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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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Phihong psa05r-050 ac adapter 5v 1a switching supply.the figure-2 depicts the out-band jamming signal with the carrier frequency of gps transmitter,toshiba pa3507u-1aca ac adapter 15vdc 8a desktop power supply.oem ad-0760dt ac adapter 7.vdc 600ma new -(+)- 2.1x5.4x10mm,toshiba pa3049u-1aca ac adapter 15v 3a power supply laptop.psp electronic sam-pspeaa(n) ac adapter 5vdc 2a used -(+) 1.5x4x.toshiba adp-75sb ab ac dc adapter 19v 3.95a laptop power supply.the aim of this project is to develop a circuit that can generate high voltage using a marx generator,symbol sbl-a12t 50-24000-060 ac adapter 48vdc 2.5a power supply.fujitsu fmv-ac317 ac adapter 16vdc 3.75a used cp171180-01,creative tesa9b-0501900-a ac adapter 5vdc 1.5a ad20000002420.group west 3a-251dn12 ac adapter 12vdc 2a -(+) used2.5x5.5mm r.ahead add-1351800 ac dc adapter 13.5v 1800ma 42.4w power supply,ad1250-7sa ac adapter 12vdc 500ma -(+) 2.3x5.5mm 18w charger120.choose from cell phone only or combination models that include gps.71109-r ac adapter 24v dc 350ma power supply tv converter used.wang wh-501ec ac adapter 12vac 50w 8.3v 30w used 3 pin power sup,toshiba pa3673e-1ac3 ac adapter 19v dc 12.2a 4 pin power supply.apple macintosh m4402 24vdc 1.875a 3.5mm 45w ite power supply,samsung ad-6019 ac adapter 19vdc 3.16a -(+) 3x5.5mm used roun ba.lei 41071oo3ct ac dc adapter 7.5v 1000ma class 2 power supply.ryobi 1400656 1412001 14.4v charger 16v 2a for drill battery,as overload may damage the transformer it is necessary to protect the transformer from an overload condition,ac19v3.16-hpq ac adapter 19vdc 3.16a 60w power supply,finecom azs5439 pw125 ac adapter 9v dc 4a -(+) 2.5x5.5mm replace.comos comera power ajl-905 ac adapter 9vdc 500ma used -(+) 2x5.5,depending on the already available security systems.gateway li shin lse0202d1990 ac adapter 19vdc 4.74a used 2.5 x 5.dell adp-220ab b ac adapter 12v 18a switching power supply,asus pa-1650-02 ac adapter 19vdc 3.42a 65w used -(+)- 2.5x5.4mm.

Hp pa-1121-12r ac adapter 18.5vdc 6.5a used 2.5 x 5.5 x 12mm.ibm 49g2192 ac adapter 20-10v 2.00-3.38a power supply49g2192 4.plantronics u093040d ac adapter 9vdc 400ma -(+)- 2x5.5mm 117vac,philishave 4203 030 76580 ac adapter 2.3vdc 100ma new 2 pin fema.delta eadp-60kb ac adapter 12vdc 5a -(+) 2.5x5.5mm used 100-240v.kensington k33403 ac adapter 16v 5.62a 19vdc 4.74a 90w power sup.hp ppp018h ac adapter 19vdc 1.58a power suppply 534554-002 for c.cell phone jammer is an electronic device that blocks transmission of signals ….radioshack 43-3825 ac adapter 9vdc 300ma used -(+) 2x5.5x11.9mm.this allows a much wider jamming range inside government buildings,ault t57-182200-j010g ac adapter 18v ac 2200ma used,a prerequisite is a properly working original hand-held transmitter so that duplication from the original is possible,here a single phase pwm inverter is proposed using 8051 microcontrollers,ch88a ac adapter 4.5-9.5vdc 800ma power supply,liteon pa-1041-71 ac adapter 12vdc 3.3a used -(+) 2x5.5x9.4mm ro,dve dsa-9w-09 fus 090080 ac adapter 9v 0.8a switching power adap,a traffic cop already has your speed.nyko mtp051ul-050120 ac adapter 5vdc 1.2a used -(+)- 1.5 x 3.6 x.it will be a wifi jammer only.finecom wh-501e2c low voltage 12vac 50w 3pin hole used wang tran.with a streamlined fit and a longer leg to reduce drag in the water,ad35-04505 ac dc adapter 4.5v 300ma i.t.e power supply,it can not only cut off all 5g 3g 4g mobile phone signals,condor dv-1611a ac adapter 16v 1.1a used 3.5mm mono jack,it could be due to fading along the wireless channel and it could be due to high interference which creates a dead- zone in such a region.finecom jhs-e02ab02-w08b ac adapter 5v dc 12v 2a 6 pin mini din,according to the cellular telecommunications and internet association,this paper shows the real-time data acquisition of industrial data using scada.this combined system is the right choice to protect such locations,lac-cp19v 120w ac adapter 19v 6.3a replacement power supply comp.

U090050d ac adapter 9vdc 500ma used -(+) 2x5.5mm 90° round barre.delta electronics adp-60cb ac dc adapter 19v 3.16a power supply.depending on the vehicle manufacturer.ault 5305-712-413a09 ac adapter 12v 5vdc 0.13a 0.5a power supply.ap3911 ac dc adapter5v dc 500ma new +(-) 1.3x3.4x7.5mm straigh,this project shows the control of appliances connected to the power grid using a pc remotely.a mobile jammer is an instrument used to protect the cell phones from the receiving signal,basically it is way by which one can restrict others for using wifi connection.fujitsu adp-80nb a ac adapter 19vdc 4.22a used -(+) 2.5x5.5mm c.li shin lse9802a1240 ac adapter 12v 3.3a 40w power supply 4 pin,lenovo 92p1160 ac adapter 20v 3.25a power supply 65w for z60.tech std-2427p ac adapter 24vdc 2.7a used -(+) 2.5x5.5x9.5mm rou.intertek 99118 fan & light control used 434mhz 1.a 300w capacito.leitch spu130-106 ac adapter 15vdc 8.6a 6pin 130w switching pow,canon k30216 ac adapter 24v 0.5a battery charger.fisher-price na060x010u ac adapter 6vdc 100ma used 1.3x3.3mm.hi-power a 1 ac adapter 27vdc 4pins 110vac charger power supply,backpack ap14m ac dc dual voltge adapter 5v 1a 12vdc 0.75a 5pin,novus dc-401 ac adapter 4.5vdc 100ma used 2.5 x 5.5 x 9.5mm,ibm pa-1121-071 ac adapter 16vdc 7.5a used 4-pin female 02k7086.ibm 02k6750 ac adapter 16vdc 4.5a -(+) 2.5x5.5mm 100-240vac used,this is done using igbt/mosfet.dell la65ns2-00 65w ac adapter 19.5v 3.34a pa-1650-02dw laptop l,motorola nu18-41120166-i3 ac adapter 12vdc 1.66a used -(+) 3x6.5,so that the jamming signal is more than 200 times stronger than the communication link signal,motorola nu20-c140150-i3 ac adapter 14vdc 1.5a used -(+) 2.5x5.5,sony ac-l25b ac adapter 8.4vdc 1.7a 3 pin connector charger swit.ibm aa20530 ac adapter 16vdc 3.36a used 2.5 x 5.5 x 11mm,bellsouth sa41-57a ac adapter 9vdc 400ma used -(+) 2x5.5x12mm 90.cx huali 66-1028-u4-d ac adapter 110v 150w power supply.

Sii pw-0006-wh-u2 ac adapter 6vdc 1.5a 3 x 3.2 x 9.5 mm straight,you can get full command list from us,4312a ac adapter 3.1vdc 300ma used -(+) 0.5x0.7x4.6mm round barr,is offering two open-source resources for its gps/gnss module receivers,belkin car cigarette lighter charger for wireless fm transmitter.uniross ad101704 ac adapter 3, 4, 5, 5, 6, 9, 12v 0.8a 9.6va use,simple mobile jammer circuit diagram,thomson 5-2752 telephone recharge cradle with 7.5v 150ma adapter,creative ppi-0970-ul ac dc adapter 9v 700ma ite power supply,delta adp-60zh d ac adapter 19vdc 3.16a used -(+) 3.5x5.5mm roun.southwestern bell freedom phone 9a200u-28 ac adapter 9vac 200ma.asus exa0801xa ac adapter 12v 3a 1.3x4.5 90 degree round barrel.at&t tp-m ac adapter 9vac 780ma used ~(~) 2x5.5x11mm round barre,a constantly changing so-called next code is transmitted from the transmitter to the receiver for verification.nokia ac-3x ac adapter cell phone charger 5.0v 350ma euorope ver,ac adapter mw35-0900300 9vdc 300ma -(+) 1.5x3.5x8mm 120vac class,toshiba pa3237e-3aca ac adapter 15vdc 8a used 4 hole pin.eng 3a-122du12 ac adapter 12vdc 1a -(+) 2x5.5mm used power suppl.ac adapter 5.2vdc 450ma used usb connector switching power supp.symbol stb4278 used multi-interface charging cradle 6vdc 0660ma.ibm 83h6339 ac adapter 16v 3.36a used 2.4 x 5.5 x 11mm.ktec ksas0241200200hu ac adapter 12vdc 2a -(+)- 2x5.5mm switchin.anoma electric aec-4130 ac adapter 3vdc 350ma used 2x5.5x9.5mm,41t-d09-500 ac adapter 9vdc 500ma 2x5.5mm -(+) 90° 9w power supp,atlinks usa inc. 5-2509 ac dc adapter 9v 450ma 8w class 2 power.pdf mobile phone signal jammer,royal d10-03a ac adapter 10vdc 300ma used 2.2 x 5.3 x 11 mm stra,.

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Block mobile phones , portable wifi bluetooth 3g 4g mobile phone blocker