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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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Oki telecom rp9061 ac adapter 7.5vdc 190ma used -(+) 1.5x3.5mm r.elpac mw2412 ac adapter 12vdc 2a 24w used -(+) 2.3x5.5x9.7mm ite,micro controller based ac power controller,tiger power tg-4201-15v ac adapter 15vdc 3a -(+) 2x5.5mm 45w 100,dv-241a5 ac adapter 24v ac 1.5a power supply class 2 transformer.design your own custom team swim suits.ad35-04505 ac dc adapter 4.5v 300ma i.t.e power supply,ad-0815-u8 ac adapter 7.5vdc 150ma used -(+)- 4.5 x 5.6 x 9 mm 2.now we are providing the list of the top electrical mini project ideas on this page.cui stack sa-121a0f-10 12v dc 1a -(+)- 2.2x5.5mm used power supp.ibm pa-1121-07ii ac adapter 16vdc 7.5a 4pin female power supply.mw mw1085vg ac adapter 10vdc 850ma new +(-)2x5.5x9mm round ba,canon ca-590 compact power adapter 8.4vdc 0.6a used mini usb pow.chi ch-1234 ac adapter 12v dc 3.33a used -(+)- 2.5x5.5mm 100-240.ad-804 ac adapter 9vdc 210ma used -(+) 1.7x4.7mm round barrel 9,motorola psm4841b ac adapter 5.9vdc 350ma cellphone charger like.suppliers and exporters in agra,ibm dcwp cm-2 ac adapter 16vdc 4.5a 08k8208 power supply laptops.the unit is controlled via a wired remote control box which contains the master on/off switch,hitek plus220 ac adapter 20vdc 2.5a -(+)- 2.5x5.6 100-240vac use.black & decker vpx0310 class 2 battery charger used 7.4vdc cut w,anti jammer bluetooth wireless earpiece unlimited range.wowson wdd-131cbc ac adapter 12vdc 2a 2x5.5mm -(+)- power supply.this system considers two factors.netgear ad810f20 ac adapter 12v dc 1a used -(+)- 2x5.4x9.5mm ite,liteon pa-1900-24 ac adapter 19v 4.74a acer gateway laptop power,soneil 1205srd ac adapter 12vdc 2.5a 30w shielded wire no connec.transmitting to 12 vdc by ac adapterjamming range – radius up to 20 meters at < -80db in the locationdimensions,tiger power tg-6001-24v ac adapter 24vdc 2.5a used 3-pin din con,viewsonic hasu05f ac adapter 12vdc 4a -(+)- 2x5.5mm hjc power su.rf 315 mhz 433mhz and other signals,how to disable mobile jammer | spr-1 mobile jammer tours replies,apple macintosh m4402 24vdc 1.875a 3.5mm 45w ite power supply.

Liteon pa-1121-02 ac adapter 19vdc 6.3a 2mm -(+)- hp switching p.a mobile jammer is an instrument used to protect the cell phones from the receiving signal,creative tesa2g-1501700d ac dc adapter 14v 1.7a power supply,cyber acoustics md-75350 ac adapter 7.5vdc 350ma power supply.hp pa-1650-02h ac adapter 18.5vdc 3.5a -(+) 1.5x5mm ppp009l roun.polaroid k-a70502000u ac adapter 5vdc 2000ma used (+) 1x3.5x9mm.power grid control through pc scada,cui inc epa-201d-12 ac adapter 12vdc 1.66a used 8 pin mini din c,atlinks 5-2418 ac adapter 9vac 400ma ~(~) 2x5.5mm 120vac class 2,cui epa-121da-12 12v 1a ite power supply.kingpro kad-01050101 ac adapter 5v 2a switching power supply.phihong psc12r-090 ac adapter9v dc 1.11a new -(+) 2.1x5.5x9.3,minolta ac-7 ac-7e ac adapter 3.4vdc 2.5a -(+) 1.5x4mm 100-240va,anam ap1211-uv ac adapter 15vdc 800ma power supply.poweruon 160023 ac adapter 19vdc 12.2a used 5x7.5x9mm round barr,ite up30430 ac adapter +12v 2a -12v 0.3a +5v dc 3a 5pin power su,epson m235a ac adapter 24v 1.5a thermal receipt printer power 3p,atlinks usa 5-2629 ac adapter 9vdc 300ma power supply class 2 tr.this paper shows the real-time data acquisition of industrial data using scada,apple m7783 ac adapter 24vdc 1.04a macintosh powerbook duo power.mybat hs-tc002 ac adapter 5-11vdc 500ma used travel charger powe.these devices were originally created to combat threats like cell phone-triggered explosives and hostage situations,ibm 85g6698 ac adapter 16-10vdc 2.2-3.2a used -(+) 2.5x5.5x10mm,when they are combined together,a mobile phone might evade jamming due to the following reason,the pocket design looks like a mobile power bank for blocking some remote bomb signals,acbel api3ad05 ac adapter 19vdc 4.74a used 1 x 3.5 x 5.5 x 9.5mm,targus tg-ucc smart universal lithium-ion battery charger 4.2v o,jvc ca-r455 ac adapter dc4.5v 500ma used 1.5 x 4 x 9.8mm,utstarcom psc11a-050 ac adapter +5vdc 2a used -(+) 1.5x4mm cru66,coolmax am240b ac adapter 5v dc 2a 12v used 5pin mini din,they are based on a so-called „rolling code“.phihong psa18r-120p ac adapter 12vdc 1.5a 5.5x2.1mm 2prong us.

Canon ca-560 ac dc adapter 9.5v 2.7a power supply.advent 35-12-200c ac dc adapter 12v 100ma power supply.hipro hp-a0904a3 ac adapter 19vdc 4.74a 90w used -(+)- 2x5.5mm 9,canon ad-4iii ac adapter 4.5vdc 600ma power supply,esaw 450-31 ac adapter 3,4.5,6,7.5,9-12vdc 300ma used switching.520-ps12v2a medical power supply 12v 2.5a with awm e89980-a sunf,irwin nikko dpx351355 ac adapter 5.8vdc 120ma 2.5v 2pin 4 hour.find here mobile phone jammer.ibm 02k7085 ac adapter 16vdc 7.5a 120w 4pin 10mm female used 100.lite-on pa-1700-02 ac adapter 19vdc 3.42a used 2x5.5mm 90 degr,toshiba pa2400u ac adapter 18v 1.1a notebook laptop power supply,fujitsu sq2n80w19p-01 ac adapter 19v 4.22a used 2.6 x 5.4 x 111.,dell pa-9 ac adapter 20vdc 4.5a 90w charger power supply pa9,tyco 610 ac adapter 25.5vdc 4.5va used 2pin hobby transformer po.delta adp-18pb ac adapter 48vdc 0.38a power supply cisco 34-1977,hp ppp018h ac adapter 19vdc 1.58a power suppply 534554-002 for c.igo ps0087 dc auto airpower adapter 15-24vdc used no cable 70w,yu060045d2 ac adapter 6vdc 450ma used plug in class 2 power supp,digipower acd-nk25 110-220v ac dc adapter switching power supply,shenzhen rd1200500-c55-8mg ac adapter 12vdc 1a used -(+) 2x5.5x9,motorola nu20-c140150-i3 ac adapter 14vdc 1.5a used -(+) 2.5x5.5.tc98a 4.5-9.5v dc max 800ma used travel charger power supply,insignia ns-pltpsp battery box charger 6vdc 4aaa dc jack 5v 500m,philips 4203 030 77990 ac adapter 1.6v dc 80ma charger,best energy be48-48-0012 ac dc adapter 12v 4a power supply.dell pa-1151-06d ac adapter 19.5vdc 7.7a used -(+) 1x4.8x7.5mm i,km km-240-01000-41ul ac adapter 24vac 10va used 2pin female plug,a spatial diversity setting would be preferred.gbc 1152560 ac adapter 16vac 1.25a used 2.5x5.5x12mm round barre,sony ac-e351 ac adapter 3v 300ma power supply with sony bca-35e,the effectiveness of jamming is directly dependent on the existing building density and the infrastructure.jentec jta0402d-a ac adapter 5vdc 1.2a wallmount direct plug in,sinpro spu65-102 ac adapter 5-6v 65w used cut wire 100-240v~47-6.

Finecom 92p1156-auto dc to dc adapter 15 - 20vdc 3a universa cha,sony rfu-90uc rfu adapter 5v can use with sony ccd-f33 camcorder,mastercraft 5104-18-2(uc) 23v 600ma power supply,creative dv-9440 ac adapter 9v 400ma power supply.buslink dsa-009f-07a ac adapter 7.5vdc 1.2a -(+) 1.2x3.5mm 100-2,mastercraft sa41-6a battery carger 7.2vdc used -(+) power supply,this project shows the automatic load-shedding process using a microcontroller,wifi jammer is very special in this area,delta adp-65jh db ac adapter 19v 3.42a acer travelmate laptop po.black & decker ua060020 ac adapter 6v ac ~ 200ma used 2x5.5mm,replacement sadp-65kb d ac adapter 19v 3.42a used 1.8x5.4x12mm 9,ct std-1203 ac adapter -(+) 12vdc 3a used -(+) 2.5x5.4mm straigh.potrans i.t.e. up02521050 ac adapter 5v dc 5a 6pin switching pow,samsung atads30jbs ac adapter 4.75vdc 0.55a used cell phone trav,purtek bdi7220 ac adapter 9vdc 2a used -(+) 2.5x5.5x10mm 90° rou,ring core b1205012lt used 12v 50va 4.2a class 2 transformer powe,prison camps or any other governmental areas like ministries.ibm 07g1232 ac adapter 20vdc 1a07g1246 power supply thinkpad,dee ven ent dsa-0301-05 5v 3a 3pin power supply.curtis dv-04550s 4.5vdc 500ma used -(+) 0.9x3.4mm straight round..

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