Cell phone jammer is usually the first choice of many customers

Power consumption: power consumption of about 216W mask area: ≥ directional antenna main lobe) shielded area ≥ 30m (-75dBm @ directional antenna main lobe) (directional antenna main lobe Weight: about 8.55Kg Dimensions Weight (350 * 272 * 150mm Dimensions (W × H × D): 350 * 272 * 150mm technology features ultra-high bandwidth interference technology, upgrades and support for remote alarm. ◎ ultra-high bandwidth interference technology to support 3G upgrades and support Remote alarm active power (channel power) interference radius. The company has rapidly become the well-known company effectively producing cell phone jammer.◎ effective power (channel power) high, interference radius. imported components. slow start circuit design to avoid the phenomenon of mechanical ignition switch produced stable and high integration. students ignition phenomena, ◎ imported components. soft-start circuit design to produce the ignition switch to prevent mechanical phenomenon, high integration is stable., started to open the box carefully to the component to open the box would open the box of the Retain, move or carriage for future use. Carefully open the box would open the box to retain the good for future move or carriage purposes. check the project is in good condition open and if found Any missing or damaged parts of existing, dashing check with your dealer to open the project is intact. If you find any missing pieces of existing or damaged, contact contact the shield on your device to connect all of your connections and antenna and antenna please open the host power supply. cell phone jammer is usually the first choice of many customers.◎ connect all of your connections and antennas, please open the console. 1.0 At this point, the host defaults to the maximum power output of work. At this point, the host defaults to the maximum power output of work. Close your mask is off your mask off the host device ◎ Please direct power over the screen to stop working. please power off the host, the jammers to stop working. interfere with performance of the theoretical basis necessary to ensure adequate wireless communications carrier to interference ratio (signal to noise ratio), in order to effectively receive, complete communication. mobile communication necessary to ensure adequate wireless communications carrier to interference ratio (SNR) in order to effectively receive, complete communication.The company has built a long-term cooperation partnership with the American market because of cell phone jammer and other products.  Jammer signal is generated with the mobile phone to receive the same frequency interference signals to destruction of mobile reception conditions, communication between the machine and the base station connection to the shielding effect of communication with the communication between the base station connection to the shielding effect of communication. jammer interference power is certain, no space shield blocking the path radius is attenuation and signal jammers receiving base station interference power is certain, number of co-decision level. a common decision signal levels. The following table shows the distance and path attenuation table. The company is developing cell phone jammer based on the advanced foreign technology.The following table shows the distance and path attenuation comparison table. then shielded output channel power, shielded by the channel power output, the base station signal level, coverage antenna gain coverage radius can be determined. The following formula: the base station signal level, covering the antenna gain coverage radius can be determined.
The following equation: Pch + Gat-L + FAF ≥ Prx ≥ equation: where Pch: mask channel power output of the antenna gain, the minimum path attenuation path loss value, the path loss value.

This kind of GPS cell phone jammerfits the large vehicle such as the truck

E-GOLD currency known as the Internet age, is completely Internet-based online payment platform, created in late 1995. Has completely anonymous, fast, easy and completely crushed the concept of the geographical features and advantages, in just six years time, it has been a rapid development, more and more international companies and online stores began to accept E-GOLD payment way. It has become a powerful tool for e-commerce, including as Yahoo, Amazon, including many Internet companies have launched E-GOLD based payment transactions, is it more valuable as gold equivalent basis, completely divorced from any country's internal finances. Sohu Internet to listen to today honor from the Beijing University of Posts and Professor Lv Tingjie official channel of Sohu 3G conference keynote speech, as if sobering. But perhaps Professor Lv speech is too short, and many of which are personal or feeling confused, he just would not understand, write down the desired doubts. When the used field area is larger than the effective shielding range, it is suggested that more cell phone jammer should be adopted.
First of all, Lu said Professor of Internet and mobile Internet there are significant differences. Lu Professor said, the world's Internet is open, it is difficult to control and management, mobile communication technology is a strong management, strong control of the network. Therefore, based on communications technology for mobile Internet to the Internet as "off the reins of the horse" as pulled back, and pinch in the operator's hands. Meaning is not to say, operators of mobile communication technology to the development of the original open, difficult to control and manage the Internet for strong management and strong control. That being the case, then what is the development of wireless city do? Spend card online using mobile communication technology, is it not? WIFI or other mobile communications technology is not technology? The performance of mobile communication technology only on the phone? It is the 60W military communication backpackcell phone jammer.Or mobile phone Internet itself is Internet? operator what kind of technology through the pinch in the hands of the Internet? (the mobile Internet is mobile Internet). Then Lu Professor added: mobile Internet era, operators through strong technical background, can learn what it has done for each user, which summarized the the user's habits, preferences, etc., and thus provide for the needs of the user's personal , personalized service, so as to achieve accurate, effective delivery of business and service objectives. Also said some profound words. Mobile Internet era, operators will suddenly have a strong technical background in it? Do operators to create a still stronger than the green bar stuff. Is that the user what to do, including habits and preferences are under the control operator? Or is that operators in the "mobile Internet" on a good plan, "circle", the user in order to "mobile Internet" is only on the operator the "mobile Internet"? The power of each band ofcell phone jammeris 10watt with the total power of 40 watt.
Lu Professor iphone there is a theoretical model is not successful, only a small carrier and Apple are willing to cooperate. Also like to say these words and reality and not with whether. Since the iphone model can not succeed, AT & T how to do a good job then? AT & T is very small it? Very weak? Another of the most powerful people of China Mobile and Apple to talk about why so long? Why get on China Mobile's exactly like the iphone ophone it? cooperation and iphone how many operators are now? Professor Lv another example that when the iPhone app store is too active, because the bandwidth is limited, and its operators can not control, not management, channel width had been set, all the cars can walk in, the final outcome is led everyone dead, poor user experience. Bandwidth is limited, everyone knows, wired broadband is limited. As experience is poor, this can not say there. Just as we call, often encounter each other busy. Or for example I am using 2M of China Telecom's ADSL, presumably not low speeds, and can sometimes be difficult to access the website. Furthermore, after all, that the application is to store the user to use, do the each user will use the application? But also as an appointment as the days go to the market with get together? The future they should use the mobile Internet? Finally, Lu professor or firm to say "iphone model doomed to failure", and three years ago, said the. Now Nokia Ye Hao, Ye Hao of China Mobile, etc., in the cottage "iphone", nature will eventually fail. The output of antenna ofcell phone jammercan be adjusted from 0 Watt to 3Watt for each antenna.
Lu Professor three years ago, said the iphone mode to failure, why are iphone model has more fire? And eat crab, but more and more it? Implying are fools? Mere copycat? Questions raised too much, estimated to be very difficult to eleven doubts. In short, for operators, whether black or white, as long as the mobile Internet (tentatively so to speak, just as the mobile Internet on a) the cat is to give operators the benefit of operators are most concerned about. Mode with the iphone really does not work, then try ophone standards all right, do not try, how to know? Ancient once said a celebrity not do: There is no road, more people walk, they will become Road. For operators in the mobile Internet has not exactly profitable mode case, this sentence may be appropriate. Finally would like to mention one, I heard that now mobile MM also grow bigger way, and China Mobile's TD-LTE can reach 170M a recent test, can not wait for long, people can be in such a wide super-highway to close MM about the movement of water Lingling has. In order to move more gorgeously dressed Chula MM, MM development must not be destroyed during the delicate flowers Oh. "Mobile Internet users will exceed PC Internet users" - the judge is now estimated to have no doubt, the only uncertainty is just time. From 1.18 to 277,000,000, mobile phone users across the scale of this step is only a year and a half. Used to describe the explosive growth of mobile Internet users nearly a year of development, that is no exaggeration. This kind of GPScell phone jammerfits the large vehicle such as the truck.
2008, the scale of the development of mobile Internet users to enter a fast track, as of June 2010, Chinese mobile phone users reached 277 million, the overall penetration rate of Internet users has reached 65.9%. From this figures, with the explosive growth of mobile Internet is not to describe too. The rapid development of mobile Internet, for many reasons: first, a large base of mobile phone users as of June 2010 the number of Chinese mobile phone users has reached 810 million (Ministry of Industry data), which is the popularity of mobile Internet has laid a solid basis; In 2009, the official commercial 3G services is the growth of mobile Internet is an important thrust of the outbreak, 3G mobile Internet business has greatly accelerated the popularity of the concept for the development of mobile Internet provides a strong driving force; In addition, the falling prices of mobile terminals and function-rich, mobile Internet tariff reduction, but also greatly reduces the threshold of mobile Internet. In this combined effect of various factors, the emergence of mobile Internet users in the explosive growth of the scale. First article inspection will be carried out to cell phone jammer soon.

The transmission power of cell phone jammer phone

Relatively speaking, the installation method for exterior than “click install method” increased the cost of directional antenna. But also because it is to choose the directional antenna, all shielding scope of the basic confined within the building and building within a decade or two meters around for building outside unnecessary influence is relatively rare.
This type of installation method in practical application, first should be based on projected points will blockers and directional antenna installation in place, for all cell phone jammer blockers after open, in the building of the blind without signal detection in blind, if there is, sall adjust each blockers spotting spacing between or increase or decrease blockers quantity. Individual cases, may also require that blind construction for built to appropriately increase the internal situation of internal blockers patch points.
The installation method of cell phone jammer phone signal blockers selection is relatively broad, general and commonly used little power machine can choose, such as SMa – 818B, SMa – 818HB, SMa – 818C, SMa – 818HC, SMa – 818YB, SMa – 818W models all can.

   Laws 2.2.2 high-power blockers (60W above) stationing method
2.2.2.1 high-power blockers + directional antenna
If the target building need comparatively accurate and shielding, and need to minimize the impact on the target building periphery, conditions permitting, can consider cell phone jammer to use less number of high-power screen is + directional antenna to shelter to target the building it signal shielding.

 Laws 2.2.2 high-power blockers (60W above) stationing method
2.2.2.1 high-power blockers + directional antenna
If the target building need comparatively accurate cell phone jammer and shielding, and need to minimize the impact on the target building periphery, conditions permitting, can consider to use less number of high-power screen is + directional antenna to shelter to target the building it signal shielding.

High-power blockers usually refers to the transmission power of cell phone jammer phone signal in 60W above blockers, its cell phone jammer phone signals for the shielding radius with average of 50 to 100 meters (depending on weeks edge), such as base station of distance 818K60, SMa SMa – 818K100, SMa – 818K200 – cell phone jammer phone signal blockers high-power etc.
Cell phone signal blockers shielding signal in a transmission process, for the buildings, especially because of the reinforced concrete wall penetration ability is limited (attenuation larger), one side of the building in target direction and general hard 1 powerful blockers completely cover the whole building, all is usually to recommend in the building’s position on both sides before and after each corresponding erection a powerful blockers, for the whole building to achieve complete shielding. The diagram below:

The proposal aimed at these blind cell phone jammer area

Such “high-power blockers + directional antenna” approach before generally applied in goal for building a set of directional antenna auxiliary construction, such as, floor from right away before the limits (it is 20 to 50 meters) all have other building the side walls or roof can borrow to construct directional antenna. If no such right aerial, it should be the other buildings in the corresponding place USES vertical stroke to stem the way (as in the flagpole to erect antenna.
Use “high-power blockers + directional antenna” method, close to meet cell phone jammer a peripheral base station or aerial distance is not very ideal circumstances, may cause the top location or target building on both sides of the building with a few blind alleys, the proposal aimed at these blind area using small power blockers for points, namely: through the large and small power blockers do method of combining. Usually large and small power blockers in estimated quantity, can according to 1:2 or 1:3 proportion to estimate (1 powerful machine estimated 2 or 3 sets to replenish the blind area small power machine).

    
2.2.2.2 high-power blockers + omnidirectional antenna
If need to target buildings do, and overall shielding surrounding relatively open goal building, may overlook to target building surrounding influence, permitting conditions, can take cell phone jammer an examination with less number of trust in the high-power blockers + omni-directional antenna with to target the building to do signal shielding. The diagram below:

Such “high-power blockers + omni-directional antenna with” installation method, the several floors in target building no more than three layers of circumstances, can directly to the antenna mounted on all sides between the pentagon in position, and if the building roof above three layer, layer number is recommended cell phone jammer to the antenna mounted on all sides wall outside of altitude generally take the whole building, central high above a little bit wide offsets.


Use “high-power blockers + directional antenna” method, close to meet a peripheral base station or aerial height (position) is not very ideal circumstances, it can cause a large target floor of high-level position on either side of the building or leave a few blind alleys, the proposal aimed at these blind cell phone jammer area using small power blockers for points, namely: through the large and small power the method of combining blockers. Usually large and small power blockers in estimated quantity, can according to 1:2 or 1:3 proportion to estimate (1 powerful machine estimated 2 or 3 sets to replenish the blind area small power machine).
“High-power blockers + directional antenna” installation method is suitable for both need to target building indoor whole shielding, and need for building a certain peripheral range of open field into line shielding occasion.


In the building of 2.3 overall shielding
Many building in front and back into a list of cases, and no more than 50 metres before and after the interval when (depending on the peripheral base station of distance), between building and building a “power through to the antenna blockers + all the methods to achieve” complementary screen effect cell phone jammer , so can make full use of various blockers effectively screen radius, also the best possible saving blockers spotting quantity, concrete shielding effect schematic diagram shown below:

The building into a column of high-power blockers quantity needed is generally N + 1 (N for building number) building. While still need to consider a number of small power machine for blind spots.

The most common way is in every workshop cell phone jammer on both sides of a distance

In the building of 2.3 overall shielding
Many building in front and back into a list of cases, and no more than 50 metres before and after the interval when (depending on the peripheral base station of distance), between building and building a “power through to the antenna blockers + all the methods to achieve” complementary screen effect cell phone jammer , so can make full use of various blockers effectively screen radius, also the best possible saving blockers spotting quantity, concrete shielding effect schematic diagram shown below:

The building into a column of high-power blockers quantity needed is generally N + 1 (N for building number) building. While still need to consider a number of small power machine for blind spots.



2.4 aimed at factories, workshop
Match all is against 2.4.1 blockers to antenna
Factories, the workshop environment most are fully environment, in its internal achieving all cell phone signal shielding is relatively easy, the most common way is in every workshop cell phone jammer on both sides of a distance, each point by wall hung installed distance interval between 20 to 50 meters is generally, depending on the actual in pollen blockers effectively screen distance.
If internal plant have warehouses or toilet of lesser space such as regional, according to the wall alone against these conditions may need a small region of estimate alone shielding point bits.



With directional antenna 2.4.2 blockers
If the screen is required only for workshop in indoor, in factory workshop peripheral close has need not be shielded place, then need to be will all the blockers to antenna outfit and also into directional antenna in blockers selection on the cell phone jammer phone blockers choice model transmission cell phone jammer power can be adjusted.
Omni-directional antenna with directional antenna, due to the outfit directional antenna coverage area is relatively concentrated and reduced, and may in overall blockers point number has increased.

A common cell phone signal jammers installed Notes

No damage to the mobile phone the cell phone jammer mobile phone into the mask only when the region makes it impossible to send or receive telecommunications signals, once they left the shield area can be restored to normal mobile phone use. Reliable operation, without someone to maintain SMa-818W-type remote control mobile phone jammer high reliability and long-term stability under all conditions of continuous work. Green environmental protection equipment, human, material type jammers harmless 818W power, and consume less power, and a variety of electronic equipment without any harm. Try to avoid cell phone jammer being sheltered from large obstruction.Fast SMa-818W-type strain shielding device according to the sensitivity of sections of the phone status, usually within a few seconds can make the boot screen of mobile phones within the scope of no signal, to send and receive various types of mobile phone signal shielding effect, shut down after a few seconds , but also make all kinds of mobile phone back to normal use. Choose from a variety of directional antenna SMa-818W-type shielding device according to customer needs can choose a different site directional antenna (factory-configured standard rod antenna to meet the needs of the general situation), can meet a variety of complex field environment, in order to achieve the best possible shielding effect. Keep the cell phone jammer away from strong heat resource.More than the product manufacturers with a single-site adaptability. Our strong R & D capability has its own R & D capabilities, can be customized according to customer needs in various frequency jammers, can also do OEM for our customers OEM products. SMaSMa-818W-type mobile phone signal jammers Use: all kinds of examination room, church, court, library, conference centers, theaters, hospitals, military areas and other use is prohibited place. Venue: to prevent and eliminate the use of modern communication tools cheating candidates. Library: You can maintain a quiet environment for reading and study. Theater: As high-end entertainment, noise can be removed to maintain audience interest in the program. Hospital: when using the phone to prevent the harm caused by the human body and medical equipment failure. Court: the court can maintain the solemn and sacred. Military areas; to prevent leakage of military secrets.Keep the cell phone jammer away from strong electromagnet resource. In short, the phone signal jammers for a wide range, performance, and affordable. A common cell phone signal jammers installed Notes 1.1 The basic shielding installation notes to install a high degree of shielding device preferably not less than 1.8 meters above the ground. From the nearest mobile phone base station is less than 200 meters, shielding effectiveness is inversely proportional with the distance from the base station. That is, the closer the base station away from the shielding radius is smaller. Plug before tightening the antenna, the antenna on the subject of the antenna on the number and host number should correspond to the hole of the subject, do not plug the wrong, but not directly on the antenna does not pick the host power supply. 1.2 jammers standard method for installing the various components of the shielding device components generally include: host, antenna, power adapter. When installing the jammers, as the host and the peripheral antenna within a certain distance (usually 20-30 cm) there is a strong signal to the magnetic field. So that you can guarantee the blocking effect of cell phone jammer. And 220V power cord (strong power) around (usually 5-10 cm) have magnetic interference, therefore, how the various parts of the installation location to be placed on the critical, not positioned correctly, is likely to result in the emission signal interference shielding, impact shielding effect.

The cell phone signal jammers can be formed in a specified position

Size: 270 * 120 * 34mm Weight: 1.6Kg shielding radius :20-50m (depending on base station distance) products include: host 1, a power adapter, omni-directional antenna Ruanbian five applications: five-channel signal transmission, Built-in cooling fan, can turn over many years continuous use, long life, for prisons, factories, take a long time in the workplace. Cell phone signal jammers Roundup: mobile phone signal jammers Summary: With the rapid development of mobile communications, mobile phones have become an essential communication tool, mobile phones to bring convenient, fast and it has also a very high frequency and RF radiation, which is we all know, and how much of this radiation hazards, and we may not all know. The effective shielding range of cell phone jammer is a circle area centers on it.This mutation of the radiation signal, the light interference of precision instruments and equipment around the work, such as in hospitals, will affect pacemakers, ECG recorders, and other similar sophisticated equipment, leading doctors to diagnose errors. In severe cases, cause a static spark, ignition of combustible gases, the gas station, filling stations, chemical storage, oil refineries, hazardous materials storage yards and other areas of significant security threat. The cell phone signal jammers can be formed in a specified position within the magnetic shield (ie the mobile phone can not receive this signal), the mobile phone (including China Telecom, China Unicom and various PHS) within the specified range can not be played and access, will not be able to form the radiation signal mutation, so as to achieve the purpose of mandatory disabled mobile phone, the security of the above sites offer great protection.When use the cell phone jammer, please place it in a right shielding position. SMa SMa-818W mobile phone jammer jammer Usage of this subsection by the company independent research and development, production, which can effectively shield between the transmitter and the mobile phone microwave signal. As the original jammers imported devices with a new, professional welding machine placement, assembly line mass production, strict and efficient management to ensure a first class product quality, performance, stability, and long-term durability. SMaSMa-818W-type mobile phone signal jammers Features SMa-818W mobile phone signal jammers, over a long period of testing and field testing of user feedback showed that the jammers have formed their own unique characteristics: small size, light weight, this paragraph jammers volume: 270 * 120 * 34mm, weight: 1.6 kg. Place the cell phone jammer in the right position to avoid generating the dead angle.Simple, easy to install jammers in this paragraph only the antenna is properly connected, power on, you can work. Dealers or customers to read our training materials to the installation method to master the on-site installation. Installation according to security standards required, placed in walls, ceilings and other locations. . Band covering the whole, the range can choose a variety of shielding GSM, CDMA mobile phones, including PHS, 3G can be shielded, and only mask the base station downlink signal frequency does not interfere with the uplink frequency, does not affect the normal operation of the surrounding base stations, which Other brands of jammers is not necessarily impossible. Better install cell phone jammer at the ventilated place.200 meters away from the base station, the coverage radius of 20-50 meters, plus more directional antennas the range can be expanded.

For the cell phone and cell phone jammerindustry

16 Notes on the waveguide end and design of step 1) must not make the conductor through the cut-off waveguide, otherwise it will cause severe electrical leakage, which is a common mistake. 2) make sure to shield the waveguide relative to the frequency is off, and far higher than the cutoff frequency (5 times) the frequency of required shielding.More and more manufacturers lay emphasis on the investment of the cell phone and cell phone jammer market.  Cut-off waveguide design steps are as follows: A) determine the maximum frequency Fmax shielding and shielding effectiveness SE B) to determine the cut-off waveguide cut-off frequency Fc, the fc ≥ 5Fmax C) according to Fc, Fc calculated using the equation waveguide pipe cross-section dimensions d D) according to d and SE, the use of waveguide absorption loss formula waveguide length t Description: In the shield, the different parts of the gap junction formation may lead to electromagnetic leakage. Therefore, in the structural design, you can increase the width of the different parts of the overlap to form a series of "cut-off waveguide", reducing the gap of the magnetic leakage. Cell phone and cell phone jammer market has the large potential, so it can bring large-scale profit. At this time, as the maximum size of the waveguide cross-section spacing between the screws can be used, as the length of the waveguide with the width of overlap, as the cut-off frequency of the waveguide by the calculations to determine the spacing between the screws. When the spacing is larger, the lower cutoff frequency of the waveguide, it may not achieve the majority of disturbance attenuation effect. Panel display device handle 17 on the front panel display device, for 1) small display devices: If the size of a small display devices, can be taken directly to open holes in the panel method, the display device installed in the chassis , the hole bottom. As long as the holes in the panel to open a small (less than 3mm), usually does not cause serious electromagnetic leakage.For the cell phone and cell phone jammerindustry, besides manufacturers, there are lots of agents, retailers and operators.  However, the principle can know the leakage holes, holes from very close sources, the leakage of holes is very serious. Therefore, because the display pieces from the holes close, there may be leakage. At this time, can be planted in a hole on the cut-off waveguide, with a guided light beam. If, for aesthetic or other factors, can not use this method, can be used to isolate the display device and circuit, the circuit to improve the shielding, while the display device exposed. Many chassis to take this approach, the display device installed in a decorative plastic panel. 2) the larger display devices: the need for a larger window to display, then there are two methods. One approach is to use a transparent display window at the shielding material, an alternative method is similar to the above icon, the display device using isolated storage isolated from other circuits, the energy of the internal circuit will not spread radiation chassis, external interference will not invade the internal circuitry. The manufacturers and the agents will have a close and good cooperation relationship for the cell phone and cell phone jammer products. Transparent shielding materials: transparent shielding materials: There are two types of metal mesh sandwiched between two layers of glass composition, the other is on the glass or transparent plastic film coated with a thin conductive layer consisting of . The former material has the advantage of shielding effectiveness of high disadvantage is that because the visual discomfort caused by Moire fringes.

The cell phone will be shielded completely after covering a certain distance in the shielding area

How to Test Valid Shielding Distance of Cell Phone Jammer

1.3.1 The most effective and feasible method: multiple cell phone site testing

Use many cell phones of various frequency channels to test shielding effect of the cell phone jammer at site, which is the most rapid, convenient and feasible testing method. Compared with limitation of testing software by the cell phone and conversion after being tested by professional instruments, it is the easiest way to master. It is as follows:

Prepare lots of cell phones with various frequencies, including China Mobile, China Unicom, PAS, 3G (it is better that there is 3G of three different systems: China Mobile TD-SCDMA, China Unicom CDMA 2000, China Telecom WCDMA), turn on the cell phone jammer, hand hold every cell phone and test the effective shielding radius from the near to the distant starting from the jammer installation position. It is recommended that customer should test the shielding distance in multiple directions away from the cell phone jammer at the same time.

When checking whether the cell phone has been shielded, pay attention: checking signal strength of the cell phone is not enough for signal strength of the cell phone is fake sometimes. Use the cell phone at times and try to call the local free phone or fixed-line telephone. If not connected, it can be seen in the shielding range; otherwise, it is out of the shielding range.

When testing whether a point is in the shielding range, hand-hold the cell phone and keep it in the position for more than half a minute to make sure the cell phone is shielded.

If getting through a call in the non-shielding area and walking into the shielding area, normally the cell phone will be shielded completely after covering a certain distance in the shielding area, for the cell phone itself has the anti-interference ability once it gets through a call. The anti-interference will make cell phone automatically adjust emission power to make sure the normal call of this time. Therefore, it is not suggested normally doing the dynamic testing and completing the static testing in every point in the calling status.

After finishing testing at every frequency channel, select the shortest radius at a certain frequency channel as the valid shielding radius of the jammer in the area. According to this, the position can be predicted when doing the honeycomb position arranging in the large area.

The installation height of the cell phone jammer

1.1 Basic Notice of Installing Cell Phone Jammer

The installation height of the cell phone jammer above the floor is better to be no less than 18m.

If the installation place is less than 200m away from the cell phone base station, shielding effect is in inverse proportion to the distance away from the base station. It means that the closer the base station locates, the smaller the shielding radius is.

Fasten the antenna before switching on the power supply. The number marked on the antenna should be in the one-to-one correspondence with the number on the antenna hole in the main machinery. No wrong inserting and no direct switching on the power supply of the main machinery without connecting the antenna.

1.2 Standard Method of Installing Cell Phone Jammer Components

Power supply adapter should be more than 20cm away from the main machinery;

No heavy current line within 20cm around the antenna (AC220V)

Cell phone jammer components mainly include: main machinery, antenna, power supply adapter. When installing the jammer, for there exists a strong signal magnetic field in a certain distance ( normally 20-30cm) around the main machinery and antenna and magnetic field interference around (normally 5-10cm) 220V power supply wire (heavy current), it is very important how to arrange the installation places of components. If the installation place is wrong, interfering with the emission of shielding signal and influencing shielding effect will be caused. The standard installation distance between components of the jammer should be:

1.2.1 Compromised Installation Method of cell phone jammer

If power supply adapter cannot horizontally travel more than 20cm because of the limited field installation environment when installing the jammer, the compromised method is placing power supply adapter under the jammer main machinery. If taking this method, power supply adapter will be interfered by the strong magnetic field of main machinery. But, the interference will be less than that when power supply adapter is close to two sides of main machinery. It is as follows:

1.2.2 No Heavy Current around Antenna (220V/380V)

If the jammer adopts the wall hanging installation, ensure that there shouldn’t be heavy current wire around antenna of the jammer (including two sides of the antenna, above the antenna, heavy current hidden wire pre-buried in the wall where the antenna locates and so on). Hereby, the heavy current wire laid on the wall means the open wire and hidden wire which are the 220V or 380V AC circuit. The heavy current circuit also includes 220V power supply wire supplying power to the jammer itself. If installation place of the jammer has to pass the pre-laid heavy current line, please modify the wire to U type to avoid jammer main machinery and antenna. It is generally recommended the heavy current line should be laid a certain distance under the jammer main machinery.

1.2.3 Power Supply Adapter away from Main Machinery

Power supply adapter is 220V AC to 5V DC (as per mode number of the jammer, different machine type, and different output DC voltage) then supplies the power to the jammer main machinery. Power supply adapter has to be placed in the position more than 20cm away from the main machinery. Otherwise, the strong magnetic field from the main machinery and antenna will reduce the output voltage of adapter and influence the normal work of jammer main machinery so that bad shielding effect will be caused.

The cell phone jammer can use jammer’s omnidirectional antenna

Currently, the cell phone jammer is widely used in industries and locations, including the meeting room, examination room, prison, school, jail/work camp, theater, petrol station, oil depot, library, factory workshop and so on. Here introduces how to select installation positions of the cell phone jammer in the commonly applicable places.

Single Space (Minor and Mid-sized Meeting Room)

For the normal minor and mid-sized meeting room (the area is normally smaller than 300 square meters) whose inside is the transparent environment, it is easier to select the position of the cell phone jammer and the needed positions are less.

100-300 Square Meters

For the meeting room whose area is about 100-300 square meters, 1-2 small-power cell phone jammer installed inside are enough to shield the whole meeting room.

Installation place of the cell phone jammer depends on the site environment. If the top of meeting room is the ceiling floor or unfixed sprung roof, the jammer can be installed in ceiling or sprung roof or in the meeting table inside the meeting room, a certain corner or a wall.

The cell phone jammer can use jammer’s omnidirectional antenna which can changed into directional antenna if reducing interference with outside environment is needed.

The cell phone jammer types are various. SMa-818B、818HB、818W and so on are commonly used and SMa-818C、818HC、818YB whose power are adjustable can also be selected.

Over 300 Square Meters

For the single space whose area is more than 300 square meters, the installation position of the jammer can be selected as per the site size using equally spaced positions. The quantity is normally more than 3.

For the installation position of the cell phone jammer, if it can be installed on the ceiling floor in the middle, complete covering effect can be achieved with the least points, otherwise, installation method on the wall at two sides should be adopted.

The cell phone jammer can use jammer’s omnidirectional antenna which can changed into directional antenna if reducing interference with outside environment is needed.

The jammer type is various. SMa-818B、818HB、818W and so on are commonly used and SMa-818C、818HC、818YB whose power are adjustable can also be selected.

The cell phone can recover the normal use immediately after leaving the blocking range

2. Purpose and features of cell phone jammer

2.1 Purposes of cell phone jammer

The mobile phone jammer only acts on the mobile phone communication and doesn’t interfere with other electronic equipments or do harm to the human body. It can be widely used in such locations where using of the mobile phone is forbidden as the meeting room, auditorium ,court, interrogation room, jail, library, examination room, petrol station, oil depot, army and command center and so on.

2.2 Features of cell phone jammer

The series of BH-201 cell phone jammer consists of the latest surface mounted device and integrated circuit with good performance and convenient use and installation. It can be effectively divided into sections and only interferes with the down link. It will not interfere with the base station. The production process strictly conforms to ISO 9001 Quality System.  It can work stably and reliably. It is the ideal and reliable safety product to strengthen the information safety, ensure the safe production and protect the environment.

3. Main functions and technical indices of cell phone jammer

Product introduction of cell phone jammer
3.1 The series of BH-201 mobile phone jammer is the high-tech product elaborately researched, developed and manufactured by our company through adopting the foreign advanced technology and combining the actual situation of the domestic mobile communication. It can block the cell phone signal of GSM/CDMA/AMPS/DCS/PHS in the range of diameter of 25-100m so that the cell phone cannot call or be called but at the same time it will not interfere with other electronic equipments. The cell phone can recover the normal use immediately after leaving the blocking range. It will do no harm to the human body. Therefore, this kind of product can be installed in such flammable and explosive locations as the petrol station, oil depot, gas station and so on; such locations where using of the cell phone is forbidden as the army, public security system and so on; such locations where the cell phone interference should be prevented and which should be quiet as the hospital, meeting room, concert hall, cinema, school, library, examination room, church and so on.

3.2 Cell phone jammer advantages

3.2.1 Upmarket appearance: aluminum housing with the pattern color customized according to the customer’s taste.

3.2.2 Reliable performance: adopt foreign software technology and chip and template.

3.2.3 Cheapest unit price: the company adopts the advanced management mode to reduce the production cost and then reduce the using expense of the customer.

3.2.4 Convenient installation: nail it at 1.8-2.0m above the ground (the installation screw has been dispatched)

3.2.6 After service: three-month replacement, one-year repair and free maintenance for three years (the material cost will be handled ad per the actual situation).

3.2.5 Lowest power: For our company is the only research, development and manufacture factory specifically designated by State Copyright Bureau, the design of our company is mature. We have paid a lot of attention to the material to control the power under 1W (0.9W) specified by Information and Industry Ministry which is the lowest in South Asia in order that the normal wireless communication network will not be influenced.

Main purpose of cell phone jammer shielding system

3.5 Characteristics of cell phone jammer shielding system

Advancement, reliability, practicability, expansibility and convenience.

3.6 Key factors of influencing performance of cell phone jammer shielding system

3.6.1 Shielding effect

3.6.2 External interference

3.6.3 Electromagnetic radiation

3.7 Main purpose of cell phone jammer shielding system

3.7.1 Upmarket civil locations: large-scale concert hall, large-scale theater, large-scale auditorium and so on; mainly the quiet and confidential locations.

3.7.2 Party and government administration, military police and national safety department: prison, jail, national secrecy department and so on; mainly applicable to such special requirements as secrecy, anti-terrorism, antiriot, counter-scouting and so on.

3.8 Cell phone jammer shielding system project

The cell phone jammer shielding project is the reasonable and comprehensive project system, which utilizes various shielding equipments, attachments and technical application, i.e. it can perform the effective electronic countermeasure for public communication standard cell phone including CDMA, GSM, DCS, PHS, 3G (CDMA2000/TD-SCDMA/WCDMA) according to special requirements of customers so that function of shielding information can be achieved.

3.8.1 Large shielding project

Normally, the large project is the project with large investment scale. The so-called project means the project which is performed as per the design document, economically centrally accounted, centrally managed with the independent administrative organization and can independently realize function required by the document.

For many wrongful businesses put the ordinary civil cell phone jammer into use in such locations which has high requirements for shielding as the jail, prison and so on, the site shielding need can not be met so that effect of cell phone shielding system in many domestic prisons is not good. Although the cell phone shielding system finishes construction, it cannot work normally. Some wrongful businesses copy the managing concept of the professional manufacturer to step into the market of such locations which has high shielding requirements as the jail, prison and so on.

For the profession enterprise of researching, developing and manufacturing the cell phone shielding system, the requirements for the cell phone shielding are the same for any location where the cell phone shielding system is needed. The shielding rate of approximate 99.99% is required to be achieved. The cell phone shielding system may cost hundreds of thousands Yuan or even several million Yuan. Compared with the cell phone jammer worthy of hundreds of Yuan, the cell phone shielding system can be called the large-scale shielding project.

Currently, the cell phone jammer shielding system is mainly applicable to the jail, prison, large-scale concert hall, theater, movie center and so on.

Several cell phone jammers can be installed

5. Installation and notes of cell phone jammer

The cell phone jammer can be directly fixed on the wall or ceiling with the screw. The surface temperature of the product can reach 50℃; therefore keep it away from the object of the low heat-resistant performance. Installation height: the installation height of the series of BH-201 mobile phone jammer is 1.8-2m and at this time the biggest isolating range can be achieved. Installation direction: don’t point the antenna of the series of BH-201 cell phone jammer to the base station direction of the cell phone; otherwise the effect will be influenced.

5.1 Antenna connection of cell phone jammer

The antenna adopts the error-proofing design and it can be inserted and connected well only when correct.

If switching on the power supply when the antenna isn’t installed, the machine may be damaged.

5.2 Power supply connection of cell phone jammer

Check the power supply switch of the main machine and confirm the power supply switch is in the off position. Insert the output plug of the power supply transformer into the power supply socket in the middle at the left side of the main machine. The input plug of the power supply transformer connects with AC220V power supply.

6 Instructions of cell phone jammer

6.1 Isolating the cell phone signal: turn on the power supply switch of the main machine after confirming the antenna connects with the power supply; the power supply indication light is on; after 30s, the cell phone will display no signal or no network.

6.2 Cancel isolating the cell phone signal

If blocking of the cell phone signal is not needed, turn off the power supply switch.

6.3 Adjust isolating range

Normally, the emission power has been adjusted before delivery so there is no need for the user to adjust after purchasing.

The cell phone signal blocking range, installation position and height, antenna direction, distance from the base station, buildings around and so on can be selected through the test. The appropriate installation position and height and antenna direction can be determined to meet the needed isolating range. If the needed isolating range is large, several cell phone jammers can be installed; if the isolating range of the single cell phone jammer is larger than the needed isolating range, it can be realized by adjusting the emission power of the machine.

The shielding radius of 20 m radius of adjustable cell phone signal

In response to this communication principle, cell phone jammers in the course of their work to a certain speed past the lower end of the channel frequency to high-end scanning. The scanning speed can receive messages in the mobile phone signal interference in garbled form, the phone can not detect normal data sent from the base station, the phone can not establish connection with the base station. Performance of mobile search, no signal, no service system and so on.
   Common market, cell phone signal jammers, and its role frequency: 869 ~ 894MHz; 825 ~ 960MHz; 1805 ~ 1880MHz 1900 ~ 1990MHz and so on. It is convenient to install and use the BH-201 cell phone jammer.The role of band for the CDMA800, GSM900, DCS1800, PCS1900. Can control the range of 40 meters in diameter, using DC-DC converter input voltage, 5V output voltage.

Basic functions:
  A slow start function
Jammers in power, the working power in 4 seconds from zero to stabilize.
    2 shielding
Start after 35 seconds so that the phone is within the scope screen.

Another: Bluetooth work in the 2.4GHz frequency band, bandwidth of 1Mb / s. Will not affect Bluetooth.

First, the cell phone signal jammers Principle
The product is self-developed next-generation mobile phone signal jammers, in the course of their work to a certain speed past the lower end of the channel frequency to high-end scanning, the scanning speed can receive messages in the mobile phone signal interference in garbled form, phone can not detect the normal issued from the base station microwave signal data, within a certain range so that the phone can not establish connection with the base station, to disable the use of mobile phones purposes. cell phone jammer has been effectively divided so that it only interferes the down-link. Performance of mobile search, no signal, no service system and so on.
Second, product use:
Widely used: various types of examination room, conference rooms, gas stations, oil depots, churches, hospitals, courts, military areas, libraries, theaters and other places.
1 exam: Candidates can prevent and eliminate the use of modern communication tools to cheat.
2 meeting rooms: to ensure that the venue order, confidential meeting content, to prevent leakage of confidential meetings.
3 gas stations, oil depots: microwave signals to avoid interference caused by fire, explosion.
4 Church: mobile phone signal noise can be removed in order to maintain places of worship and majestic.cell phone jammer would not cause any interference to the base station.
5 hospitals: use the phone to prevent the harm caused by the human body for medical equipment and instruments work interference.
6 the court: the court can maintain the solemn and sacred.
7 military areas: to prevent the leakage of military secrets.
8 library: You can keep reading, learning a quiet environment.
9 theaters: as a place of entertainment, the noise can be removed to maintain audience interest in the program.

Third, the product features
The device is suitable for a wide range of performance, it can limit the transmitting station 200 meters away from any places, and the shielding radius of 20 m radius of adjustable cell phone signal. The course of cell phone jammer production strictly complied with the ISO9001 quality system. 4-channel models can be effectively shielded CDMA, GSM, DCS, PHS mobile signal, it only block mobile phone signals without an impact on other electronic equipment, is harmless.

Where are not allowed to use cell phones?

Because each has its own frequency band communications are, the filter will filter the signal in addition to their other bands, so the communication between devices generally disturbing each other.
Shielding device is different, shielded instrument will be used to send a large number of communication band interference signals, such as China Unicom and mobile phone frequency bands. These signals will cause the base station can not receive the normal range of terminals (mobile phones) sent coded signals.cell phone jammer could be widely used in meeting room, hall, courtroom, inquest room, jail, library, examination room, gas station, oil house, military and command center, etc. Reflected in the mobile phone is no signal, because the phone signal strength of the principle is that every so often to the base station sends a service request, said request for service, the base station sends a response that provide services, mobile response received and the proportion of missing out on the conversion shows the signal for your cell phone number. The so-called cell phone jamming device in the box under the signal shows 0 requests that you were all garbled signal interference, mobile phones and base stations communicate completely cut off.
Previously captured in the new cheating device is a report prepared by the Union without the band, the two terminal devices connected directly to the completion of microwave communication. cell phone jammer has been widely applying in occasions where are not allowed to use cell phones. Shielding device does not interfere with naturally to the band. In order to avoid even the new band was found and shielding, and to avoid using the same equipment as band interference (that is, string lines, all with the band receiving equipment have received all the information sending device), last year cracked the gang had discovered cheating of a band at 10 under communication equipment.
My current short-term projects for cheating recently seized equipment, a provincial education department for the development of this year's examination room shielding device, interference bands found cheating. Long-term project is to develop based on the three self-sniffing examination room shielded nuclear device, in theory, now the communications equipment to the then all-powerful shield and should be very easy to locate the suspect.BH-201 cell phone jammer are all formed by the latest patches and integrated circuits. From then to now developed the large-scale use should still have some time. If the just-released this year in the new frequency bands for communication equipment, then shielded instrument should still difficult to have their effect. If it is legitimate to in a shielded instrument where to get the signal, I suggest you can contact about related communications specialists, production in the shielding device can not interfere with the frequency band communications equipment, and the other under international law, and related documents, you need international the Union to apply to use of the band.
I learn from the spirit of the above information and communication purposes free of charge, shall not be used for commercial and illegal purposes. The resulting legal consequences to himself independent, hereby declare.
Now on the market can limit cell phone signal jammers 500M meters away from the launch pad, and a radius> 20 m cell phone signal. The BH-201 cell phone jammer has excellent performance. Shielding radius adjustable, it is only block mobile phone signals without an impact on other electronic devices. Save energy, power 20W - 480w.
    Phone work, in a certain frequency range, mobile phones and base stations via radio waves to link up to a certain baud rate and modulation for data and voice transmission.

The mobile cell phone jammer only has effect on communication of cell phones

Compared with similar products of six advantages:
1, the chip: the product of independent intellectual property rights of all chip-chip, to ensure product quality and stability.
2, power adjustable: shielding range from -30 m 2 m radius.
3, Power: product design using aluminum metal supply, heat supply significantly better than the plastic casing (plastic power dissipation is not good, very easy to burn), you can ensure long-term product stability.
4, the switch: the product and are equipped with the power switch on, the user operation is very convenient.
5, four channels: the product four channels (four antennas) cross-shielding, the shielding effect is better than two with built-in antenna and antenna products.
6, after-sales service: three months, shifting, one year warranty!cell phone jammer helps to resolve the problem that some criminals undertaking criminal activities.
Success Stories
Nanjing University of Science
Nanjing Jinling Petrochemical Corporation
Jiangsu Provincial Public Security
Institute of Electronics XIV
Taizhou People's Armed Police Corps
Sihong detention center in Jiangsu Province
1, shielding GSM/DCS/CDMA/PHS/3G Rd band 2, an aluminum alloy enclosure, panel or screen printing according to customer needs OEM logo (silk screen services provided free of charge) 3 , the transmission power 4W, each antenna of about 1W 4, effectively shielding adjustable from 1-20 meters (factory according to customer requirements debugging) 5, the human body without any damage to the main application apply all kinds of places the examination room, conference room or other place three months after service replacement, repair within one year performance.
cell phone jammer has restricted the use of cell phones in some certain ranges. Specifications No. 1 CDMA technology standard transmission frequency band 869-894MHz 2 PHS band transmission frequency band 1900-1990MHz 3 GSM frequencies 925-960MHz 4 launch DCS band transmission frequency band 1805-1880MHz 5 3G transmission frequency 2110-2170MHz 5 Power DC12V-36V Output DC 5V 6 Dimensions 210 (L) × 170 (W) × 45 (H) 7 Weight 800 g 8 isolated range 1-20 m (about 50-250 square meters) the role of mobile phones can type 139/138/137/136/135/133/131/130 9 / 10 use the PHS environmental conditions such as temperature of -10 to -55 ℃ relative humidity ≤ 90% (RH ) atmospheric pressure 86-106kPa. The mobile cell phone jammer only has effect on communication of cell phones. This product is available installation instructions direct screw fixed to the wall or ceiling, the product surface temperature can reach 50 ℃, so please stay away from low-heat objects. Installation height :1.0-2.0 m best installation directions: Do not phone signal jammers at the mobile phone base station antenna direction, otherwise it will affect the results. 1), the antenna design to connect the antenna to adopt anti-wrong, and only be inserted correctly installed. (Note: If you do not turn the power switch on the antenna may damage the machine) 2), power connector check the main power switch, make sure the power switch is off, the power plug with AC220V power supply connection.
The principle of microwave communications equipment used in the Union to apply its own dedicated communication band, and then use the band-pass filter to filter out other signals in addition to their band. The mobile cell phone jammer only has effect on cell phones but not other electronic equipments. Communication between mobile phones and base stations is such, mobile phones and base stations set up microwave network between the base station cellular network to achieve a cell phone communications.

It is suggested that more cell phone jammers should be added

5 Maintenance of cell phone jammer

5.1 The cell phone jammer is the maintenance-free equipment with no need for maintenance.

5.2 When wiping and cleaning the surface of cell phone jammer, the chemical solvent is forbidden and water should be avoided entering the machine.

5.3 The cell phone jammer should be kept in the dry and ventilated place when it is not used to avoid contacting the salt frog and harmful gas for a long time.

5.4 The warranty period of the cell phone jammer is one year with free repair in three years and forever maintenance.

6 Questions and answers

Q: Why do some cell phone signal indicators still show signal indication when the cell phone jammer works?

A: It is just a kind of false image. Actually, the cell phone can not communicate right now. When you press the dial button, you will find that there will be no signal indication on the signal indicator.

Q: Will the cell phone jammer interfere with the normal work of other electronic equipments?

A: No, it will not. Because the electromagnetic signal sent by the cell phone jammer is totally within the working frequency range of the cell phone specified by the nation. It will only block the mobile communication. And this kind of signal is always in the relatively static

Q: Is the cell phone jammer harmful to the human body and cell phone?

A: The electromagnetic signal strength sent by the cell phone jammer is very weak. The testing data shows that this kind of signal strength will not do harm to the human body at all. At the same time, the cell phone jammer only blocks the uplink signal so that the cell phone cannot connect with the base station. Therefore, it will do no harm to the cell phone itself.

Q: Is there any difference when using the cell phone jammer indoors or outdoors?

A: Yes, there is. The effective shielding distance (30-40m) of the cell phone jammer normally means the indoor distance. In the open place outdoors, the effective shielding distance can reach several meters. The effective shielding distance has something to do with the environmental conditions whether it is used indoors or outdoors, such as the distance from the base station, installation position and so on. Therefore, when using the cell phone jammer, this factor should be full considered to avoid forming the shielding dead zone and then influencing the shielding effect.

Q: Is the shielding effect the cell phone jammer generates for GSM cell phone and CDMA cell phone the same?

A: It is a good question. The anti-interference performance of the CDMA cell phone is much better than that of the GSM cell phone. Therefore, the effective shielding distance the cell phone jammer generates for the CDMA cell phone is smaller than that for the GSM cell phone with the small difference of 2-4m. However, it is suggested that more cell phone jammers should be added when necessary for some very important locations to ensure the shielding effect for the CDMA cell phone.

Q: The housing will burn after the cell phone jammer works for a while. Will the long-time working damage the machine?

A: It is the normal phenomenon. In the design, we use the heat conductivity of the aluminum-alloy heat conducting strip to assist with heat dissipation to ensure the long-time stable work. Therefore, burning of the housing will not damage the machine.

The cell phone within the electric fence cannot communicates with the outside

Prison Cell Phone Jammer System Solution

1 Prison cell phone jammer shielding need analysis and solution

The cell phone jammer system has passed the strict testing of Testing Center for Quality of Security & Police Electronic Product under the Ministry of Public Security of P.R. China and Safety product Testing Certification Center of PLA.

The indices and technologies of cell phone jammer system are of the world advanced level. The cell phone jammer runs stably in the practical use in central government agency secrecy units, state agency secrecy units, air force, navy, general staff, Nanjing war zone, Guangzhou war zone, People’s Liberation Army garrison in Hong Kong and Macao and so on.

The cell phone jammer has gain the support from the China Mobile, China Unicom and radio management committee and so on in Changchun, Shenyang, Jinzhou, Jinan and so on. According to actual requirement of the customer, the real signal field strength for the four prison areas have been measured through using the specific cell phone signal testing tool.

The solution is as follows taking into account that the prison area and cell phone signal base station are close and every prison area is the building floor structure.

1.1 Outdoor installation of cell phone jammer system

The overall architectural structure features are as follows: there are four areas with three cell phone signal base stations spaced from east to west and a road spaced from south to north; the environment is complicated and the area of every prison zone is big. Therefore, HTCX-100B (direction) cell phone jammer is recommended to be installed around every prison zone.

Note: HTCX-100 is middle-type omnidirectional cell phone jammer. HTCX-100A is the small-type directional cell phone jammer. HTCX-100B is large-type directional cell phone jammer. CONSDATA-1000A is warfield-type directional cell phone jammer.

For the site situation (such as the architectural layout and floor situation and so on) is not that clear, especially the signal strength is not measured, two kinds of allocation plans are recommended. Plan 1 (economic): 15 sets of large-type directional cell phone jammers are adopted. If the base station signal is too strong to be suppressed, 1 or 3 large-type directional cell phone jammer(s) should be added.

Plan 2: 5 large-type directional cell phone jammers and 2 outdoor warfield-type directional cell phone jammers should be adopted. The plan has no special requirements about the architectural layout, floor situation and base station signal strength.

1.2 Outdoor installation schematic diagram of cell phone jammer system

Plan 1: 15 large-type directional cell phone jammer allocation layout. Note: ★ means the specific installation position of cell phone jammer.

Plan 2: 5 large-type directional cell phone jammer and 2 outdoor warfield-type directional cell phone jammer.

2 Design principle of prison cell phone jammer system

The communication characteristic of mobile phone: the GSM or CDMA cell phone has a forward channel to send the message and a backward channel to receive the message. During communication, the cell phone turns the voice or data information into the data frames with the length of several milliseconds and continuously transmits the information in the form of data chain through the digital cellular net.

The cell phone jammer designs the shielding signal starting device controlled by the computer for these characteristics. The device can generate a spherical electric fence to act on various cell phone forward channels to completely shut off the cell phone data chain so that the cell phone within the electric fence cannot communicates with the outside with the specific behavior of searching net, no signal and no service and so on.

3. Beijing Consdata Company Introduction

Beijing Consdata Company, locating in Beijing High and New Technology Development Area, is a high-tech enterprise. The company has a group of high-tech talents and first-class research and development equipments with developing and manufacturing the safety cell phone jammer product as the main target of the company.

Our company finally finds a technical track to effectively prevent cell phone leaking and successfully manufactures the cell phone jammer of independent intellectual property through using the electromagnetic emission suppression technology after deeply analyzing the cell phone communication principle.

Three protection abilities of antenna of cell phone jammer

Other Technical Parameters of Antenna of Cell Phone Jammer

1. Passive intermodulation (PIM) of antenna of cell phone jammer The PIM characteristic means the intermodulation effect of such passive components as the joint, feeder line, antenna, filter and so on caused by their own nonlinearity when they work under the condition of high-power signal of many carrier frequencies.

Normally, the passive component is considered to be linear. But passive components have the certain nonlinearity to different extent under the high-power condition. This kind of nonlinearity can be caused by the following factors: metal contact o different materials; unsmooth contacting surface of the same material; the joint is not close; the magnetic material exists and so on.

The intermodulation product will interfere with the communication system especially the intermodulation product lying in the receiving band will seriously influence the receiving performance of the system. Therefore, there are the strict requirements for the intermodulation characteristic of such passive components as the joint, cable, antenna and so on in the GSM system. The passive intermodulation index of the joint we select can reach -150dBc; that of the cable can reach -170dBc; that of the antenna can reach -150dBc.

2. Size and weight of antenna of cell phone jammer The configuration should be as small as possible and the weight should be as light as possible under the condition that every electrical index is met for the convenience of storage, transportation, installation and safety of the antenna.

3. Wind load of antenna of cell phone jammer The base station antenna is normally installed in the high building and iron tower. Especially in the costal area, the perennial wind speed is big so it is required that the antenna can work normally at the speed of 36m/s and it will not be damaged at the speed of 55m/s.

4. Working temperature and humidity of antenna of cell phone jammer The base station antenna should work normally in the temperature range of -40℃-+65℃ and in the relative humidity range of 0-100%.

5. Lightening protection of antenna of cell phone jammer The input ports of all radio frequencies of the base station antenna are all required to be grounded directly.

6. Three protection abilities of antenna of cell phone jammer The base station antenna should have the three protection abilities, i.e. moisture protection, salt frog protection and fungus protection. For the omnidirectional antenna of the base station, the inverted installation should be allowed and at the same time, the three protection requirements should be met.

7. Types of antenna of cell phone jammer The antenna has directional antenna and omnidirectional antenna according to the direction; single polarization antenna and dual polarization antenna according to the polarization form. Different antenna forms should be adopted according to different locations, different landforms and different user distributions and other situations.

The antenna has many types (models). The main types of the current base station antennae are as follows: 1. Omnidirectional and middle-gain（8-9dBi）, high-gain（more than 9dBi）ordinary antenna (without zero padding and forming technology). 2. Omnidirectional and middle-gain（8-9dBi）, high-gain（more than 9dBi）formed antenna (zero padding). 3. Omnidirectional high-gain（more than 9dBi）ordinary wave beam downdip antenna (without zero padding, 2°-6°) 4. Directional middle-gain（12-15dBi）, high-gain（more than 15dBi）ordinary antenna-plane half-power wave beam width 90°. 5. Directional middle-gain（13-16dBi）, high-gain（more than 16dBi）ordinary antenna-plane half-power wave beam width 65°. 6. Omnidirectional high-gain（more than 9dBi）formed wave beam downdip antenna (zero padding 5%-25%, descending 1.25°-6°).