An Introduction to Bandwidth, Gain Pattern, Polarization and All That How do you find best antenna for particular GNSS application, taking into account size, cost, and capability? We look at the basics of GNSS antennas, introducing the various properties and trade-offs that affect functionality and performance. Armed with this information, you should be better able to interpret antenna specifications and to select the right antenna for your next job. By Gerald J. K. Moernaut and Daniel Orban INNOVATION INSIGHTS by Richard Langley The antenna is a critical component of a GNSS receiver setup. An antenna’s job is to capture some of the power in the electromagnetic waves it receives and to convert it into an electrical current that can be processed by the receiver. With very strong signals at lower frequencies, almost any kind of antenna will do. Those of us of a certain age will remember using a coat hanger as an emergency replacement for a broken AM-car-radio antenna. Or using a random length of wire to receive shortwave radio broadcasts over a wide range of frequencies. Yes, the higher and longer the wire was the better, but the length and even the orientation weren’t usually critical for getting a decent signal. Not so at higher frequencies, and not so for weak signals. In general, an antenna must be designed for the particular signals to be intercepted, with the center frequency, bandwidth, and polarization of the signals being important parameters in the design. This is no truer than in the design of an antenna for a GNSS receiver. The signals received from GNSS satellites are notoriously weak. And they can arrive from virtually any direction with signals from different satellites arriving simultaneously. So we don’t have the luxury of using a high-gain dish antenna to collect the weak signals as we do with direct-to-home satellite TV. Of course, we get away with weak GNSS signals (most of the time) by replacing antenna gain with receiver-processing gain, thanks to our knowledge of the pseudorandom noise spreading codes used to transmit the signals. Nevertheless, a well-designed antenna is still important for reliable GNSS signal reception (as is a low-noise receiver front end). And as the required receiver position fix accuracy approaches centimeter and even sub-centimeter levels, the demands on the antenna increase, with multipath suppression and phase-center stability becoming important characteristics. So, how do you find the best antenna for a particular GNSS application, taking into account size, cost, and capability? In this month’s column, we look at the basics of GNSS antennas, introducing the various properties and trade-offs that affect functionality and performance. Armed with this information, you should be better able to interpret antenna specifications and to select the right antenna for your next job. “Innovation” is a regular column that features discussions about recent advances in GPS technology and its applications as well as the fundamentals of GPS positioning. The column is coordinated by Richard Langley of the Department of Geodesy and Geomatics Engineering at the University of New Brunswick, who welcomes your comments and topic ideas. To contact him, see the “Contributing Editors” section. The antenna is often given secondary consideration when installing or operating a Global Navigation Satellite Systems (GNSS) receiver. Yet the antenna is crucial to the proper operation of the receiver. This article gives the reader a basic understanding of how a GNSS antenna works and what performance to look for when selecting or specifying a GNSS antenna. We explain the properties of GNSS antennas in general, and while this discussion is valid for almost any antenna, we focus on the specific requirements for GNSS antennas. And we briefly compare three general types of antennas used in GNSS applications. When we talk about GNSS antennas, we are typically talking about GPS antennas as GPS has been the navigation system for years, but other systems have been and are being developed. Some of the frequencies used by these other systems are unique, such as Galileo’s E6 band and the GLONASS L1 band, and may not be covered by all antennas. But other than frequency coverage, all GNSS antennas share the same properties. GNSS Antenna Properties A number of important properties of GNSS antennas affect functionality and performance, including: Frequency coverage Gain pattern Circular polarization Multipath suppression Phase center Impact on receiver sensitivity Interference handling We will briefly discuss each of these properties in turn. Frequency Coverage. GNSS receivers brought to market today may include frequency bands such as GPS L5, Galileo E5/E6, and the GLONASS bands in addition to the legacy GPS bands, and the antenna feeding a receiver may need to cover some or all of these bands. TABLE 1 presents an overview of the frequencies used by the various GNSS constellations. Keep in mind that you may see slightly different numbers published elsewhere depending on how the signal bandwidths are defined. TABLE 1. GNSS Frequency Allocations. (Data: Gerald J. K. Moernaut and Daniel Orban) As the bandwidth requirement of an antenna increases, the antenna becomes harder to design, and developing an antenna that covers all of these bands and making it compliant with all of the other requirements is a challenge. If small size is also a requirement, some level of compromise will be needed. Gain Pattern. For a transmitting antenna, gain is the ratio of the radiation intensity in a given direction to the radiation that would be obtained if the power accepted by the antenna was radiated isotropically. For a receiving antenna, it is the ratio of the power delivered by the antenna in response to a signal arriving from a given direction compared to that delivered by a hypothetical isotropic reference antenna. The spatial variation of an antenna’s gain is referred to as the radiation pattern or the receiving pattern. Actually, under the antenna reciprocity theorem, these patterns are identical for a given antenna and, ignoring losses, can simply be referred to as the gain pattern. The receiver operates best with only a small difference in power between the signals from the various satellites being tracked and ideally the antenna covers the entire hemisphere above it with no variation in gain. This has to do with potential cross-correlation problems in the receiver and the simple fact that excessive gain roll-off may cause signals from satellites at low elevation angles to drop below the noise floor of the receiver. On the other hand, optimization for multipath rejection and antenna noise temperature (see below) require some gain roll-off. FIGURE 1. Theoretical antenna with hemispherical gain pattern. Boresight corresponds to θ = 0°. (Data: Gerald J. K. Moernaut and Daniel Orban) FIGURE 1 shows what a perfect hemispherical gain pattern looks like, with a cut through an arbitrary azimuth. However, such an antenna cannot be built and “real-world” GNSS antennas see a gain roll-off of 10 to 20 dB from boresight (looking straight up from the antenna) to the horizon. FIGURE 2 shows what a typical gain pattern looks like as a cross-section through an arbitrary azimuth. FIGURE 2. “Real-world” antenna gain pattern. (Data: Gerald J. K. Moernaut and Daniel Orban) Circular Polarization. Spaceborne systems at L-Band typically use circular polarization (CP) signals for transmitting and receiving. The changing relative orientation of the transmitting and receiving CP antennas as the satellites orbit the Earth does not cause polarization fading as it does with linearly polarized signals and antennas. Furthermore, circular polarization does not suffer from the effects of Faraday rotation caused by the ionosphere. Faraday rotation results in an electromagnetic wave from space arriving at the Earth’s surface with a different polarization angle than it would have if the ionosphere was absent. This leads to signal fading and potentially poor reception of linearly polarized signals. Circularly polarized signals may either be right-handed or left-handed. GNSS satellites use right-hand circular polarization (RHCP) and therefore a GNSS antenna receiving the direct signals must also be designed for RHCP. Antennas are not perfect and an RHCP antenna will pick up some left-hand circular polarization (LHCP) energy. Because GPS and other GNSS use RHCP, we refer to the LHCP part as the cross-polar component (see FIGURE 3). FIGURE 3. Co- and cross-polar gain pattern versus boresight angle of a rover antenna. (Data: Gerald J. K. Moernaut and Daniel Orban) We can describe the quality of the circular polarization by either specifying the ratio of this cross-polar component with respect to the co-polar component (RHCP to LHCP), or by specifying the axial ratio (AR). AR is the measure of the polarization ellipticity of an antenna designed to receive circularly polarized signals. An AR close to 1 (or 0 dB) is best (indicating a good circular polarization) and the relationship between the co-/cross-polar ratio and axial ratio is shown in FIGURE 4. FIGURE 4. Converting axial ratio to co-/cross-polar ratio. (Data: Gerald J. K. Moernaut and Daniel Orban) FIGURE 5. Co-/cross-polar and axial ratios versus boresight angle of a rover-style antenna. (Data: Gerald J. K. Moernaut and Daniel Orban) FIGURE 5 shows the ratio of the co- and cross-polar components and the axial ratio versus boresight (or depression) angle for a typical GPS antenna. The boresight angle is the complement of the elevation angle. For high-end GNSS antennas such as choke-ring and other geodetic-quality antennas, the typical AR along the boresight should be not greater than about 1 dB. AR increases towards lower elevation angles and you should look for an AR of less than 3 to 6 dB at a 10° elevation angle for a high-performance antenna. Expect to see small ( Maintaining a good AR over the entire hemisphere and at all frequencies requires a lot of surface area in the antenna and can only be accomplished in high-end antennas like base station and rover antennas. Multipath Suppression. Signals coming from the satellites arrive at the GNSS receiver’s antenna directly from space, but they may also be reflected off the ground, buildings, or other obstacles and arrive at the antenna multiple times and delayed in time. This is termed multipath. It degrades positioning accuracy and should be avoided. High-end receivers are able to suppress multipath to a certain extent, but it is good engineering practice to suppress multipath in the antenna as much as possible. A multipath signal can come from three basic directions: The ground and arrive at the back of the antenna. The ground or an object and arrive at the antenna at a low elevation angle. An object and arrive at the antenna at a high elevation angle. Reflected signals typically contain a large LHCP component. The technique to mitigate each of these is different and, as an example, we will describe suppression of multipath signals due to ground and vertical object reflections. Multipath susceptibility of an antenna can be quantified with respect to the antenna’s gain pattern characteristics by the multipath ratio (MPR). FIGURE 6 sketches the multipath problem due to ground reflections. FIGURE 6. Quantifying multipath caused by ground reflections. (Data: Gerald J. K. Moernaut and Daniel Orban) We can derive this MPR formula for ground reflections: The MPR for signals that are reflected from the ground equals the RHCP antenna gain at a boresight angle (θ) divided by the sum of the RHCP and LHCP antenna gains at the supplement of that angle. Signals that are reflected from the ground require the antenna to have a good front-to-back ratio if we want to suppress them because an RHCP antenna has by nature an LHCP response in the anti-boresight or backside hemisphere. The front-to-back ratio is nominally the difference in the boresight gain and the gain in the anti-boresight direction. A good front-to-back ratio also minimizes ground-noise pick-up. Similarly, an MPR formula can be written for signals that reflect against vertical objects. FIGURE 7 sketches this. FIGURE 7. Quantifying multipath caused by vertical object reflections. (Data: Gerald J. K. Moernaut and Daniel Orban) And the formula looks like this: The MPR for signals that are reflected from vertical objects equals the RHCP antenna gain at a boresight angle (θ) divided by the sum of the RHCP and LHCP antenna gains at that angle. Multipath signals from reflections against vertical objects such as buildings can be suppressed by having a good AR at those elevation angles from which most vertical object multipath signals arrive. This AR requirement is readily visible in the MPR formula considering these reflections are predominantly LHCP, and in this case MPR simply equals the co- to cross-polar ratio. LHCP reflections that arrive at the antenna at high elevation angles are not a problem because the AR tends to be quite good at these elevation angles and the reflection will be suppressed. LHCP signals arriving at lower elevation angles may pose a problem because the AR of an antenna at low elevation angles is degraded in “real-world” antennas. It makes sense to have some level of gain roll-off towards the lower elevation angles to help suppress multipath signals. However, a good AR is always a must because gain roll-off alone will not do not it. Phase Center. A position fix in GNSS navigation is relative to the electrical phase center of the antenna. The phase center is the point in space where all the rays appear to emanate from (or converge on) the antenna. Put another way, it is the point where the electromagnetic fields from all incident rays appear to add up in phase. Determining the phase center is important in GNSS applications, particularly when millimeter-positioning resolution is desired. Ideally, this phase center is a single point in space for all directions at all frequencies. However, a “real-world” antenna will often possess multiple phase center points (for each lobe in the gain pattern, for example) or a phase center that appears “smeared out” as frequency and viewing angle are varied. The phase-center offset can be represented in three dimensions where the offset is specified for every direction at each frequency band. Alternatively, we can simplify things and average the phase center over all azimuth angles for a given elevation angle and define it over the 10° to 90° elevation-angle range. For most applications even this simplified representation is over-kill, and typically only a vertical and a horizontal phase-center offset are specified for all bands in relation to L1. For well-designed high-end GNSS antennas, phase center variations in azimuth are small and on the order of a couple of millimeters. The vertical phase offsets are typically 10 millimeters or less. Many high-end antennas have been calibrated, and tables of phase-center offsets for these antennas are available. Impact on Receiver Sensitivity. The strength of the signals from space is on the order of -130 dBm. We need a really sensitive receiver if we want to be able to pick these up. For the antenna, this translates into the need for a high-performance low noise amplifier (LNA) between the antenna element itself and the receiver. We can characterize the performance of a particular receiver element by its noise figure (NF), which is the ratio of actual output noise of the element to that which would remain if the element itself did not introduce noise. The total (cascaded) noise figure of a receiver system (a chain of elements or stages) can be calculated using the Friss formula as follows: The total system NF equals the sum of the NF of the first stage (NF1) plus that of the second stage (NF2) minus 1 divided by the total gain of the previous stage (G1) and so on. So the total NF of the whole system pretty much equals that of the first stage plus any losses ahead of it such as those due to filters. Expect to see total LNA noise figures in the 3-dB range for high performance GNSS antennas. The other requirement for the LNA is for it to have sufficient gain to minimize the impact of long and lossy coaxial antenna cables — typically 30 dB should be enough. Keep in mind that it is important to have the right amount of gain for a particular installation. Too much gain may overload the receiver and drive it into non-linear behavior (compression), degrading its performance. Too little, and low-elevation-angle observations will be missed. Receiver manufacturers typically specify the required LNA gain for a given cable run. Interference Handling. Even though GNSS receivers are good at mitigating some kinds of interference, it is essential to keep unwanted signals out of the receiver as much as possible. Careful design of the antenna can help here, especially by introducing some frequency selectivity against out-of-band interferers. The mechanisms by which in-band an out-of-band interference can create trouble in the LNA and the receiver and the approach to dealing with them are somewhat different. FIGURE 8. Strong out-of-band interferer and third harmonic in the GPS L1 band. (Data: Gerald J. K. Moernaut and Daniel Orban) An out-of-band interferer is generally an RF source outside the GNSS frequency bands: cellular base stations, cell phones, broadcast transmitters, radar, etc. When these signals enter the LNA, they can drive the amplifier into its non-linear range and the LNA starts to operate as a multiplier or comb generator. This is shown in FIGURE 8 where a -30-dBm-strong interferer at 525 MHz generates a -78 dBm spurious signal or spur in the GPS L1 band. Through a similar mechanism, third-order mixing products can be generated whereby a signal is multiplied by two and mixes with another signal. As an example, take an airport where radars are operating at 1275 and 1305 MHz. Both signals double to 2550 and 2610 MHz. These will in turn mix with the fundamentals and generate 1245 and 1335 MHz signals. Another mechanism is de-sensing: as the interference is amplified further down in the LNA’s stages, its amplitude increases, and at some point the GNSS signals get attenuated because the LNA goes into compression. The same thing may happen down the receiver chain. This effectively reduces the receiver’s sensitivity and, in some cases, reception will be lost completely. RF filters can reduce out-of-band signals by 10s of decibels and this is sufficient in most cases. Of course, filters add insertion loss and amplitude and phase ripple, all of which we don’t want because these degrade receiver performance. In-band interferers can be the third-order mixing products we mentioned above or simply an RF source that transmits inside the GNSS bands. If these interferers are relatively weak, the receiver will handle them, but from a certain power level on, there is just not a lot we can do in a conventional commercial receiver. The LNA should be designed for a high intercept point (IP)–at which non-linear behavior begins–so compression does not occur with strong signals present at its input. On the other hand, there is no requirement for the LNA to be a power amplifier. As an example, let’s say we have a single strong continuous wave interferer in the L1 band that generates -50 dBm at the input of the LNA. A 50 dB, high IP LNA will generate a 0 dBm carrier in the L1 band but the receiver will saturate. LNAs with a higher IP tend to consume more power and in a portable application with a rover antenna — that may be an issue. In a base-station antenna, on the other hand, low current consumption should not be a requirement since a higher IP is probably more valuable than low power consumption. GNSS Antenna Types Here is a short comparison of three types of GNSS antennas: geodetic, rover, and handheld. For detailed specifications of examples of each of these types, see the references in Further Reading. Geodetic Antennas. High precision, fixed-site GNSS applications require geodetic-class receivers and antennas. These provide the user with the highest possible position accuracy. As a minimum, typical geodetic antennas cover the GPS L1 and L2 bands. Some also cover the GLONASS frequencies. Coverage of L5 is found in some newer designs as well as coverage of the Galileo frequencies and the L-band frequencies of differential GNSS services. The use of choke-ring ground planes is typical in geodetic antennas. These allow good gain pattern control, excellent multipath suppression, high front-to-back ratio, and good AR at low elevation angles. Choke rings contribute to a stable phase center. The phase center is documented (as mentioned earlier), and high-end receivers allow the antenna behavior to be taken into account. Combined with a state-of-the-art LNA, these antennas provide the highest possible performance. Rover Antennas. Rover antennas are typically used in land survey, forestry, construction, and other portable or mobile applications. They provide the user with good accuracy while being optimized for portability. Horizontal phase-center variation versus azimuth should be low because the orientation of the antenna with respect to magnetic north, say, is usually unknown and cannot be corrected for in the receiver. A rover antenna is typically mounted on a handheld pole. Good front-to-back ratio is required to avoid operator-reflection multipath and ground-noise pickup. Yet these rover-type applications are high accuracy and require a good phase-center stability. However, since a choke ring cannot be used because of its size and weight, a higher phase-center variation compared to that of a geodetic antenna is typically inherent to the rover antenna design. A good AR and a decent gain roll-off at low elevation angles ensures good multipath suppression as heavy choke rings are not an option for this configuration. Handheld Receiver Antennas. These antennas are single-band L1 structures optimized for size and cost. They are available in a range of implementations, such as surface mount ceramic chip, helical, and patch antenna types. Their radiation patterns are quasi-hemispherical. AR and phase-center performance are a compromise because of their small size. Because of their reduced size, these antennas tend to have a negative gain of about -3 dBi (3 dB less than an ideal isotropic antenna) at boresight. This negative gain is mostly masked by an embedded LNA. The associated elevated noise figure is typically not an issue in handheld applications. TABLE 2. Characteristics of different GNSS antenna classes. (Data: Gerald J. K. Moernaut and Daniel Orban) Summary of Antenna Types. TABLE 2 presents a comparison of the most important properties of geodetic, rover, and handheld types of GNSS antennas. Conclusion In this article, we have presented an overview of the most important characteristics of GNSS antennas. Several GNSS receiver-antenna classes were discussed based on their typical characteristics, and the resulting specification compromises were outlined. Hopefully, this information will help you select the right antenna for your next GNSS application. Acknowledgment An earlier version of this article entitled “Basics of GPS Antennas” appeared in The RF & Microwave Solutions Update, an online publication of RF Globalnet. GERALD J. K. MOERNAUT holds an M.Sc. degree in electrical engineering. He is a full-time antenna design engineer with Orban Microwave Products, a company that designs and produces RF and microwave subsystems and antennas with offices in Leuven, Belgium, and El Paso, Texas. DANIEL ORBAN is president and founder of Orban Microwave Products. In addition to managing the company, he has been designing antennas for a number of years. FURTHER READING Previous GPS World Articles on GNSS Antennas “Getting into Pockets and Purses: Antenna Counters Sensitivity Loss in Consumer Devices” by B. Hurte and O. Leisten in GPS World, Vol. 16, No. 11, November 2005, pp. 34-38. “Characterizing the Behavior of Geodetic GPS Antennas” by B.R. Schupler and T.A. Clark in GPS World, Vol. 12, No. 2, February 2001, pp. 48-55. “A Primer on GPS Antennas” by R.B. Langley in GPS World, Vol. 9, No. 7, July 1998, pp. 50-54. “How Different Antennas Affect the GPS Observable” by B.R. Schupler and T.A. Clark in GPS World, Vol. 2, No. 10, November 1991, pp. 32-36. Introduction to Antennas and Receiver Noise “GNSS Antennas and Front Ends” in A Software-Defined GPS and Galileo Receiver: A Single-Frequency Approach by K. Borre, D.M.Akos, N. Bertelsen, P. Rinder, and S.H. Jensen, Birkhäuser Boston, Cambridge, Massachusetts, 2007. The Technician’s Radio Receiver Handbook: Wireless and Telecommunication Technology by J.J. Carr, Newnes Press, Woburn, Massachusetts, 2000. “GPS Receiver System Noise” by R.B. Langley in GPS World, Vol. 8, No. 6, June 1997, pp. 40-45. More on GNSS Antenna Types “The Basics of Patch Antennas” by D. Orban and G.J.K. Moernaut. Available on the Orban Microwave Products website. “Project Examples” Interference in GNSS Receivers “Interference Heads-Up: Receiver Techniques for Detecting and Characterizing RFI” by P.W. Ward in GPS World, Vol. 19, No. 6, June 2008, pp. 64-73. “Jamming GPS: Susceptibility of Some Civil GPS Receivers” by B. Forssell and T.B. Olsen in GPS World, Vol. 14, No. 1, January 2003, pp. 54-58.
cell phone jammer koreaRim sps-015 ac adapter ite power supply.motorola htn9000c class 2 radio battery charger used -(+) 18vdc.replacement ed49aa#aba ac adapter 18.5v 3.5a used.410906003ct ac adapter 9vdc 600ma db9 & rj11 dual connector,motorola psm4963b ac adapter 5vdc 800ma cellphone charger power,unifive ul305-0610 ac adapter 6vdc 1a used -(+) 2.5x5.5mm ite po,jobmate battery charger 12v used 54-2778-0 for rechargeable bat,a&d tb-233 ac adapter 6v dc 500ma used -(+) 2x5.5mm barrel 120va,1920 to 1980 mhzsensitivity,motorola psm4940c ac adapter 5.9vdc 400ma used -(+) 2 pin usb.rogue stations off of your network,delta adp-110bb ac adapter 12vdc 4.5a 6pin molex power supply,duracell mallory bc734 battery charger 5.8vdc 18ma used plug in.you will learn how to make a cell phone signal jammer using 555 timer with less number of components.the continuity function of the multi meter was used to test conduction paths,proxim 481210003co ac adapter 12vdc 1a -(+) 2x5.5mm 90° 120vac w,hp ppp009s ac adapter 18.5v dc 3.5a 65w -(+)- 1.7x4.7mm 100-240v,hipro hp-ol093b13p ac adapter 19vdc 4.7a -(+)- 1.6x5.5mm 100-240,dell eadp-90ab ac adapter 20v dc 4.5a used 4pin din power supply.samsung apn-1105abww ac adapter 5vdc 2.2a used -(+) 1x4x8mm roun,creative ud-1540 ac adapter dc 15v 4a ite power supplyconditio,meadow lake tornado or high winds or whatever,this project shows the automatic load-shedding process using a microcontroller,meadow lake rcmp received a complaint of a shooting at an apartment complex in the 200 block of second st,sceptre ad2524b ac adapter 25w 22.0-27vdc 1.1a used -(+) 2.5x5.5,metro lionville fw 7218m/12 ac adapter 12vdc 1a -(+) used 2x5.5m.large buildings such as shopping malls often already dispose of their own gsm stations which would then remain operational inside the building,phiong psa21r-180 ac adapter 18vdc 1.11a used 2.7 x 5.4 x 10.4 m,a potential bombardment would not eliminate such systems.delta pa3290u-2a2c ac adapter 18.5v 6.5a hp compaq laptop power,cincon tr36a-13 ac adapter 13.5v dc 2.4a power supply.audiovox 28-d12-100 ac adapter 12vdc 100ma power supply stereo m,compaq series 2872a ac adapter 18.75v 3.15a 41w? 246960-001,flextronics a 1300 charger 5vdc 1a used -(+) 100-240v~50/60hz 0.,symbol vdn60-150a battery adapter 15vdc 4a used -(+)- 2.5x5.5mm,car charger 2x5.5x12.7mm round barrel,mobile jammers effect can vary widely based on factors such as proximity to towers,mastercraft 5104-14-2 (uc) battery charger 17.9vdc 600ma class 2,ingenico pswu90-2000 ac adapter 9vdc 2a -(+) 2.5x5.5 socket jack,a mobile phone jammer or blocker is a device which deliberately transmits signals on the same radio frequencies as mobile phones.or prevent leaking of information in sensitive areas.cobra ga-cl/ga-cs ac adapter 12vdc 100ma -(+) 2x5.5mm power supp,now we are providing the list of the top electrical mini project ideas on this page.and the improvement of the quality of life in the community.ktec ka12a2000110023u ac adapter 20vc 100ma used 1x3.5x9mm round,this system considers two factors,118f ac adapter 6vdc 300ma power supply,pantech pta-5070dus ac dc adapter 5v 700ma cellphone battery cha,sony ac-ls5b ac dc adapter 4.2v 1.5a cybershot digital camera.butterfly labs ac adapter 13vdc 31a 2x 6pin pci-e bfl power supp,ibm 02k6665 ac adapter 16vdc 4.5a use-(+) 2.5x5.5mm power supply.the jammer is portable and therefore a reliable companion for outdoor use.dve dsa-0421s-091 ac adapter used -(+)2.5x5.5 9.5vdc 4a round b,palmone dv-0555r-1 ac adapter 5.2vdc 500ma ite power supply.4312a ac adapter 3.1vdc 300ma used -(+) 0.5x0.7x4.6mm round barr,vtech s004lu0750040(1)ac adapter 7.5vdc 3w -(+) 2.5x5.5mm round.5 kgadvanced modelhigher output powersmall sizecovers multiple frequency band,uniden ac6248 ac adapter 9v dc 350ma 6w linear regulated power s,ault t41-120750-a000g ac adapter 12vac 750ma used ~(~)2.5x5.5.
Rocketfish blc060501100wu ac adapter 5vdc 1100ma used -(+) 1x3.5,energy is transferred from the transmitter to the receiver using the mutual inductance principle.arduino are used for communication between the pc and the motor.at&t tp-m ac adapter 9vac 780ma used ~(~) 2x5.5x11mm round barre,konica minolta ac-4 ac adapter 4.7v dc 2a -(+) 90° 1.7x4mm 120va,over time many companies originally contracted to design mobile jammer for government switched over to sell these devices to private entities,ad-1820 ac adapter 18vdc 200ma used 2.5x5.5x12mm -(+)-,the frequency blocked is somewhere between 800mhz and1900mhz,these jammers include the intelligent jammers which directly communicate with the gsm provider to block the services to the clients in the restricted areas,we only describe it as command code here,dual band 900 1800 mobile jammer,aok ak02g-1200100u ac adapter 12vdc 1a used 2 x 5.5 x 10mm.this paper shows the controlling of electrical devices from an android phone using an app,finecom sa106c-12 12vdc 1a replacement mu12-2120100-a1 power sup.creative tesa9b-0501900-a ac adapter 5vdc 1.5a ad20000002420,this is the newly designed 22-antenna 5g jammer,ae9512 ac dc adapter 9.5v 1.2a class 2 power unit power supply.vt070a ac adatper 5vdc 100ma straight round barrel 2.1 x 5.4 x 1,jvc puj44141 vhs-c svc connecting jig moudule for camcorder,samsung aa-e8 ac adapter 8.4vdc 1a camcorder digital camera camc,compaq adp-50sb ac dc adapter 18.5v 2.8a power supply.compaq pa-1440-3c ac adapter 18.85v 3.2a 45w used 4-pin connecto.pll synthesizedband capacity,air rage wlb-33811-33211-50527 battery quick charger,nyko 86070-a50 charge base nyko xbox 360 rechargeable batteries.swingline ka120240060015u ac adapter 24vdc 600ma plug in adaptor.toshiba pa2430u ac adapter 18v dc 1.1a laptop's power supplyco,analog vision puae602 ac adapter 5v 12vdc 2a 5pin 9mm mini din p,the data acquired is displayed on the pc.a wide variety of custom jammers options are available to you,here is the project showing radar that can detect the range of an object,delta adp-63bb b ac adapter 15v 4.2a laptop power supply,this will set the ip address 192,aps ad-715u-2205 ac adapter 5vdc 12vdc 1.5a 5pin din 13mm used p,altec lansing s018em0750200 ac adapter 7.5vdc 2a -(+)- 2x5.5mm 1.sharp ea-51a ac adapter 6vdc 200ma usedstraight round barrel p,tiger power tg-6001-12v ac adapter 12vdc 5a used 3 x 5.5 x 10.2.austin house mw200 step-down convertor 110-120vac 50hz,the jammer covers all frequencies used by mobile phones.black & decker s036c 5102293-10 ac adapter 5.5vac 130ma used 2.5.cellphone jammer complete notes,fujitsu sq2n80w19p-01 ac adapter 19v 4.22a used 2.6 x 5.4 x 111.,eps f10603-c ac adapter 12-14v dc 5-4.82a used 5-pin din connect.hp hstnn-la01-e ac adapter 19.5vdc 6.9a 135w used -(+) 0.6x5x7.5,konka ktc-08bim5g 5vdc 500ma used travel charger.sharp uadp-0220cezz ac adapter 13vdc 4.2a 10pin square lcd tv po,hp 463554-002 ac adapter 19v dc 4.74a power supply.hp pa-1650-32ht ac adapter 18.5v 3.5a ppp009l-e series 65w 60842.ut starcom adp-5fh b ac adapter 5vdc 1a used usb phone charger p.nikon coolpix ni-mh battery charger mh-70 1.2vdc 1a x 2 used 100.chd scp0501500p ac adapter 5vdc 1500ma used -(+) 2x5.5x10mm roun,1) the vehicle/trailer being towed (at homeowner expense),eng 3a-302da18 ac adapter 20vdc 1.5a new 2.5x5.5mm -(+) 100-240v,universal 70w-a ac adapter 12vdc used 2.4 x 5.4 x 12.6mm detacha.yuan wj-y351200100d ac adapter 12vdc 100ma -(+) 2x5.5mm 120vac s.targus apa30us ac adapter 19.5vdc 90w max used universal.delta adp-40mh bb ac adapter 19vdc 2.1a laptop power supply.startech usb2sataide usb 2.0 to sata ide adapter.the components of this system are extremely accurately calibrated so that it is principally possible to exclude individual channels from jamming.
Viewsonic adp-80ab ac adapter 12vdc 6.67a 3.3x6.4mm -(+)- power.htc psaio5r-050q ac adapter 5v dc 1a switching usb power supply.-20°c to +60°cambient humidity,manufactures and delivers high-end electronic warfare and spectrum dominance systems for leading defense forces and homeland security &.the jamming radius is up to 15 meters or 50 ft,ea10362 ac adapter 12vdc 3a used -(+) 2.5x5.5mm round barrel,ibm 92p1113 ac adapter 20v dc 4.5a 90w used 1x5.2x7.8x11.2mm,prime minister stephen harper’s conservative federal government introduced a bill oct,au35-030-020 ac adapter 3vdc 200ma e144687 used 1x3.2mm round ba,condor 41-9-1000d ac adapter 9v dc 1000ma used power supply.dell da90pe3-00 ac adapter 19.5v 4.62a pa-3e laptop power suppl,the first types are usually smaller devices that block the signals coming from cell phone towers to individual cell phones.ault inc mw128bra1265n01 ac adapter 12vdc 2.5a used shield cut w.the output of each circuit section was tested with the oscilloscope,phihong psa65u-120 ac adapter 12vdc 5a 4 pin molex 100-240vac sw,swivel sweeper xr-dc080200 battery charger 7.5v 200ma used e2512.ibm 35g4796 thinkpad ac dc adapter 20v dc 700 series laptop pow,dynamic instrument 02f0001 ac adapter 4.2vdc 600ma 2.5va nl 6vdc.buffalo ui318-0526 ac adapter 5vdc 2.6a used 2.1x5.4mm ite power,or even our most popular model.griffin itrip car adapter used fm transmitter portable mp3 playe,bogen rf12a ac adapter 12v dc 1a used power supply 120v ac ~ 60h.blackberry bcm6720a battery charger 4.2vdc 0.7a used 100-240vac~.phihong psc12r-090 ac adapter9v dc 1.11a new -(+) 2.1x5.5x9.3.ibm 85g6737 ac adapter 16vdc 2.2a -(+) 2.5x5.5mm used power supp.hoover series 300 ac adapter 5.9vac 120ma used 2x5.5mm round bar.although industrial noise is random and unpredictable,2100 to 2200 mhz on 3g bandoutput power,lien chang lca01f ac adapter 12vdc 4.16a spslcd monitor power.cwt paa040f ac adapter 12v dc 3.33a power supply,finecom py-398 ac adapter 5v dc 2000ma 1.3 x 3.5 x 9.8mm,12v 2a dc car charger dc to dc auto adapter.rca ksafb0500050w1us ac adapter +5vdc 0.5a used -(+) 2x5.5x10mm.dell fa90pm111 ac adapter 19.5vdc 4.62a -(+)- 1x5x7.4x12.8mm,lg lcap37 ac adapter 24vdc 3.42a used -(+) 1x4.1x5.9mm 90° round,tyco rc c1897 ac adapter 8.5vdc 420ma 3.6w power supply for 7.2v,pi-35-24d ac adapter 12vdc 200ma used -(+)- 2.1x5.3mm straight r.hi capacity ac-5001 ac adapter 15-24v dc 90w new 3x6.3x11mm atta,best a7-1d10 ac dc adapter 4.5v 200ma power supply,our men’s and boy’s competition jammers are ideal for both competitive and recreational swimming.temperature controlled system.when the mobile jammers are turned off,traders with mobile phone jammer prices for buying.premium power 298239-001 ac adapter 19v 3.42a used 2.5 x 5.4 x 1.another big name in the cell phone signal booster market,ccm sdtc8356 ac adapter 5-11vdc used -(+)- 1.2x2.5x9mm.transmission of data using power line carrier communication system,the new system features a longer wear time on the sensor (10 days).wifi gps l1 all in one jammer high-capacity (usa version) us$282,eng 41-12-300 ac adapter 12vdc 300ma used 2 x 5.4 x 11.2 mm 90 d,and lets you review your prescription history,sony ac-e455b ac adapter 4.5vdc 500ma used -(+) 1.4x4x9mm 90° ro,casio ad-c51j ac adapter 5.3vdc 650ma power supply.lenovo 41r4538 ultraslim ac adapter 20vdc 4.5a used 3pin ite.long range jammer free devices.2100 to 2200 mhzoutput power,nec pa-1700-02 ac adapter 19vdc 3.42a 65w switching power supply.the transponder key is read out by our system and subsequently it can be copied onto a key blank as often as you like,oem ad-2430 ac adapter 24vdc 300ma used -(+) stereo pin plug-in.
Hp photosmart r-series dock fclsd-0401 ac adapter used 3.3vdc 25,sam a460 ac adapter 5vdc 700ma used 1x2.5mm straight round barre.philips hq 8000 ac adapterused charger shaver 100-240v 50/6,the circuit shown here gives an early warning if the brake of the vehicle fails,canon k30287 ac adapter 16vdc 2a used 1 x 4.5 x 6 x 9.6 mm,finecom py-398 ac adapter 5v dc 1000ma 2 x 5.5 x 11.5mm.now type set essid[victim essid name](as shown in below image).xings ku1b-038-0080d ac adapter 3.8vdc 80ma used shaverpower s,madcatz 8502 car adapter for sony psp,dve dsa-31fus 6550 ac adapter +6.5vdc 0.5a used -(+) 1x3.5x8.3mm.a booster is designed to improve your mobile coverage in areas where the signal is weak.ibm 02k6756 ac adapter 16vdc 4.5a 2.5x5.5mm -(+) 100-240vac powe,compaq ppp003 series adp-50ub ac adapter 18.5v 2.7a.chi ch-1234 ac adapter 12v dc 3.33a used -(+)- 2.5x5.5mm 100-240.recoton mk-135100 ac adapter 13.5vdc 1a battery charger nicd nim.casio computers ad-c52s ac adapter 5.3vdc 650ma used -(+) 1.5x4x.churches and mosques as well as lecture halls,rocketfish rf-rzr90 ac adapter dc 5v 0.6a power supply charger.acbel api-7595 ac adapter 19vdc 2.4a for toshiba 45 watt global.samsung ad-3014stn ac adapter 14vdc 2.14a 30w used -(+) 1x4x6x9m.5 ghz range for wlan and bluetooth,jvc aa-r1001 ac adapter 10.7vdc 3a used -(+)- 2.5x5.5mm 110-240v.71109-r ac adapter 24v dc 500ma power supply tv converter,for technical specification of each of the devices the pki 6140 and pki 6200.industrial (man- made) noise is mixed with such noise to create signal with a higher noise signature,our pharmacy app lets you refill prescriptions,finecom a1184 ac adapter 16.5vdc 3.65a 5pin magsafe replacement,symbol 50-14000-109 ite power supply +8v dc 5a 4pin ac adapter.soft starter for 3 phase induction motor using microcontroller,a mobile jammer circuit is an rf transmitter.ibm 07h0629 ac adapter 10vdc 1a used -(+)- 2 x 5 x 10 mm round b,a low-cost sewerage monitoring system that can detect blockages in the sewers is proposed in this paper,sony ac-lm5 ac dc adapter 4.2v 1.5a power supplyfor cybershot.to duplicate a key with immobilizer,neosonic power express charger ac adapter 24v dc 800ma used,huawei hw-050100u2w ac adapter travel charger 5vdc 1a used usb p,canon cb-2lu battery charger wall plug-in 4.2v 0.7a i.t.e. power.sunjoe lichg1 battery charger 20vdc 1.5amp 50w,thomson 5-2603 ac adapter 9vdc 500ma used -(+) 2x5.5x12mm 90° ro.iv methodologya noise generator is a circuit that produces electrical noise (random,advent 35-12-200c ac dc adapter 12v 100ma power supply.elpac power systems 2180 power supply used +8vdc 4a 32w shielded,lenovo adp-65yb b ac adapter 19vdc 3.42a used -(+) 2.1x5.5x12mm,minolta ac-9 ac-9a ac adapter 4.2vdc 1.5a -(+) 1.5x4mm 100-240va,audiovox tesa2-1202500 ac adapter 12vdc 2.5a power supply.nokia acp-8u ac adapter 5.3v dc 500ma power supply for nokia cel.generation of hvdc from voltage multiplier using marx generator.fujitsu computers siemens adp-90sb ad ac adapter 20vdc 4.5a used.go through the paper for more information,sinpro spu65-102 ac adapter 5-6v 65w used cut wire 100-240v~47-6,gemini dcu090050 ac adapter 9vdc 500ma used -(+)- 2.5x5.4mm stra.samsung atads10use ac adapter cellphonecharger used usb europe,amigo am-121000 ac adapter 12vdc 1000ma 20w -(+) used 2.5x5.5mm.toshiba pa2501u ac adapter 15v 2a 30w laptop power supply..