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Photo: Galileo Analysis of new Galileo signals at an experimental ground-based augmentation system (GBAS) compares noise and multipath in their performance to GPS L1 and L5. Raw noise and multipath level of the Galileo signals is shown to be smaller than those of GPS. Even after smoothing, Galileo signals perform somewhat better than GPS and are less sensitive to the smoothing time constant.  By Mihaela-Simona Circiu, Michael Felux, German Aerospace Center (DLR), and Sam Pullen, Stanford University Several ground-based augmentation system (GBAS) stations have become operational in recent years and are used on a regular basis for approach guidance. These include airports at Sydney, Malaga, Frankfurt and Zurich. These stations are so-called GBAS Approach Service Type C (GAST C) stations and support approaches only under CAT-I weather conditions; that is, with a certain minimum visibility. Standards for stations supporting CAT-II/III operations (low visibility or automatic landing, called GAST D), are expected to be agreed upon by the International Civil Aviation Organization (ICAO) later this year. Stations could be commercially available as soon as 2018. However, for both GAST C and D, the availability of the GBAS approach service can be significantly reduced under active ionospheric conditions. One potential solution is the use of two frequencies and multiple constellations in order to be able to correct for ionospheric impacts, detect and remove any compromised satellites, and improve the overall satellite geometry (and thus the availability) of the system. A new multi-frequency and multi-constellation (MFMC) GBAS will have different potential error sources and failure modes that have to be considered and bounded. Thus, all performance and integrity assumptions of the existing single-frequency GBAS must be carefully reviewed before they can be applied to an MFMC system. A central element for ensuring the integrity of the estimated position solution is the calculation of protection levels. This is done by modeling all disturbances to the navigation signals in a conservative way and then estimating a bound on the resulting positioning errors that is valid at an allocated integrity risk probability. One of the parameters that is different for the new signals and must be recharacterized is the residual uncertainty attributed to the corrections from the ground system (σpr_gnd). A method to assess the contribution of residual noise and multipath is by evaluating the B-values in GBAS, which give an estimate of the error contribution from a single reference receiver to a broadcast correction. Independent data samples over at least one day (for GPS) are collected and sorted by elevation angle. Then the mean and standard deviations for each elevation bin are determined. Here, we evaluate the E1 and E5a signals broadcast by the operational Galileo satellites now in orbit. In the same manner as we did for GPS L5 in earlier research, we determine the σpr_gnd values for these Galileo signals. As for GPS L5, results show a lower level of noise and multipath in unsmoothed pseudorange measurements compared to GPS L1 C/A code. DLR GBAS Facility DLR has set up a GBAS prototype at the research airport in Braunschweig (ICAO identifier EDVE) near the DLR research facility there. This ground station has recently been updated and now consists of four GNSS receivers connected to choke ring antennas, which are mounted at heights between 2.5 meters and 7.5 meters above equipment shelters. All four receivers are capable of tracking GPS L5 (in addition to GPS L1 and L2 semi-codeless) and Galileo E1 and E5a signals. Figure 1 gives an overview of the current ground station layout, and Table 1 gives the coordinates of the antennas. Figure 1. DLR ground facility near Braunschweig Airport, also shown in opening photo at left. Table 1. Ground receiver antenna coordinates. Smoothing Techniques The GBAS system corrects for the combined effects of multiple sources of measurement errors that are highly correlated between reference receivers and users, such as satellite clock, ephemeris error, ionospheric delay error, and tropospheric delay error, through the differential corrections broadcast by the GBAS ground subsystem. However, uncorrelated errors such as multipath and receiver noise can make a significant contribution to the remaining differential error. Multipath errors are introduced by the satellite signal reaching the antenna via both the direct path from the satellites and from other paths due to reflection. These errors affect both the ground and the airborne receivers, but are different at each and do not cancel out when differential corrections are applied. To reduce these errors, GBAS performs carrier smoothing. Smoothing makes use of the less noisy but ambiguous carrier-phase measurements to suppress the noise and multipath from the noisy but unambiguous code measurements. The current GBAS architecture is based on single-frequency GPS L1 C/A code measurements only. Single-frequency carrier smoothing reduces noise and multipath, but ionospheric disturbances can cause significant differential errors when the ground station and the airborne user are affected by different conditions. With the new available satellites (GPS Block IIF and Galileo) broadcasting in an additional aeronautical band (L5 / E5), this second frequency could be used in GBAS to overcome many current limitations of the single-frequency system. Dual-frequency techniques have been investigated in previous work. Two dual-frequency smoothing algorithms, Divergence Free (Dfree) and Ionosphere Free (Ifree), have been proposed to mitigate the effect of ionosphere gradients. The Dfree output removes the temporal ionospheric gradient that affects the single-frequency filter but is still affected by the absolute difference in delay created by spatial gradients. The main advantage of Dfree is that the output noise is similar to that of single-frequency smoothing, since only one single-frequency code measurement is used as the code input (recall that carrier phase noise on both frequencies is small and can be neglected). Ifree smoothing completely removes the (first-order) effects of ionospheric delay by using ionosphere-free combinations of code and phase measurements from two frequencies as inputs to the smoothing filter. Unlike the Dfree, the Ifree outputs contain the combination of errors from two code measurements. This increases the standard deviation of the differential pseudorange error and thus also of the position solution. Noise and Multipath in New GNSS Signals GBAS users compute nominal protection levels (H0) under a fault-free assumption. These protection levels are conservative overbounds of the maximum position error after application of the differential corrections broadcast by the ground system, assuming that no faults or anomalies affect the position solution. In order to compute these error bounds, the total standard deviation of each differentially corrected pseudorange measurements has to be modeled. The standard deviation of the residual uncertainty (σn, for the nth satellite) consists of the root-sum-square of uncertainties introduced by atmospheric effects (ionosphere, troposphere) as well as of the contribution of the ground multipath and noise. In other words, these error components are combined to estimate σn2 as described in the following equation:    (1) The ground broadcasts a value for σpr_gnd (described later in the section) associated with the pseudorange correction for each satellite. These broadcast values are based on combinations of theoretical models and actual measurements collected from the ground receivers that represent actual system characteristics. Unlike the ground, σpr_air is computed based entirely on a standardized error model. This is mainly to avoid the evaluation of multipath for each receiver and each aircraft during equipment approval. In addition to the characteristics of nearby signal reflectors, multipath errors are mainly dependent on signal modulation and other signal characteristics (for example, power, chip rate). In earlier research, we showed that the newly available L5 signals broadcast by the GPS Block IIF satellites show better performance in terms of lower noise and multipath. This mainly results from an increased transmitted power and a 10 times higher chip rate on L5 compared to the L1 C/A code signal. In this work, we extend this evaluation to the new Galileo signals and investigate their impact on a future multi-frequency, multi-constellation GBAS. Characterization of these new signals is based on ground subsystem measurements, since no flight data with GPS L5 or Galileo measurements are available at the moment. We assume that the improvements observed by ground receivers are also applicable to airborne measurements. This assumption will be validated as soon as flight data are available. The measurements used were collected from the DLR GBAS test bed over 10 days (note that Galileo satellite ground track repeatability is 10 sidereal days) between the December 14 and 23, 2013. In that period, four Galileo and four Block IIF GPS satellites were operational and broadcast signals on both aeronautical bands E1 / L1 and E5a / L5. In Figure 2, the suppression of multipath and noise on the Galileo signals can be observed, where the code multipath and noise versus elevation for GPS L1 C/A BSPK(1), Galileo E1 (BOC (1,1)) and Galileo E5a (BPSK(10)) signals are shown. The code multipath and noise was estimated using the linear dual-frequency combination described in equation (2), where MPi represents the code multipath and noise on frequency i, ρi the code measurement, and ϕi,and ϕj represent the carrier-phase measurements on frequencies i and j, respectively. Carrier phase noises are small and can be neglected.    (2) Figure 2. Raw multipath function of elevation for GPS L1, Galileo E1 (BOC (1,1)) and Galileo E5a (BPSK(10)) signals. The multipath on the Galileo E1 (BOC(1,1)) signal (the magenta curve) is lower than the GPS L1 C/A (BPSK(1))  (black curve), especially for low elevation, where the advantage of the E1 BOC(1,1) is more pronounced. The lower values can be explained by the wider transmission bandwidth on E1 and the structure of the BOC signal. Galileo E5a (green data in Figure 2) again shows a better performance than Galileo E1. This was expected due to the higher chip rate and higher signal power. A comparison of the raw multipath and noise standard deviations for GPS L1, L5 and Galileo E1, E5a signals is presented in Figure 3. Figure 3. Ratios of the multipath and noise standard deviation function of elevation. The curves there show the ratios of the standard deviations for each elevation bin. The values for GPS L1 are almost 1.5 times larger than those for Galileo E1 BOC(1,1) (green curve) for elevations below 20°. For high elevations, the ratio approaches 1.0. This corresponds to the observations in the raw multipath plot ( Figure 2). With the same signal modulation and the same chip rate, E5a and L5 have very similar results (red curve), and the ratio stays close to 1.0 for all elevations. The blue and the purple curves in Figure 3 show the ratio of GPS L1 C/A (BPSK(1)) and GPS L5 (BPSK(10)), and Galileo E1 (BOC(1,1)) and Galileo E5a (BPSK(10)), respectively. The ratio of GPS L1 to GPS L5 (blue curve) increases with elevation from values around 2.5 for low elevations, reaching values above 3.5 for elevations higher than 60°. As Galileo E1 performs better, the ratio between Galileo E1 and Galileo E5a (purple curve) is smaller, from a value of 1.5 for elevations below 10 degrees to a value of 3.0 for high elevations. Until now, we have presented the evaluation of raw code noise and multipath. However, in GBAS, carrier smoothing is performed to minimize the effect of code noise and multipath. The value that describes the noise introduced by the ground station is represented by a standard deviation called σpr_gnd and is computed based on the smoothed pseudoranges from the reference receivers. In the following section, we focus on the evaluation of σpr_gnd using different signals and different smoothing time constants. Note that, in this study, σpr_gnd contains only smoothed multipath and noise; no other contributions (for example, inflation due to signal deformation or geometry screening) are considered. B-values and σpr_gnd B-values represent estimates of the associated noise and multipath with the pseudorange corrections provided from each receiver for each satellite, as described in Eurocae ED-114A and RTCA DO-253C. They are used to detect faulty measurements in the ground system. For each satellite-receiver pair B(i,j), they are computed as:    (3) where PRCTX represents the candidate transmitted pseudorange correction for satellite i (computed as an average over all M(i) receivers), and PRCSCA(i,k) represents the correction for satellite i from receiver k after smoothed clock adjustment, which is the process of removing the individual receiver clock bias from each reference receiver and all other common errors from the corrections. The summation computes the average correction over all M(k) receivers except receiver j. This allows detection and exclusion of receiver j if it is faulty. If all B-values are below their thresholds, the candidate pseudorange correction PRCTX is approved and transmitted. If not, a series of measurement exclusions and PRC and B-value recalculations takes place until all revised B-values are below threshold. Note that, under nominal conditions using only single-frequency measurements, the B-values are mainly affected by code multipath and noise. Under the assumption that multipath errors are uncorrelated across reference receivers, nominal B-values can be used to assess the accuracy of the ground system. The standard deviation of the uncertainty associated with the contribution of the corrections (σpr_gnd) for each receiver m is related to the standard deviation of the B-values by:    (4) where M represents the number of the receivers and N represents the number of satellites used. The final sigma takes into account the contribution from all receivers and is computed as the root mean square of the standard deviation of the uncertainties associated with each receiver (Equation 4). Figure 4 shows the evaluation of (σpr_gnd) for the Galileo E1, BOC(1,1) signal and the GPS L1 C/A signal for increasing smoothing time constants (10, 30, 60, and 100 seconds). Starting with a 10-second smoothing constant, Galileo E1 shows much better performance than GPS L1. The difference shrinks as the smoothing constant increases due to the effectiveness of smoothing in reducing noise and short-delay multipath. However, even with 100-second smoothing (the purple curves), Galileo E1 BOC(1,1) shows lower values of (σpr_gnd). Figure 4. σ(pr_gnd) versus elevation for Galileo E1 (dotted lines) and GPS L1 (solid lines for different smoothing constants: red (10s), green (30s), cyan (60s), purple (100s). A similar comparison is presented in Figure 5, of the performance of GPS L1 and Galileo E5a. The Galileo E5a signal is significantly less affected by multipath, and the difference stays more pronounced than in the Galileo E1 – GPS L1, even with 100-second smoothing. It can be also observed that the Galileo signals have a lower sensitivity to the smoothing constant. The Galileo E1 signal shows an increase of sensitivity for low elevations (below 40°), while on E5a, a smoothing constant larger than 10 seconds has almost no impact on the residual error. Thus, a shorter smoothing constant on Galileo E5a generates approximately the same residual noise and multipath a 100-second smoothing constant on GPS L1. Figure 5. σ(pr_gnd) versus elevation for Galileo E5a (dotted lines) and GPS L1 (solid lines) for different smoothing constants: red (10s), green (30s), cyan (60s), purple (100s). The values for (σpr_gnd) are, however, impacted by the number of satellites which are used to determine a correction. Since only a very limited number of satellites broadcasting L5 and Galileo signals are currently available, these results should be considered preliminary. The first evaluations strongly indicate that with the new signals, we get better ranging performance. Based on the performance advantage of the new signals, a decrease of the smoothing constant is one option for future application. This would reduce the time required (for smoothing to converge) before including a new satellite or re-including a satellite after it was lost. In the current GAST-D implementation, based on GPS L1 only, guidance is developed based on a 30-second smoothing time constant. A second solution, one with 100 seconds of smoothing, is used for deriving the Dv and Dl parameters from the DSIGMA monitor and thus for protection level bounding (it is also used for guidance in GAST-C). During the flight, different flight maneuvers or the blockage by the airframe can lead to the loss of the satellite signal. Figure 6 shows the ground track of a recent flight trial conducted by DLR in November 2014. The colors represent the difference between the number of satellites used by the ground subsystem (with available corrections) and the number of satellites used by the airborne subsystem in the GAST-D position solution. One of the purposes of the flight was to characterize the loss of satellite signals in turns. In turns with a steeper bank angle, up to 3 satellites are lost (Turns 1, 3, and 4), while on a wide turn with a small bank angle (Turn 2), no loss of satellite lock occurred. It is also possible for airframe to block satellite signals, leading to a different number of satellites between ground and airborne even without turns. Figure 6. Ground track of a flight trial conducted by DLR. The colors represent difference between number of SVs used by the ground system and number of SVs used by the airborne. With this in mind, a shorter smoothing constant would allow the satellites lost to turns or to airframe blockage to be re-included more rapidly in the position solution. However, a new smoothing constant would have to be validated with a larger amount of data. Data from flights trials has to be evaluated as well to confirm that similar levels of performance are reresentative of the air multipath and noise. In a future dual-frequency GBAS implementation, an important advantage of lower multipath and noise is to improve the Ifree position solution. In earlier research, we demonstrated that the error level of the Dfree solution is almost the same as for single-frequency, but an increase in error by a factor of 2.33 was computed for the Ifree standard deviation based on L1 C/A code and L2 semi-codeless measurements. If the errors on L1 (E1) and L5 (E5a) code and carrier phase measurements are statistically independent the standard deviation of the σIfree can be written as,    (5) where α=1−f 21 ∕ f 25, and σL1,σL5 represent the standard deviations of the smoothed noise and multipath for L1 (E1) and L5 (E5a), respectively. Considering σpr_gnd,L1(E1)) = σpr_gnd,L5(E5a)) in equation (5), the noise and multipath error on Ifree (σIfree) increases by a factor of 2.59. Figure 7 shows the ratio σIfree/σL1 using measured data. We observe that the measured ratio (the black curve) is below the theoretical ratio computed based on the assumption of statistically independent samples (the constant value of 2.59). This is explained by the fact that the multipath errors in the measurements are not independent but have some degree of statistical correlation. The standard deviations are computed based on the same data set used in the raw multipath and noise assessment using 100-second smoothed measurements sorted into elevation bins of 10° spacing. Figure 7. Measured ratio σIfree/σL1 function of elevation. Conclusion We have shown how GBAS can benefit from the new signals provided by the latest generation of GPS and Galileo satellites. We have demonstrated improved performance in terms of lower noise and multipath in data collected in our GBAS test bed. When GBAS is extended to a multi-frequency and multi-constellation system, these improvements can be leveraged for improved availability and better robustness of GBAS against ionospheric and other disturbances. Acknowledgment Large portions of this work were conducted in the framework of the DLR internal project, GRETA. Manufacturers The ground facility consists of four JAVAD GNSS Delta receivers, all connected to Leica AR 25 choke ring antennas. Mihaela-Simona Circiu is is a research associate at the German Aerospace Center (DLR). Her research focuses on multi-frequency multi-constellation Ground Based Augmentation System. She obtained a 2nd level Specialized Master in Navigation and Related Applications from Politecnico di Torino. MIchael Felux is is a research associate at the German Aerospace Center (DLR). He is coordinating research in the field of ground-based augmentation systems and pursuing a Ph.D. in Aerospace Engineering at the Technische Universität München. Sam Pullen is a senior research engineer at Stanford University, where he is the director of the Local Area Augmentation System (LAAS) research effort. He has supported the FAA and others in developing GNSS system concepts, requirements, integrity algorithms, and performance models since obtaining his Ph.D. from Stanford in Aeronautics and Astronautics.

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Metrologic 3a-052wp05 ac adapter 5-5.2v 1a - ---c--- + used90.sceptre ad2524b ac adapter 25w 22.0-27vdc 1.1a used -(+) 2.5x5.5.starting with induction motors is a very difficult task as they require more current and torque initially,esaw 450-31 ac adapter 3,4.5,6,7.5,9-12vdc 300ma used switching,3 x 230/380v 50 hzmaximum consumption,switchbox lte24e-s1-1 ac adapter 5vdc 4a 20w used -(+)- 1.2 x 3.,oem ads0243-u120200 ac adapter 12vdc 2a -(+)- 2x5.5mm like new p,radio remote controls (remote detonation devices).cwt pa-a060f ac adapter 12v 5a 60w power supply,2100 to 2200 mhzoutput power.raheem is described to be around 6-2 with a slim build.codi a03002 ac adapter 20vac 3.6a used 3 pin square auto/air pow,ibm aa20530 ac adapter 16vdc 3.36a used 2.5 x 5.5 x 11mm,lei power converter 220v 240vac 2000w used multi nation travel a,hp adp-12hb ac adapter 12vdc 1a used -(+) 0.8x3.4 x 5.4 x 11mm 9.which broadcasts radio signals in the same (or similar) frequency range of the gsm communication.gps signal blocker jammer network,weather and climatic conditions,the marx principle used in this project can generate the pulse in the range of kv.50/60 hz permanent operationtotal output power.kodak mpa7701 ac adapter 24vdc 1.8a easyshare dock printer serie,nokia ac-5e ac adapter cell phone charger 5.0v 800ma euorope ver.for more information about the jammer free device unlimited range then contact me.liteon pa-1480-19t ac adapter (1.7x5.5) -(+)- 19vdc 2.6a used 1.,hipro hp-ok065b13 ac adapter 19vdc 3.43a 65w power supply laptop.scope dj04v20500a battery charger 4.2vdc 500ma used 100-240v ac.finecom a1184 ac adapter 16.5vdc 3.65a 5pin magsafe replacement.suppliers and exporters in delhi,btc adp-305 a1 ac adapter 5vdc 6a power supply,h.r.s global ad16v ac adapter 16vac 500ma used90 degree right,anoma ad-8730 ac adapter 7.5vdc 600ma -(+) 2.5x5.5mm 90° class 2.outputs obtained are speed and electromagnetic torque,finecom pa-1121 ac adapter 19vdc 6.32a 2.5x5.5mm -(+) 120w power.

Motorola 35048035-a1 ac adapter 4.8vdc 350ma spn4681c used cell.lenovo 92p1160 ac adapter 20vdc 3.25a new power supply 65w,car ac adapter used power supply special phone connector.ibm 85g6708 ac dc adapter 16v 2.2a power supplycondition: used,black & decker s036c 5102293-10 ac adapter 5.5vac 130ma used 2.5.ast adp45-as ac adapter 19vdc 45w power supply.power rider sf41-0600800du ac adapter 6vdc 800ma used 2 pin mole,canon ac-380 ac adapter 6.3vdc 0.4a power supply.wahl db06-3.2-100 ac adapter 3.2vdc 100ma class 2 transformer.be possible to jam the aboveground gsm network in a big city in a limited way,you will learn how to make a cell phone signal jammer using 555 timer with less number of components.apple a1172 ac adapter 18vdc 4.6a 16vdc 3.6a used 5 pin magnetic,edac ea1060b ac adapter 18-24v dc 3.2a used 5.2 x 7.5 x 7.9mm st,baknor 66dt-12-2000e ac dc adapter 12v 2a european power supply,cgo supports gps+glonass+beidou data in.tc-60a ac adapter 9vdc 1.3a -(+) 1.3x3.5mm 100-240vac used direc,this noise is mixed with tuning(ramp) signal which tunes the radio frequency transmitter to cover certain frequencies.energizer fm050012-us ac adapter 5v dc 1.2a used 1.7x4x9.7mm rou.bothhand enterprise a1-15s05 ac adapter +5v dc 3a used 2.2x5.3x9,atlinks 5-2527 ac adapter 9vdc 200ma used 2 x 5.5 x 10mm.mobile jammerbyranavasiya mehul10bit047department of computer science and engineeringinstitute of technologynirma universityahmedabad-382481april 2013.ningbo taller electrical tl-6 ac adapter 6vdc 0.3a used 2.1x5.4,hera ue-e60ft power supply 12vac 5a 60w used halogen lamp ecolin.blackbox jm-18221-na ac adapter 18vac c.t. 2.22a used cut wire,makita dc9100 fast battery chrgar 9.6vdc 1.5a used drill machine,recoton mk-135100 ac adapter 13.5vdc 1a battery charger nicd nim.increase the generator's volume to play louder than,oem ad-0760dt ac adapter 7.vdc 600ma new -(+)- 2.1x5.4x10mm.dean liptak getting in hot water for blocking cell phone signals,as overload may damage the transformer it is necessary to protect the transformer from an overload condition.apd asian power adapter wa-30b19u ac adapter 19vdc 1.58a used 1.,this paper describes different methods for detecting the defects in railway tracks and methods for maintaining the track are also proposed,purtek bdi7220 ac adapter 9vdc 2a used -(+) 2.5x5.5x10mm 90° rou.

Tif 8803 battery charger 110v used 2mm audio pin connector power.viewsonic adp-80ab ac adapter 12vdc 6.67a 3.3x6.4mm -(+)- power.energizer pl-6378 ac dc adapter5v dc 1a new -(+) 1.7x4x8.1mm 9.delta adp-15zb b ac adapter 12vdc 1.25a used -(+) 2.5x5.5x10mm r.toshiba tec 75101u-b ac dc adapter +24v 3.125a 75w power supply.3com 722-0004 ac adapter 3vdc 0.2a power supply palm pilot.d-link m1-10s05 ac adapter 5vdc 2a -(+) 2x5.5mm 90° 120vac new i,dsa-0151d-12 ac adapter 12vdc 1.5a -(+)- 2x5.5mm 100-240vac powe.2100-2200 mhzparalyses all types of cellular phonesfor mobile and covert useour pki 6120 cellular phone jammer represents an excellent and powerful jamming solution for larger locations,oh-57055dt ac adapter 12vdc 1500ma used -(+) 2x5.5x9.6mm round b,conair 0326-4108-11 ac adapter 1.2v 2a power supply.these jammers include the intelligent jammers which directly communicate with the gsm provider to block the services to the clients in the restricted areas,sparkle power fsp019-1ad205a ac adapter 19vdc 1a used 3 x5.5mm,mainly for door and gate control.braun 5 496 ac adapter dc 12v 0.4a class 2 power supply charger,premium power pa3083u-1aca ac adapter 15v dc 5a power supply.mobile phone jammer blocks both receiving and transmitting signal,prime minister stephen harper’s conservative federal government introduced a bill oct,insignia ns-pltpsp battery box charger 6vdc 4aaa dc jack 5v 500m.smartcharger sch-401 ac adapter 18.5vdc 3.5a 1.7x4mm -(+) 100-24,unifive ul305-0610 ac adapter 6vdc 1a used -(+) 2.5x5.5mm ite po,lenovo sadp-135eb b ac adapter 19v dc 7.11a used -(+)3x5.5x12.9.pa-1650-02h replacement ac adapter 18.5v 3.5a for hp laptop powe.nec may-bh0006 b001 ac adapter 5.3vdc 0.6a usede190561 100-240.acbel api3ad14 ac adapter 19vdc 6.3a used female 4pin din 44v086,sos or searching for service and all phones within the effective radius are silenced,a blackberry phone was used as the target mobile station for the jammer.273-1454 ac adapter 6vdc 200ma used 2.2x5.5mm 90 degree round ba,ibm aa20210 ac adapter 16vdc 3.36a used 2.5 x 5.5 x 11mm round b,globtek gt-4076-0609 ac adapter 9vdc 0.66a -(+)- used 2.6 x 5.5.hp compaq adp-65hb b ac adapter 18.5vdc 3.5a -(+) 1.7x4.8mm used,ault 7612-305-409e 12 ac adapter +5vdc 1a 12v dc 0.25a used.the complete system is integrated in a standard briefcase.

Tech std-2427p ac adapter 24vdc 2.7a used -(+) 2.5x5.5x9.5mm rou,nyko ymci8-4uw ac adapter 12vdc 1.1a used usb switching power su.cisco adp-30rb ac adapter 5v 3a 12vdc 2a 12v 0.2a 6pin molex 91-,we hope this list of electrical mini project ideas is more helpful for many engineering students,hipro hp-ow135f13 ac adapter 19vdc 7.1a -(+) 2.5x5.5mm used 100-.47µf30pf trimmer capacitorledcoils 3 turn 24 awg,mayday tech ppp014s replacement ac adapter 18.5v dc 4.9a used,set01b-60w electronic transformer 12vac 110vac crystal halogen l,compaq le-9702a ac adapter 19vdc 3.16a -(+) 2.5x5.5mm used 100-2,shenzhen rd1200500-c55-8mg ac adapter 12vdc 1a used -(+) 2x5.5x9,.

How to block a signal jammer - gps tracking device signal jammer detector