2020 July

Common questions and answers about signal interference

Can someone send me a text message when the phone is blocked?

After the mobile phone is blocked, the text messages sent by others will not be received, nor will it be possible to make and receive calls. After unblocking, that is, the cell phone jammer is turned off or you leave the area where the phone signal jammer works. If it is a text message sent to you by someone else on the same day, you will receive it. If it is earlier, such as yesterday or earlier, this It depends on whether the SMS service of your mobile communication service provider has this function.

gold portable cell phone jammer

Similarly, if you are blocked by your mobile phone, after someone dials your call, if your mobile phone is activated with Caller or similar services, after the signal is restored, you will receive a short message reminder of missed calls.

Can smartphones be immune to the influence of mobile phone jammers?

There is no way. The unshielded cell phone has nothing to do with whether the cell phone is smart or not.
The frequency of GSM mobile phone is 900MHz/1800MHz, CDMA is 800MHz, PHS is 1900MHz, mobile phone signal jammer usually shields the frequency interference of these four frequency bands, if you have a way to keep the phone out of this frequency, you can I don’t like jammer interference, so there is no way, because if the mobile phone is not within this frequency range, it is not a mobile phone (including PHS).

Does the jammer consume a lot of mobile phone batteries?

Mobile phone jammers consume a lot of battery for most mobile phones. Since the mobile phone jammer is turned on, the signal between the mobile phone and the base station will be shielded. Actually, it is interfered and cannot form normal communication with the base station. Then, many mobile phones have this function: when there is no signal, the mobile phone must be very Efforts to search for the signal, which leads to a lot more power consumption than the normal standby state!

Mobile phones bring safety hazards to gas stations

The number of small cars in Shenzhen is growing rapidly at a rate of 200 vehicles per day. How much do new drivers know about the safety regulations of gas stations? Yesterday, the reporter randomly interviewed several gas stations in the city and found that although the safety warning signs in the gas stations were very eye-catching, many drivers turned a deaf ear to the safety regulations such as banning mobile phones and turning off vehicles when refueling.

Most drivers have used their mobile phones at gas stations. How many people have complied with the safety rule of “turn off the vehicle when refueling”? The reporter interviewed several gas stations in the city and learned that 80% of novices often need to remind the fueler to stop the fuel when refueling. Old drivers generally do not need to remind the fuel to stop, but some old drivers do not want to stop the fuel because of trouble.

At the Sinopec gas station on Hongli Road, Ms. Huang from Meilin Village told reporters about her dangerous experience. Once when she refueled, she got out of the car without stalling, and the fueler reminded her to refuel after stalling the car. When she was refueling, her cell phone rang, and the fueler asked her to stand farther away to answer the phone. At that time, she felt a little unhappy in her heart, thinking that the fueler was very unkind. When she was standing far away on the phone, she suddenly heard a strange noise from the spray gun being refueling, and saw a sudden electric spark flashing from the front of the car. Although the spray gun automatically stopped refueling later, Ms. Huang was shocked. She told reporters that if it weren’t for the reminder of the fueler, it might have caused a catastrophe.

At a gas station near Liantang in Luohu District, 15 vehicles came to refuel within 20 minutes. Among them, 9 drivers were talking and laughing on their mobile phones while refueling. When the fueler was refueling a car, the driver’s mobile phone rang, and the driver picked up to answer the call. Although the fueler saw this scene, he did not remind the driver. On a pillar next to him, there was a post “No mobile phone use”. The striking goal.

During the reporter’s interview, two-thirds of drivers said they had used their mobile phones at gas stations, and many drivers even said they didn’t know this rule at all. A Mr. Zhu said: “I have never heard that calling on a mobile phone in a gas station will cause an explosion.” Many drivers think this is a big or small matter, and there is no need to make a fuss. Illegal operations can easily lead to accidents. It is common knowledge that fireworks are strictly prohibited at gas stations, but it is not clear to so many people that dialing or receiving mobile phones at oil depots or gas stations or refueling without turning off the flame may cause an oil and gas explosion. As more and more people use their mobile phones at gas stations and do not turn off the gas to refuel, relevant people warn that such illegal operations may become the fuse of an oil and gas explosion, and its danger is tantamount to playing with fire.

cell phone jammer

A person from the petrochemical company said that the density of oil and gas around the vehicle will increase sharply when refueling. At this time, the electronic friction generated by the mobile phone in the transmitting or receiving state may ignite the gasoline and cause an explosion. In fact, the manual of general mobile phone products will indicate: Do not use the mobile phone at the gas station! At the same time, the reporter learned that only last year, gas stations in Yueyang, Zhengzhou, Changsha, Lanzhou and other places had exploded due to the use of mobile phones, causing serious incidents of casualties.

Where can I sell mobile phone signal jammers?

At present, there are more mobile phone signal jammers on the market. There is no difference between good and bad. Some time ago, I purchased one from Texin Electronics and placed it in the company’s conference room. The effect is very good.

Generally, one meeting room with more than 100 square meters on your side should be enough. If it is 600 square meters, it is better for you to find out.

Everyone knows that mobile phone signals will be shielded during the college entrance examination. So how much do you know about mobile phone signal jammers? Today, the editor of China Security Network will introduce to you the principles, characteristics, and appearance of mobile phone signal jammers. The problem.

indoor phone jammer

Introduction of mobile phone signal jammer

The cell phone jammer effectively shields all mobile phone signals of CDMA (China Telecom), GSM (China Mobile, China Unicom), SCDMA (Netcom Da Lingtong), DCS (1800MHz), PCS (1900MHz), PHS (Telecom PHS) and 3G Used in examination rooms, prisons, courts, conference venues, libraries, theaters, churches, gas stations, gas depots, gas stations, hospitals and other places that require confidentiality, quietness, riot prevention, and interference prevention.

Introduction to the principle of mobile phone signal jammer

The working principle of the mobile phone signal jammer is as follows: within a certain frequency range, the mobile phone and the base station are connected by radio waves, and the data and sound transmission is completed with a certain baud rate and modulation method.

In view of the above communication principle, the mobile phone signal jammer scans from the low end frequency of the forward channel to the high end at a certain speed during the working process. The scanning speed can cause garbled interference in the message signal received by the mobile phone, and the mobile phone cannot detect the normal data sent from the base station, so that the mobile phone cannot establish a connection with the base station. The mobile phone is manifested as a search network, no signal, no service system and other phenomena.

Features of mobile phone signal jammer

Only shield mobile phone signals, and does not affect the normal operation of other electronic devices
Only shield mobile phone signals in the examination room, no interference to mobile phones outside the examination room, let alone the base station
Only shield the downlink frequency of the transmitting base station without affecting the uplink frequency
Green and environmentally friendly, the electromagnetic field intensity is far lower than the national standard, without any impact on the human body
The operation is simple, the antenna is installed correctly, and it can run automatically after power on

Problems and solutions of mobile phone signal jammer

1. Why is the shielding range different from that described in the manual when the shielding device is working?

Answer: The shielding range of the jammer is related to the strong electromagnetic field at the shielding site and the distance from the communication station. Generally the best is 200 meters away. The manufacturer has tested it under normal conditions, so the shielding range will be slightly different.

2. Will there be radiation when the mobile phone signal is shielded? Is it harmful to the human body?

Answer: Regarding radiation, as long as electronic products are large and small, there will be radiation. Any piece of electrical equipment will have radiation. Just like the mobile phones we usually use, it is inevitable that there will be radiation when leaning against our ears every day. The country has also set a standard for mobile phone radiation, and the radiation generated by our mobile phone signal jammer is much lower than the national standard, and it is not every day. Lean against the ears, so there is almost no harm to the human body.

How far is the most suitable shielding range of a mobile phone signal jammer?

The shielding distance of the device has a great relationship with the power of the device and the use environment, and several aspects that are helpful to the shielding effect: one is the output power of the device, the other is the working method of the shield, and the third is the use environment (indoor or outdoor). The fourth is to shield the interference intensity of the surrounding environment.

Nowadays, mobile phones are all digital signals, and the anti-interference ability of digital signals is very strong. Generally, the effect of using analog signal technology to interfere with digital signals is poor. Therefore, digital signals must be used to interfere with digital signals. The interference effect is quite different. The signal jammer using digital jamming signal technology has lower power and higher efficiency than the jammer using analog signal jamming technology.

desktop mobile phone blocker

The synthesis, attenuation, and reflection analysis of indoor mobile phone signals and interference signals is very complicated. Before shielding, the strength and quality of local cell phone signals have a great impact on shielding. Different mobile phones have different effects. Generally, mobile phones with strong ability to receive weak signals may not have good anti-interference effects.

The direction of the base station and the direction of the shielded area of the mobile phone also affect the shielding effect. Generally, the spatial signal strength is about -60 to -70dbm, and the base station can reach about -40dbm within a few hundred meters, and the mobile phone reception strength range is generally between -35 to -95dbm. The higher the signal power of the space mobile phone, the shorter the shielding distance.

The above conclusions are based on the law of radio signal transmission in free space. In reality, there are many obstacles on the ground that affect the transmission of radio waves. The above can only be qualitatively used as a reference, especially indoors. The above law is very different from the actual situation. Therefore, this problem is difficult to calculate accurately at the time, and can only be determined based on the actual situation on site. Precise construction projects must carry out preliminary research and signal testing, and then design specific solutions. In the later period, timely follow-up tests are required, and certain corresponding supplements can be foolproof, that is, to achieve the effect of strict shielding.

Multifunctional signal jammer, suitable for different interference purposes

GPS jammer not only provide communication protection. These GPS jammers can point out small problems in the network signal. The GPS jammer keeps the frequency free from any interference. Entrepreneurs and employees are also protected by any intrusive measures used by database crooks. Multifunctional shields set the tone, making all forms of information indispensable, whether it’s personal or business information.

In addition to GPS jammers, there are several other types of jammers, among which the best jammers are very useful for individuals and organizations.

The mini jammer is an excellent mobile phone jammer that can effectively block the signal while on the move. This portable jammer is not expensive. The portable jammer is very important. The jammer will not affect the work of any other electrical or electronic products around it. This feature of the portable jammer makes it easy to use without any restrictions. In addition, the portable shield is easy to carry and easy to carry. Therefore, it is an ideal choice for individuals. Portable jammers are available in different models and sizes.

portable mobile phone jammer

In addition, there is a 4G jammer, which can block all mobile phone signals from anywhere in the world. The 4G jammer is a very efficient and complex device. It is a powerful device that can block signals up to 20 meters long. The 4G jammer can be operated with batteries and adapters. Therefore, 4G jammers can be used indoors and outdoors. In other words, the advantage of this shield is that the installation location can be selected. 4G jammer is a more convenient shielding device.

Mobile phone signal jammer

Nowadays, mobile phones are all digital signals, and the anti-interference ability of digital signals is very strong. Generally, the effect of using analog signal technology to interfere with digital signals is poor. Therefore, digital signals must be used to interfere with digital signals. The interference effect is quite different. The jammer using digital jamming signal technology has lower power and higher efficiency than the jammer using analog signal jamming technology.

What are the advantages of installing a mobile phone signal jammer in an auditorium?

The rapid development of mobile communication has brought great convenience to people’s work and life, but the side effects caused by mobile phones have become increasingly apparent. The unsafe factors of mobile phones are mainly reflected in the fact that in important secret-related places such as agencies, factories, enterprises and institutions, intentionally or unintentionally dialing a mobile phone or forgetting to turn it off may cause a leak at any time. In some important secret-related occasions or meetings, the use of mobile phones is prohibited. At this time, we will use the cell phone jammer, which is a green new information security product that is newly developed using modern high-tech. The principle is similar to that of the communication signal source. A fan-shaped shielded space is customized according to the power of the jammer, and the normal wireless connection between the signal source and the mobile phone is cut off, so that the mobile phone in this space cannot be received or called. To achieve the purpose of compulsory banning of mobile phones, so as to ensure the safety and confidentiality of the scene. The appearance of the equipment is simple and elegant, solemn and beautiful; efficient and intelligent cooling and heat dissipation system, stable performance, safe and reliable; built-in professional directional antenna, without external antenna, can be directly powered on by the mains; good electromagnetic compatibility, integrated design and installation of the whole machine Convenient and simple to use and manage.

arm gsm 3g gps phone jammer

Jammer-mart mobile phone signal jammer detailed parameters: simple and elegant appearance, solemn and beautiful. Frequency band: CDMA/GSM/DCS/PHS/3G/4G/2.4G (WLAN/WIFI/Bluetooth)
Antenna form: Ten independent systems with built-in professional directional antenna
Effective shielding range: 5-40 meters@-75dBm (directional)
Start mode: manual switch
Continuous working time: ≥24 hours, high stability
Applicable places: suitable for secret-related medium and large conference rooms, auditoriums, conference venues, hotels and other places
Product size: 315*275*135mm (length * width * height)
Weight: about 5Kg

How to use: 1. Open the package and check whether the parts are in good condition; 2. Connect the power adapter and power cord to the port on the right side of the fuselage; 3. Insert the plug into the 220V mains socket; 4. Place the shield on On a plane above the ground 180cm (or hanging on a vertical wall), make sure that the front panel is tilted forward 3~5 degrees; 5. Press the switch on the right side of the fuselage, and the jammer can start to work automatically.

Key technical solutions and implementation methods of important functions:

(1) Broadband and high power output: solve the problem of wideband power gain increase, and power stability control after gain increase, waveform in-band smoothness and out-of-band suppression, control of out-of-band spurious indicators, and broadband output standing wave ratio Indicators (some indicators are repeatedly adjusted before the R&D plan is finalized, and omitted during normal production and after product quality is stable).

(2) Shielding between multiple systems: In the small space of the shielding instrument machine, there are 6 systems of CDMA, GSM, DCS/PHS, 3G1.3G, and 4G1.4G to transmit high-power, wide-band signals at the same time , Solve the intermodulation index generated between these multiple signals (repeatedly adjusted during research and development, omitted during production). B. Slow start circuit technology: The use of slow start circuit can avoid the sparking phenomenon caused by mechanical switches, and the integration is high and stable. C. Long-term uninterrupted work: The equipment adopts high-quality components, metal casing, and good heat dissipation performance. It can work uninterrupted for 7×24 hours. Long-term work will not cause damage to the performance of the equipment.

How to use high-power test room signal jammer

The test room high power jammer has become an indispensable tool in the test room, escorting the information security of the test room. However, if we do not use the equipment correctly, there will be poor results, or even an exam room accident. The following Texin Electronics as a manufacturer will share the correct use of the test room signal jammer.

smartphone signal blocker

1. The effective shielding range of the test room signal jammer will be different in different use sites. This is closely related to the signal field strength on site. The shielding range of mobile phones of different standards may not be the same at the same site;

2. The factors that affect the shielding range include but are not limited to: distance from the base station, orientation, obstacles, the wall material of the site building, the installation height of the shield, the installation specifications, etc.;

3. Each antenna has a frequency band identification, which must correspond to the frequency band identification on the host one-to-one. Before turning on the jammer, ensure that each antenna is connected reliably. It is never allowed to turn on the device without connecting the antenna;

4. The surface temperature of the shield is about 40～50℃ after working for a long time, which is normal. If the surface temperature is too high, please turn off the power and try to contact your local dealer or agent;

5. The normal installation height is 1.8 meters ~ 2.5 meters, try to choose a place where there are no obstacles between the target shielding area. The wall-mounted installation requires the antenna to face up vertically. When placed on a desktop, the antenna can be folded 90 degrees and then up vertically. There should be no AC power lines or other audio and video lines within 0.2 meters of the antenna;

6. During use, in order to avoid possible interference with some electronic equipment, try to keep it at least 1 to 2 meters away from the following common equipment: audio, wireless microphone, radio, computer, TV, Wi-Fi router, etc.

The above are the precautions when using the test room signal jammer introduced by Jammer-mart. I hope it can help everyone.

What are the characteristics of a 3-antenna 5-band handheld GPS mobile phone jammer?

In such a modern society, the use of GPS and cell phone signal tracking devices has become a common phenomenon in our daily lives. In order to prevent your life and privacy, and avoid being tracked by GPS and cell phone signal tracking systems, the ideal way to solve this problem is to have this kind of equipment to lock its working ability. This 3-antenna 5-band handheld GPS cell phone jammer is the good product you are looking for.

portable wireless signal jammers

As people’s living standards improve, most people pay more and more attention to their lives and privacy. As more and more signal tracking devices enter modern society, we must take action to compete with these tracking devices. This GPS cell phone jammer can help you and can be a good assistant. In order to enjoy a high-quality life, all types of jammers are an indispensable part of life. We use jammers to protect our privacy and protect our lives from the interference of such a modern society.

First of all, this handheld GPS mobile phone signal jammer has strong interference capabilities. It has 3 antennas but can cut off 5 frequency bands. The purpose is to cut off GPS and CDMA GSM DCS PCS signals at the same time. The 10-meter interference radius depends on the signal strength in a given area. This mini handheld mobile and GPS jammer can not only block cell phone signals, but also GPS signals. Therefore, you can enjoy a quiet life, and at the same time, you can enjoy a high-quality life without being tracked by others. These jammers can also protect our family and friends. More importantly, the mini portable design, you can use the mini compact design as you want, this mobile phone and GPS signal jammer bring more convenience to our daily life. You can take it to any place you want. You can use it at any time. In addition, this 5-band handheld jammer can also create a peaceful environment for you at the same time, just use it, and the mobile phone will lose the function of sending messages and making calls in the distance.

Drones are causing trouble again

From 6 am to 6:30 am local time on May 14, Saudi Aramco’s pumping stations 8 and 9 were attacked by drones, and the company was forced to temporarily close the east-west pipelines. The Yanbu Port that was attacked this time was even more than 700 kilometers away from the Houthi armed forces’ control area, and the ASEF-1 small drones currently in the hands of the Houthi are simply not enough to support such a distance. Voyage. The only explanation is that the attack was caused by a Houthi-armed drone attack squad that penetrated the border between Yemen and Saudi Arabia and carried out a long-distance attack.

Affected by this incident, international oil prices rose sharply during the intraday session, and the intraday increase once exceeded 1.5%.

In March of this year, the Houthi UAV has publicly reached an important strategic goal in southern Saudi Arabia: Suqa Phase 2 of independent desalination and power plants. Compared with the last reconnaissance operation on Suqa Plant 2, the attack on Yanbu is even more shocking, which is too far away from Yemen. Yanbu is located in the central area of Saudi Arabia’s Red Sea coast. The closest distance to Yemen is more than 800 kilometers. The range of small drones in the hands of Husseis is not that far. For such a long-distance flight, at least a medium-sized drone of the level of Rainbow 3 is required. The flying distance has exceeded the direct communication distance between air and ground. Satellite relay communication equipment is required to ensure the communication between the drone and the ground station. Because of the Houthi armed forces’ equipment level and organizational capabilities, the take-off point for this attack cannot be in Yemen. Either take off from the sea, or secretly infiltrate and take off near Yanbu. Obviously the former is the least difficult to implement.

The seven UAVs used in the attack were QASEF-1 suicide UAVs in the hands of Hu Sai. The pictures and information of the aircraft that Hu Sai has shown to the outside world are based on Iran’s Ababil-2 UAV. The maximum flight distance can reach 150 kilometers, the length is 2.5 meters, and the wingspan is 3 meters. Small fishing boats can carry it. . It is very likely that the fishing boat controlled by Husai sailed concealedly to the sea off Yanbu Port. The 150-kilometer voyage can ensure that the ship is on the high seas. The total weight of the warhead carried by the 7 QASEF-1s is 210 kg, which is enough. Two carefully selected pumping stations caused serious damage.

This shows the touching degree of the combat power of the Saudi “Royal Army”. First of all, the borders of their homes were infiltrated by the armed men of the other side without even knowing it, and they were allowed to run hundreds of kilometers in their own territory. What’s more, Iran’s aid to the Houthi armed forces has been significantly reduced after the sanctions. This can be said to be a wave of high-profile UAV counterattacks by the Houthi armed forces against Saudi Arabia under desperate conditions. Saudi Arabia, whose annual military expenditure is as high as 67.6 billion U.S. dollars, has nothing to do with it!

It’s time to consider using drone jammer to counter drone.

What are the differences between ordinary mobile phone signal jammers and high-quality signal jammers?

Signal jammer, generally speaking, can be divided into ordinary shielding and high-quality shielding.

Ordinary shielding, its technical characteristics are mainly based on shielding principles, using a large number of low-power or high-power devices to fight against, staying on simple technical solutions.

gps wifi cell phone jammers

High-quality shielding, its technical characteristics adopt strong signal digital frequency hopping technology, which reduces radiation by 150 times compared with ordinary shielding technology; mainly outdoor shielding, reducing indoor radiated power by hundreds of times; multi-channel combined technology, full-frequency antenna replacement N frequency-dividing antennas are suitable for wireless remoteness, laying the foundation for distributed antennas; using distributed antenna technology, reasonable distribution of shielding power, dispersing the power signal, reducing antenna radiation, providing tens of times the efficiency, and eliminating dead spots and leaks ; Jike’s unique TD synchronization technology, for China Mobile’s 3G (TD-SCDMA) and 4G (TD-LTE) networks, only shields the downlink pilot time slot to prevent interference to the base station, obtained by the China Mobile and Radio Management Committee The recognition, while reducing radiation dozens of times.

Comparison item Normal shielding Quality shielding
Low price moderate price
Technology
Basic shielding principle
Run by quantity
1. Digital dot frequency/frequency hopping technology
2. Multiplexing technology
3. Distributed antenna technology
4. Jike TD synchronization technology
Installation location is uncertain Outdoor
Radiation big radiation small radiation
Effect
1. Cannot fully shield
2. Large interference:
To surrounding/base station
3. Unstable operation
it is good
Service life is shorter than three years