very usable. The unique thing about this shield is that it has very superior performance, its volume is very small and does not occupy a lot of space. Its weight

The volume is also very light, very easy to carry, and easy to install. These are the unique skills of our products, have you got them?

MDPB 50A mobile phone signal jammer has a strong shielding effect

MDPB 50A cell phone signal jammer is a high-power mobile phone signal jammer specially developed and produced by adopting international advanced shielding technology to meet market demand. Compared with general signal jammers, MDPB-50A adopts a single channel 5W full power design, which has stronger shielding effect, wider shielding range, and more stable performance. It is suitable for a variety of large-scale secret places, especially prisons, detention centers, and conference rooms. Wait. MDPB-50A can automatically form a shielding magnetic field within the specified range when entering the working state, forcibly disabling mobile phone signals, MDPB-50A can shield mobile phone 2G, 3G, 4G, 5G communication signals and WIFI signals, but It will not interfere with the work of other electronic equipment, thus ensuring the safety of the required place. The mobile phone can be used without any damage to the human body after leaving the partition area, which is convenient and safe.

22 Antennas all Signal Jammers

Based on the principle of mobile phone (radio communication), this product uses broadband scanning technology to cut off the 2G, 3G, 4G, 5G and 2.4G WIIF wireless signal connections of the mobile phone, which manifests itself as a search network, no signal, no service system, etc., making the phone unable to call And answer, and can not send or receive text messages, but will not interfere with the work of other electronic equipment, thereby ensuring the safety of the required place, the mobile phone can be restored to normal use without any damage to the human body.

Mobile phone signal jammer installed in Science and Technology Museum of Mianyang City, Sichuan Province

The Mianyang Science and Technology Museum is located on the banks of the picturesque Furong Creek, echoing the Fule Mountain Scenic Area, the Chinese Scientist Sculpture Park and the Mianyang Museum under construction. In recent years, as more and more people continue to understand technology, Mianyang Science and Technology Museum has also become a popular place for many citizens to bring their families to visit during holidays. In order to maintain the orderly management and quiet environment of the Science and Technology Museum, and create a comfortable and harmonious atmosphere for the visitors, Mianyang Science and Technology Museum recently signed a cell phone signal jammer installation agreement with Chengdu Saiyue Communication Technology Co., Ltd. The Chengdu Saiyue Company is entrusted to effectively shield the wireless signals in some areas of the Science and Technology Museum, so that visitors can understand the charm of technology in a quiet and harmonious atmosphere.

5G frequency jammer for sale

According to the requirements of the science and technology museum, the personnel surveyed and measured the areas that need to be shielded, and communicated with the person in charge of the science and technology museum in detail to confirm, and finally submitted a complete set of mobile phone signal jammer system installation solutions and was approved . After intensive and orderly construction, the signal shielding system of Chengdu Saiyue Company’s own brand “Saiyuetong” successfully realized the wireless signal shielding in the designated area of ​​the Science and Technology Museum, achieved the expected effect and passed the test and acceptance of the Mianyang Science and Technology Museum.

Delhi government to install cell phone jammers in exam centers

It is common for jammers to be installed at investigation sites.

The AAP government has decided to install signal jammer to prevent high tech electronic equipment from being cheated on exams that are held for government agencies in Delhi. Stop being cheated during exams. The increased use of electronic devices in written tests has made the city government concerned about the possibility of incompetent candidates joining the government. “After the Delhi Subordinate Services Selection Board (DSSSB) successfully used the jammers in an auditor test a few months ago, they decided to use the device in their critical tests,” a government official told IANS.

smartphone signal blocker

The DSSSB was founded in 1996 and conducts written tests and interviews for middle and lower positions in the state government and in city authorities. A cell phone jammer is an instrument that prevents cell phones from receiving signals from base stations. When used, the jammer effectively disables cell phones. It transmits on the same radio frequencies as the mobile phone and interrupts communication between the phone and the base station of the mobile phone in the tower. “Nowadays students are using technology to pass exams which is the other side of technology. They remember ‘Munna Bhai MBBS’, don’t they,” added the official, referring to the Bollywood film in which the protagonist is featured – a local crook – is shown undergoing a medical examination with the help of a small earphone. “Applications were invited by various phone jammers service providers,” said one official.

According to the tender, the agency must ensure that a sufficient number of jammers are deployed and installed to block cellphone and blue tooth services in the exam center. Another requirement is that jammers, with or without a power supply, work without technical interference for the entire duration of the tests. There are various gadgets available in the market that can be customized for salwar kameez sets, sports bras, jackets, shirts, and regular buttons. In May, the Supreme Court ordered the center to install telephone jammers in exam centers to prevent paper leaks and other abuses. The guideline was created after an alleged fraud in the All India Pre-Medical Test (AIPMT). Many aspirants had SIM cards sewn to their shirts and had bluetooth devices. Over 350 calls were made to the various exam centers.