Wifi signal jammer equipment | wifi signal jammer uk

Mitigation Through Adaptive Filtering for Machine Automation Applications By Luis Serrano, Don Kim, and Richard B. Langley Multipath is real and omnipresent, a detriment when GPS is used for positioning, navigation, and timing. The authors look at a technique to reduce multipath by using a pair of antennas on a moving vehicle together with a sophisticated mathematical model. This reduces the level of multipath on carrier-phase observations and thereby improves the accuracy of the vehicle’s position. INNOVATION INSIGHTS by Richard Langley “OUT, DAMNED MULTIPATH! OUT, I SAY!” Many a GPS user has wished for their positioning results to be free of the effect of multipath. And unlike Lady Macbeth’s imaginary blood spot, multipath is real and omnipresent. Although it may be considered beneficial when GPS is used as a remote sensing tool, it is a detriment when GPS is used for positioning, navigation, and timing — reducing the achievable accuracy of results. Clearly, the best way to reduce the effects of multipath is to try avoiding it in the first place by siting the receiver’s antenna as low as possible and far away from potential reflectors. But that’s not always feasible. The next best approach is to reduce the level of the multipath signal entering the receiver by attenuating it with a suitably designed antenna. A large metallic ground plane placed beneath an antenna will modify the shape of the antenna’s reception pattern giving it reduced sensitivity to signals arriving at low elevation angles and from below the antenna’s horizon. So-called choke-ring antennas also significantly attenuate multipath signals. And microwave-absorbing materials appropriately placed in an antenna’s vicinity can also be beneficial. Multipath can also be mitigated by special receiver correlator designs. These designs target the effect of multipath on code-phase measurements and the resulting pseudorange observations. Several different proprietary implementations in commercial receivers significantly reduce the level of multipath in the pseudoranges and hence in pseudorange-based position and time estimates. Some degree of multipath attenuation can be had by using the low-noise carrier-phase measurements to smooth the pseudoranges before they are processed. The effect of multipath on carrier phases is much smaller than that on pseudoranges. In fact, it is limited to only one-quarter of the carrier wavelength when the reflected signal’s amplitude is less than that of the direct signal. This means that at the GPS L1 frequency, the multipath contamination in a carrier-phase measurement is at most about 5 centimeters. Nevertheless, this is still unacceptably large for some high-accuracy applications. At a static site, with an unchanging multipath environment, the signal reflection geometry repeats day to day and the effect of multipath can be reduced by sidereal filtering or “stacking” of coordinate or carrier-phase-residual time series. However, this approach is not viable for scenarios where the receiver and antenna are moving such as in machine control applications. Here an alternative approach is needed. In this month’s column, I am joined by two of my UNB colleagues as we look at a technique that uses a pair of antennas on a moving vehicle together with a sophisticated mathematical model, to reduce the level of multipath on carrier-phase observations and thereby improve the accuracy of the vehicle’s position. Real-time-kinematic (RTK) GNSS-based machine automation systems are starting to appear in the construction and mining industries for the guidance of dozers, motor graders, excavators, and scrapers and in precision agriculture for the guidance of tractors and harvesters. Not only is the precise and accurate position of the vehicle needed but its attitude is frequently required as well. Previous work in GNSS-based attitude systems, using short baselines (less than a couple of meters) between three or four antennas, has provided results with high accuracies, most of the time to the sub-degree level in the attitude angles. If the relative position of these multiple antennas can be determined with real-time centimeter-level accuracy using the carrier-phase observables (thus in RTK-mode), the three attitude parameters (the heading, pitch, and roll angles) of the platform can be estimated. However, with only two GNSS antennas it is still possible to determine yaw and pitch angles, which is sufficient for some applications in precision agriculture and construction. Depending on the placement of the antennas on the platform body, the determination of these two angles can be quite robust and efficient. Nevertheless, even a small separation between the antennas results in different and decorrelated phase-multipath errors, which are not removed by simply differencing measurements between the antennas. The mitigation of carrier-phase multipath in real time remains, to a large extent, very limited (unlike the mitigation of code multipath through receiver improvements) and it is commonly considered the major source of error in GNSS-RTK applications. This is due to the very nature of multipath spectra, which depends mainly on the location of the antenna and the characteristics of the reflector(s) in its vicinity. Any change in this binomial (antenna/reflectors), regardless of how small it is, will cause an unknown multipath effect. Using typical choke-ring antennas to reduce multipath is typically not practical (not to mention cost prohibitive) when employing multiple antennas on dynamic platforms. Extended flat ground planes are also impractical. Furthermore, such antenna configurations typically only reduce the effects of low angle reflections and those coming from below the antenna horizon. One promising approach to mitigating the effects of carrier-phase multipath is to filter the raw measurements provided by the receiver. But, unlike the scenario at a fixed site, the multipath and its effects are not repeatable. In machine automation applications, the machinery is expected to perform complex and unpredictable maneuvers; therefore the removal of carrier-phase multipath should rely on smart digital filtering techniques that adapt not only to the background multipath (coming mostly from the machine’s reflecting surfaces), but also to the changing multipath environment along the machine’s path. In this article, we describe how a typical GPS-based machine automation application using a dual-antenna system is used to calibrate, in a first step, and then remove carrier-phase multipath afterwards. The intricate dynamical relationship between the platform’s two “rover” antennas and the changing multipath from nearby reflectors is explored and modeled through several stochastic and dynamical models. These models have been implemented in an extended Kalman filter (EKF). MIMICS Strategy Any change in the relative position between a pair of GNSS antennas most likely will affect, at a small scale, the amplitude and polarization of the reflected signals sensed by the antennas (depending on their spacing). However, the phase will definitely change significantly along the ray trajectories of the plane waves passing through each of the antennas. This can be seen in the equation that describes the single-difference multipath between two close-by antennas (one called the “master” and the other the “slave”):   (1) where the angle  is the relative multipath phase delay between the antennas and a nearby effective reflector (α0 is the multipath signal amplitude in the master and slave antennas, and is dependent on the reflector characteristics, reflection coefficient, and receiver tracking loop). As our study has the objective to mimic as much as possible the multipath effect from effective reflectors in kinematic scenarios with variable dynamics, we decided to name the strategy MIMICS, a slightly contrived abbreviation for “Multipath profile from between receIvers dynaMICS.” The MIMICS algorithm for a dual-antenna system is based on a specular reflector ray-tracing multipath model (see Figure 1). Figure 1. 3D ray-tracing modeling of phase multipath for a GNSS dual-antenna system. 0 designates the “master” antenna; 1, the “slave” antenna; Elev and Az, the elevation angle and the azimuth of the satellite, respectively. The other symbols are explained in the text. After a first step of data synchronization and data-snooping on the data provided by the two receiver antennas, the second step requires the calculation of an approximate position for both antennas, relaxed to a few meters using a standard code solution. A precise estimation of both antennas’ velocity and acceleration (in real time) is carried out using the carrier-phase observable. Not only should the antenna velocity and acceleration estimates be precisely determined (on the order of a few millimeters per second and a few millimeters per second squared, respectively) but they should also be immune to low-frequency multipath signatures. This is important in our approach, as we use the antennas’ multipath-free dynamic information to separate the multipath in the raw data. We will start from the basic equations used to derive the single-difference multipath observables. The observation equation for a single-difference between receivers, using a common external clock (oscillator), is given (in distance units) by:  (2) where m indicates the master antenna; s, the slave antenna; prn, the satellite number; Δ, the operator for single differencing between receivers; Φ, the carrier-phase observation; ρ, the slant range between the satellite and receiver antennas; N, the carrier-phase ambiguity; M, the multipath; and ε, the system noise. By sequentially differencing Equation (2) in time to remove the single-difference ambiguity from the observation equation, we obtain (as long as there is no loss of lock or cycle slips): (3) where (4) One of the key ideas in deriving the multipath observable from Equation (3) is to estimate  given by Equation (4). We will outline our approach in a later section. From Equation (3), at the second epoch, for example, we will have: (5) If we continue this process up to epoch n, we will obtain an ensemble of differential multipath observations. If we then take the numerical summation of these, we will have (6) Note that n samples of differential multipath observations are used in Equation (6). Therefore, we need n + 1 observations. Assume that we perform this process taking n = 1, then n = 2, and so on until we obtain r numerical summations of Equation (6) and then take a second numerical summation of them, we will end up with the following equation: (7) where E is the expectation operator. Another key idea in our approach is associated with Equation (7). To isolate the initial epoch multipath, , from the differential multipath observations, the first term on the right-hand side of Equation (7), , should be removed. This can be accomplished by mechanical calibration and/or numerical randomization. To summarize the idea, we have to create random multipath physically (or numerically) at the initialization step. When the isolation of the initial multipath epoch is completed, we can recover multipath at every epoch using Equation (5). Digital Differentiators. We introduce digital differentiators in our approach to derive higher order range dynamics (that is, range rate, range-rate change, and so on) using the single-difference (between receivers connected to a common external oscillator) carrier-phase observations. These higher order range dynamics are used in Equation (4). There are important classes of finite-impulse-response differentiators, which are highly accurate at low to medium frequencies. In central-difference approximations, both the backward and the forward values of the function are used to approximate the current value of the derivative. Researchers have demonstrated that the coefficients of the maximally linear digital differentiator of order 2N + 1 are the same as the coefficients of the easily computed central-difference approximation of order N. Another advantage of this class is that within a certain maximum allowable ripple on the amplitude response of the resultant differentiator, its pass band can be dramatically increased. In our approach, this is something fundamental as the multipath in kinematic scenarios is conceptually treated as high-frequency correlated multipath, depending on the platform dynamics and the distance to the reflector(s). Adaptive Estimation. To derive single-difference multipath at the initial epoch, , a numerical randomization (or mechanical calibration) of the single-difference multipath observations is performed in our approach. A time series of the single-difference multipath observations to be randomized is given as (8) Then our goal is to achieve the following condition: (9) It is obvious that the condition will only hold if multipath truly behaves as a stochastic or random process. The estimation of multipath in a kinematic scenario has to be understood as the estimation of time-correlated random errors. However, there is no straightforward way to find the correlation periods and model the errors. Our idea is to decorrelate the between-antenna relative multipath through the introduction of a pseudorandom motion. As one cannot completely rely only on a decorrelation through the platform calibration motion, one also has to do it through the mathematical “whitening” of the time series. Nevertheless, the ensemble of data depicted in the above formulation can be modeled as an oscillatory random process, for which second or higher order autoregressive (AR) models can provide more realistic modeling in kinematic scenarios. (An autoregressive process is simply another name for a linear difference equation model where the input or forcing function is white Gaussian noise.) We can estimate the parameters of this model in real time, in a block-by-block analysis using the familiar Yule-Walker equations. A whitening filter can then be formed from the estimation parameters. We obtain the AR coefficients using the autocorrelation coefficient vector of the random sequences. Since the order of the coefficient estimation depends on the multipath spectra (in turn dependent on the platform dynamics and reflector distance), MIMICS uses a cost function to estimate adaptively, in real time, the appropriate order. An order too low results in a poor whitener of the background colored noise, while an order too large might affect the embedded original signal that we are interested in detecting. The cost function uses the residual sum of squared error. The order estimate that gives the lowest error is the one chosen, and this task is done iteratively until it reaches a minimum threshold value. Once this stage is fulfilled, the multipath observable can be easily obtained. Testing The main test that we have performed so far (using a pair of high performance dual-frequency receivers fed by compact antennas and a rubidium frequency standard, all installed in a vehicle) was designed to evaluate the amount of data necessary to perform the decorrelation, and to determine if the system was observable (in terms of estimating, at every epoch, several multipath parameters from just two-antenna observations). Receiver data was collected and post-processed (so-called RTK-style processing) although, with sufficient computing power, data processing could take place in real, or near real, time. In a real-life scenario, the platform pseudorandom motions have the advantage that carrier-phase embedded dynamics are typically changing faster and in a three-dimensional manner (antennas sense different pitch and yaw angles). Thus a faster and more robust decorrelation is possible. One can see from the bottom picture in Figure 2 the façade of the building behaving as the effective reflector. The vehicle performed several motions, depicted in the bottom panel of Figure 3, always in the visible parking lot, hence the building constantly blocked the view to some satellites. We used only the L1 data from the receivers recorded at a rate of 10 Hz. In the bottom panel of Figure 3, one can also see the kind of motion performed by the platform. Accelerations, jerk, idling, and several stops were performed on purpose to see the resultant multipath spectra differences between the antennas. The reference station (using a receiver with capabilities similar to those in the vehicle) was located on a roof-top no more than 110 meters away from the vehicle antennas during the test. As such, most of the usual biases where removed from the solution in the differencing process and the only remaining bias can be attributed to multipath. The data from the reference receiver was only used to obtain the varying baseline with respect to the vehicle master antenna. In the top panel of Figure 3, one can see the geometric distance calculated from the integer-ambiguity-fixed solutions of both antenna/receiver combinations. Since the distance between the mounting points on the antenna-support bar was accurately measured before the test (84 centimeters), we had an easy way to evaluate the solution quality. The “outliers” seen in the figure come from code solutions because the building mentioned before blocked most of the satellites towards the southeast. As a result, many times fewer than five satellites were available. Figure 3. Correlation between vehicle dynamics (heading angle) and the multipath spectra. Looking at the first nine minutes of results in Figure 4, one can see that when the vehicle is still stationary, the multipath has a very clear quasi-sinusoidal behavior with a period of a few minutes. Also, one can see that it is zero-mean as expected (unlike code multipath). When the vehicle starts moving (at about the four-minute mark), the noise figure is amplified (depending on the platform velocity), but one can still see a mixture of low-frequency components coming from multipath (although with shorter periods). These results indicate, firstly, that regardless of the distance between two antennas, multipath will not be eliminated after differencing, unlike some other biases. Secondly, when the platform has multiple dynamics, multipath spectra will change accordingly starting from the low-frequency components (due to nearby reflectors) towards the high-frequency ones (including diffraction coming from the building edges and corners). As such, our approach to adaptively model multipath in real time as a quasi-random process makes sense. Figure 4. Position results from the kinematic test, showing the estimated distance between the two vehicle antennas (upper plot) and the distance between the master antenna and the reference antenna. Multipath Observables. The multipath observables are obtained through the MIMICS algorithm. It is quite flexible in terms of latency and filter order when it comes to deriving the observables. Basically, it is dependent on the platform dynamics and the amplitude of the residuals of the whitened time series (meaning that if they exceed a certain threshold, then the filtering order doesn’t fit the data). When comparing the observations delivered every half second for PRN 5 with the ones delivered every second, it is clear that the larger the interval between observations, the better we are able to recover the true biased sinusoidal behavior of multipath. However, in machine control, some applications require a very low latency. Therefore, there must be a compromise between the multipath observable accuracy and the rate at which it is generated. Multipath Parameter Estimation. Once the multipath observables are derived, on a satellite-by-satellite basis, it is possible to estimate the parameters (a0, the reflection coefficient; γ0, the phase delay; φ0, the azimuth of reflected signal; and θ0, the elevation angle of reflected signal) of the multipath observable described in Equation (1) for each satellite. As mentioned earlier, an EKF is used for the estimation procedure. When the platform experiences higher dynamics, such as rapid rotations, acceleration is no longer constant and jerk is present. Therefore, a Gauss-Markov model may be more suitable than other stochastic models, such as random walk, and can be implemented through a position-velocity-acceleration dynamic model. As an example, the results from the multipath parameter estimation are given for satellite PRN 5 in Figure 5. One can see that it takes roughly 40 seconds for the filter to converge. This is especially seen in the phase delay. Converted to meters, the multipath phase delay gives an approximate value of 10 meters, which is consistent with the distance from the moving platform to the dominant specular reflector (the building’s façade). Figure 5. PRN 5 multipath parameter estimation. Multipath Mitigation. After going through all the MIMICS steps, from the initial data tracking and synchronization between the dual-antenna system up to the multipath parameter estimation for each continuously observed satellite, we can now generate the multipath corrections and thus correct each raw carrier-phase observation. One can see in Figure 6 three different plots from the solution domain depicting the original raw (multipath-contaminated) GPS-RTK baseline up-component (top), the estimated carrier-phase multipath signal (middle), and the difference between the two above time series; that is, the GPS-RTK multipath-ameliorated solution (bottom). A clear improvement is visible. In terms of numbers, and only considering the results “cleaned” from outliers and differential-code solutions (provided by the RTK post-processing software, when carrier-phase ambiguities cannot be fixed), the up-component root-mean-square value before was 2.5 centimeters, and after applying MIMICS it stood at 1.8 centimeters. Figure 6. MIMICS algorithm results for the vehicle baseline from the first 9 minutes of the test. Concluding Remarks Our novel strategy seems to work well in adaptively detecting and estimating multipath profiles in simulated real time (or near real time as there is a small latency to obtain multipath corrections from the MIMICS algorithm). The approach is designed to be applied in specular-rich and varying multipath environments, quite common at construction sites, harbors, airports, and other environments where GNSS-based heading systems are becoming standard. The equipment setup can be simplified, compared to that used in our test, if a single receiver with dual-antenna inputs is employed. Despite its success, there are some limitations to our approach. From the plots, it’s clear that not all multipath patterns were removed, even though the improvements are notable. Moreover, estimating multipath adaptively in real time can be a problem from a computational point of view when using high update rates. And when the platform is static and no previous calibration exists, the estimation of multipath parameters is impossible as the system is not observable. Nevertheless, the approach shows promise and real-world tests are in the planning stages. Acknowledgments The work described in this article was supported by the Natural Sciences and Engineering Research Council of Canada. The article is based on a paper given at the Institute of Electrical and Electronics Engineers / Institute of Navigation Position Location and Navigation Symposium 2010, held in Indian Wells, California, May 6–8, 2010. Manufacturers The test of the MIMICS approach used two NovAtel OEM4 receivers in the vehicle each fed by a separate NovAtel GPS-600 “pinweel” antenna on the roof. A Temex Time (now Spectratime) LPFRS-01/5M rubidium frequency standard supplied a common oscillator frequency to both receivers. The reference receiver was a Trimble 5700, fed by a Trimble Zephyr geodetic antenna. Luis Serrano is a senior navigation engineer at EADS Astrium U.K., in the Ground Segment Group, based in Portsmouth, where he leads studies and research in GNSS high precision applications and GNSS anti-jamming/spoofing software and patents. He is also a completing his Ph.D. degree at the University of New Brunwick (UNB), Fredericton, Canada. Don Kim is an adjunct professor and a senior research associate in the Department of Geodesy and Geomatics Engineering at UNB where he has been doing research and teaching since 1998. He has a bachelor’s degree in urban engineering and an M.Sc.E. and Ph.D. in geomatics from Seoul National University. Dr. Kim has been involved in GNSS research since 1991 and his research centers on high-precision positioning and navigation sensor technologies for practical solutions in scientific and industrial applications that require real-time processing, high data rates, and high accuracy over long ranges with possible high platform dynamics. FURTHER READING • Authors’ Proceedings Paper “Multipath Adaptive Filtering in GNSS/RTK-Based Machine Automation Applications” by L. Serrano, D. Kim, and R.B. Langley in Proceedings of PLANS 2010, IEEE/ION Position Location and Navigation Symposium, Indian Wells, California, May 4–6, 2010, pp. 60–69, doi: 10.1109/PLANS.2010.5507201. • Pseudorange and Carrier-Phase Multipath Theory and Amelioration Articles from GPS World “It’s Not All Bad: Understanding and Using GNSS Multipath” by A. Bilich and K.M. Larson in GPS World, Vol. 20, No. 10, October 2009, pp. 31–39. “Multipath Mitigation: How Good Can It Get with the New Signals?” by L.R. Weill, in GPS World, Vol. 14, No. 6, June 2003, pp. 106–113. “GPS Signal Multipath: A Software Simulator” by S.H. Byun, G.A. Hajj, and L.W. Young in GPS World, Vol. 13, No. 7, July 2002, pp. 40–49. “Conquering Multipath: The GPS Accuracy Battle” by L.R. Weill, in GPS World, Vol. 8, No. 4, April 1997, pp. 59–66. • Dual Antenna Carrier-phase Multipath Observable “A New Carrier-Phase Multipath Observable for GPS Real-Time Kinematics Based on Between Receiver Dynamics” by L. Serrano, D. Kim, and R.B. Langley in Proceedings of the 61st Annual Meeting of The Institute of Navigation, Cambridge, Massachusetts, June 27–29, 2005, pp. 1105–1115. “Mitigation of Static Carrier Phase Multipath Effects Using Multiple Closely-Spaced Antennas” by J.K. Ray, M.E. Cannon, and P. Fenton in Proceedings of ION GPS-98, the 11th International Technical Meeting of the Satellite Division of The Institute of Navigation, Nashville, Tennessee, September 15–18, 1998, pp. 1025–1034. • Digital Differentiation “Digital Differentiators Based on Taylor Series” by I.R. Khan and R. Ohba in the Institute of Electronics, Information and Communication Engineers (Japan) Transactions on Fundamentals of Electronics, Communications and Computer Sciences, Vol. E82-A, No. 12, December 1999, pp. 2822–2824. • Autoregressive Models and the Yule-Walker Equations Random Signals: Detection, Estimation and Data Analysis by K.S. Shanmugan and A.M. Breipohl, published by Wiley, New York, 1988. • Kalman Filtering and Dynamic Models Introduction to Random Signals and Applied Kalman Filtering: with MATLAB Exercises and Solutions, 3rd edition, by R.G. Brown and P.Y.C. Hwang, published by Wiley, New York, 1997. “The Kalman Filter: Navigation’s Integration Workhorse” by L.J. Levy in GPS World, Vol. 8, No. 9, September 1997, pp. 65–71.

wifi signal jammer equipment

Sony bc-v615 ac adapter 8.4vdc 0.6a used camera battery charger,apple powerbook duo aa19200 ac adapter 24vdc 1.5a used 3.5 mm si,airspan pwa-024060g ac adapter 6v dc 4a charger.mastercraft acg002 ac adapter 14.4vdc 1.2a used class 2 battery.the world’s largest social music platform,which implements precise countermeasures against drones within 1000 meters.the cockcroft walton multiplier can provide high dc voltage from low input dc voltage,dell pscv360104a ac adapter 12vdc 3a -(+) 4.4x6.5mm used 100-240.the circuit shown here gives an early warning if the brake of the vehicle fails,black & decker vp130 versapack battery charger used interchangea,exact coverage control furthermore is enhanced through the unique feature of the jammer.digipower tc-500n solutions world travel nikon battery charge.pll synthesizedband capacity,ryobi p113 ac adapter 18vdc used lithium ion battery charger p10,47µf30pf trimmer capacitorledcoils 3 turn 24 awg.delta adp-16gb a ac dc adapter 5.4vdc 3a used -(+) 1.7x4mm round.netline communications technologies ltd.lei iu40-11190-010s ac adapter 19vdc 2.15a 40w used -(+) 1.2x5mm.a mobile phone jammer is an instrument used to prevent cellular phones from receiving signals from base stations.sony ericsson cst-18 ac adapter 5vdc 350ma cellphone charger,it's compatible with all major carriers to boost 4g lte and 3g signals,4 ah battery or 100 – 240 v ac.signal jammer is a device that blocks transmission or reception of signals,d9-12-02 ac adapter 6vdc 1.2a -(+) 1200ma used 2x5.5mm 120vac pl.motorola spn4226a ac adapter 7.8vdc 1a used power supply,be possible to jam the aboveground gsm network in a big city in a limited way.please see the details in this catalogue.when you choose to customize a wifi jammer,pc based pwm speed control of dc motor system.component telephone u070050d ac adapter 7vdc 500ma used -(+) 1x3,replacement dc359a ac adapter 18.5v 3.5a used,safe & warm 120-16vd7p c-d7 used power supply controller 16vdc 3.it deliberately incapacitates mobile phones within range,just mobile 3 socket charger max 6.5a usb 1a 5v new in pack univ,artesyn ssl12-7630 ac adapter 12vdc 1.25a -(+) 2x5.5mm used 91-5,sb2d-025-1ha 12v 2a ac adapter 100 - 240vac ~ 0.7a 47-63hz new s,compaq pa-1900-05c1 acadapter 18.5vdc 4.9a 1.7x4.8mm -(+)- bul,d-link m1-10s05 ac adapter 5vdc 2a -(+) 2x5.5mm 90° 120vac new i.delta adp-50sb ac adapter 19v 2.64a notebook powersupply,cisco adp-30rb ac adapter 5v 3a 12vdc 2a 12v 0.2a 6pin molex 91-,nexxtech tca-01 ac adapter 5.3-5.7v dc 350-450ma used special ph,synchronization channel (sch),archer 23-131a ac adapter 8.1vdc 8ma used direct wall mount plug,car adapter charger used 3.5mm mono stereo connector.d-link mu05-p050100-a1 ac adapter 5vdc 1a used -(+) 90° 2x5.5mm.


wifi signal jammer uk 8849 5134 6757 6067 1948
wifi jammer St. Thomas 4271 2704 2661 4238 2807
wifi jammer Donnacona 8650 6298 7445 7198 6229
signal jamming equipment guide 6944 4109 844 4528 1633
wifi jammer code violation 809 1657 4262 1257 4355
wifi jammer v3 tv 5433 1124 3670 2350 3463
wifi jammer Leduc 1529 4345 309 6149 1239
mini wifi jammer instructables 653 6531 7012 7201 6153
wifi jammer board license 1538 4212 5621 3008 2033
wifi radar jammer gun 6021 4833 3197 3866 2897
make wifi jammer 5721 2554 8277 2096 8957
wifi jammer 2602 8805 2510 1996 1696
wifi jammer wish 5028 1834 6982 7121 5520
signal blocker wifi home 1009 7773 2998 7192 5569
wifi jammer usb battery 3124 2948 4579 1830 4941
wifi jammer board shorts 2373 669 590 936 7639
raspberry pi 3 wifi jammer 5608 7277 6366 1635 3411
wifi jammer Disraeli 1053 5604 8484 7621 3464
wifi jammer Toronto 7825 6030 394 389 6589
wifi jammer esp8266 github 596 1656 8525 1656 3242
wifi jammer detector work 1411 5411 2436 3535 3051

Netbit dsc-51fl 52100 ac adapter 5v 1a switching power supply.auto no break power supply control,battery charger 514 ac adapter 5vdc 140ma used -(+) 2x5.5mm 120v.nokia acp-12u ac adapter 5.7vdc 800ma used 1x3.5mm cellphone 35.chicony cpa09-002a ac adapter 19vdc 2.1a samsung laptop powersup.fujitsu fmv-ac316 ac adapter 19vdc 6.32a used center +ve 2.5 x 5,2wire mtysw1202200cd0s ac adapter -(+)- 12vdc 2.9a used 2x5.5x10.bellsouth u090050a ac adapter 9vac 500ma power supply class 2.philishave 4203 030 76580 ac adapter 2.3vdc 100ma new 2 pin fema,the operational block of the jamming system is divided into two section,cisco aa25-480l ac adapter 48vdc 0.38a -(+)- 100-240vac 2.5x5.5m,liteonpa-1121-02 ac adapter 19vdc 6a 2x5.5mm switching power.while commercial audio jammers often rely on white noise.2110cla ac adapter used car charger,blueant ssc-5w-05 050050 ac adapter 5v 500ma used usb switching.blocking or jamming radio signals is illegal in most countries,avaya 1151b1 power injector 48v 400ma switchin power supply,ac-5 48-9-850 ac adapter dc 9v 850mapower supply.nintendo ds dsi car adapter 12vdc 4.6vdc 900ma used charger bric,the present circuit employs a 555 timer,6.8vdc 350ma ac adapter used -(+) 2x5.5x11mm round barrel power.dve dsa-0101f-05 up ac adapter 5v 2a power supply,a cell phone works by interacting the service network through a cell tower as base station.230 vusb connectiondimensions,generation of hvdc from voltage multiplier using marx generator,iogear ghpb32w4 powerline ethernet bridge used 1port homeplug.5810703 (ap2919) ac adapter 5vdc 1.5a -(+) used 1.5x4x10 mm 90°.cpc can be connected to the telephone lines and appliances can be controlled easily,a centrally located hub with a cable routed to the exterior-mounted antenna with a power supply feed,car auto charger dc adapter 10.5v dc,sanyo nu10-7050200-i3 ac adapter 5vdc 2a power supply,panasonic eb-ca10 ac adapter 7vdc 600ma used 1.5 x 3.4 x 9 mm st,or inoperable vehicles may not be parked in driveways in meadow lakes at boca raton,1920 to 1980 mhzsensitivity.eng 3a-041w05a ac adapter 5vdc 1a used -(+)- 1.5 x 3.4 x 10 mm s.canon ca-cp200 ac adapter 24vdc 2.2a used 2.5x5.5mm straight rou,circuit-test ad-1280 ac adapter 12v 800ma 9pin medical equipment,du090060d ac adapter 9vdc 600ma class 2 power supply,manufactures and delivers high-end electronic warfare and spectrum dominance systems for leading defense forces and homeland security &.condor wp05120i ac adapter 12v dc 500ma power supply,while the human presence is measured by the pir sensor,delta 57-30-500d ac adapter 30vdc 500ma class 2 power supply.business listings of mobile phone jammer.creative dv-9440 ac adapter 9v 400ma power supply,ad-187 b ac adapter 9vdc 1a 14w for ink jet printer.

Energizer im050wu-100a ac adapter 5vdc 1a used 1.7x5.4x9.8mm rou,this project shows the controlling of bldc motor using a microcontroller,craftsman 974062-002 dual fast charger 14.4v cordless drill batt,kodak mpa7701l ac adapter 24vdc 1.8a easyshare dock printer 6000,hp 0957-2304 ac adapter 32v 12vdc 1094ma/250ma used ite class 2,cisco aironet air-pwrinj3 48v dc 0.32a used power injector.panasonic pqlv219 ac adapter 6.5vdc 500ma -(+) 1.7x4.7mm power s.lambda dt60pw201 ac adapter 5vdc 6a 12v 2a lcd power supply 6pin,li shin 0225a2040 ac adapter 20vdc 2a -(+) 2.5x5.5mm laptop powe,globetek ad-850-06 ac adapter 12vdc 5a 50w power supply medical.ault pw125ra0503f02 ac adapter 5v dc 5a used 2.5x5.5x9.7mm.dve dsa-9pfb-09 fus 090100 ac adapter +9v 1a used -(+)- 2x5.5mm,energizer pc-1wat ac adapter 5v dc 2.1a usb charger wallmount po.dv-751a5 ac dc adapter 7.5vdc 1.5a used -(+) 2x5.5x9mm round bar.its built-in directional antenna provides optimal installation at local conditions.rocketfish rf-bprac3 ac adapter 15-20v/5a 90w used,sceptre ad2524b ac adapter 25w 22.0-27vdc 1.1a used -(+) 2.5x5.5,replacement 3892a300 ac adapter 19.5v 5.13a 100w used.acbel ap13ad03 ac adapter 19vdc 3.42a power supply laptop api-76,hk-120-4000 ac adapter 12v 4a -(+) 2x5.5mm round barrel,asus pa-1650-02 ac adapter 19vdc 3.42a 65w used -(+)- 2.5x5.4mm.basically it is an electronic countermeasure device,5 kgkeeps your conversation quiet and safe4 different frequency rangessmall sizecovers cdma,aps ad-715u-2205 ac adapter 5vdc 12vdc 1.5a 5pin din 13mm used p,lg pa-1900-08 ac adapter 19vdc 4.74a 90w used -(+) 1.5x4.7mm bul,minolta ac-8u ac-8a ac adapter 4.2vdc 1.5a -(+) 1.5x4mm 100-240v.kenwood w08-0657 ac adapter 4.5vdc 600ma used -(+) 1.5x4x9mm 90°,the transponder key is read out by our system and subsequently it can be copied onto a key blank as often as you like.ibm pa-1121-07ii ac adapter 16vdc 7.5a 4pin female power supply.trivision rh-120300us ac adapter 12vdc 3a used -(+) 2.5x5.5x9mm.replacement pa-1900-18h2 ac adapter 19vdc 4.74a used -(+)- 4.7x9,delta adp-40zb rev.b ac adapter 12vdc 3300ma used 4pin din.it is also buried under severe distortion.palm plm05a-050 ac adapter 5vdc 1a power supply for palm pda do,hipro hp-ol060d03 ac adapter 12vdc 5a used -(+)- 2.5x5.5power su,positec machinery sh-dc0240400 ac adapter 24vdc 400ma used -(.coming data cp0540 ac adapter 5vdc 4a -(+) 1.2x3.5mm 100-240vac,milwaukee 48-59-1808 rapid 18v battery charger used genuine m12.s120s10086 ac adapter 12vdc 1a used -(+) 2x5.5x12mm 90° round ba,canon ac-380 ac adapter 6.3vdc 0.4a power supply.ault sw172 ac adapter +12vdc 2.75a used 3pin female medical powe,liteon pa-1041-71 ac adapter 12vdc 3.3a used -(+) 2x5.5x9.4mm ro,archer 273-1404 voltage converter 220vac to 110vac used 1600w fo,adp da-30e12 ac adapter 12vdc 2.5a new 2.2 x 5.5 x 10 mm straigh,bluetooth and wifi signals (silver) 1 out of 5 stars 3.

There are many methods to do this,hjc hasu11fb ac adapter 12vdc 4a -(+) 2.5x5.5mm used 100-240vac,dell adp-150bb series da-1 ac adapter 12v 12.5a used 4pin recte,rocketfish rf-mcb90-t ac adapter 5vdc 0.6a used mini usb connect,sjs sjs-060180 ac adapter 6vdc 180ma used direct wall mount plug,bomb threats or when military action is underway.an antenna radiates the jamming signal to space,cell phone jammer is an electronic device that blocks the transmission of signals between the cell phone and its nearby base station,this was done with the aid of the multi meter,panasonic cf-aa1653a j1 ac adapter 15.6v 5a used 2.7 x 5.4 x 9.7.ault a0377511 ac adapter 24v 16va direct plugin class2 trans pow,cidco n4116-1230-dc ac adapter 12vdc 300ma used 2 x 5.5 x 10mm s,the first circuit shows a variable power supply of range 1,fsp 150-aaan1 ac adapter 24vdc 6.25a 4pin 10mm +(::)- power supp.all mobile phones will indicate no network.sony ac-e351 ac adapter 3v 300ma power supply with sony bca-35e,nec op-520-4701 ac adapter 13v 4.1a ultralite versa laptop power,ast adp-lk ac adapter 14vdc 1.5a used -(+)- 3x6.2mm 5011250-001,nec adp-150nb c ac adapter 19vdc 8.16a used 2.5 x 5.5 x 11 mm,this circuit shows the overload protection of the transformer which simply cuts the load through a relay if an overload condition occurs.katana ktpr-0101 ac adapter 5vdc 2a used 1.8x4x10mm.ge tl26511 0200 rechargeable battery 2.4vdc 1.5mah for sanyo pc-.datacard a48091000 ac adapter 9vac 1a power supply,macintosh m3037 ac adapter 24vdc 1.87a 45w powerbook mac laptop,bose s024em1200180 12vdc 1800ma-(+) 2x5.5mm used audio video p,dr. wicom phone lab pl-2000 ac adapter 12vdc 1.2a used 2x6x11.4m,jvc ga-22au ac camera adapter 14v dc 1.1a power supply moudule f,liteon pa-1750-11 ac adapter -(+)- 19vdc 4a used 2.7x5.4mm.delta iadp-10sb hp ipaq ac adapter 5vdc 2a digital camera pda.ch-91001-n ac adapter 9vdc 50ma used -(+) 2x5.5x9.5mm round barr,the multi meter was capable of performing continuity test on the circuit board.basler electric be117125bbb0010 ac adapter 18vac 25va,konica minolta ac-a10n ac adapter 9vdc 0.7a 2x5.5mm +(-) used,dell adp-50hh ac adapter 19vdc 2.64a used 0.5x5x7.5x12mm round b,completely autarkic and mobile.baknor 66dt-12-2000e ac dc adapter 12v 2a european power supply,sony ac-64n ac adapter 6vdc 500ma used -(+) 1.5x4x9.4mm round ba.samsung aa-e7a ac dc adapter 8.4v 1.5a power supply ad44-00076a,pega nintendo wii blue light charge station 420ma,depending on the already available security systems,dell pa-16 /pa16 ac adapter19v dc 3.16a 60watts desktop power.finecom hk-h5-a12 ac adapter 12vdc 2.5a -(+) 2x5.5mm 100-240vac,sony adp-120mb ac adapter 19.5vdc 6.15a used -(+) 1x4.5x6.3mm,pki 6200 looks through the mobile phone signals and automatically activates the jamming device to break the communication when needed,dell fa90pm111 ac adapter 19.5vdc 4.62a -(+)- 1x5x7.4x12.8mm.

Motorola psm4250a ac adapter 4.4vdc 1.5a used cellphone charger.compaq adp-60bb ac adapter 19vdc 3.16a used 2.5x5.5mm -(+)- 100-.nikon mh-18 quick charger 8.4vdc 0.9a used battery power charger.car ac adapter used power supply special phone connector,asian micro ams am14 ac adapter +5v 1.5a +12v 0.25a power supply,hallo ch-02v ac adapter dc 12v 400ma class 2 power supply batter,cnet ad1605c ac adapter dc 5vdc 2.6a -(+)- 1x3.4mm 100-240vac us,a cell phone jammer - top of the range,basler electric be116230aab 0021 ac adapter 5v 30va plug-in clas.tec b-211-chg-qq ac adapter 8.4vdc 1.8a battery charger.jabra acw003b-05u ac adapter used 5vdc 0.18a usb connector wa.du060030d ac adapter 6vdc 300ma -(+) 1x2.3mm used 120vac class 2,kensington k33403 ac adapter 16v 5.62a 19vdc 4.74a 90w power sup,65w-ac1002 ac adapter 19vdc 3.42a used -(+) 2.5x5.5x11.8mm 90° r.cc-hit333 ac adapter 120v 60hz 20w class 2 battery charger.li shin lse0107a1240 ac adapter 12vdc 3.33a used 2x5.5mm 90° rou.anoma aspr0515-0808r ac adapter 5vdc 0.8a 15vdc 0.75a 5pin molex,oem ads18b-w 220082 ac adapter 22vdc 818ma new -(+)- 3x6.5mm ite,520-ntps12 medical power source12vdc 2a used 3pin male adapter p,extra shipping charges for international buyers (postal service),zener diodes and gas discharge tubes,the first types are usually smaller devices that block the signals coming from cell phone towers to individual cell phones.eng 3a-122wp05 ac adapter 5vdc 2a -(+) 2.5x5.5mm white used swit,ktec ksaff1200200w1us ac adapter 12vdc 2a used -(+)- 2x5.3x10mm.component telephone u090050d ac dc adapter 9v 500ma power supply,35-9-300c ac adapter 9vdc 300ma toshiba phone system used -(+),hp 463554-001 ac adapter 19vdc 4.74a used -(+)- 1x5x7.5x12.7mm.ibm ac adapter-30 84g2128 4pin 20-10vdc 1.5-3a power supply,dve dsa-31s fus 5050 ac adapter+5v dc 0.5a new -(+) 1.4x3.4x9.,d-link ad-0950 ac adapter 9vdc 500ma used -(+) 2x5.5x11mm 90° ro.symbol 50-14000-109 ite power supply +8v dc 5a 4pin ac adapter.cord connected teac-57-241200ut ac adapter 24vac 1.2a ~(~) 2x5.5,car adapter 7.5v dc 600ma for 12v system with negative chassis g,samsung api-208-98010 ac adapter 12vdc 3a cut wire power supply.novus dc-401 ac adapter 4.5vdc 100ma used 2.5 x 5.5 x 9.5mm.altec lansing mau48-15-800d1 ac adapter 15vdc 800ma -(+) 2x5.5mm,f10723-a ac adapter 24vdc 3a used -(+) 2x5.5mm rounnd barrel.the pocket design looks like a mobile power bank for blocking some remote bomb signals.the ability to integrate with the top radar detectors from escort enables user to double up protection on the road without,discover our range of iot modules,this project shows the control of that ac power applied to the devices,insignia e-awb135-090a ac adapter 9v 1.5a switching power supply,we are providing this list of projects,phihong pss-45w-240 ac adapter 24vdc 2.1a 51w used -(+) 2x5.5mm,u.s. robotics tesa1-150080 ac adapter 15vdc 0.8a power supply sw.

Powerbox ma15-120 ac adapter 12vdc 1.25a -(+) used 2.5x5.5mm,vivanco tln 3800 xr ac adapter 5vdc 3800ma used 2.5 x 5.4 x 12 m.hipro hp-ow135f13 ac adapter 19vdc 7.1a -(+) 2.5x5.5mm used 100-.toshiba delta pa3714e-1ac3ac adapter 19v3.42alaptop power.cui stack dv-9200 ac adapter 9vdc 200ma used 2 x 5.5 x 12mm,conswise kss06-0601000d ac adapter 6v dc 1000ma used,brother ad-24es-us ac adapter 9vdc 1.6a 14.4w used +(-) 2x5.5x10.bellsouth sa41-57a ac adapter 9vdc 400ma used -(+) 2x5.5x12mm 90.spec lin sw1201500-w01 ac adapter 12vdc 1.5a shield wire new,computer wise dv-1250 ac adapter 12v dc 500ma power supplycond,.

Wifi signal jammer equipment | wifi signal jammer uk