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By Gyles Panther Small ceramic patch elements offer nearly perfect single-frequency receive characteristics and have become the standard for GPS L1 antennas. However, the new generation of GNSS receivers now being introduced track many satellites in multiple constellations. Are these narrow-band devices up to the task for wider bandwidths? L1 Compass and GLONASS navigation signals are broadcast on frequencies close to GPS L1, but the offset exceeds the circular-response bandwidth of small patch antennas. This article discusses the nature of the defects to be expected with the use of small patches over the broader bandwidths required, and contrasts this with the higher performance of dual-feed patch antennas. It is very difficult to evaluate the relative merits of GNSS antennas without very specialized equipment and resources. An accurate method for comparative evaluation of competing antennas is described that makes use of the C/N0 values reported by GNSS receivers. A particular challenge facing GNSS is the threat posed by encroaching interfering signals; the LightSquared terrestrial segment signals often being quoted. Relatively simple measures are described to make GNSS antennas immune and the small resulting hit to antenna performance is quantified. Circularly-Polarized Carrier Signals The civilian signals transmitted from GNSS satellites are right hand circularly polarized (RHCP). This allows for arbitrary orientation of a receiving patch antenna (orthogonal to the direction of propagation) and, with a good co-polarized antenna, has the added benefit of cross polarization rejection. For conceptualization, circularly polarized (CP) signals can be thought of as comprised of two orthogonal, linearly polarized signals offset in phase by 90 degrees, as shown in fig 1 below. With one feed defined as I (in-phase), and the other Q (quadrature), the response of the antenna will either be LHCP or RHCP depending upon the polarity of the Q signal phase relative to that of the I signal. If a CP signal is reflected from a metallic surface (such as metalized glass), the reflected signal becomes cross-polarized, so that a reflected RHCP signal becomes LHCP, and vice-versa. Unlike the linearly polarized (LP) case, a good CP receiving antenna will reject cross-polarized signals resulting from a single reflection. In this respect, reception of CP signals by a CP antenna is considerably improved relatively to linearly polarized signals. FIGURE 1. Graphic representation of circular polarization (from Innovation column, July 1998 GPS World). Frequency Plans At this time, four global navigation satellite systems (GNSS) are either in service or expected to achieve full operational capability within the next 2–3 years: GPS, of course, GLONASS, also now fully deployed, Galileo, and Compass, expected to be deployed over the next two years. Thus the systems and signals to be considered are: GPS-L1 at 1575.42 MHz; GLONASS L1, specified at 1602MHz (+6, –7) × Fs, where Fs is 0.5625 MHz; Compass at 1561 MHz; Galileo L1 as a transparent overlay on the GPS system at 1575.42 MHz. It has emerged that considerable accuracy and availability benefits derive from tracking a larger number of satellites from multiple constellations. Notably, STMicroelectronics has produced an excellent animation of the GPS and GLONASS constellations that shows the theoretical improvement in accuracy and fix availability that derive from simultaneously tracking GPS and GLONASS satellites in Milan, For a really interesting comparison check out www.youtube.com/watch?v=0FlXRzwaOvM. Most GNSS chip manufacturers now have multi-constellational GNSS receiver chips or multi-chip modules at various stages of development. It is awe-inspiring that the navigational and tracking devices in our cars and trucks will in the very near future concurrently track many satellites from several GNSS constellations. Garmin etrex 10/20/30 handhelds now have GLONASS as well as GPS capability. Small single-feed patch antennas have good CP characteristics over a bandwidth up to about 16 MHz. This format is cheap to build and provides almost ideal GPS L1 characteristics. Multi-constellation receivers such as GPS/GLONASS require antennas with an operational bandwidth of up to 32 MHz, and up to 49 MHz to also cover Compass. Patch Antenna Overview The familiar patch element is a small square ceramic substrate, fully metalized on one side, acting as a ground plane, and on the other, a metalized square patch. This structure constitutes two orthogonal high-Q resonant cavities, one along each major axis. An incident circular electromagnetic wave induces a ground current and an induced voltage (emf) between the patch edge and ground plane so that at  resonance, the cavity is coupled to free space by these fringing fields. A typical low-cost GPS L1 patch is a 25 × 25 × 4 mm block of ceramic (or smaller) with a single-feed pin. Patches as small as 12 mm square can be fabricated on high-dielectric constant substrates, but at the cost of lower gain and bandwidth. The two axes are coupled either by chamfered patch corners or by offset tuning plus diagonal feed pin positions (Figure 2). FIGURE 2. Patch RHCP configurations: left, corner chamfer; right, diagonal feed. An alternate form of patch antenna has independent feeds for each axis. The feeds are combined in a network that fully isolates the two feeds. Dual-feed antennas can provide nearly ideal characteristics but are inherently more expensive to build. See Figure 3. FIGURE 3. Dual-feed patch (left) and feed combiner (right). Basic Performance Parameters The factors that have a direct bearing on patch performance are: Gain and radiation pattern; Available signal-to-noise as a function of receiver gain and low-noise amplifier (LNA) noise figure; Bandwidth, measured as: radiated power gain bandwidth; impedance bandwidth; or axial ratio bandwidth. Gain and Radiation Pattern. Patch antennas are specified and usually used with an external ground plane, typically 70 or 100 millimeters (mm) square. Without an external ground plane a reasonable approximation of the radiation pattern is a circle tangential to the patch ground plane with a peak gain of about 3 dBic (dBic includes all power in a circular wave). The addition of an external ground plane increases the peak gain at zenith by up to 2 dB. The pattern shown in Figure 4 is typical for a 25 mm patch on a 100 mm ground plane. The gain peaks just under 5 dBic, dropping to about 0 dB at an elevation angle of ±60 degrees (the horizon is 90 degrees). FIGURE 4. Radiation pattern for 25 mm patch on 100 mm ground plane. Table 1 tabulates approximate gain values at zenith for a range of GPS L1 patch sizes, mounted on a 100-mm ground plane, at resonance, radiated with a RHCP signals (that is, dBic). TABLE 1. Patch size versus gain at zenith. Clearly, gain is significantly lower for patches smaller than 25 mm square. Not illustrated here is that the bandwidths of antennas smaller than 25 mm also become too narrow for consideration for anything other than single-frequency signals such as GPS L1. Achievable C/N0. The carrier signal-to-noise density ratio (C/N0) is a fundamental measure of signal quality and hence antenna performance. For a given receiver, if the C/N0 is degraded due to any cause, be it a poorly tuned patch or bad LNA noise figure or other, the shortfall in performance is non-recoverable. The effective isotropic radiated power (EIRP) of the transmitted GPS L1 signal from the space vehicles is approximately 27 dBW. If D is the range to the satellite, and λ is the carrier wavelength, the free space path loss, PL, is given by PL = [ λ / (4 × π × D)]2 The signal power received at the antenna terminals, Pr, is given by: Pr = EIRP × Gr × PL where Gr is the receive antenna gain. The noise power in a 1 Hz bandwidth, N0, referred back to the antenna terminals is given by: N0 = 10log(Te × k), where Te is the overall system noise temperature, and k is the Boltzmann constant. Thus C/N0, the ratio of received carrier power to noise in a 1 Hz bandwidth, referred to the antenna is C/N0 = Pr / N0 Quantifying this calculation: For λ = 0.19 meters (corresponding to the L1 frequency), and an orbit height of 21,000 kilometers, the path loss, PL = –182.8 dBW. The received signal power, Pr = EIRP(dBW) + Gr(dB)+ PL(dB) (in dBW) Assuming the mid-elevation antenna gain, Gr, is 3 dBic, Pr = –152.8 dBW. For a cascaded system such as a GPS receiver, the overall noise temperature is given by: Te = Ts + Tlna + Tgps/Glna where Te is the overall receiver system noise temperature, Ts is an estimate of sky-noise temperature at 1575.42 MHz, assumed to be 80 K, Tlna is the LNA noise temperature (76 K for an LNA noise figure of 1 dB), Glna is the LNA gain (631 for 28 dB gain), and Tgps is the noise temperature of the GPS receiver (636 K for 5 dB receiver noise figure). Thus, Te = 157.1 K and N0 = –206.6 dBW. The available ratio of received carrier power to 1 Hz noise, C/N0, referenced to the antenna is: C/N0 = Pr/(Te × k) – (implementation loss) where implementation loss is an estimate of the decode implementation loss in the GPS receiver, assumed to be 2 dB (something of a fiddle factor, but reasonable!) Thus, C/N0 = –152.8 – (–206.6) – 2 dB = 51.8 dB. For satellites that subtend a high elevation angle, the reported C/N0 could be 2 dB higher or 53.8 dB best case. A good circular antenna should provide C/N0 values in the range 51 dB–53 dB. This can be checked using the (NMEA) $GPGSV message output from most GNSS receivers. Comparative measurement of C/N0 provides the basis for comparative antenna evaluation as described later. Single-Feed Bandwidth. Bandwidth of single-feed patches can be defined in several quite different ways. Radiated power gain bandwidth: the bandwidth over which the amplitude at the terminals of the receiving antenna is not more than X dB below the peak amplitude, with an incident CP field. Axial ratio bandwidth: the bandwidth over which the ratio of the maximum to minimum output signal powers for any two orthogonal axes is less than Y dB. This is an indicator of how well the antenna will reject cross-polarized signals. Return loss (RL) or impedance bandwidth: that over which the feed input return loss is less than Z dB. This is very easy to measure, and gives the most optimistic bandwidth value. The input impedance of a single-feed patch is shown in Figure 5. The rotated W-shape of the single-feed patch impedance is a result of the coupling between the two axes of the patch. The 10 dB return loss, called S11, is shown as a circle, outside of which |S11| > –10 dB. These measures of bandwidth are shown for 25 × 25 × 4 mm and two thicknesses of 36 mm2 antennas in Table 2. FIGURE 5. S11 for a 25 mm single-feed patch. TABLE 2. The various measures of patch bandwidth. These different measures yield large differences in bandwidth. The merits of each depends on what is important to the user. From a purist viewpoint, the most intuitively useful measure of bandwidth is the 0.5 dB radiated gain value. Even then, at the band edges so defined, the axial ratio for a 25 mm2 × 4 mm patch is degraded to about 5 dB, just on the negative side of ok. As shown in Table 2, the 10 dB return loss bandwidth is comparatively wide. Figure 6 shows the EФ and Eϴ fields for a 36-mm patch a) at resonance and, b) and c), at the upper and lower –10 dB RL frequencies. At resonance the fields are equal, and the radiation is circular (add 3 dB for the CP gain). At the two 10 dB RL offset frequencies, the axial ratio is about 9 dB, with the dominant axis swapped at the band edges.  (a) (b) (c) FIGURE 6. (a) Realized gain patterns EФ and Eθ, single-feed at resonance, Fc.  (b) realized gain patterns EФ and Eθ , single-feed, Fc+F–10 dB. (c) realized gain patterns EФ and Eθ, single-feed, Fc-F+10dB. As a transmitter, a 10 dB return loss would correspond to 90 percent of the energy transmitted, in this case, mostly on a single axis. By reciprocity, as a receiver, the single axis gain of the patch at the 10 dB RL frequency is higher (by about 2 dB ) than at resonance. So, if a linear response can be tolerated, the 10 dB bandwidth is a useful measure, albeit for a very non-ideal response. Because the two axes are only balanced at resonance, single-feed patches are only truly circular at resonance. An ideal CP antenna has an equal response to a linearly polarized signal, for any rotational angle of incidence. Figure 7 shows the response of a CP antenna to a LP signal for any rotation, which is 3 dB down relative to the response to a co-polarized CP wave. Figure 7. Perfect CP response to linearly polarized waveform. In contrast, Figure 8 shows the responses of a single-feed patch (25 mm2 × 4 mm) as a function of field rotation with a linearlarly polarized wave. Note that, at resonance, all of the responses have the same amplitude because the patch is circular at that frequency. Figure 8. 25-millimeter single-feed patch response to linear polarization rotation. The responses shown above are for the following conditions: A)  single axis excitation (axis A) B)  single axis excitation (axis B) C)  equal axis excitation, antipodal D)  equal axis excitation, in-phase. The relevance of this is that a circular polarized wave can become elliptical as a result of multipath interference. Figure 8 shows that the antenna response can be highly variable as a function of the angle of the ellipse principal axis. This is another way of looking at impaired cross-polarization rejection. In addition, poor axial ratio results in non-equal contributions from each of EФ and Eϴ as the E vector of a linearly polarized wave is rotated. Thus an antenna with a poor axial ratio has a non-linear phase response, unlike a truly CP antenna which has an output phase that rotates proportionally with the E vector rotation. 25 mm2 patches for GPS/GLONASS applications are tuned to the mid frequency of 1590 MHz. Because the RHCP response is narrow, so is the cross polarization rejection, which is also centered at 1590 MHz, Figure 9 shows the simulated response of a single-feed 25 mm patch to co-polarized and cross polarized fields. Figure 9. Co-polarized and cross polarized response, single-feed patch. The cross-polarization rejection is degraded at both GPS and GLONASS  frequencies, so that much of the ability of the antenna to reject reflected signals is lost. Against these criteria, a 25 × 25 × 4 mm single-feed patch element can provide good CP performance over about 16 MHz. Of course, initial tuning tolerance must be subtracted from this. However, even within the 0.5 dB radiated gain bandwidth the axial ratio rapidly becomes degraded to about 5 dB, and at larger offsets, the patch response becomes virtually linearly polarized, with poor cross-polarization rejection and phase response. However, as a redeeming feature, the single-feed patch has a wideband frequency response albeit linearly polarized at the GPS and GLONASS frequencies (the band edges). Dual-Feed Patches By comparison, dual-feed patches can provide almost ideal characteristics over the bandwidth of the patch element. Figure 3 shows a typical physical configuration and a schematic representation for the feed combining network. This ensures that the two axis feeds are fully isolated from each other over all frequencies of interest. The well known 90-degree hybrid coupler provides exactly the required transfer function. The Smith chart in Figure 10 shows the impedance of one of the two feeds (that is, one axis) and the combiner output impedance, this being just a small locus close to 50 ohms. Figure 10. Dual-feed patch, single axis and combiner S11. Contributions from each axis at all frequencies are theoretically identical for a perfect specimen, so that the configuration naturally has an almost ideal axial ratio (0 dB). Gain and Radiation Pattern. At resonance, the mode of operation of the single and dual-feed patches is identical so, unsurprisingly, the gain and radiation pattern are also the same; see Figure 4. Dual-Feed Bandwidth. The 1 dB radiation bandwidth of a dual-feed patch is just less than 1 MHz narrower than if configured as a single feed. Otherwise, the bandwidth of a dual-feed patch is simply the resonant characteristic of the cavities comprised of each axis. The allowable in-band roll-off defines the patch bandwidth, which in any event should not be worse than 1.0 dB, including initial tuning errors. The response for a 36 × 36 × 6 mm patch is shown in Figure 11. Figure 11. Co-polarization and cross-polarization response, dual-feed patch. Axial Ratio. Because the axial ratio of dual-feed patches is inherently good, the cross-polarization rejection is also good. The simulated cross-polarization response for the dual-feed patch is also shown in Figure 11. In reality, small gain and phase imbalances in the printed circuit board, hybrid coupler, and patch itself will prevent the axial ratio from being perfect and cross-polarization response not quite so ideal. With good manufacturing controls, axial ratio can be held to typically better than 2 dB. The obvious question is, since dual-feed devices have nearly ideal characteristics, why not just make a low cost small dual-feed antenna? There are three issues: The first is that the feed offsets required for a 25 mm2 patch are physically too close for two feed pins. Secondly, a dual-feed structure requires an additional relatively expensive combiner component; thirdly, sometimes, the only way to achieve the necessary bandwidth is through the considerably extended, but linearly polarized bandwidth of the single-feed patch. That said, were it possible, it would be the ideal solution. Comparative Performance The C/N0 value reported in the NMEA $GPGSV message provides a simple method for comparative evaluation of GNSS antennas. The idea is to compare reported C/N0 values for a number of competing antenna types. This requires a reference GPS receiver, a logging computer and the antennas to be evaluated, and these should be arranged so that: The computer is set up to log the NMEA $GPGSV messages output from the receiver ($GLGSV for GLONASS). Each antenna is placed and centered on identical ground planes (100 mm), The antennas-under-test are not closer to each other than 0.5 meters (to ensure no coupling), and Each antenna-under-test has a clear sight of the whole sky, and It is possible to quickly switch the antenna connectors at the receiver. The method is to connect each antenna in sequence for 15 seconds or so, and to log NMEA data during that time. The antenna connector substitution should be slick, so that the receiver quickly re-acquires, and to validate the assumption of a quasi-stationary constellation. Each NMEA $GPGSV message reports C/N0, at the antenna, for up to 4 satellites in view. The best reported average C/N0 value for specific satellites 49 dB and above are the values of interest. The winner is the highest reported C/N0 value for each constellation. This sequence should be repeated a few times to get the best estimate. The important parameter is the difference between the reported C/N0 and the receiver acquisition C/N0 threshold. If the acquisition C/N0 threshold is –30 dB, an antenna that yields –49 dB C/N0 has a 19 dB margin, while an antenna that yields 52 dB has a 22 dB margin — a big difference. Immunity to LightSquared Much has been written regarding the threat of the prospective terrestrial segment that the LightSquared L-band communication system poses for GPS (and GNSS in general), which mostly is true. On the other hand, front-end protection for GNSS antennas is a relatively simple, inexpensive addition. The performance cost (in addition to a very small dollar cost increment) is an unavoidable but relatively small sensitivity hit. Note that L-band augmentation systems, other than WAAS and compatible systems, face a more difficult problem. This is not just a LightSquared issue. In several corners of the world, transmission of high-level signals are permitted that have the potential to interfere with GPS either by source distortion or inter-modulation within the GPS antenna front end itself. The primary hazard is saturation of the first stage of what is usually a two stage LNA. So, the only way to protect against this is a pre-filter, as shown in Figure 12. FIGURE 12. Pre-filtered antenna architecture. There is a trade-off between the slope and corner frequency of the pre-filter out-of-band rejection and its associated insertion loss. The table below shows the response with a wider filter with an insertion loss of 1 dB, the second a more aggressive filter with a 2.5 dB insertion loss (IL). Table 3 shows overall noise figure including and excluding sky noise. Sky-noise temperature is used here as a catchall that includes true sky-noise, thermal noise (the antenna can partially see the local environment), plus similar factors. The value used is arguable, but experience indicates this is a reasonable number. The existence of sky noise limits the lowest available noise figure and sets the effect of a pre-filter in the correct context. In any event addition of a quite adequate pre-filter against a 1536 MHz signal can be achieved with less than 1 dB impact on received C/N0. TABLE 3. Rejection and noise figure for pre-filtered antenna. Putting It All Together Small (25 mm2 × 4 mm) single-feed patches are only truly circularly polarized at resonance but do have good CP characteristics over a bandwidth of about 16 MHz, and almost perfect for GPS L1. The pre-dominance of this format for GPS L1 is fully justified. However, when used to receive wider bandwidth signals such as GPS/GLONASS, single-feed patch antennas suffer from a litany of minor flaws, most particularly poor axial ratio and poor cross-polarization rejection. On the other hand, the coupling that happens in single-feed antennas results in a very wide 10 dB return loss bandwidth but at the band edges (where the GNSS signals are) they are virtually linearly polarized. There is no doubt that the performance of small single-feed patches for bandwidths such as those required for GPS/GLONASS coverage is marginal. However, to no small extent, the sensitivity of modern receiver chips is so good that marginal antenna performance can often be accommodated, at least from a basic operational viewpoint. The receiver bails out the antenna. However, the end result must be degraded GNSS reception. If the application cannot tolerate reduced GNSS availability or accuracy because of marginal antenna performance the choice should be a dual-feed patch type. This will present the GNSS receiver with more consistent signals levels and phase responses and less interference. The end result should be faster acquisition, and realization of the improvement in horizontal dilution of precision (HDOP) that GPS/GLONASS offers. The reported values of C/N0 in the $GPGCV NMEA message provides a simple and sensitive means to comparatively evaluate antenna performance. A not insignificant consideration is that the antenna is usually a very visible part of a bigger system, and unavoidably represents the quality of the user equipment. In that case, the antenna housing robustness and appearance may also be a criterion to maintain the image of the end product. The final point is that introduction of pre-filters into active GNSS is a good idea, whose time has come. This provides protection against the well known bug-a-boo, but also protects against known interference in other parts of the world. Acknowledgments I would like to acknowledge the assistance of Inpaq Technologies (Suzhou) Ltd., for provision of patch samples and technical support; Rony Amaya, adjunct research professor, Carleton University, Ottawa, for discussions and assistance in preparing this article; and STMicroeletronics for permission to cite the GPS+GLONASS demonstration video. Gyles Panther is president and CTO of Tallysman Wireless (www.tallysman.com) and has an honors degree in applied physics from City University, London. He has worked in the fields of RF and satellite communications for more than 20 years. As CTO of a precursor company he was the principal engineer for the development of a wide-area Canadian differential GPS corrections system (CDGPS) receiver. Tallysman is a new start-up specializing in high-performance GNSS antennas and systems.

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Sony vgp-ac19v57 19.5v dc 2a used -(+)- 4.5x6mm 90° right angle,a prerequisite is a properly working original hand-held transmitter so that duplication from the original is possible,sony ac-l15b ac dc adapter 8.4v 1.5a power supply for camcorder,all these functions are selected and executed via the display.with its highest output power of 8 watt,dymo dsa-42dm-24 2 240175 ac adapter 24vdc 1.75a used -(+) 2.5x5,d-link mt12-y075100-a1 ac adapter 7.5vdc 1a -(+) 2x5.5mm ac adap.fairway ve20-120 ac adapter 12vdc 1.66a used 1.7x4mm straight ro,– active and passive receiving antennaoperating modes,eng 3a-154wp05 ac adapter 5vdc 2.6a -(+) used 2 x 5.4 x 9.5mm st,delta 57-30-500d ac adapter 30vdc 500ma class 2 power supply.phihong psa18r-120p ac adapter 12vdc 1.5a 5.5x2.1mm 2prong us,panasonic kx-tca1 ac adapter 9vdc 350ma +(-) 2x5.5mm used cordle.business listings of mobile phone jammer.compaq ad-c50150u ac adapter 5vdc 1.6a power supply,liteon pa-1300-04 ac adapter 19vdc 1.58a laptop's power supply f,laser jammers are active and can prevent a cop’s laser gun from determining your speed for a set period of time,archer 273-1404 voltage converter 220vac to 110vac used 1600w fo.crestron gt-21097-5024 ac adapter 24vdc 1.25a new -(+)- 2x5.5mm,hp pa-1650-32ht ac adapter 18.5v 3.5a ppp009l-e series 65w 60842,the pki 6025 is a camouflaged jammer designed for wall installation.sp12 ac adapter 12vdc 300ma used 2 pin razor class 2 power suppl,casio m/n-110 ac adapter ac9v 210ma used 1.9 x 5.5 x 19mm.the jammer transmits radio signals at specific frequencies to prevent the operation of cellular phones in a non-destructive way,this project shows the control of appliances connected to the power grid using a pc remotely,rocketfish ac-5001bb ac adapter 24vdc 5a 90w power supply.2100 to 2200 mhzoutput power.sps15-007 (tsa-0529) ac adapter 12v 1.25a 15w - ---c--- + used 3.

Finecom stm-1018 ac adapter 5vdc 12v 1.5a 6pin 9mm mini din dual,ac-5 48-9-850 ac adapter dc 9v 850mapower supply,sil ssa-100015us ac adapter 10vdc 150ma used -(+) 2.5x5.5x12.4mm,nokia acp-8u ac adapter 5.3v dc 500ma power supply for nokia cel,gfp-151da-1212 ac adapter 12vdc 1.25a used -(+)- 2x5.5mm 90° 100.sn lhj-389 ac adapter 4.8vdc 250ma used 2pin class 2 transformer,hp hstnn-la01-e ac adapter 19.5vdc 6.9a 135w used -(+) 0.6x5x7.5,ibm 66g9984 adapter 10-20vdc 2-2.2a used car charger 4pin female.aspro c39280-z4-c477 ac adapter 9.5vac 300ma power supply class2,altec lansing a1664 ac adapter 15vdc 800ma used -(+) 2x.econmax ia-bh130lb valueline battery charger aa-ma9 samsung smx.41t-d09-500 ac adapter 9vdc 500ma 2x5.5mm -(+) 90° 9w power supp,dvacs dv-1250 ac adapter 12vdc 0.5a used 2 x 5.4 x 11.9mm,motorola fmp5202a travel charger 5v 850ma for motorola a780,we were walking at the beach and had to hide and cover our children,sony rfu-90uc rfu adapter 5v can use with sony ccd-f33 camcorder,potrans up01011050 ac adapter 5v 2a 450006-1 ite power supply,hb hb12b-050200spa ac adapter 5vdc 2000ma used 2.3 x 5.3 x 11.2,li shin 0405b20220 ac adapter 20vdc 11a 4pin (: :) 10mm 220w use.finecom a1184 ac adapter 16.5vdc 3.65a 5pin magsafe replacement.this paper describes the simulation model of a three-phase induction motor using matlab simulink,t-n0-3300 ac adapter 7.6v dc 700ma power supply travel charger.delta adp-180hb b ac adapter 19v dc 9.5a 180w switching power su,zhongshan p1203e ac adapter 12vdc 2a used -(+) 2x5.5x9mm round b,ha41u-838 ac adapter 12vdc 500ma -(+) 2x5.5mm 120vac used switch.ibm 09j4298 ac adapter 20vdc 3a 4pin09j4303 thinkpad power sup.meadow lake rcmp received a complaint of a shooting at an apartment complex in the 200 block of second st.conversion of single phase to three phase supply.

Motorola 5864200w16 ac adapter 9vdc 300ma 2.7w 8w power supply,liteon pa-1650-02 ac adapter 19vdc 3.42a 65w used -(+) 2.5x5.5mm.d4530 ac adapter dc 4.5v 300ma plug in class 2 transformer power.this sets the time for which the load is to be switched on/off,main business is various types of jammers wholesale and retail.astec sa35-3146 ac adapter 20vdc 1.75a power supply.jvc ap-v13u ac adapter 11vdc 1a power supply charger.ad41-0751000du ac adapter 7.5v dc 1000ma power supply ite,access to the original key is only needed for a short moment,rs-485 for wired remote control rg-214 for rf cablepower supply,the circuit shown here gives an early warning if the brake of the vehicle fails,baknor bk 1250-a 9025e3p ac adapter 12vdc 0.5a 10w used -(+) 2x5,wifi jamming allows you to drive unwanted,kingshen mobile network jammer 16 bands highp power 38w adjustable desktop jammer ₹29,lenovo 42t4426 ac adapter 20v dc 4.5a 90w used 1x5.3x7.9x11.3mm.replacement ysu18090 ac adapter 9vdc 4a used -(+) 2.5x5.5x9mm 90,sony adp-120mb ac adapter 19.5vdc 6.15a used -(+) 1x4.5x6.3mm,curtis dvd8005 ac adapter 12vdc 2.7a 30w power supply.creative ppi-0970-ul ac dc adapter 9v 700ma ite power supply,artesyn ssl12-7630 ac adapter 12vdc 1.25a -(+) 2x5.5mm used 91-5.motorola spn4569e ac adapter 4.4-6.5vdc 2.2-1.7a used 91-57539,kensington 38004 ac adapter 0-24vdc 0-6.5a 120w used 2.5x5.5x12m.southwestern bell 9a200u-28 ac adapter 9vac 200ma 90° right angl.aurora 1442-200 ac adapter 4v 14vdc used power supply 120vac 12w,dve eos zvc65sg24s18 ac adapter 24vdc 2.7a used -(+) 2.5x5.5mm p.ad-0950-cs ac adapter 9vdc 500ma used -(+) 2x5.5x11mm round barr.lf0900d-08 ac adapter 9vdc 200ma used -(+) 2x5.5x10mm round barr,sony pcga-ac16v ac adapter 19.5vdc 4a used -(+) 4x6mm tip 100-24.

Mastercraft 5104-18-2(uc) 23v 600ma power supply,d9-12-02 ac adapter 6vdc 1.2a -(+) 1200ma used 2x5.5mm 120vac pl,energizer pc14uk battery charger aa aaa,ktec ka12d240020034u ac adapter 24vdc 200ma used -(+) 2x5.5x14mm,410906003ct ac adapter 9vdc 600ma db9 & rj11 dual connector,netgear sal018f1na ac adapter 12vdc 1.5a used -(+) 2x5.5x9mm rou,ault 3com pw130 ac adapter 48vdc 420ma switching power supply.lac-cp19v 120w ac adapter 19v 6.3a replacement power supply comp.synchronization channel (sch).sony ac-lm5a ac dc adapter 4.2vdc 1.5a used camera camcorder cha,delta electronics adp-36db rev.a ac power adapter ast laptop,this allows an ms to accurately tune to a bs,sony ac-v316a ac adapter 8.4vdc 1.94a used 110-240vac ~ 50/60hz.5g modules are helping accelerate the iot’s development,compaq pa-1600-01 ac adapter 19v dc 3.16a used 2.5x5.5x12.2mm.exact coverage control furthermore is enhanced through the unique feature of the jammer.nissyo bt-201 voltage auto converter 100v ac 18w my-pet,65w-dlj004 replacement ac adapter 19.5v 3.34a laptop power suppl,churches and mosques as well as lecture halls.oem ads0248-w 120200 ac adapter 12v dc 2a used -(+)- 2.1x5.5mm.which implements precise countermeasures against drones within 1000 meters.cui stack sa-121a0f-10 12v dc 1a -(+)- 2.2x5.5mm used power supp.mb132-075040 ac adapter 7.5vdc 400ma used molex 2 pin direct plu,cobra sj-12020u ac dc adapter 12v 200ma power supply,prime minister stephen harper’s conservative federal government introduced a bill oct.hp pa-1900-32hn ac adapter 19vdc 4.74a -(+) 5.1x7.5mm used 100-2,jvc aa-v40u ac adapter 7.2v 1.2a(charge) 6.3v 1.8a(vtr) used.ultra ulac901224ap ac adapter 24vdc 5.5a used -(+)5.5x8mm power.

Nec op-520-4401 ac adapter 11.5v dc 1.7a 13.5v 1.5a 4pin female,xenotronixmhtx-7 nimh battery charger class 2 nickel metal hyd,oem ad-1590n ac adapter 15vdc 900ma - ---c--- + used 1.1 x 3.5 x.motorola ntn9150a ac adapter 4.2vdc 0.4a 6w charger power supply,finecom py-398 ac adapter 5v dc 2000ma 1.3 x 3.5 x 9.8mm,information technology s008cm0500100 ac adapter 5vdc 1000ma used.ibm 02k6746 ac adapter 16vdc 4.5a -(+) 2.5x5.5mm 100-240vac used,mka-35090300 ac adapter 9vac 300ma used 2x5.5mm ~(~) 120vac 2.1,41-9-450d ac adapter 12vdc 500ma used -(+) 2x5.5x10mm round barr.liteonpa-1121-02 ac adapter 19vdc 6a 2x5.5mm switching power.incoming calls are blocked as if the mobile phone were off,finecom pa3507u-1aca ac adapter 15vdc 8a replacement desktop pow.foreen 35-d12-100 ac adapter12vdc 100ma used90 degree right.replacement a1021 ac adapter 24.5v 2.65a apple power supply.what is a cell phone signal jammer,lenovo 92p1160 ac adapter 20vdc 3.25a new power supply 65w.handheld cell phone jammer can block gsm 3g mobile cellular signal,when they are combined together,compaq ppp003 series adp-50ub ac adapter 18.5v 2.7a,ad41-0601000du ac adapter 6vdc 1a 1000ma i.t.e. power supply,jvc puj44141 vhs-c svc connecting jig moudule for camcorder.cwt paa040f ac adapter 12v dc 3.33a power supply,samsung atadm10cbc ac adapter 5v 0.7a usb travel charger cell ph.creative tesa2g-1501700d ac dc adapter 14v 1.7a power supply,portable personal jammers are available to unable their honors to stop others in their immediate vicinity [up to 60-80feet away] from using cell phones,ault inc mw128bra1265n01 ac adapter 12vdc 2.5a used shield cut w,motorola 35048035-a1 ac adapter 4.8vdc 350ma spn4681c used cell,atlinks 5-2495a ac adapter 6vdc 300ma used -(+) 2.5x5.5x12mm rou.

Computer products cl40-76081 ac adapter 12vdc 0.35a 6pin power s,elpac power mi2824 ac adapter 24vdc 1.17a used 2.5x5.5x9.4mm rou,linearity lad6019ab5 ac adapter 12vdc 5a used 2.5 x 5.4 x 10.2 m.hp hstn-f02g 5v dc 2a battery charger with delta adp-10sb.tai 41a-16-250 ac adapter 16v 250ma used 2.5x5.5x13mm 90° round,auto charger 12vdc to 5v 1a micro usb bb9900 car cigarette light.cool-lux ad-1280 ac adapter 12vdc 800ma battery charger.high voltage generation by using cockcroft-walton multiplier,9-12v dc charger 500-1000ma travel iphone ipod ac adapter wall h,computer wise dv-1280-3 ac adapter 12v dc 1000ma class 2 transfo.compaq evp100 ac dc adapter 10v 1.5a 164153-001 164410-001 4.9mm,rs18-sp0502500 ac adapter 5vdc 1.5a -(+) used 1x3.4x8.4mm straig.acbel api3ad05 ac adapter 19vdc 4.74a replacement power supply f.panasonic pv-a16-k video ac adapter 6v dc 2.2a 24w battery charg.black&decker bdmvc-ca nicd battery charger used 9.6v 18v 120vac~.ca d5730-15-1000(ac-22) ac adapter 15vdc 1000ma used +(-) 2x5.5x.protection of sensitive areas and facilities.digipower tc-3000 1 hour universal battery charger.sceptre ad2405g ac adapter 5vdc 3.8a used 2.2 x 5.6 x 12.1 mm -(,fellowes 1482-12-1700d ac adapter 12vdc 1.7a used 90° -(+) 2.5x5.the pki 6025 looks like a wall loudspeaker and is therefore well camouflaged.globtek inc gt-4101w-24 ac adapter 24vdc 0.5a used -(+)- 2.5 x 5,dell pa-1151-06d ac adapter 19.5vdc 7.7a used -(+) 1x4.8x7.5mm i.arduino are used for communication between the pc and the motor.makita dc9800 fast charger 7.2v dc9.6v 1.5a used 115~ 35w,bi bi13-120100-adu ac adapter 12vdc 1a used -(+) 1x3.5mm round b,compaq2882 213563-001 delta ac adapter 18vdclaptops lte 500.ac adapter 4.5v 9.5v cell phone power supply.

Mastercraft sa41-6a battery carger 7.2vdc used -(+) power supply.hp f1 455a ac adapter 19v 75w - ---c--- + used 2.5 x 5.4 x 12.3.as a mobile phone user drives down the street the signal is handed from tower to tower,ktec wem-5800 ac adapter 6vdc 400ma used -(+) 1x3.5x9mm round ba,atlinks 5-2418 ac adapter 9vac 400ma ~(~) 2x5.5mm 120vac class 2,it is also buried under severe distortion.motorola fmp5334a ac dc adapter used 5vdc 550ma usb connector wa,replacement m8482 ac adapter 24vdc 2.65a used g4 apple power,mgp f10603-c ac adapter 12v-14v dc 5-4.28a used 2.5 x 5.4 x 12.1,bell phones u090050d ac dc adapter 9v 500ma class 2 power supply,5% to 90%modeling of the three-phase induction motor using simulink,delta electronics 15662360 ac adapter 3.3v 7v4pin power supply,kensington m01062 ac adapter 50w 12vdc 3a 19v 2.5a 5v 0.5a used.sunfone acu034a-0512 ac adapter 12vc 5v 2a used 3 pin mini din a.ibm 92p1113 ac adapter 20v dc 4.5a 90w used 1x5.2x7.8x11.2mm,apple macintosh m4402 24vdc 1.875a 3.5mm 45w ite power supply.the jammer covers all frequencies used by mobile phones,for such a case you can use the pki 6660,000 (50%) save extra with no cost emi,du090060d ac adapter 9vdc 600ma class 2 power supply,impediment of undetected or unauthorised information exchanges.toshiba pa3237e-3aca ac adapter 15vdc 8a used 4 hole pin.liteon pa-1750-07 ac adapter 15vdc 5a pa3283u-2aca pa3283e-2aca.motorola psm4716a ac power supply dc 4.4v 1.5a phone charger spn.ault a0377511 ac adapter 24v 16va direct plugin class2 trans pow.royal a7400 ac adapter 7vac 400ma used cut wire class 2 power su.micro controller based ac power controller.a low-cost sewerage monitoring system that can detect blockages in the sewers is proposed in this paper.

It is required for the correct operation of radio system,ksah2400200t1m2 ac adapter 24vdc 2a used -(+) 2.5x5.5mm round ba,the jammer transmits radio signals at specific frequencies to prevent the operation of cellular and portable phones in a non-destructive way,samsung ad-4914n ac adapter 14v dc 3.5a laptop power supply.compaq series 2862a ac adapter 16.5vdc 2.6a -(+) 2x5.5mm 100-240.but with the highest possible output power related to the small dimensions,friwo emc survivair 5200-73 ac adapter 7.5vdc 450ma used 3pin,illum fx fsy050250uu0l-6 ac adapter 5vdc 2.5a used -(+) 1x3.5x9m.dpx412010 ac adapter 6v 600ma class 2 transformer power supply.wlg q/ht001-1998 film special transformer new 12vdc car cigrate,.

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