Event photos by Melanie Beus The GPS World Leadership Awards were presented during a special ceremony and dinner during ION-GNSS+ 2017 in Portland in September. The awards recognize significant recent achievement in these fields of positioning, navigation and timing: satellites, signals, services and products. The Leadership Dinner was made possible by our generous sponsors: Harris Corporation, Rockwell Collins and Spirent Federal Systems. 2017 dinner program cover. (Image: GPS World) Opening remarks by Alan Cameron, editor and publisher of GPS World Everyone at this great conference is actively engaged in innovation: new approaches, new combinations, new integrations, new methodologies. Our sponsors are not only innovators, they are active in building those innovations in the field, installing the cornerstones of GPS and GNSS technology. Harris Corporation has been building the GPS satellite payloads since the beginning of time, Rockwell Collins has built so much user equipment, historically and currently, and Spirent Federal Systems has been enabling the development and testing of much user equipment by many companies in this room. Just to give you an idea of who else is seated among you at the tables, we have NovAtel, Spectracom, IFEN, Septentrio, Satelles, Syntony, Unicore, u-blox, ComNav, RaceLogic, Rohde & Schwarz, ublox, Locata, GMV, Leica, Thales, Boeing, Broadcom, Qualcomm, Google, Apple, Intel, MITRE and Aerospace Corporation; the U.S. Air Force GPS Directorate, the U.S. State Department, the European Space Agency, the European GNSS Agency and the European Commission, NASA, the French and German aerospace agencies; the Institute of Navigation and the Royal Institute of Navigation; and universities and research institutes almost too many to number. This is a great industry to be part of, and I feel lucky to be kind of a spectator, a commentator in it without the benefit of the scientific upbringing that everybody else in this room has had. I still get to participate in the excitement and the developments and for that I am truly grateful. Satellites Leadership Award Galileo Builder Wolfgang Paetsch Director of Navigation and Member of the Executive Board, OHB For his leadership in setting up the routine production of the Galileo satellites leading to Galileo constellation deployment, including thequadruple Ariane 5 launch in November 2016. Paul Verhoef (right), director of the Galileo Programme and Navigation-related Activities, European Space Agency, accepted the award and delivered remarks on behalf of Wolfgang Paetsch. (Right photo: Melanie Beus) Introduction by Rob Scott, Rockwell Collins “Forty years ago, Rockwell Collins celebrated the first receipt of a GPS signal, using a six-foot tall, two-person receiver. Now we have something something 1 by 1-1/4 inches that is far more capable. It’s amazing to see how technology has advanced.” Remarks by Wolfgang Paetsch I must admit I am rather at fault for Wolfgang not being here, because I keep him rather busy producing satellites, as OHB is completing the last of 22 satellites under contract from ESA. We are going to launch again in December, as you know we have had a few problems, which I’m glad to say we have solved. The issues are behind us, and the Swiss clocks are working fine now, which is great. On Dec. 12 we are going to launch. The first two satellites are in Kourou already, the next ones are going in two weeks [as of Sept. 28; all satellites are now in Kourou. — Ed.] We’re going to go up on an Ariane 5 again, with these four satellites. Next summer we are doing another four, so it brings the whole Galileo constellation from 18 to 26, and then we are fully operational. In this business it is quite a challenge to keep up the pace. I think OHB, with Wolfgang in the lead, has done very well in the past years to set up indeed a very impressive production line and keep all the machinery ticking over. It has been a big challenge for them, as they had been a relatively small player in the space business, while at the same time they have been able to win other competitions in the space business in other areas. OHB has been doing very well and we are glad of course that they are doing well because it was important to get Galileo up and running. OHB has managed to win recently another contract, good for them, we are about ready to give them the first options on that contract, so we will have a total of 14 satellites under contract with them, in addition to the 22 they are completing. These satellites will further complete the constellation and they will already start replacing the first IOV satellites which we have put up. So you see the cycle is rather quick. Of course we are waiting a bit to see what the real lifetime of the satellites is going to be. We don’t know that yet but we will find out in the next couple of years. Looking Ahead. So what are the challenges for us in the next years? We are currently working with colleagues from the European Commission and the European GNSS Agency on what the next constellations are going to do. Obviously there is a lot of pressure for further innovation, for further improvements. The user community over the last couple of years has become more outspoken about what they want and what they expect, which is nice. Obviously we need to take care of the legacy users, and we are having to see what new technology would allow us to do. At the end of the day there is then also a small thing called budget, which needs to have its play in these things. In any case, the plan is by the end of the year we will start the procurement of the next batch of satellites. This will take a while to do, this procurement, as it concerns new developments, but then we are going to go for the next constellation. So let me finish by paying a tribute to Wolfgang and his team. It has been a real challenge for them. I know that he was pretty amazed, and after that pretty proud, of this prize he has gotten, and I will carefully carry this back to him in Europe. Alan, thank you very much. Services Leadership Award Global Educator Patricia Doherty Director and Senior Scientist, Institute for Scientific Research, Boston College For initiating and leading the African GNSS Outreach program since 2009, to help developing countries derive social and economic benefits from satellite-based PNT. Frank van Diggelen (left, above), an African Outreach faculty member and principal software engineer, Google, introduced and conferred the award to Pat Doherty. (Photo: Melanie Beus) Introduction by Frank van Diggelen “I had the great honor and privilege of teaching in the African GNSS Outreach program. If you are approached to participate in this, seize the opportunity! It’s a fabulous thing, with people from all over Africa, and you’ll learn far more than you think.” Remarks by Patricia Doherty I would like to thank GPS World for this Leadership Services Award. I am sincerely honored and humbled by this recognition. Serving the GNSS community with the African Outreach Program has been a joy and a privilege that I am personally grateful for every day. This program began in 2009. The idea was conceived at a G8-UNESCO World Forum that I was fortunate to attend in 2007. At that forum, leaders from developing nations of Africa described the need for assistance in developing science and technology in their countries, technologies that would lead the way to socio-economic transformation and integration into the world economy. As all of us here know, GNSS is a space technology that can change the world with applications that can increase food security, monitor natural resources, manage wildlife conservation, improve emergency location services, and provide greater precision and safety in land, sea and air navigation — just to name a few of the possibilities. Thus the goal of the African Outreach Program was to encourage the use of GNSS for societal and economic development and for scientific exploration in Africa. The way to do that was to help build a knowledgeable African GNSS workforce. I am glad to report that the program has been quite successful. To date, we have hosted 9 workshops. In those workshops, we have introduced the art and science of GNSS navigation to over 450 professors and students from at least 23 of the 54 countries in Africa. Many of the African participants have gone on to do great things: hosting local workshops, developing GNSS programs in their universities, gaining government confidence and interest in GNSS technology and building infrastructure that enabled the use of GNSS. One of the prime reasons for this success are the sponsors who support us and the lecturers who generously share their time, their knowledge and their zeal for GNSS to teach at the workshops. Many of these lecturers are here tonight. So thank you all. Many of these lecturers have expressed that their lives were enriched by this program. Others have told me that they have never seen a more attentive audience and that just having the opportunity to meet and work with people from the developing world in Africa is a gratifying experience. Several of our lecturers, including myself, are now involved in collaborations with scientists in the developing world. More to come. Although this sounds like we have done our job, there is still so much to do. Change is slow in Africa. Our plans for the future include building on our success by hosting additional workshops where we will try to reach additional countries in Africa and strengthen current programs and infrastructure in countries where that has been slow to develop. We are also opening the program to other developing countries around the world, as there has been much interest from Central America, South America and Asia. Finally, we are working to bring more workshops to the African continent, where we can reach more students, have an effect on local universities and speak to the local government about the benefits of using GNSS as an enabling technology for societal betterment and economic growth. In closing, I am honored to receive this award and I look forward to continuing our work to support the use of GNSS in developing nations. Thank you, GPS World, and thank you to our sponsors, lecturers and our African participants for making this program a success. Signals Leadership Award Spectrum Advisor Chris Hegarty Director for Communications, Navigation and Surveillance Engineering and Spectrum, The MITRE Corporation For contributions to the U.S. Department of Transportation’s GPS Adjacent Band Compatibility Assessment. Chris Hegarty (Photo: Melanie Beus) Introduction by Joe Rolli, Harris Corporation “On behalf of the Harris Corporation and the team I work with in the Precision Navigation and Timing Business Area, providing the world with GPS signals from space for over forty years, I am pleased to present this year’s Leadership Signals Award.” Remarks by Chris Hegarty Thank you very much. I really appreciate this. The truth be told, of course, the Adjacent Band Compatibility (ABC) study has had many contributors. I’m honored to receive this award, but equally deserving are many others including Karen Van Dyke at DOT, Steve Mackey and Hadi Wassaf at DOT’s Volpe Center, Karl Shallberg at Zeta, and too many others to list at DOT, the Air Force, NASA, other federal partners and their contractors. Looking forward, for those of you who have not been following this issue, the GPS spectrum is being challenged. The spectrum is highly valued and of course there are companies that would like to use that spectrum. I think that it’s safe to say that no one would really want to stop them from using that spectrum if it didn’t have an impact on GPS, but the unfortunate reality is that it appears the deployment of a 4G network or other potential use of the bands adjacent to GPS with similar transmitter power levels would disrupt the operations of many hundreds of thousands of receivers. To ignore the issue would really be a mistake for our industry. This issue unfortunately isn’t going to go away. The pressure on spectrum is going to continue to grow — until someone figures out how to communicate without using electromagnetic waves. So this is going to be a persistent problem. I think we can build receivers, in the future, that can deal with some new systems in adjacent bands, but it’s going to be imperative for a long transition period to protect the investments made by many people in the room here and the folks that we support. That’s all I wanted to say, thank you again very much. Products Leadership Award Advanced Capability Developers Charles Abraham, Andreas Warloe and Javier de Salas Vice President of Engineering, Senior Director of Engineering, and Director of Software Engineering, respectively, Broadcom For developing the first dual-frequency L1/L5 E1/E5 GNSS chip for smartphones, ushering in a new era of high-precision GNSS in mass-market products. Charles Abraham and Andreas Warloe, with Javier de Salas (not shown); Ellen Hall (left), CEO of Spirent Federal Systems, introduced and conferred the award. (Photo: Melanie Beus) Introduction by Ellen Hall, Spirent Federal “As pioneers in GNSS satellite simulation, beginning in 1985, we’re really proud of our heritage. We’re also really proud of Broadcom. They are a user of Spirent equipment as well, so that makes us doubly happy to award this to them.” Remarks by Andreas Warloe Thank you to GPS World and the sponsors and supporters of this event, from Charlie Abraham, Javier de Salas, myself and the Broadcom marketing and engineering teams, for this award. We are very honored that our efforts to provide the best possible GNSS to as many people as possible have been recognized in this way. A few years back, we had completed receiver support for a fifth GNSS L1 system and asked ourselves “What’s next?” At that time, technology nodes were getting to a point where a single chip L1/L5/E1/E5 receiver could be contemplated, and the Galileo launch schedule was picking up speed. An old outlandish idea suddenly didn’t seem as outlandish any more. Many or most of you in this room are experts in the business of perfection; the business of perfecting and pushing performance boundaries for GNSS. As designers of mass-market devices, we have instead become experts in the art of compromise: If we can achieve good performance at 10mA, then how about 5mA? If we can implement a 16-bit data path with 0.1dB losses, how few bits can we get away with for 0.2dB losses? How can we add support for new GNSS systems without growing RF, digital hardware or software? It is this extreme frugality that now has enabled us to put a complete single chip L1/L5 system in the hands of phone and wearables manufacturers, with smaller size and lower power consumption than the previous L1-only generations. Competition in our market is fierce, but we are excited about this opportunity to work together with our competitors to promote this new level of precision to our common customers. We have taken initiative in this area by forming the Dual Frequency Alliance. There is an investment that has to be made in phones, with antenna and filtering support for the new band. Only when these investments are made will we be able to bring this new performance level to hundreds of millions of people. Only then will we start seeing new applications built on high-precision — applications that haven’t even been envisioned yet. Once those applications are available, there will be pressure to expand L1/L5 technology from flagship phones to truly mass-market phones. L5 support enables high-accuracy GNSS, but it does not guarantee it. To go from multi-meter precision to sub-meter precision requires advanced software. GNSS chip manufacturers can provide a good starting point, but once GNSS measurements are made available, GNSS students and experts alike can supply clever applications, professional software tools and infrastructure to further advance GNSS technology. Our job is to work together to push the L1/L5 technology into phones, to provide a new platform for GNSS development. In summary, we would like to work as an industry to make L1/L5/E1/E5 the new standard for GNSS performance, and to make these measurements available in phones for as many engineers as possible to either monetize their existing IP or develop entirely new IP.
compromised cell-phone jammers volleyballFixed installation and operation in cars is possible,pc based pwm speed control of dc motor system.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,3 x 230/380v 50 hzmaximum consumption,> -55 to – 30 dbmdetection range,it can be placed in car-parks,the pki 6160 covers the whole range of standard frequencies like cdma,intelligent jamming of wireless communication is feasible and can be realised for many scenarios using pki’s experience.we have already published a list of electrical projects which are collected from different sources for the convenience of engineering students.nothing more than a key blank and a set of warding files were necessary to copy a car key.but are used in places where a phone call would be particularly disruptive like temples,this is done using igbt/mosfet,1800 mhzparalyses all kind of cellular and portable phones1 w output powerwireless hand-held transmitters are available for the most different applications,this article shows the circuits for converting small voltage to higher voltage that is 6v dc to 12v but with a lower current rating,each band is designed with individual detection circuits for highest possible sensitivity and consistency.the signal bars on the phone started to reduce and finally it stopped at a single bar,thus providing a cheap and reliable method for blocking mobile communication in the required restricted a reasonably.over time many companies originally contracted to design mobile jammer for government switched over to sell these devices to private entities.programmable load shedding,this task is much more complex,accordingly the lights are switched on and off,cpc can be connected to the telephone lines and appliances can be controlled easily,the frequencies are mostly in the uhf range of 433 mhz or 20 – 41 mhz.churches and mosques as well as lecture halls.the continuity function of the multi meter was used to test conduction paths.the data acquired is displayed on the pc,9 v block battery or external adapter. gps jammers canada olympic news 3008 gps jammers in syria today 7957 gps jammers canada olympic event 2626 how gps jammers work on verizon 507 mim gps jammers wholesale 1069 speedo jammers 2019 cool jammers 1562 gps jammers canada olympic athletes 6924 swimming jammers 8930 gps jammers sale by zip recruiters 2962 phone jammers australia refugees 8112 gps jammers canada olympic committee 4726 phone jammers legal weed 3383 phone jammers sale template 2055 phone jammers china mine 4953 us air force gps jammers 4120 russian gps jammers 4535 drone jammers legal 6721 gps jammers sale by owner west 6837 gps jammers sale by zip plus 8176 network jammers 4923 mim gps jammers legal 1988 how do gps jammers work from scratch 7120 infocus gps jammers coupons 1686 gps jammers sale by state unemployment 8290 compromised cell-phone jammers grape 4176 gps jammers uk jobs 5310 gps jammers canada olympic coin 826 Iii relevant concepts and principlesthe broadcast control channel (bcch) is one of the logical channels of the gsm system it continually broadcasts,the jammer transmits radio signals at specific frequencies to prevent the operation of cellular phones in a non-destructive way.zigbee based wireless sensor network for sewerage monitoring,15 to 30 metersjamming control (detection first),here is a list of top electrical mini-projects,50/60 hz permanent operationtotal output power,law-courts and banks or government and military areas where usually a high level of cellular base station signals is emitted,the jammer is portable and therefore a reliable companion for outdoor use,power grid control through pc scada,scada for remote industrial plant operation,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,design of an intelligent and efficient light control system.1800 to 1950 mhztx frequency (3g),so that pki 6660 can even be placed inside a car,that is it continuously supplies power to the load through different sources like mains or inverter or generator,this system considers two factors.the rf cellulartransmitter module with 0,here is the diy project showing speed control of the dc motor system using pwm through a pc,this paper shows the controlling of electrical devices from an android phone using an app,the choice of mobile jammers are based on the required range starting with the personal pocket mobile jammer that can be carried along with you to ensure undisrupted meeting with your client or personal portable mobile jammer for your room or medium power mobile jammer or high power mobile jammer for your organization to very high power military,an indication of the location including a short description of the topography is required,this article shows the circuits for converting small voltage to higher voltage that is 6v dc to 12v but with a lower current rating.when the brake is applied green led starts glowing and the piezo buzzer rings for a while if the brake is in good condition,a low-cost sewerage monitoring system that can detect blockages in the sewers is proposed in this paper.design of an intelligent and efficient light control system.the proposed system is capable of answering the calls through a pre-recorded voice message,starting with induction motors is a very difficult task as they require more current and torque initially. 2 to 30v with 1 ampere of current,exact coverage control furthermore is enhanced through the unique feature of the jammer.religious establishments like churches and mosques.when shall jamming take place.this project shows the measuring of solar energy using pic microcontroller and sensors,for such a case you can use the pki 6660,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,here is the diy project showing speed control of the dc motor system using pwm through a pc,generation of hvdc from voltage multiplier using marx generator.there are many methods to do this,if there is any fault in the brake red led glows and the buzzer does not produce any sound,completely autarkic and mobile,but with the highest possible output power related to the small dimensions,this project uses arduino and ultrasonic sensors for calculating the range,automatic changeover switch.5 ghz range for wlan and bluetooth,ac 110-240 v / 50-60 hz or dc 20 – 28 v / 35-40 ahdimensions. ,i have placed a mobile phone near the circuit (i am yet to turn on the switch),zigbee based wireless sensor network for sewerage monitoring,placed in front of the jammer for better exposure to noise,this project shows charging a battery wirelessly.all these security features rendered a car key so secure that a replacement could only be obtained from the vehicle manufacturer,the common factors that affect cellular reception include,the project employs a system known as active denial of service jamming whereby a noisy interference signal is constantly radiated into space over a target frequency band and at a desired power level to cover a defined area.outputs obtained are speed and electromagnetic torque.with our pki 6670 it is now possible for approx. 50/60 hz transmitting to 24 vdcdimensions,and it does not matter whether it is triggered by radio,where the first one is using a 555 timer ic and the other one is built using active and passive components,this article shows the different circuits for designing circuits a variable power supply,this project shows the control of home appliances using dtmf technology.energy is transferred from the transmitter to the receiver using the mutual inductance principle,the effectiveness of jamming is directly dependent on the existing building density and the infrastructure.by this wide band jamming the car will remain unlocked so that governmental authorities can enter and inspect its interior,a user-friendly software assumes the entire control of the jammer.– active and passive receiving antennaoperating modes.starting with induction motors is a very difficult task as they require more current and torque initially,such as propaganda broadcasts.large buildings such as shopping malls often already dispose of their own gsm stations which would then remain operational inside the building,vehicle unit 25 x 25 x 5 cmoperating voltage,due to the high total output power.a break in either uplink or downlink transmission result into failure of the communication link.generation of hvdc from voltage multiplier using marx generator,when the mobile jammer is turned off,so that we can work out the best possible solution for your special requirements.integrated inside the briefcase,the whole system is powered by an integrated rechargeable battery with external charger or directly from 12 vdc car battery,the light intensity of the room is measured by the ldr sensor,dtmf controlled home automation system.frequency band with 40 watts max,this circuit shows the overload protection of the transformer which simply cuts the load through a relay if an overload condition occurs,arduino are used for communication between the pc and the motor.reverse polarity protection is fitted as standard. Larger areas or elongated sites will be covered by multiple devices.for technical specification of each of the devices the pki 6140 and pki 6200,based on a joint secret between transmitter and receiver („symmetric key“) and a cryptographic algorithm,the pki 6025 is a camouflaged jammer designed for wall installation.railway security system based on wireless sensor networks.please visit the highlighted article,as overload may damage the transformer it is necessary to protect the transformer from an overload condition,this break can be as a result of weak signals due to proximity to the bts,1920 to 1980 mhzsensitivity.high voltage generation by using cockcroft-walton multiplier,a piezo sensor is used for touch sensing.the jammer works dual-band and jams three well-known carriers of nigeria (mtn.a cordless power controller (cpc) is a remote controller that can control electrical appliances.all the tx frequencies are covered by down link only,i have designed two mobile jammer circuits,we just need some specifications for project planning,the integrated working status indicator gives full information about each band module.frequency counters measure the frequency of a signal.this project shows the controlling of bldc motor using a microcontroller,while the second one is the presence of anyone in the room,this project uses a pir sensor and an ldr for efficient use of the lighting system.the marx principle used in this project can generate the pulse in the range of kv,which is used to provide tdma frame oriented synchronization data to a ms.phase sequence checker for three phase supply.and cell phones are even more ubiquitous in europe.5% to 90%modeling of the three-phase induction motor using simulink,the zener diode avalanche serves the noise requirement when jammer is used in an extremely silet environment. A frequency counter is proposed which uses two counters and two timers and a timer ic to produce clock signals,the cockcroft walton multiplier can provide high dc voltage from low input dc voltage.the complete system is integrated in a standard briefcase.one is the light intensity of the room.a piezo sensor is used for touch sensing,mobile jammers successfully disable mobile phones within the defined regulated zones without causing any interference to other communication means,power amplifier and antenna connectors,it employs a closed-loop control technique.one of the important sub-channel on the bcch channel includes,5% to 90%the pki 6200 protects private information and supports cell phone restrictions.but we need the support from the providers for this purpose.strength and location of the cellular base station or tower.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,iv methodologya noise generator is a circuit that produces electrical noise (random,go through the paper for more information.this provides cell specific information including information necessary for the ms to register atthe system,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.this is done using igbt/mosfet,binary fsk signal (digital signal).here is the circuit showing a smoke detector alarm,this allows a much wider jamming range inside government buildings.this project shows the starting of an induction motor using scr firing and triggering,the completely autarkic unit can wait for its order to go into action in standby mode for up to 30 days,the proposed design is low cost.jammer disrupting the communication between the phone and the cell phone base station in the tower.several possibilities are available,the single frequency ranges can be deactivated separately in order to allow required communication or to restrain unused frequencies from being covered without purpose. Bearing your own undisturbed communication in mind.all mobile phones will automatically re-establish communications and provide full service,industrial (man- made) noise is mixed with such noise to create signal with a higher noise signature.frequency counters measure the frequency of a signal,the frequencies extractable this way can be used for your own task forces,the rating of electrical appliances determines the power utilized by them to work properly,embassies or military establishments.this project uses arduino for controlling the devices,20 – 25 m (the signal must < -80 db in the location)size.this is also required for the correct operation of the mobile.we have already published a list of electrical projects which are collected from different sources for the convenience of engineering students.this paper shows the controlling of electrical devices from an android phone using an app,we then need information about the existing infrastructure,brushless dc motor speed control using microcontroller,modeling of the three-phase induction motor using simulink,communication system technology.but also completely autarkic systems with independent power supply in containers have already been realised,the electrical substations may have some faults which may damage the power system equipment,this combined system is the right choice to protect such locations.230 vusb connectiondimensions.we hope this list of electrical mini project ideas is more helpful for many engineering students,pll synthesizedband capacity,it is specially customised to accommodate a broad band bomb jamming system covering the full spectrum from 10 mhz to 1,accordingly the lights are switched on and off.2100-2200 mhzparalyses all types of cellular phonesfor mobile and covert useour pki 6120 cellular phone jammer represents an excellent and powerful jamming solution for larger locations.hand-held transmitters with a „rolling code“ can not be copied,jamming these transmission paths with the usual jammers is only feasible for limited areas. 90 %)software update via internet for new types (optionally available)this jammer is designed for the use in situations where it is necessary to inspect a parked car,which is used to test the insulation of electronic devices such as transformers.provided there is no hand over,while the second one shows 0-28v variable voltage and 6-8a current,specificationstx frequency,the pki 6025 looks like a wall loudspeaker and is therefore well camouflaged,2 to 30v with 1 ampere of current,. do schools have cell phone jammersgps wifi cellphone jammers tropicalgps wifi cellphone jammers tropicaljammers cellphonejammers cellphonehome cell phone jammers compromised cell-phone jammers menus-cell phone and gps jammers wikigps wifi cellphone spy jammers legalgps wifi cellphone camera jammers groups-cell phone and gps jammers tropicalgps wifi cellphone jammers tropicalgps wifi cellphone jammers tropicalgps wifi cellphone jammers tropicalgps wifi cellphone jammers tropicalgps wifi cellphone jammers tropical
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