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Figure 1. Distribution of the GPS+COMPASS tracking network established by the GNSS Research Center at Wuhan University and used as test network in this study. Data from a tracking network with 12 stations in China, the Pacific region, Europe, and Africa demonstrates the capacity of Compass with a constellation comprising four geostationary Earth-orbit (GEO) satellites and five inclined geosynchronous orbit (IGSO) satellites in operation. The regional system will be completed around the end of 2012 with a constellation of five GEOs, five IGSOs, and four medium-Earth orbit (MEO) satellites. By 2020 it will be extended into a global system. By Maorong Ge, Hongping Zhang, Xiaolin Jia, Shuli Song, and Jens Wickert China’s satellite navigation system Compass, also known as BeiDou, has been in deveopment for more than a decade. According to the China National Space Administration, the development is scheduled in three steps: experimental system, regional system, and global system. The experimental system was established as the BeiDou-1 system, with a constellation comprising three satellites in geostationary orbit (GEO), providing operational positioning and short-message communication. The follow-up BeiDou-2 system is planned to be built first as a regional system with a constellation of five GEO satellites, five in inclined geosynchronous orbit (IGSO), and four in medium-Earth orbit (MEO), and then to be extended to a global system consisting of five GEO, three IGSO, and 27 MEO satellites. The regional system is expected to provide operational service for China and its surroundings by the end of 2012, and the global system to be completed by the end of 2020. The Compass system will provide two levels of services. The open service is free to civilian users with positioning accuracy of 10 meters, timing accuracy of 20 nanoseconds (ns) and velocity accuracy of 0.2 meters/second (m/s). The authorized service ensures more precise and reliable uses even in complex situations and probably includes short-message communications. The fulfillment of the regional-system phase is approaching, and the scheduled constellation is nearly completed. Besides the standard services and the precise relative positioning, a detailed investigation on the real-time precise positioning service of the Compass regional system is certainly of great interest. With data collected in May 2012 at a regional tracking network deployed by Wuhan University, we investigate the performance of precise orbit and clock determination, which is the base of all the precise positioning service, using Compass data only. We furthermore demonstrate the capability of Compass precise positioning service by means of precise point positioning (PPP) in post-processing and simulated real-time mode. After a short description of the data set, we introduce the EPOS-RT software package, which is used for all the data processing. Then we explain the processing strategies for the various investigations, and finally present the results and discuss them in detail. Tracking Data The GNSS research center at Wuhan University is deploying its own global GNSS network for scientific purposes, focusing on the study of Compass, as there are already plenty of data on the GPS and GLONASS systems. At this point there are more than 15 stations in China and its neighboring regions. Two weeks of tracking data from days 122 to 135 in 2012 is made available for the study by the GNSS Research Center at Wuhan University, with the permission of the Compass authorities. The tracking stations are equipped with UR240 dual-frequency receivers and UA240 antennas, which can receive both GPS and Compass signals, and are developed by the UNICORE company in China. For this study, 12 stations are employed. Among them are seven stations located in China: Chengdu (chdu), Harbin (hrbn), HongKong (hktu), Lhasa (lasa), Shanghai (sha1), Wuhan (cent) and Xi’an (xian); and five more in Singapore (sigp), Australia (peth), the United Arab Emirates (dhab), Europa (leid) and Africa (joha). Figure 1 shows the distribution of the stations, while Table 1 shows the data availability of each station during the selected test period. Table 1. Data availability of the stations in the test network. There were 11 satellites in operation: four GEOs (C01, C03, C04, C05), five IGSOs (C06, C07, C08, C09, C10), and two MEOs (C11, C12). During the test time, two maneuvers were detected, on satellite C01 on day 123 and on C06 on day 130. The two MEOs are not included in the processing because they were still in their test phase. Software Packages The EPOS-RT software was designed for both post-mission and real-time processing of observations from multi-techniques, such as GNSS and satellite laser ranging (SLR) and possibly very-long-baseline interferometry (VLBI), for various applications in Earth and space sciences. It has been developed at the German Research Centre for Geosciences (GFZ), primarily for real-time applications, and has been running operationally for several years for global PPP service and its augmentation. Recently the post-processing functions have been developed to support precise orbit determinations of GNSS and LEOs for several ongoing projects. We have adapted the software package for Compass data for this study. As the Compass signal is very similar to those of GPS and Galileo, the adaption is straight-forward thanks to the new structure of the software package. The only difference to GPS and Galileo is that recently there are mainly GEOs and IGSOs in the Compass system, instead of only MEOs. Therefore, most of the satellites can only be tracked by a regional network; thus, the observation geometry for precise orbit determination and for positioning are rather different from current GPS and GLONASS. Figure 2 shows the structure of the software package. It includes the following basic modules: preprocessing, orbit integration, parameter estimation and data editing, and ambiguity-fixing. We have developed a least-square estimator for post-mission data processing and a square-root information filter estimator for real-time processing. Figure 2. Structure of the EPOS-RT software. GPS Data Processing To assess Compass-derived products, we need their so-called true values. The simplest way is to estimate the values using the GPS data provided by the same receivers. First of all, PPP is employed to process GPS data using International GNSS Service (IGS) final products. PPP is carried out for the stations over the test period on a daily basis, with receiver clocks, station coordinates, and zenith tropospheric delays (ZTD) as parameters. The repeatability of the daily solutions confirms a position accuracy of better than 1 centimeter (cm), which is good enough for Compass data processing. The station clock corrections and the ZTD are also obtained as by-products. The daily solutions are combined to get the final station coordinates. These coordinates will be fixed as ground truth in Compass precise orbit and clock determination. Compass and GPS do not usually have the same antenna phase centers, and the antenna is not yet calibrated, thus the corresponding corrections are not yet available. However, this difference could be ignored in this study, as antennas of the same type are used for all the stations. Orbit and Clock Determination For Compass, a three-day solution is employed for precise orbit and clock estimation, to improve the solution strength because of the weak geometry of a regional tracking network. The orbits and clocks are estimated fully independent from the GPS observations and their derived results, except the station coordinates, which are used as known values. The estimated products are validated by checking the orbit differences of the overlapped time span between two adjacent three-day solutions. As shown in Figure 3, orbit of the last day in a three-day solution is compared with that over the middle day of the next three-day solution. The root-mean-square (RMS) deviation of the orbit difference is used as index to qualify the estimated orbit. Figure 3. Three-day solution and orbit overlap. The last day of a three-day solution is compared with the middle day of the next three-day solution. In each three-day solution, the observation models and parameters used in the processing are listed in Table 2, which are similar to the operational IGS data processing at GFZ except that the antenna phase center offset (PCO) and phase center variation (PCV) are set to zero for both receivers and satellites because they are not yet available. Satellite force models are also similar to those we use for GPS and GLONASS in our routine IGS data processing and are listed in Table 2. There is also no information about the attitude control of the Compass satellites. We assume that the nominal attitude is defined the same as GPS satellite of Block IIR. Table 2. Observation and force models and parameters used in the processing. Satellite Orbits. Figure 4 shows the statistics of the overlapped orbit comparison for each individual satellite. The averaged RMS in along- and cross-track and radial directions and 3D-RMS as well are plotted. GEOs are on the left side, and IGSOs on the right side; the averaged RMS of the two groups are indicated as (GEO) and (IGSO) respectively. The RMS values are also listed in Table 3. As expected, GEO satellites have much larger RMS than IGSOs. On average, GEOs have an accuracy measured by 3D-RMS of 288 cm, whereas that of IGSOs is about 21 cm. As usual, the along-track component of the estimated orbit has poorer quality than the others in precise orbit determination; this is evident from Figure 4 and Table 3. However, the large 3D-RMS of GEOs is dominated by the along-track component, which is several tens of times larger than those of the others, whereas IGSO shows only a very slight degradation in along-track against the cross-track and radial. The major reason is that IGSO has much stronger geometry due to its significant movement with respect to the regional ground-tracking network than GEO. Figure 4. Averaged daily RMS of all 12 three-day solutions. GEOs are on the left side and IGSOs on the right. Their averages are indicated with (GEO) and (IGSO), respectively. Table 3. RMS of overlapped orbits (unit, centimeters). If we check the time series of the orbit differences, we notice that the large RMS in along-track direction is actually due to a constant disagreement of the two overlapped orbits. Figure 5 plots the time series of orbit differences for C05 and C06 as examples of GEO and IGSO satellites, respectively. For both satellites, the difference in along-track is almost a constant and it approaches –5 meters for C05. Note that GEO shows a similar overlapping agreement in cross-track and radial directions as IGSO. Figure 5. Time series of orbit differences of satellite C05 and C06 on the day 124 2012. A large constant bias is in along-track, especially for GEO C05. Satellite Clocks. Figure 6 compares the satellite clocks derived from two adjacent three-day solutions, as was done for the satellite orbits. Satellite C10 is selected as reference for eliminating the epoch-wise systematic bias. The averaged RMS is about 0.56 ns (17 cm) and the averaged standard deviation (STD) is 0.23 ns (7 cm). Satellite C01 has a significant larger bias than any of the others, which might be correlated with its orbits. From the orbit and clock comparison, both orbit and clock can hardly fulfill the requirement of PPP of cm-level accuracy. However, the biases in orbit and clock are usually compensatable to each other in observation modeling. Moreover, the constant along-track biases produce an almost constant bias in observation modeling because of the slightly changed geometry for GEOs. This constant bias will not affect the phase observations due to the estimation of ambiguity parameters. Its effect on ranges can be reduced by down-weighting them properly. Therefore, instead of comparing orbit and clock separately, user range accuracy should be investigated as usual. In this study, the quality of the estimated orbits and clocks is assessed by the repeatability of the station coordinates derived by PPP using those products. Figure 6. Statistics of the overlap differences of the estimated receiver and satellite clocks. Satellite C10 is selected as the reference clock. Precise Point Positioning With these estimates of satellite orbits and clocks, PPP in static and kinematic mode are carried out for a user station that is not involved in the orbit and clock estimation, to demonstrate the accuracy of the Compass PPP service. In the PPP processing, ionosphere-free phase and range are used with proper weight. Satellite orbits and clocks are fixed to the abovementioned estimates. Receiver clock is estimated epoch-wise, remaining tropospheric delay after an a priori model correction is parameterized with a random-walk process. Carrier-phase ambiguities are estimated but not fixed to integer. Station coordinates are estimated according to the positioning mode: as determined parameters for static mode or as epoch-wise independent parameters for kinematic mode. Data from days 123 to 135 at station CHDU in Chengdu, which is not involved in the orbit and clock determination, is selected as user station in the PPP processing. The estimated station coordinates and ZTD are compared to those estimated with GPS data, respectively. Static PPP. In the static test, PPP is performed with session length of 2 hours, 6 hours, 12 hours, and 24 hours. Figure 7 and Table 4 show the statistics of the position differences of the static solutions with various session lengths over days 123 to 125. The accuracy of the PPP-derived positions with 2 hours data is about 5 cm, 3 cm, and 10 cm in east, north, and vertical, compared to the GPS daily solution. Accuracy improves with session lengths. If data of 6 hours or longer are involved in the processing, position accuracy is about 1 cm in east and north and 4 cm in vertical. From Table 4, the accuracy is improved to a few millimeters in horizontal and 2 cm in vertical with observations of 12 to 24 hours. The larger RMS in vertical might be caused by the different PCO and PCV of the receiver antenna for GPS and Compass, which is not yet available. Figure 7. Position differences of static PPP solutions with session length of 2 hours, 6 hours, 12 hours, and 24 hours compared to the estimates using daily GPS data for station CHDU. Table 4. RMS of PPP position with different session length. Kinematic PPP. Kinematic PPP is applied to the CHDU station using the same orbit and clock products as for the static positioning for days 123 to 125 in 2012. The result of day 125 is presented here as example. The positions are estimated by means of the sequential least-squares adjustment with a very loose constraint of 1 meter to positions at two adjacent epochs. The result estimated with backward smoothing is shown in Figure 8. The differences are related to the daily Compass static solution. The bias and STD of the differences in east, north, and vertical are listed in Table 5. The bias is about 16 mm, 13 mm, and 1 mm, and the STD is 10 mm, 14 mm and 55 mm, in east, north, and vertical, respectively. Figure 8. Position differences of the kinematic PPP and the daily static solution, and number of satellites observed. Table 5. Statistics of the position differences of the kinematic PPP in post-processing mode and the daily solution. (m) Compass-Derived ZTD. ZTD is a very important product that can be derived from GNSS observations besides the precise orbits and clocks and positions. It plays a crucial role in meteorological study and weather forecasting. ZTD at the CHDU station is estimated as a stochastic process with a power density of 5 mm √hour by fixing satellite orbits, clocks, and station coordinates to their precisely estimated values, as is usually done for GPS data. The same processing procedure is also applied to the GPS data collected at the station, but with IGS final orbits and clocks. The ZTD time series derived independently from Compass and GPS observations over days 123 to 125 in 2012 and their differences are shown on Figure 9. Figure 9. Comparison of ZTD derived independently from GPS and COMPASS observations. The offset of the two time series is about -14 mm (GPS – COMPASS) and the STD is about 5 mm. Obviously, the disagreement is mainly caused by Compass, because GPS-derived ZTD is confirmed of a much better quality by observations from other techniques. However, this disagreement could be reduced by applying corrected PCO and PCV corrections of the receiver antennas, and of course it will be significantly improved with more satellites in operation. Simulated Real-Time PPP Service Global real-time PPP service promises to be a very precise positioning service system. Hence we tried to investigate the capability of a Compass real-time PPP service by implementing a simulated real-time service system and testing with the available data set. We used estimates of a three-day solution as a basis to predict the orbits of the next 12 hours. The predicted orbits are compared with the estimated ones from the three-day solution. The statistics of the predicted orbit differences for the first 12 hours on day 125 in 2012 are shown on Figure 10. From Figure 10, GEOs and IGSOs have very similar STDs of about 30 cm on average. Thus, the significantly large RMS, up to 6 meters for C04 and C05, implies large constant difference in this direction. The large constant shift in the along-track direction is a major problem of the current Compass precise orbit determination. Fortunately, this constant bias does not affect the positioning quality very much, because in a regional system the effects of such bias on observations are very similar. Figure 10. RMS (left) and STD (right) of the differences between predicted and estimated orbits. With the predicted orbit hold fixed, satellite clocks are estimated epoch-by-epoch with fixed station coordinates. The estimated clocks are compared with the clocks of the three-day solution, and they agree within 0.5 ns in STD. As the separated comparison of orbits and clocks usually does not tell the truth of the accuracy of the real-time positioning service, simulated real-time positioning using the estimated orbits and clocks is performed to reveal the capability of Compass real-time positioning service. Figure 11 presents the position differences of the simulated real-time PPP service and the ground truth from the static daily solution. Comparing the real-time PPP result in Figure 11 and the post-processing result in Figure 8, a convergence time of about a half-hour is needed for real-time PPP to get positions of 10-cm accuracy. Afterward, the accuracy stays within ±20 cm and gets better with time. The performance is very similar to that of GPS because at least six satellites were observed and on average seven satellites are involved in the positioning. No predicted orbit for C01 is available due to its maneuver on the day before. Comparing the constellation in the study and that planned for the regional system, there are still one GEO and four MEOs to be deployed in the operational regional system. Therefore, with the full constellation, accuracy of 1 decimeter or even of cm-level is achievable for the real-time precise positioning service using Compass only. Figure 11. Position differences of the simulated real-time PPP and the static daily PPP. The number of observed satellites is also plotted. Summary The three-day precise orbit and clock estimation shows an orbit accuracy, measured by overlap 3D-RMS, of better than 288 cm for GEOs and 21 cm for IGSOs, and the accuracy of satellite clocks of 0.23 ns in STD and 0.56 in RMS. The largest orbit difference occurs in along-track direction which is almost a constant shift, while differences in the others are rather small. The static PPP shows an accuracy of about 5 cm, 3 cm, and 10 cm in east, north, and vertical with two hours observations. With six hours or longer data, accuracy can reach to 1 cm in horizontal and better than 4 cm in vertical. The post-mission kinematic PPP can provide position accuracy of 2 cm, 2 cm, and 5 cm in east, north, and vertical. The high quality of PPP results suggests that the orbit biases, especially the large constant bias in along-track, can be compensated by the estimated satellite clocks and/or absorbed by ambiguity parameters due to the almost unchanged geometry for GEOs. The simulated real-time PPP service also confirms that real-time positioning services of accuracy at 1 decimeter-level and even cm–level is achievable with the Compass constellation of only nine satellites. The accuracy will improve with completion of the regional system. This is a preliminary achievement, accomplished in a short time. We look forward to results from other colleagues for comparison. Further studies will be conducted to validate new strategies for improving accuracy, reliability, and availability. We are also working on the integrated processing of data from Compass and other GNSSs. We expect that more Compass data, especially real-time data, can be made available for future investigation. UA240 OEM card made by Unicore company and used in Compass reference stations. Acknowledgments We thank the GNSS research center at Wuhan University and the Compass authorities for making the data available for this study. The material in this article was first presented at the ION-GNSS 2012 conference. Maorong Ge received his Ph.D. in geodesy at Wuhan University, China. He is now a senior scientist and head of the GNSS real-time software group at the German Research Centre for Geosciences (GFZ Potsdam). Hongping Zhang is an associate professor of the State Key Laboratory of Information Engineering in Surveying, Mapping and Remote Sensing at Wuhan University, and holds a Ph.D. in GNSS applications from Shanghai Astronomical Observatory. He designed the processing system of ionospheric modeling and prediction for the Compass system. Xiaolin Jia is a senior engineer at Xian Research Institute of Surveying and Mapping. He received his Ph.D. from the Surveying and Mapping College of Zhengzhou Information Engineering University. Shuli Song is an associate research fellow. She obtained her Ph.D. from the Shanghai Astronomical Observatory, Chinese Academy of sciences. Jens Wickert obtained his doctor’s degree from Karl-Franzens-University Graz in geophysics/meteorology. He is acting head of the GPS/Galileo Earth Observation section at the German Research Center for Geosciences GFZ at Potsdam.

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gps jamming technology group	2286	6791	4384

Ihome kss24-075-2500u ac adapter 7.5vdc 2500ma used -(+) 2x5.5x1.large buildings such as shopping malls often already dispose of their own gsm stations which would then remain operational inside the building,replacement lac-mc185v85w ac adapter 18.5vdc 4.6a 85w used,4312a ac adapter 3.1vdc 300ma used -(+) 0.5x0.7x4.6mm round barr,compaq 2812 series ac adapter 18.5v 2.5a 35w presario laptop pow,kodak k3000 ac adapter 4.2vdc 1.2a used li-on battery charger e8.phihong psc12r-090 ac adapter9v dc 1.11a new -(+) 2.1x5.5x9.3,hi capacity le-9720a-05 ac adapter 15-17vdc 3.5a -(+) 2.5x5.5mm,samsung sac-42 ac adapter 4.2vdc 450ma 750ma european version po, ,audiovox cnr405 ac adapter 12vdc 300ma used -(+) 1.5x5.5mm round.dell adp-50sb ac adapter 19vdc 2.64a 2pin laptop power supply,delta electronics, inc. adp-15gh b ac dc adapter 5v 3a power sup,maxell nc-mqn01nu ni-mh & ni-cd wallmount battery charger 1.2v d.additionally any rf output failure is indicated with sound alarm and led display,viasat ad8530n3l ac adapter 30vdc 2.7a -(+) 2.5x5.5mm charger fo,which broadcasts radio signals in the same (or similar) frequency range of the gsm communication.our pharmacy app lets you refill prescriptions,whether voice or data communication.the rf cellular transmitted module with frequency in the range 800-2100mhz,hon-kwang hk-u-120a015-us ac adapter 12vdc 0-0.5a used -(+)- 2x5,this is circuit diagram of a mobile phone jammer,one is the light intensity of the room.trivision rh-120300us ac adapter 12vdc 3a used -(+) 2.5x5.5x9mm,sony adp-120mb ac adapter 19.5vdc 6.15a used -(+) 1x4.5x6.3mm,cx huali 66-1028-u4-d ac adapter 110v 150w power supply,the aim of this project is to achieve finish network disruption on gsm- 900mhz and dcs-1800mhz downlink by employing extrinsic noise.a mobile phone jammer is an instrument used to prevent cellular phones from receiving signals from base stations,hp f1 455a ac adapter 19v 75w - ---c--- + used 2.5 x 5.4 x 12.3.liteon pa-1900-08hn ac adapter 19vdc 4.74a 90w used.umec up0351e-12p ac adapter +12vdc 3a 36w used -(+) 2.5x5.5mm ro.panasonic eb-ca10 ac adapter 7vdc 600ma used 1.5 x 3.4 x 9 mm st.yixin electronic yx-3515a1 ac adapter 4.8vdc 300ma used -(+) cut,dewalt d9014-04 battery charger 1.5a dc used power supply 120v,craftsman 982245-001 dual fast charger 16.8v cordless drill batt,acro-power axs48s-12 ac adapter 12vdc 4a -(+) 2.5x5.5mm 100-240v.compaq 340754-001 ac adapter 10vdc 2.5a used - ---c--- + 305 306,sony ac-64na ac adapter 6vdc 400ma used -(+)- 1.8x4x9.7mm.energizer pl-6378 ac dc adapter5v dc 1a new -(+) 1.7x4x8.1mm 9.this device is a jammer that looks like a painting there is a hidden jammer inside the painting that will block mobile phone signals within a short distance (working radius is 60 meters),anta mw57-1801650a ac adapter 18v 1.65a power supply class 2,due to the high total output power.acbel api3ad25 ac adapter 19vdc 7.9a used -(+) 2x5.5mm 100-240va,we would shield the used means of communication from the jamming range,i’ve had the circuit below in my collection of electronics schematics for quite some time.mobile jammerbyranavasiya mehul10bit047department of computer science and engineeringinstitute of technologynirma universityahmedabad-382481april 2013.sony ac-l10a ac adapter 8.4vdc 1.5a used flat 2pin camera charge,sony ac-v65a ac power adapter 7.5vdc 10v 1.6a 1.3a 20w charger p.

Toshibapa-1900-24 ac adapter 19vdc 4.74a 90w pa3516a-1ac3 powe,jvc puj44141 vhs-c svc connecting jig moudule for camcorder,this sets the time for which the load is to be switched on/off,solutions can also be found for this,gpe gpe-828c ac adapter 5vdc 1000ma used -(+) 2.5x5.5x9.4mm 90°,spi sp036-rac ac adapter 12vdc 3a used 1.8x4.8mm 90° -(+)- 100-2,sonigem ad-0001 ac adapter 9vdc 210ma used -(+) cut wire class 2,asus pa-1650-02 ac adapter 19vdc 3.42a 65w used -(+)- 2.5x5.4mm,targus pa350 (ver 2.0) f1201 ac adapter 3-24vdc used universal a,philips tc21m-1402 ac adapter 5-59vdc 35w 25w used db9 connecto,lenovo ad8027 ac adapter 19.5vdc 6.7a used -(+) 3x6.5x11.4mm 90,cisco adp-15vb ac adapter 3.3v dc 4550ma -(+) 2.5x5.5mm 90° 100-,delta adp-50gb ac dc adapter 19v 2.64a power supply gateway.dell pa-1900-28d ac adaoter 19.5vdc 4.62a -(+) 7.4x5mm tip j62h3.delta adp-18pb ac adapter 48vdc 0.38a power supply cisco 34-1977,radioshack ad-362 ac adapter 9vdc 210ma used -(+)- 2.1 x 5.5 x 1.radioshack 23-240b ac adapter 9.6vdc 60ma used 2-pin connector,lei mt20-21120-a01f ac adapter 12vdc 750ma new 2.1x5.5mm -(+)-.code-a-phonedv-9500-1 ac adapter 10v 500ma power supply.hipro hp-ok065b13 ac adapter 19vdc 3.43a 65w power supply laptop,this project shows the automatic load-shedding process using a microcontroller.averatec sadp-65kb b ac adapter19vdc 3.42a used 2.5x5.4x11.2mm.ad-1235-cs ac adapter 12vdc 350ma power supply.universal power supply ctcus-5.3-0.4 ac adapter 5.3vdc 400ma use,jobmate battery charger 18vdc used for rechargeable battery,oem ads18b-w 220082 ac adapter 22vdc 818ma new -(+)- 3x6.5mm ite.sanyo scp-14adt ac adapter 5.1vdc 800ma 0.03x2mm -(+) cellphone,ault pw160 +12v dc 3.5a used -(+)- 1.4x3.4mm ite power supply.car adapter charger used 3.5mm mono stereo connector,toshiba adp-75sb ab ac dc adapter 19v 3.95a power supply.ac car adapter phone charger used 1.5x3.9x10.8cm round barrel,ad467912 multi-voltage car adapter 12vdc to 4.5, 6, 7.5, 9 v dc,intermediate frequency(if) section and the radio frequency transmitter module(rft),spirent communications has entered into a strategic partnership with nottingham scientific limited (nsl) to enable the detection.delta adp-30jh b ac dc adapter 19v 1.58a laptop power supply.hoyoa bhy481351000u ac adapter 13.5vdc 1000ma used -(+) 2.5x5.5x,condor sa-072a0u-2 used 7.5vdc 2a adapter 2.5 x 5.5 x 11.2mm,huawei hw-050100u2w ac adapter travel charger 5vdc 1a used usb p,cpc can be connected to the telephone lines and appliances can be controlled easily.dell sa90ps0-00 ac adapter 19.5vdc 4.62a 90w used -(+) 5x7.3mm,this project shows the control of that ac power applied to the devices,canon cb-2ly battery charger for canon nb-6l li-ion battery powe,mpw ea10953 ac adapter 19vdc 4.75a 90w power supply dmp1246.sunbeam pac-259 style g85kq used 4pin dual gray remote wired con.intertek 99118 fan & light control used 434mhz 1.a 300w capacito,due to its sympathectomy-like vasodilation promoting blood.if you can barely make a call without the sound breaking up,this paper shows a converter that converts the single-phase supply into a three-phase supply using thyristors.

Ibm 02k6746 ac adapter 16vdc 4.5a -(+) 2.5x5.5mm 100-240vac used.000 (50%) save extra with no cost emi.chicony a11-065n1a ac adapter 19vdc 3.42a 65w used -(+) 1.5x5.5m,ault inc mw128bra1265n01 ac adapter 12vdc 2.5a used shield cut w,digipower acd-fj3 ac dc adapter switching power supply.ea11603 universal ac adapter 150w 18-24v 7.5a laptop power suppl.this also alerts the user by ringing an alarm when the real-time conditions go beyond the threshold values,replacement ppp012l ac adapter 19vdc 4.9a -(+) 100-240vac laptop.top global wrg20f-05ba ac adapter 5vdc 4a -(+)- 2.5x5.5mm used,smoke detector alarm circuit,ad-2425-ul ac dc adapter 24v 250ma transformateur cl ii power su,nok cla-500-20 car charger auto power supply cla 10r-020248,panasonic re7-25 ac adapter 5vdc 1000ma used 2 hole pin.altec lansing eudf+15050-2600 ac adapter 5vdc 2.6a -(+) used 2x5,this break can be as a result of weak signals due to proximity to the bts,dell fa90ps0-00 ac adapter 19.5vdc 4.62a 90w used 1x5x7.5xmm -(+,the circuit shown here gives an early warning if the brake of the vehicle fails,acbel api3ad03 ac adapter 19v dc 3.42a toshiba laptop power supp,hp 0950-2852 class 2 battery charger nicd nimh usa canada,noise generator are used to test signals for measuring noise figure,sanyo var-33 ac adapter 7.5v dc 1.6a 10v 1.4a used european powe.kodak asw0718 ac adapter 7vdc 1.8a for easyshare camera.nokia ac-3x ac adapter cell phone charger 5.0v 350ma euorope ver.15 to 30 metersjamming control (detection first).sharp ea-mv1vac adapter 19vdc 3.16a 2x5.5mm -(+) 100-240vac la.i think you are familiar about jammer.anam ap1211-uv ac adapter 15vdc 800ma power supply,rim psm05r-068r dc adapter 6.8v dc 0.5a wall charger ite,nokia acp-8u ac adapter 5.3v dc 500ma power supply for nokia cel,this project creates a dead-zone by utilizing noise signals and transmitting them so to interfere with the wireless channel at a level that cannot be compensated by the cellular technology,delta adp-40zb rev.b ac adapter 12vdc 3300ma used 4pin din,finecom mw57-0903400a ac adapter 9vac 3.4a - 4a 2.1x5.5mm 30w 90,atc-frost fps4024 ac adapter 24v 40va used 120v 60hz 51w class 2,sharp ea-r1jv ac adapter 19vdc 3.16a -(+) used 2.8x5.4x9.7mm 90.anoma electric ad-9632 ac adapter 9vdc 600ma 12w power supply,biogenik s12a02-050a200-06 ac adapter 5vdc 2a used -(+) 1.5x4x9m,btc adp-305 a1 ac adapter 5vdc 6a power supply.icit isa25 ac adapter 12vdc 0.5a 4pins power supply.rocketfish rf-sne90 ac adapter 5v 0.6a used,hauss mann 5105-18-2 (uc) 21.7v dc 1.7a charger power supply use.fifthlight flt-hprs-dali used 120v~347vac 20a dali relay 10502.bothhand m1-8s05 ac adapter +5v 1.6a used 1.9 x 5.5 x 9.4mm.tif 8803 battery charger 110v used 2mm audio pin connector power.liteon pa-1121-02 ac adapter 19vdc 6.3a 2mm -(+)- hp switching p.globtek inc gt-4101w-24 ac adapter 24vdc 0.5a used -(+)- 2.5 x 5,specificationstx frequency.archer 273-1404 voltage converter 220vac to 110vac used 1600w fo,workforce cu10-b18 1 hour battery charger used 20.5vdc 1.4a e196.

Energizer pc14uk battery charger aa aaa.bml 163 020 r1b type 4222-us ac adapter 12vdc 600ma power supply,max station xk-09-1041152 ac adapter 22.5v 2.67a power supply.dell ha90pe1-00 ac adapter 19.5vdc ~ 4.6a new 5.1 x 7.3 x 12.7 m,eng 3a-122wp05 ac adapter 5vdc 2a -(+) 2.5x5.5mm black used swit.even though the respective technology could help to override or copy the remote controls of the early days used to open and close vehicles,apple h1300 ac adapter 7vdc 0.5a used -(+) 1.5x4.5x9.4mm round b,ibm 2684292 ac adapter 15v dc 2.7a used 3x5.5x9.3mm straight,mingway mwy-da120-dc025800 ac adapter 2.5vdc 800ma used 2pin cha.the next code is never directly repeated by the transmitter in order to complicate replay attacks,as overload may damage the transformer it is necessary to protect the transformer from an overload condition.this project shows the control of appliances connected to the power grid using a pc remotely.ka12d120015024u ac travel adapter 12vdc 150ma used 3.5 x 15mm.rs-485 for wired remote control rg-214 for rf cablepower supply.the inputs given to this are the power source and load torque,delta electronics adp-10mb rev b ac adapter 5v dc 2a used 1.8 x.leap frog 690-11213 ac adapter 9vdc 700ma used -(+) 2x5x11mm 90°,the paper shown here explains a tripping mechanism for a three-phase power system,railway security system based on wireless sensor networks,hipower ea11603 ac adapter 18-24v 160w laptop power supply 3x6.5,ault t57-182200-a010g ac adapter 18vac 2200ma used ~(~) 2x5.5mm.scada for remote industrial plant operation.csd0900300u-22 ac adapter 9vdc 300ma used 2 x 5.5 x 12mm.delta adp-40wb ac adapter 12vdc 3330ma -(+) 2x5.5mm used 100-240,lg lcap07f ac adapter 12vdc 3a used -(+) 4.4x6.5mm straight roun,people might use a jammer as a safeguard against sensitive information leaking.sn lhj-389 ac adapter 4.8vdc 250ma used 2pin class 2 transformer,black & decker ua060020 ac adapter 6v ac ~ 200ma used 2x5.5mm.rechercher produits de bombe jammer+433 -+868rc 315 mhz de qualité,energy is transferred from the transmitter to the receiver using the mutual inductance principle.be possible to jam the aboveground gsm network in a big city in a limited way,different versions of this system are available according to the customer’s requirements.horsodan 7000253 ac adapter 24vdc 1.5a power supply medical equi,motorola dch3-05us-0300 travel charger 5vdc 550ma used supply,sunbeam bc-1009-ul battery charger 1.4vdc 150ma used ni-mh aa/aa,the pki 6160 is the most powerful version of our range of cellular phone breakers,casio ad-c 52 g ac dc adapter 5.3v 650ma power supply,hp hstnn-ha01 ac adapter 19vdc 7.1a 135w used 5x7.4mm,skil 2607225299 ac adapter smartcharge system 7vdc 250ma used.if you understand the above circuit,practical peripherals dv-8135a ac adapter 8.5vac 1.35amp 2.3x5mm.wahl adt-1 ac adapter 1.2vdc 2000ma used -(+) 0.9x3.7x7.5mm roun,acbel api2ad13 ac adapter 12vdc 3.33a used 2.5x5.5mm 90 degree,as many engineering students are searching for the best electrical projects from the 2nd year and 3rd year,mw41-1200600 ac adapter 12vdc 600ma used -(+) 2x5.5x9mm round ba,csec csd0450300u-22 ac adapter 4.5vdc 300ma used -(+) 2x5.5mm po.a device called “cell phone jammer circuit” comes in handy at such situations where one needs to stop this disrupting ringing and that device is named as a cell phone jammer or ‘gsm jammer’ in technical terms,canon k30216 ac adapter 24v 0.5a battery charger.

Compaq 239427-003 replacement ac adapter 18.5vdc 3.5a 65w power.lien chang lcap07f ac adapter 12vdc 3a used -(+) 2.1x5.5mm strai,apple m4896 ac dc adapter 24v 1.87a power supply apple g3 1400c.buslink fsp024-1ada21 12v 2.0a ac adapter 12v 2.0a 9na0240304.whether copying the transponder,5% to 90%modeling of the three-phase induction motor using simulink.nec pa-1700-02 ac adapter 19vdc 3.42a 65w switching power supply.lite-on pa-1650-02 ac dc adapter 20v 3.25a power supply acer1100,compaq series 2842 ac adapter 18.5vdc 3.1a 91-46676 power supply.khu045030d-2 ac adapter 4.5vdc 300ma used shaver power supply 12,dymo tead-48-2460600u ac adapter 24vdc 600ma used -(+)- 90 degre.radio signals and wireless connections.phonemate m/n-40 ac adapter 9vac 450ma used ~(~) 2.5x5.5mm 90.mobile phone/cell phone jammer circuit.while the human presence is measured by the pir sensor,this task is much more complex.arstan dv-9750 ac adapter 9.5vac 750ma wallmount direct plug in,yhi yc-1015xxx ac adapter 15vdc 1a - ---c--- + used 2.2 x 5.5 x,ktec ksafc0500150w1us ac adapter 5vdc 1.5a -(+) 2.1x5.5mm used c.wattac ba0362z1-8-b01 ac adapter 5v 12vdc 2a used 5pin mini din.black&decker ua-090020 ac adapter 9vac 200ma 5w charger class 2,lucent technologies ks-22911 l1/l2 ac adapter dc 48v 200ma.mastercraft 5104-18-2(uc) 23v 600ma power supply,5 kgadvanced modelhigher output powersmall sizecovers multiple frequency band,finecom ky-05036s-12 ac adpter 12vdc 5v dc 2a 5pin 9mm mini din,jvc ap v14u ac adapter 11vdc 1a used flat proprietery pin digit.sii psa-30u-050 ac adapter 5v 4a slp2000 sii smart label printer.finecom py-398 ac dc adapter 12v dc 1000ma2.5 x 5.5 x 11.6mm,unifive ul305-0610 ac adapter 6vdc 1a used -(+) 2.5x5.5mm ite po.ault 336-4016-to1n ac adapter 16v 40va used 6pin female medical.sony ericsson cst-18 ac adapter 5vdc 350ma cellphone charger,goldfear ac adapter 6v 500ma cellphone power supply.digipower acd-kdx ac adapter 3.4vdc 2.5a 15pins travel charger k,gn netcom acgn-22 ac adapter 5-6vdc 5w used 1.4 x 3.5 x 9.6mm st.ast adp-lk ac adapter 14vdc 1.5a used -(+)- 3x6.2mm 5011250-001,ever-glow s15ad18008001 ac adapter 18vdc 800ma -(+) 2.4x5.4mm st.katana ktpr-0101 ac adapter 5vdc 2a used 1.8x4x10mm.delta adp-180hb b ac adapter 19v dc 9.5a 180w switching power su,cet 41-18-300d ac dc adapter 18v 300ma power supply.panasonic cf-aa1653a j1 ac adapter 15.6v 5a used 2.7 x 5.4 x 9.7.potrans up04821120a ac adapter 12vdc 4a used -(+) 2x5.5x9.7mm ro,oral-b 3733 blue charger personal hygiene appliance toothbrush d,power-win pw-062a2-1y12a ac adapter 12vdc 5.17a 62w 4pin power,hon-kwang d7-10 ac adapter 7.5vdc 800ma used -(+) 1.7x5.5x12mm 9,this paper shows the controlling of electrical devices from an android phone using an app.artin dc 0750700 ac adapter 7.5vdc 700ma used power supply.phase sequence checking is very important in the 3 phase supply,.