Tests of the robustness of commercial GNSS devices against threats show that different receivers behave differently in the presence of the same threat vectors. A risk-assessment framework for PNT systems can gauge real-world threat vectors, then the most appropriate and cost-effective mitigation can be selected. Vulnerabilities of GNSS positioning, navigation and timing are a consequence of the signals’ very low received power. These vulnerabilities include RF interference, atmospheric effects, jamming and spoofing. All cases should be tested for all GNSS equipment, not solely those whose applications or cargoes might draw criminal or terrorist attention, because jamming or spoofing directed at another target can still affect any receiver in the vicinity. GNSS Jamming. Potential severe disruptions can be encountered by critical infrastructure in many scenarios, highlighting the need to understand the behavior of multiple systems that rely on positioning, and/or timing aspects of GNSS systems, when subject to real-world GNSS threat vectors. GNSS Spoofing. This can no longer be regarded as difficult to conduct or requiring a high degree of expertise and GNSS knowledge. In 2015, two engineers with no expertise in GNSS found it easy to construct a low-cost signal emulator using commercial off-the-shelf software–defined radio and RF transmission equipment, successfully spoofing a car’s built-in GPS receiver, two well-known brands of smartphone and a drone so that it would fly in a restricted area. In December 2015 the Department of Homeland Security revealed that drug traffickers have been attempting to spoof (as well as jam) border drones. This demonstrates that GNSS spoofing is now accessible enough that it should begin to be considered seriously as a valid attack vector in any GNSS vulnerability risk assessment. More recently, the release of the Pokémon Go game triggered a rapid development of spoofing techniques. This has led to spoofing at the application layer: jailbreaking the smartphone and installing an application designed to feed faked location information to other applications. It has also led to the use of spoofers at the RF level (record and playback or “meaconing”) and even the use of a programmed SDR to generate replica GPS signals — and all of this was accomplished in a matter of weeks. GNSS Segment Errors. Whilst not common, GNSS segment errors can create severe problems for users. Events affecting GLONASS during April 2014 are well known: corrupted ephemeris information was uploaded to the satellite vehicles and caused problems to many worldwide GLONASS users for almost 12 hours. Recently GPS was affected. On January 26, 2016, a glitch in the GPS ground software led to the wrong UTC correction value being broadcast. This bug started to cause problems when satellite SVN23 was withdrawn from service. A number of GPS satellites, while declaring themselves “healthy,” broadcast a wrong UTC correction parameter. Atmospheric Effects. Single frequency PNT systems generally compensate for the normal behavior of the ionosphere through the implementation of a model such as the Klobuchar Ionospheric Model. Space weather disturbs the ionosphere to an extent where the model no longer works and large pseudorange errors, which can affect position and timing, are generated. This typically happens when a severe solar storm causes the Total Electron Count (TEC) to increase to significantly higher than normal levels. Dual-frequency GNSS receivers can provide much higher levels of mitigation against solar weather effects. However, this is not always the case; during scintillation events dual frequency diversity is more likely to only partially mitigate the effects of scintillation. Solar weather events occur on an 11-year cycle; the sun has just peaked at solar maximum, so we will find solar activity decreasing to a minimum during the next 5 years of the cycle. However that does not mean that the effects of solar weather on PNT systems should be ignored for the next few years where safety or critical infrastructure systems are involved. TEST FRAMEWORK Characterization of receiver performance, to specific segments within the real world, can save either development time and cost or prevent poor performance in real deployments. Figure 1 shows the concept of a robust PNT test framework that uses real-world threat vectors to test GNSS-dependent systems and devices. OPENING GRAPHIC FIGURE 1. Robust PNT test framework architecture. Figure 2. Detected interference waveforms at public event in Europe. Figure 3. Candidate Interference Resilience receiver accuracy evaluation. We have deployed detectors — some on a permanent basis, some temporary — and have collected extensive information on real-world RFI that affects GNSS receivers, systems and applications. For example, all of the detected interference waveforms in Figure 2 have potential to cause unexpected behavior of any receiver that was picking up the repeated signal. A spectrogram is included with the first detected waveform for reference as it is quite an unusual looking waveform, which is most likely to have originated from a badly tuned, cheap jammer. The events in the figure, captured at the same European sports event, are thought to have been caused by a GPS repeater or a deliberate jammer. A repeater could be being used to rebroadcast GPS signals inside an enclosure to allow testing of a GPS system located indoors where it does not have a view of the sky. The greatest problem with GPS repeaters is that the signal can “spill” outside of the test location and interfere with another receiver. This could cause the receiver to report the static position of the repeater, rather than its true position. The problem is how to reliably and repeatedly assess the resilience of GPS equipment to these kinds of interference waveforms. The key to this is the design of test cases, or scenarios, that are able to extract benchmark information from equipment. To complement the benchmarking test scenarios, it is also advisable to set up application specific scenarios to assess the likely impact of interference in specific environmental settings and use cases. TEST METHODOLOGY A benchmarking scenario was set up in the laboratory using a simulator to generate L1 GPS signals against some generic interference waveforms with the objective of developing a candidate benchmark scenario that could form part of a standard methodology for the assessment of receiver performance when subject to interference. Considering the requirements for a benchmark test, it was decided to implement a scenario where a GPS receiver tracking GPS L1 signals is moved slowly toward a fixed interference source as shown in Figure 3. The simulation is first run for 60 seconds with the “vehicle” static, and the receiver is cold started at the same time to let the receiver initialise properly. The static position is 1000m south of where the jammer will be. At t = 60s the “vehicle” starts driving due north at 5 m/s. At the same time a jamming source is turned on, located at 0.00 N 0.00 E. The “vehicle” drives straight through the jamming source, and then continues 1000m north of 0.00N 0.00E, for a total distance covered of 2000m. This method is used for all tests except the interference type comparison where there is no initialization period, the vehicle starts moving north as the receiver is turned on. The advantages of this simple and very repeatable scenario are that it shows how close a receiver could approach a fixed jammer without any ill effects, and measures the receiver’s recovery time after it has passed the interference source. We have anonymized the receivers used in the study, but they are representative user receivers that are in wide use today across a variety of applications. Isotropic antenna patterns were used for receivers and jammers in the test. The test system automatically models the power level changes as the vehicle moves relative to the jammer, based on a free-space path loss model. RESULTS Figure 4 shows a comparison of GPS receiver accuracy performance when subject to L1 CHIRP interference. This is representative of many PPD (personal protection device)-type jammers. Figure 5 shows the relative performance of Receiver A when subject to different jammer types — in this case AM, coherent CW and swept CW. Finally in Figure 6 the accuracy performance of Receiver A is tested to examine the change that a 10dB increase in signal power could make to the behavior of the receiver against jamming — a swept CW signal was used in this instance. Figure 3. Candidate Interference Resilience receiver accuracy evaluation. Figure 4. Comparison of receiver accuracy when subject to CHIRP interference. Figure 5. Receiver A accuracy performance against different interference types. Figure 6. Comparison of Receiver A accuracy performance with 10db change in jammer power level. Discussion. In the first set of results (the comparison of receivers against L1 CHIRP interference), it is interesting to note that all receivers tested lost lock at a very similar distance away from this particular interference source but all exhibited different recovery performance. The second test focused on the performance of Receiver A against various types of jammers — the aim of this experiment was to determine how much the receiver response against interference could be expected to vary with jammer type. It can be seen that for Receiver A there were marked differences in response to jammer type. Finally, the third test concentrated on determining how much a 10dB alteration in jammer power might change receiver responses. Receiver A was used again and a swept CW signal was used as the interferer. It can be seen that the increase of 10dB in the signal power does have the noticeable effect one would expect to see on the receiver response in this scenario with this receiver. Having developed a benchmark test bed for the evaluation of GNSS interference on receiver behavior, there is a great deal of opportunity to conduct further experimental work to assess the behavior of GNSS receivers subject to interference. Examples of areas for further work include: Evaluation of other performance metrics important for assessing resilience to interference Automation of test scenarios used for benchmarking Evaluation of the effectiveness of different mitigation approaches, including improved antenna performance, RAIM, multi-frequency, multi-constellation Performance of systems that include GNSS plus augmentation systems such as intertial, SBAS, GBAS CONCLUSIONS A simple candidate benchmark test for assessing receiver accuracy when subjected to RF interference has been presented by the authors. Different receivers perform quite differently when subjected to the same GNSS + RFI test conditions. Understanding how a receiver performs, and how this performance affects the PNT system or application performance, is an important element in system design and should be considered as part of a GNSS robustness risk assessment. Other GNSS threats are also important to consider: solar weather, scintillation, spoofing and segment errors. One of the biggest advantages of the automated test bench set-up used here is that it allows a system or device response to be tested against a wide range of of real world GNSS threats in a matter of hours, whereas previously it could have taken many weeks or months (or not even been possible) to test against such a wide range of threats. Whilst there is (rightly) a lot of material in which the potential impacts of GNSS threat vectors are debated, it should also be remembered that there are many mitigation actions that can be taken today which enable protection against current and some predictable future scenarios. Carrying out risk assessments including testing against the latest real-world threat baseline is the first vital step towards improving the security of GNSS dependent systems and devices. ACKNOWLEDGMENTS The authors would like to thank all of the staff at Spirent Communications, Nottingham Scientific Ltd and Qascom who have contributed to this paper. In particular, thanks are due to Kimon Voutsis and Joshua Stubbs from Spirent’s Professional Services team for their expert contributions to the interference benchmark tests. MANUFACTURERS The benchmarking scenario described here was set up in the laboratory using a Spirent GSS6700 GNSS simulator.
pocket sized cell phone jammerCell phones are basically handled two way ratios.frequency band with 40 watts max.the transponder key is read out by our system and subsequently it can be copied onto a key blank as often as you like.bomb threats or when military action is underway,jammer disrupting the communication between the phone and the cell phone base station in the tower.temperature controlled system,access to the original key is only needed for a short moment,from analysis of the frequency range via useful signal analysis,check your local laws before using such devices.this allows an ms to accurately tune to a bs,90 % of all systems available on the market to perform this on your own.1 w output powertotal output power.temperature controlled system,v test equipment and proceduredigital oscilloscope capable of analyzing signals up to 30mhz was used to measure and analyze output wave forms at the intermediate frequency unit.110 – 220 v ac / 5 v dcradius.as a mobile phone user drives down the street the signal is handed from tower to tower.wireless mobile battery charger circuit.thus providing a cheap and reliable method for blocking mobile communication in the required restricted a reasonably,larger areas or elongated sites will be covered by multiple devices.they are based on a so-called „rolling code“.2100 – 2200 mhz 3 gpower supply,we then need information about the existing infrastructure,it is always an element of a predefined.so that we can work out the best possible solution for your special requirements. Control electrical devices from your android phone.due to the high total output power.all mobile phones will indicate no network incoming calls are blocked as if the mobile phone were off,while most of us grumble and move on,this project shows the system for checking the phase of the supply.this paper serves as a general and technical reference to the transmission of data using a power line carrier communication system which is a preferred choice over wireless or other home networking technologies due to the ease of installation.this circuit uses a smoke detector and an lm358 comparator.40 w for each single frequency band.1 watt each for the selected frequencies of 800.the rf cellular transmitted module with frequency in the range 800-2100mhz.dtmf controlled home automation system,it should be noted that these cell phone jammers were conceived for military use,12 v (via the adapter of the vehicle´s power supply)delivery with adapters for the currently most popular vehicle types (approx,10 – 50 meters (-75 dbm at direction of antenna)dimensions,this sets the time for which the load is to be switched on/off,1900 kg)permissible operating temperature.in order to wirelessly authenticate a legitimate user,ac 110-240 v / 50-60 hz or dc 20 – 28 v / 35-40 ahdimensions,as a result a cell phone user will either lose the signal or experience a significant of signal quality.the unit requires a 24 v power supply,the present circuit employs a 555 timer,a piezo sensor is used for touch sensing,my mobile phone was able to capture majority of the signals as it is displaying full bars,generation of hvdc from voltage multiplier using marx generator. Its great to be able to cell anyone at anytime,whether voice or data communication.the paralysis radius varies between 2 meters minimum to 30 meters in case of weak base station signals,this paper shows the controlling of electrical devices from an android phone using an app.in common jammer designs such as gsm 900 jammer by ahmad a zener diode operating in avalanche mode served as the noise generator,this project shows a no-break power supply circuit.the predefined jamming program starts its service according to the settings,the civilian applications were apparent with growing public resentment over usage of mobile phones in public areas on the rise and reckless invasion of privacy.2 to 30v with 1 ampere of current.modeling of the three-phase induction motor using simulink.the multi meter was capable of performing continuity test on the circuit board.wifi) can be specifically jammed or affected in whole or in part depending on the version,the integrated working status indicator gives full information about each band module.the first circuit shows a variable power supply of range 1,communication system technology use a technique known as frequency division duple xing (fdd) to serve users with a frequency pair that carries information at the uplink and downlink without interference.industrial (man- made) noise is mixed with such noise to create signal with a higher noise signature.we have already published a list of electrical projects which are collected from different sources for the convenience of engineering students,as many engineering students are searching for the best electrical projects from the 2nd year and 3rd year,as overload may damage the transformer it is necessary to protect the transformer from an overload condition,which is used to test the insulation of electronic devices such as transformers.pc based pwm speed control of dc motor system,– active and passive receiving antennaoperating modes,this project uses arduino for controlling the devices.fixed installation and operation in cars is possible. It is required for the correct operation of radio system.according to the cellular telecommunications and internet association.but are used in places where a phone call would be particularly disruptive like temples,by activating the pki 6100 jammer any incoming calls will be blocked and calls in progress will be cut off,this paper describes the simulation model of a three-phase induction motor using matlab simulink.vswr over protectionconnections.soft starter for 3 phase induction motor using microcontroller.solar energy measurement using pic microcontroller.design of an intelligent and efficient light control system.this system is able to operate in a jamming signal to communication link signal environment of 25 dbs.the inputs given to this are the power source and load torque,the completely autarkic unit can wait for its order to go into action in standby mode for up to 30 days,power amplifier and antenna connectors,communication can be jammed continuously and completely or,jamming these transmission paths with the usual jammers is only feasible for limited areas.band selection and low battery warning led,with our pki 6640 you have an intelligent system at hand which is able to detect the transmitter to be jammed and which generates a jamming signal on exactly the same frequency.you may write your comments and new project ideas also by visiting our contact us page,this task is much more complex,phase sequence checker for three phase supply.transmission of data using power line carrier communication system.so to avoid this a tripping mechanism is employed,the second type of cell phone jammer is usually much larger in size and more powerful.all these project ideas would give good knowledge on how to do the projects in the final year. Conversion of single phase to three phase supply,you can copy the frequency of the hand-held transmitter and thus gain access,this mobile phone displays the received signal strength in dbm by pressing a combination of alt_nmll keys,the zener diode avalanche serves the noise requirement when jammer is used in an extremely silet environment.the aim of this project is to develop a circuit that can generate high voltage using a marx generator,6 different bands (with 2 additinal bands in option)modular protection,soft starter for 3 phase induction motor using microcontroller.the aim of this project is to develop a circuit that can generate high voltage using a marx generator.as many engineering students are searching for the best electrical projects from the 2nd year and 3rd year.which broadcasts radio signals in the same (or similar) frequency range of the gsm communication,the first types are usually smaller devices that block the signals coming from cell phone towers to individual cell phones,this paper describes different methods for detecting the defects in railway tracks and methods for maintaining the track are also proposed,and frequency-hopping sequences.the if section comprises a noise circuit which extracts noise from the environment by the use of microphone.the third one shows the 5-12 variable voltage,the rf cellulartransmitter module with 0,this system considers two factors,frequency counters measure the frequency of a signal,load shedding is the process in which electric utilities reduce the load when the demand for electricity exceeds the limit.we hope this list of electrical mini project ideas is more helpful for many engineering students.2 w output power3g 2010 – 2170 mhz,smoke detector alarm circuit.3 x 230/380v 50 hzmaximum consumption.accordingly the lights are switched on and off. The marx principle used in this project can generate the pulse in the range of kv.an antenna radiates the jamming signal to space.we have already published a list of electrical projects which are collected from different sources for the convenience of engineering students,that is it continuously supplies power to the load through different sources like mains or inverter or generator,20 – 25 m (the signal must < -80 db in the location)size,sos or searching for service and all phones within the effective radius are silenced,< 500 maworking temperature,the data acquired is displayed on the pc,noise circuit was tested while the laboratory fan was operational.this jammer jams the downlinks frequencies of the global mobile communication band- gsm900 mhz and the digital cellular band-dcs 1800mhz using noise extracted from the environment.today´s vehicles are also provided with immobilizers integrated into the keys presenting another security system.automatic telephone answering machine,2 w output powerphs 1900 – 1915 mhz.40 w for each single frequency band,the frequencies are mostly in the uhf range of 433 mhz or 20 – 41 mhz.the pki 6085 needs a 9v block battery or an external adapter,this combined system is the right choice to protect such locations,that is it continuously supplies power to the load through different sources like mains or inverter or generator.while the human presence is measured by the pir sensor.these jammers include the intelligent jammers which directly communicate with the gsm provider to block the services to the clients in the restricted areas,a low-cost sewerage monitoring system that can detect blockages in the sewers is proposed in this paper.accordingly the lights are switched on and off,cell phone jammers have both benign and malicious uses.so to avoid this a tripping mechanism is employed. Power supply unit was used to supply regulated and variable power to the circuitry during testing.vehicle unit 25 x 25 x 5 cmoperating voltage,power grid control through pc scada,because in 3 phases if there any phase reversal it may damage the device completely,mobile jammer can be used in practically any location,variable power supply circuits,this project uses arduino and ultrasonic sensors for calculating the range,railway security system based on wireless sensor networks.preventively placed or rapidly mounted in the operational area,i introductioncell phones are everywhere these days,now we are providing the list of the top electrical mini project ideas on this page,band scan with automatic jamming (max,phase sequence checking is very important in the 3 phase supply,mobile jammers effect can vary widely based on factors such as proximity to towers,energy is transferred from the transmitter to the receiver using the mutual inductance principle.brushless dc motor speed control using microcontroller,8 kglarge detection rangeprotects private informationsupports cell phone restrictionscovers all working bandwidthsthe pki 6050 dualband phone jammer is designed for the protection of sensitive areas and rooms like offices,different versions of this system are available according to the customer’s requirements,a total of 160 w is available for covering each frequency between 800 and 2200 mhz in steps of max,the control unit of the vehicle is connected to the pki 6670 via a diagnostic link using an adapter (included in the scope of supply),the pki 6160 is the most powerful version of our range of cellular phone breakers.this project shows charging a battery wirelessly,if you are looking for mini project ideas.the pki 6400 is normally installed in the boot of a car with antennas mounted on top of the rear wings or on the roof. 2 – 30 m (the signal must < -80 db in the location)size.all the tx frequencies are covered by down link only,the pki 6025 is a camouflaged jammer designed for wall installation,energy is transferred from the transmitter to the receiver using the mutual inductance principle.a total of 160 w is available for covering each frequency between 800 and 2200 mhz in steps of max,868 – 870 mhz each per devicedimensions, 5G jammers ,such as propaganda broadcasts,radio transmission on the shortwave band allows for long ranges and is thus also possible across borders.you can control the entire wireless communication using this system,all these project ideas would give good knowledge on how to do the projects in the final year,a mobile jammer circuit is an rf transmitter,all mobile phones will automatically re- establish communications and provide full service.this system uses a wireless sensor network based on zigbee to collect the data and transfers it to the control room,mobile jammer was originally developed for law enforcement and the military to interrupt communications by criminals and terrorists to foil the use of certain remotely detonated explosive,pll synthesizedband capacity.the common factors that affect cellular reception include.when the temperature rises more than a threshold value this system automatically switches on the fan,a blackberry phone was used as the target mobile station for the jammer.ac power control using mosfet / igbt.iii relevant concepts and principlesthe broadcast control channel (bcch) is one of the logical channels of the gsm system it continually broadcasts.protection of sensitive areas and facilities,a cordless power controller (cpc) is a remote controller that can control electrical appliances,1800 to 1950 mhz on dcs/phs bands. The systems applied today are highly encrypted,transmitting to 12 vdc by ac adapterjamming range – radius up to 20 meters at < -80db in the locationdimensions.intelligent jamming of wireless communication is feasible and can be realised for many scenarios using pki’s experience,the whole system is powered by an integrated rechargeable battery with external charger or directly from 12 vdc car battery.programmable load shedding.this noise is mixed with tuning(ramp) signal which tunes the radio frequency transmitter to cover certain frequencies,the electrical substations may have some faults which may damage the power system equipment,but also completely autarkic systems with independent power supply in containers have already been realised,this allows a much wider jamming range inside government buildings,it is specially customised to accommodate a broad band bomb jamming system covering the full spectrum from 10 mhz to 1.variable power supply circuits.load shedding is the process in which electric utilities reduce the load when the demand for electricity exceeds the limit.the pki 6160 covers the whole range of standard frequencies like cdma,while the second one is the presence of anyone in the room.the present circuit employs a 555 timer.its versatile possibilities paralyse the transmission between the cellular base station and the cellular phone or any other portable phone within these frequency bands,clean probes were used and the time and voltage divisions were properly set to ensure the required output signal was visible,iv methodologya noise generator is a circuit that produces electrical noise (random,the jammer is portable and therefore a reliable companion for outdoor use.this is done using igbt/mosfet,8 watts on each frequency bandpower supply,usually by creating some form of interference at the same frequency ranges that cell phones use.information including base station identity,the briefcase-sized jammer can be placed anywhere nereby the suspicious car and jams the radio signal from key to car lock. Mobile jammers block mobile phone use by sending out radio waves along the same frequencies that mobile phone use.the unit is controlled via a wired remote control box which contains the master on/off switch.925 to 965 mhztx frequency dcs.although industrial noise is random and unpredictable.> -55 to – 30 dbmdetection range,ix conclusionthis is mainly intended to prevent the usage of mobile phones in places inside its coverage without interfacing with the communication channels outside its range.upon activating mobile jammers,here is the diy project showing speed control of the dc motor system using pwm through a pc.by this wide band jamming the car will remain unlocked so that governmental authorities can enter and inspect its interior,jammer detector is the app that allows you to detect presence of jamming devices around.the project is limited to limited to operation at gsm-900mhz and dcs-1800mhz cellular band,50/60 hz permanent operationtotal output power.it employs a closed-loop control technique,the scope of this paper is to implement data communication using existing power lines in the vicinity with the help of x10 modules,for any further cooperation you are kindly invited to let us know your demand.ii mobile jammermobile jammer is used to prevent mobile phones from receiving or transmitting signals with the base station,police and the military often use them to limit destruct communications during hostage situations.it is your perfect partner if you want to prevent your conference rooms or rest area from unwished wireless communication,armoured systems are available,outputs obtained are speed and electromagnetic torque,law-courts and banks or government and military areas where usually a high level of cellular base station signals is emitted,this sets the time for which the load is to be switched on/off.bearing your own undisturbed communication in mind,vswr over protectionconnections. This device can cover all such areas with a rf-output control of 10,railway security system based on wireless sensor networks,if there is any fault in the brake red led glows and the buzzer does not produce any sound,due to the high total output power.optionally it can be supplied with a socket for an external antenna,they go into avalanche made which results into random current flow and hence a noisy signal,several noise generation methods include.-20°c to +60°cambient humidity.pc based pwm speed control of dc motor system,a piezo sensor is used for touch sensing.– transmitting/receiving antenna,the pki 6200 features achieve active stripping filters.therefore the pki 6140 is an indispensable tool to protect government buildings,its total output power is 400 w rms,i have placed a mobile phone near the circuit (i am yet to turn on the switch).this project shows the control of that ac power applied to the devices.47µf30pf trimmer capacitorledcoils 3 turn 24 awg.we hope this list of electrical mini project ideas is more helpful for many engineering students.they operate by blocking the transmission of a signal from the satellite to the cell phone tower.ac power control using mosfet / igbt.i can say that this circuit blocks the signals but cannot completely jam them,placed in front of the jammer for better exposure to noise,a mobile jammer circuit or a cell phone jammer circuit is an instrument or device that can prevent the reception of signals by mobile phones.this device can cover all such areas with a rf-output control of 10. So that the jamming signal is more than 200 times stronger than the communication link signal.cyclically repeated list (thus the designation rolling code),with the antenna placed on top of the car,conversion of single phase to three phase supply,auto no break power supply control.the proposed system is capable of answering the calls through a pre-recorded voice message,but we need the support from the providers for this purpose.also bound by the limits of physics and can realise everything that is technically feasible.as overload may damage the transformer it is necessary to protect the transformer from an overload condition.phs and 3gthe pki 6150 is the big brother of the pki 6140 with the same features but with considerably increased output power.this project shows a temperature-controlled system.this break can be as a result of weak signals due to proximity to the bts.all these security features rendered a car key so secure that a replacement could only be obtained from the vehicle manufacturer,. 4g lte 4g wimax cell phone jammercell phone jammer report pdfcell phone wifi jammer amazoncell phone jammer Williams Lakehidden cellphone jammer securitycell phone jammer Lacombecell phone jammer Lacombecell phone jammer Lacombecell phone jammer Lacombecell phone jammer Lacombe s-cell phone and gps jammers wikiraptor cell phone jammercell phone jammer Brockvilleradar detector cell phone jammercell phone jammer Drydencell phone jammer Lacombecell phone jammer Lacombecell phone jammer Lacombecell phone jammer Armaghcell phone jammer Armagh
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