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25 years on the path to multi-GNSS As Galileo, BeiDou, the Quasi-Zenith Satellite System, the Indian Regional Navigation Satellite System, and a variety of satellite-based augmentation systems join GPS and GLONASS, we help celebrate the coming 25th anniversary of the IGS as a truly multi-GNSS service. Editor’s note: Tables 1 and 3 in the print version of this article contain some incorrect values and missing designators. These errors have been corrected in the tables below. INNOVATION INSIGHTS by Richard Langley" width="173" height="210" srcset="https://www.gpsworld.com/wp-content/uploads/2012/04/Richard_Langley_headshot-173x210.jpg 173w, https://www.gpsworld.com/wp-content/uploads/2012/04/Richard_Langley_headshot.jpg 247w" sizes="(max-width: 173px) 100vw, 173px" />INNOVATION INSIGHTS by Richard Langley A QUARTER OF A CENTURY. That is how old the International GNSS Service (IGS) will be on Jan. 1, 2019. Conceived in the early 1990s as the International GPS Service for Geodynamics, the IGS continues to be the global standard bearer in providing receiver data, satellite orbit and clock products and other resources with the highest possible precision and accuracy. I remember the discussions that took place at international conferences about the need for such a service to provide the necessary data to advance our understanding of plate tectonics and other Earth-related phenomena. And this was well before GPS was officially declared fully operational in 1995. Remember, surveyors and geodesists were early adopters of GPS, making use of the technology even when only a partial GPS constellation was in place. The initial ideas for the IGS were laid out in an article published in GPS World in February 1993 entitled “Geodynamics: Tracking Satellites to Monitor Global Change.” But the services provided by the IGS extended well beyond the needs of the geodynamics research community, and so its name was shortened to just the International GPS Service. When GLONASS data and products became available, the name was further changed to its current moniker. One of the IGS’s notable achievements has been in advancing GNSS standards such as the Receiver-Independent Exchange format for receiver data and other information. The need for such a standard was clear even before the formation of the IGS, and it was documented in this column in the July 1994 issue of GPS World (“RINEX: The Receiver-Independent Exchange Format”). We continued to cover the evolution of the IGS over the years with, for example, the article “The International GNSS Service: Any Questions?” in the January 2007 issue of the magazine. And now, as Galileo, BeiDou, the Quasi-Zenith Satellite System, the Indian Regional Navigation Satellite System, and a variety of satellite-based augmentation systems join GPS and GLONASS, we help celebrate the coming 25th anniversary of the IGS as a truly multi-GNSS service. For going on 25 years, the International GNSS Service (IGS) has carried out its mission to advocate for, and provide, freely and openly available high-precision GNSS data, as well as derived operational data products, including satellite ephemerides, Earth rotation parameters, station coordinates and clock information. The IGS is a self-governed, voluntary federation of more than 300 contributing organizations from more than 100 countries around the world that collectively operate a global infrastructure of tracking stations, data centers and analysis centers to provide high-quality GNSS data products. The IGS products are provided openly for the benefit of all scientific, educational and commercial users. The IGS was first approved by its parent organization, the International Association of Geodesy (IAG), at a scientific meeting in Beijing, China, in August 1993. A quarter of a century later, the IGS community gathers for a workshop in Wuhan, China, this November to blaze a path to multi-GNSS through global collaboration. As a key component of the IAG’s global geodetic infrastructure, the IGS contributes to, extends and densifies the International Terrestrial Reference Frame (ITRF) of the International Earth Rotation and Reference Systems Service (IERS). The ITRF provides an accurate and consistent spatial frame for referencing positions at different times and in different locations around the world. In addition, IGS products enable the use of GNSS technologies for scientific applications such as the monitoring of solid Earth deformations, monitoring of Earth rotation and variations in the liquid Earth, and for scientific satellite orbit determinations, precise timing, ionosphere monitoring and water vapor measurements. IGS products are also considered critical by surveying, geomatics and geo-information users around the world, who rely on them on a daily basis to improve efficiency. Many applications that require reliable, accurate GNSS positioning in construction, agriculture, mining, exploration and transportation also benefit from the IGS. Community Collaboration At the heart of the IGS is a strong culture of sharing expertise, infrastructure and other resources for the purpose of encouraging global best practices for developing and delivering GNSS data and products all over the world. The collaborative nature of the IGS community leverages this diversity to integrate and make full use of all available GNSS technologies while promoting further innovation. More than 15,000 geodetic community members, some of whom comprise the backbone of the worldwide geodetic community, ensure that new technologies and systems are integrated into operational IGS products. Responsive to this innovation, the IGS develops and publicly releases standards, guidelines and conventions for the collection and use of GNSS data and the aforementioned products. The IGS strives to maintain an international federation with committed contributions from its members. Participation of individuals and organizations is often driven by user needs, a key characteristic of the inclusive culture within the IGS. Structure of the IGS The IGS consists of a central bureau, a global network of GNSS stations, data and analysis centers and a number of working groups all coordinated and overseen by a governing board. Central Bureau. The IGS Central Bureau (CB) functions as the secretariat of the IGS, providing continuous management and technology to sustain the multifaceted efforts of the IGS in perpetuity. The CB responds to the directives and decisions of the IGS governing board. It coordinates the IGS tracking network and operates the CB information system, the principal information portal where the IGS web, FTP and mail services are hosted (www.igs.org). The CB also represents the outward face of IGS to a diverse global user community, as well as the general public. The CB office is hosted at the California Institute of Technology/Jet Propulsion Laboratory in Pasadena, California. It is funded principally by the U.S. National Aeronautics and Space Administration (NASA), which generously contributes significant resources to advance the IGS. The IGS Network. The foundation of the IGS is a global network of more than 500 permanent and continuously operating stations of geodetic quality. These stations track signals from GPS, and increasingly also track signals from GLONASS, Galileo, BeiDou, the Quasi-Zenith Satellite System (QZSS), the Indian Regional Navigation Satellite System (IRNSS; also known as NavIC: Navigation with Indian Constellation), as well as space-based augmentation systems (SBAS). FIGURE 1 shows the recent state of the IGS network, indicating which stations are GPS only, GPS+GLONASS and multi-GNSS. FIGURE 2 is a photo of the IGS station ARHT at McMurdo Station, Antarctica. FIGURE 1 . The extent of the IGS network in 2017, showing the locations of stations monitoring just GPS, GPS and GLONASS, and GPS and GLONASS plus at least one other constellation. (Map: IGS) FIGURE 2. The consistency of the final GPS satellite orbit solutions from individual IGS analysis centers over the past 25 years. Each line depicts the solution of one analysis center, as compared to the weighted mean. COD: Center for Orbit Determination in Europe, EMR: Natural Resources Canada (formerly Energy, Mines and Resources Canada), ESA: European Space Agency, GFZ: GeoForschungsZentrum (German Research Centre for Geosciences); GRG: Centre National d’Etudes Spatiales (Groupe de Recherche de Géodésie Spatiale); JPL: Jet Propulsion Laboratory; MIT: Massachusetts Institute of Technology; NGS: National Geodetic Survey; SIO: Scripps Institution of Oceanography; IGR: IGS rapid product. (Graph courtesy of T. Herring, MIT and M. Moore, Geoscience Australia) The IGS is a critical component of the IAG’s Global Geodetic Observing System (GGOS), where it encourages and advocates for geometrical linkages of GNSS with other precise geodetic observing techniques, including satellite and lunar laser ranging, very long baseline interferometry and Doppler Orbitography and Radio Positioning Integrated by Satellite (DORIS). These linkages are fundamental to generating and accessing the ITRF. Data and Analysis Centers. Lots of hard work and dedication from IGS contributing organizations goes into the fabrication of IGS products, which start at the tracking network, then are collected by data centers and sent to analysis centers. At these centers, the data are compared and combined by the analysis center coordinator, and finally made available as IGS products. The IGS ensures high reliability by building redundancy into all of its components. In 1994, the IGS started with a network of about 40 stations; today, more than 500 receivers are included in the network. Critical to this activity are three categories of data center — operational, regional and global. At the ground level are operational data centers, which are in direct contact with IGS tracking sites and are responsible for such efforts as station monitoring and local archiving of GNSS tracking data. Operational data centers also validate, format, exchange and compress data. Regional data centers then collect tracking data from multiple operational data centers or stations, maintaining a local archive and providing online access to their data. The six global data centers receive, retrieve, archive and provide online access to tracking data from operational and regional data centers. These global data centers are also responsible for archiving and backing up IGS data and products, and maintaining a balance of data holdings across the IGS network. Analysis centers then receive and process tracking data from one or more data centers to generate IGS position, orbit and clock products. These products are produced in ultra-rapid, rapid, final and reprocessed versions for each analysis center. FIGURE 3 shows the huge improvement in the precision and accuracy of the final orbit submissions from the analysis centers over the past 25 years. Associate analysis centers produce specialized products, such as ionospheric information, tropospheric parameters or station coordinates and velocities for global and regional sub-networks. Regional and global network associate analysis centers complement this work as new capabilities and products emerge within the IGS. FIGURE 3. The antenna of IGS station ARHT at McMurdo Station, Antarctica. (Photo: IGS) Products from each analysis center are then combined into a single set of orbit and clock products by the analysis center coordinator, who monitors and assists the activities of analysis centers to ensure IGS standards for quality control, performance evaluation and analysis are successfully executed. The different analysis solutions ultimately verify the accuracy of IGS products, provide important redundancy in the case of errors in a particular solution, and average out modeling deficiencies of a particular software package. TABLE 1 shows the quality of service characteristics of the various IGS GPS and GLONASS orbit and clock products. Similarly, TABLES 2, 3 and 4 show the characteristics of the tracking station coordinates, Earth rotation parameters and atmospheric parameters. See www.igs.org/products for further details. TABLE 1. Quality of service characteristics for IGS orbit and clock products relating to GPS and GLONASS satellite orbits and satellite (sat.) and station (stn.) clocks as of 2017. (Data: IGS) TABLE 2. Quality of service characteristics for tracking station positions and velocities. (Data: IGS) TABLE 3. Quality of service characteristics for Earth rotation parameters: polar motion coordinates and rates of change and length-of-day (µas = microarcsecond). (Data: IGS) TABLE 4. Quality of service characteristics for atmospheric parameters: tropospheric zenith path delay and gradients and global grids of total electron content. (Data: IGS) Working Groups and Projects The IGS technical working groups (WGs) focus on topics of particular interest to the IGS, and consider various aspects of product generation and monitoring. The current working groups of the IGS span topics from antennas to tide gauges. Antenna Working Group. To increase the accuracy and consistency of IGS products the Antenna WG coordinates research on GNSS receiver and satellite antenna phase-center determination. The group manages official IGS receiver and satellite antenna files and their formats. Bias and Calibration Working Group. Different GNSS observables are subject to different satellite biases, which can degrade the IGS products. The Bias and Calibration WG coordinates research in the field of GNSS bias retrieval and monitoring. Clock Products Working Group. This group is responsible for aligning the combined IGS products to a highly precise timescale traceable to the world standard: Coordinated Universal Time (UTC). The IGS clock product coordinator forms the IGS timescales based on the clock solutions of IGS analysis centers, and IGS rapid and final products are aligned to these timescales. Data Center Working Group. The Data Center WG works to improve the provision of data and products from the operational, regional and global data centers, and recommends new data centers to the IGS governing board. Joint GNSS Monitoring and Assessment Working Group. This working group, in conjunction with a joint trial project with International Committee on GNSS’s (ICG) International GNSS Monitoring and Assessment (IGMA) Task Force, seeks to install, operate and further develop a GNSS Monitoring and Assessment Trial Project. GNSS Performance Monitoring ICG-IGS Joint Trial Project. The quality of navigation signals enables numerous applications, including worldwide time and frequency transfer and GPS meteorology. This project of the IGMA task force, coordinated in partnership with the IGS, focuses on monitoring GNSS constellation status. Ionosphere Working Group. This group produces global ionosphere maps of ionosphere vertical total electron content (TEC). A major task of the Ionosphere WG is to make available global ionosphere maps from the TEC maps produced independently by ionosphere associate analysis centers within the IGS. FIGURE 4 shows an example TEC map recomputed from data collected on March 17, 2015. The large values of TEC in the ionosphere’s equatorial anomaly are plainly visible. FIGURE 4. An example total electron content map recomputed from data collected on March 17, 2015. TECU: total electron content units. (Image: IGS) Multi-GNSS Working Group. This group supports the Multi-GNSS Experiment (MGEX) Project by facilitating estimation of intersystem biases and comparing the performance of multi-GNSS equipment and processing software. The MGEX Project was established to track, collate and analyze all available GNSS signals including those from BeiDou, Galileo and QZSS in addition to GPS and GLONASS. Reference Frame Working Group. This working group combines solutions from the IGS analysis centers to form the IGS station positions and velocity products, and Earth rotation parameters for inclusion in the IGS realization of ITRF. A new reference frame, called IGS14, was adopted on Jan. 29, 2017 (GPS Week 1934). At the same time, an updated set of satellite and ground antenna calibrations, igs14.atx, was implemented. Real-Time Working Group. The Real-Time WG supports the development and integration of real-time technologies, standards and infrastructure to produce high-accuracy IGS products in real time. The group operates the IGS Real-Time Service (RTS) to support precise point positioning (PPP) at global scales, in real time. RINEX Working Group. The RINEX-WG jointly manages the Receiver-Independent Exchange (RINEX) format with the Radio Technical Commission for Maritime Services Special Committee 104 (RTCM-SC104). RINEX has been widely adopted as an industry standard for archiving and exchanging GNSS observations, and newer versions support multiple GNSS constellations. Recently, the IGS governing board agreed to adopt the official RINEX V3.04 format, handling the ability for nine-character station ID and fixing the definition of GNSS reference time scales. Space Vehicle Orbit Dynamics Working Group. This group brings together IGS groups working on orbit dynamics and attitude modeling of spacecraft. This work includes the development of force and attitude models for new GNSS constellations to fully exploit all new signals with the highest possible accuracy. Troposphere Working Group. The Troposphere WG supports development of IGS troposphere products by combining troposphere solutions from individual analysis centers to improve the accuracy of PPP solutions. The goal of the Troposphere WG is to improve the accuracy and usability of GNSS-derived troposphere estimates. Tide Gauge (TIGA) Working Group. When studying sea level changes, where the GPS height of the benchmark is used for defining an absolute sea-level datum, problems occur when correcting the time series for height changes of the benchmark. TIGA is a pilot study for establishing a service to analyze GPS data from stations at or near tide gauges in the IGS network to support accurate measurement of sea-level change across the globe. A Multi-GNSS IGS Network The development of a multi-GNSS sub-network within the greater IGS network, led by the MGEX Project, develops the IGS’s capability to operate with multiple GNSS constellations. It has 223 multi-GNSS-capable (GPS + GLONASS + at least one other constellation) stations. Also, the number of IGS stations capable of real-time data streaming in support of the IGS Real-Time Project has increased to 195. MGEX was founded in 2012 to build a network of GNSS tracking stations, characterize the space segment and user equipment, develop theory and data-processing tools, and generate data products for emerging satellite systems. The stations within its network contain a diverse assortment of receiver and antenna equipment, which are recognized and characterized by the IGS in equipment description files. Other than GPS and GLONASS, no combination process has yet been implemented within IGS for precise orbit and clock products of the other, newer, constellations. Despite this, cross-comparison among analysis centers, as well as with satellite laser ranging, has been used to assess the precision or accuracy for various products. The growing role of multi-GNSS within the IGS network was benchmarked by the transition of MGEX to official IGS project status in 2016. For the sake of consistency, and as a nod to its heritage, use of the acronym “MGEX” has been retained. Making Strides in Real Time Through the Real-Time Service (RTS), the IGS extends its capability to support applications requiring real-time access to IGS products. The RTS is a GNSS orbit and clock correction service that enables PPP and related applications, such as time synchronization and disaster monitoring, at worldwide scales. The RTS is based on the IGS global infrastructure of network stations, data centers and analysis centers that provide world-standard high-precision GNSS data products. The RTS is currently offered as a GPS-only operational service, but GLONASS is initially being offered as an experimental product for the development and testing of applications. GLONASS will be included within the service when the IGS is confident that a sufficient number of analysis centers can ensure solution reliability and availability. Other GNSS constellations will be added as they become available. Engagement with the United Nations The IGS engages with diverse organizations, outside of the immediate precise GNSS community, that have an interest in geodetic applications of GNSS. Notably, the IGS has supported the development of the Global Geodetic Reference Frame resolution, roadmap and implementation plan within the United Nations Global Geospatial Information Management (GGIM) Committee of Experts. The IGS also works with the United Nations Office for Outer Space Affairs (UNOOSA) International Committee on GNSS (ICG) to develop common understandings of the requirements for multiple system monitoring through the joint pilot project with the ICG’s IGMA subgroup. The IGS also co-chairs ICG Working Group D, which focuses on reference frames, timing and applications. A Multi-GNSS Future Though the accuracy of current IGS multi-GNSS products lags behind standard IGS products for GPS and GLONASS, multi-GNSS paves the way for complete exploitation of new signals and constellations in navigation, surveying, geodesy and remote sensing. IGS also looks externally to other techniques through its participation in the IAG’s GGOS, which has illuminated how satellite laser ranging observations to GNSS satellites improves our understanding of observational errors and thus drives further improvement of IGS position, clock and orbit products. As it enters its second quarter-century, the IGS is evolving into a truly multi-GNSS service. For 25 years, IGS data and products have been made openly available to all users for use without restriction, and continue to be offered free of cost or obligation. In turn, users are encouraged to participate within the IGS, or otherwise contribute to its advancement. Acknowledgements The authors gratefully acknowledge the contributions of the IGS governing board and associate members in the drafting of this article. Special thanks to Anna Riddell and Grant Hausler, who, along with Gary Johnston, have an extensive chapter on IGS in the Springer Handbook of Global Navigation Satellite Systems, published in 2017 by Springer (see Further Reading). This book chapter is the new recommended official citation for publications referencing IGS data, products and other resources. Allison Craddock a member of the Geodynamics and Space Geodesy Group in the Tracking Systems and Applications Section at the NASA Jet Propulsion Laboratory in Pasadena, California. She is the director of the IGS Central Bureau, manager of external relations for the International Association of Geodesy’s Global Geodetic Observing System, and staff member of the NASA Space Geodesy Program. Gary Johnston is the head of the National Positioning Infrastructure Branch at Geoscience Australia. Johnston is the chair of the IGS governing board and the co-chair of the Subcommittee on Geodesy under the United Nations Global Geospatial Information Management committee of experts. FURTHER READING GNSS Handbook Chapter on IGS “The International GNSS Service” by G. Johnston, A. Riddell and G. Hausler, Chapter 33 in Springer Handbook of Global Navigation Satellite Systems, edited by P.J.G. Teunissen and O. Montenbruck, published by Springer International Publishing AG, Cham, Switzerland, 2017. IGS: Past, Present and Future International GNSS Service Strategic Plan 2017, edited by the IGS Central Bureau. International GNSS Service Technical Report 2017 (IGS Annual Report), edited by A. Villiger and R. Dach, published by IGS Central Bureau and University of Bern, Bern Open Publishing, Bern, Switzerland, 2018, doi: 10.7892/boris.116377. Includes reports from analysis centers, data centers and working groups. “The International GNSS Service: Any Questions?” by A.W. Moore in GPS World, Vol. 18, No. 1, January 2007, pp. 58–64. “Geodynamics: Tracking Satellites to Monitor Global Change” by G. Beutler, P. Morgan and R.E. Neilan in GPS World, Vol. 4, No. 2, February 1993, pp. 40–46. IGS Multi-GNSS Experiment IGS White Paper on Satellite and Operations Information for Generation of Precise GNSS Orbit and Clock Products (2017) by O. Montenbruck on behalf of the IGS Multi-GNSS Working Group. “The Multi-GNSS Experiment (MGEX) of the International GNSS Service (IGS) – Achievements, Prospects and Challenges by O. Montenbruck. P. Steigenberger, L. Prange, Z. Deng, Q. Zhao, F. Perosanz, I. Romero, C. Noll, A. Stürze, G. Weber, R. Schmid, K. MacLeod and S. Schaer in Advances in Space Research, Vol. 59, No. 7, April 1, 2017, pp. 1671–1697, doi: 10.1016/j.asr.2017.01.011. “IGS-MGEX: Preparing the Ground for Multi-Constellation GNSS Science” by O. Montenbruck P. Steigenberger, R. Khachikyan, G. Weber, R.B. Langley, L. Mervart and U. Hugentobler in Inside GNSS, Vol. 9, No. 1, January/February 2014, pp. 42–49. “Getting a Grip on Multi-GNSS: The International GNSS Service MGEX Campaign” by O. Montenbruck, C. Rizos, R. Weber, G. Weber, R. Neilan and U. Hugentobler in GPS World, Vol. 24, No. 7, July 2013, pp. 44–49. International GNSS Monitoring and Assessment “The International GNSS Monitoring and Assessment Service in a Multi-System Environment” by E.N.J. Ada, M. Bilal, G. Agbaje, O.R. Kunle, O.A. Alexander, O. Okibe and O. Salu in Inside GNSS, Vol. 11, No. 4, July/August 2016, pp. 48–54. IGS Real-Time Service “Coming Soon: The International GNSS Real-Time Service” by M. Caissy, L. Agrotis, G. Weber, M. Hernandez-Pajares and U. Hugentobler in GPS World, Vol. 23, No. 6, June 2012, pp. 52–58. RINEX “Data Formats” by O. Montenbruck and K. MacLeod, Annex A in Springer Handbook of Global Navigation Satellite Systems, edited by P.J.G. Teunissen and O. Montenbruck, published by Springer International Publishing AG, Cham, Switzerland, 2017.  RINEX: The Receiver Independent Exchange Format, Version 3.03, International GNSS Service and Radio Technical Commission for Maritime Services, 2015. “RINEX: The Receiver-Independent Exchange Format” by W. Gurtner in GPS World, Vol. 5, No. 7, July 1994, pp. 48–52.

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Acbel api1ad43 ac adapter 19v 4.74a laptop power supply,if you can barely make a call without the sound breaking up,condor ps146 100-0086-001b ac adapter 17vctac 0.7a used 4pin atx.philips hq 8000 ac adapter used 17vdc 400ma charger for shaver 1.xtend powerxtender airplane & auto adapter ac adapter.madcatz 8502 car adapter for sony psp,sceptre power amdd-30240-1000 ac adapter 24vdc 1a used -(+) 2x5.,tyco 610 ac adapter 25.5vdc 4.5va used 2pin hobby transformer po.remington pa600a ac dc adapter 12v dc 640ma power supply,cellet tcnok6101x ac adapter 4.5-9.5v 0.8a max used,good grounding rules are followed in the design.delta sadp-185af b 12vdc 15.4a 180w power supply apple a1144 17",mpw ea10953 ac adapter 19vdc 4.75a 90w power supply dmp1246,jvc aa-v40u ac adapter 7.2v 1.2a(charge) 6.3v 1.8a(vtr) used.when they are combined together.6.8vdc 350ma ac adapter used -(+) 2x5.5x11mm round barrel power,astec dps53 ac adapter 12vdc 5a -(+) 2x5.5mm power supply deskto. thepartneringinitiative ,the rating of electrical appliances determines the power utilized by them to work properly,ault 336-4016-to1n ac adapter 16v 40va used 6pin female medical,innergie adp-90rd aa ac adapter 19vdc 4.74a used -(+) 2pin femal,due to the high total output power,kyocera txtvl0c01 ac adapter 4.5v 1.5a travel phone charger 2235.chicony a10-018n3a ac adapter 36vdc 0.5a used 4.3 x 6 x 15.2 mm,austin adp-bk ac adapter 19v dc 1.6a used 2.5x5.5x12.6mm,ttx23073001 ac adapter 5v 1a wallmount charger i.t.e power suppl,techno earth 60w-12fo ac adapter 19vdc 3.16a used 2.6 x 5.4 x 11,vtech s004lu0750040(1)ac adapter 7.5vdc 3w -(+) 2.5x5.5mm round,aiphone ps-1820 ac adapter 18v 2.0a video intercom power supply,shenzhen sun-1200250b3 ac adapter 12vdc 2.5a used -(+) 2x5.5x12m,key/transponder duplicator 16 x 25 x 5 cmoperating voltage,toshiba pa-1121-04 ac dc adapter 19v 6.3a power supplyconditio.toshiba pa3241u-1aca ac adapter 15vdc 3a -(+) 3x6.5mm 100v-200va.delta eadp-20tb b ac adapter 5vdc 4a used -(+) 1.5x4mm motorola,macintosh m3037 ac adapter 24vdc 1.87a 45w powerbook mac laptop,dell adp-220ab b ac adapter 12v 18a switching power supply,canon cb-5l battery charger 18.4vdc 1.2a ds8101 for camecorder c,aurora 1442-200 ac adapter 4v 14vdc used power supply 120vac 12w.fj fj-sw1203000t ac adapter 12vdc 3000ma used -(+) shielded wire.palm plm05a-050 dock for palm pda m130, m500, m505, m515 and mor.verifone sm09003a ac adapter 9.3vdc 4a used -(+) 2x5.5x11mm 90°.duracell mallory bc734 battery charger 5.8vdc 18ma used plug in,this paper shows the real-time data acquisition of industrial data using scada.as overload may damage the transformer it is necessary to protect the transformer from an overload condition,st-c-075-18500380ct ac adapter 18.5vdc 2.7a 3.5a 3.8a used 1.6x4.apx sp7970 ac adapter 5vdc 5a 12v 2a -12v 0.8a 5pin din 13mm mal.ault ite sc200 ac adapter 5vdc 4a 12v 1a 5pin din 13.5mm medical,nexxtech e201955 usb cable wall car charger new open pack 5vdc 1,dell d12-1a-950 ac adapter 12vdc 1000ma used 2.5x5.5x10mm,fsp group inc fsp180-aaan1 ac adapter 24vdc 7.5a loto power supp.toshiba pa3378e-1aca ac adapter 15vdc 5a used 3 x 6.5 x 9.7 mm s.mastercraft 5104-18-2(uc) 23v 600ma power supply.basler electric be115230cab0020 ac adapter 5vac 30va a used.cyber acoustics u090100a30 ac adapter 9v ac 1000ma used 2.2 x 5..power supply unit was used to supply regulated and variable power to the circuitry during testing,palm plm05a-050 ac adapter 5vdc 1a power supply for palm pda do.350901002coa ac adapter 9vdc 100ma used -(+)-straight round ba,tenergy oh-1048a4001500u-t ac adapter 30vdc 1/1.5a used univers.philips 4120-0115-dc ac adapter 1.3v dc 1500ma used 2x5.4x20.3mm.

The unit is controlled via a wired remote control box which contains the master on/off switch,this task is much more complex.apd da-30i12 ac adapter 12vdc 2.5a power supply for external hdd,ault sw305 ac adapter 12vdc 0.8a -12v 0.4a +5v 2a 17w used power.ps06b-0601000u ac adapter used -(+) 6vdc 1000ma 2x5.5mm round ba.fisher-price na060x010u ac adapter 6vdc 100ma used 1.3x3.3mm.a mobile phone jammer or blocker is a device which deliberately transmits signals on the same radio frequencies as mobile phones,aps ad-555-1240 ac adapter 24vdc 2.3a used -(+)- 2.5x5.5mm power.chd dpx351314 ac adapter 6vdc 300ma used 2.5x5.5x10mm -(+),motorola spn5404aac adapter 5vdc 550ma used mini usb cellphone,nikon eh-69p ac adapter 5vdc 0.55a used usb i.t.e power supply 1.three circuits were shown here.hon-kwang d7-10 ac adapter 7.5vdc 800ma used -(+) 1.7x5.5x12mm 9,thinkpad 40y7649 ac adapter 20vdc 4.55a used -(+)- 5.5x7.9mm rou.braun 4729 ac adapter 250vac ~ 2.5a 2w class 2 power supply,ac adapter 9vdc 500ma - ---c--- + used 2.3 x 5.4 x 11 mm straigh,sony adp-708sr ac adapter 5vdc 1500ma used ite power supply.automatic changeover switch.vertex nc-77c two way radio charger with kw-1207 ac adapter 12v,there are many methods to do this,digipower tc-3000 1 hour universal battery charger.caere 099-0005-002 ac adapter 7.5dc 677ma power supply.specificationstx frequency.nexxtech 2731411 reverse voltage converter foriegn 40w 240v ac.sony ac-12v1 ac dc adapter 12v 2a laptop power supply.arac-12n ac adapter 12vdc 200ma used -(+) plug in class 2 power,foreen industries ltd. 28-d09-100 ac adapter 9v dc 100ma used 2.in the police apprehending those persons responsible for criminal activity in the community,kodak k4500 ni-mh rapid battery charger2.4vdc 1.2a wall plug-i,billion paw012a12us ac adapter 12vdc 1a power supply,casio ad-5mu ac adapter 9vdc 850ma 1.4x5.5mm 90 +(-) used 100-12.your own and desired communication is thus still possible without problems while unwanted emissions are jammed,when the temperature rises more than a threshold value this system automatically switches on the fan.with its highest output power of 8 watt,d-link cg2412-p ac adapter 12vdc 2a -(+) used 1.2x3.75mm europe,this paper shows the controlling of electrical devices from an android phone using an app,kingshen mobile network jammer 16 bands highp power 38w adjustable desktop jammer ₹29.ault 3com pw130 ac adapter 48vdc 420ma switching power supply.maisto dpx351326 ac adapter 12vdc 200ma used 2pin molex 120vac p,icm06-090 ac adapter 9vdc 0.5a 6w used -(+) 2x5.5x9mm round barr.fujitsu cp293662-01 ac adapter 19vdc 4.22a used 2.5 x 5.5 x 12mm.southwestern bell freedom phone 9a300u ac adapter 9vac 300ma,kenwood dc-4 mobile radio charger 12v dc,overload protection of transformer.elpac mi2818 ac adapter 18vdc 1.56a power supply medical equipm.canon k30216 ac adapter 24v 0.5a battery charger,compaq ppp012h ac adapter 18.5vdc 4.9a -(+)- 1.8x4.7mm,mascot type 9940 ac adapter 29.5v 1.3a used 3 step charger.ibm 02k6665 ac adapter 16vdc 4.5a use-(+) 2.5x5.5mm power supply.2wire gpusw0512000cd0s ac adapter 5.1vdc 2a desktop power supply,and fda indication for pediatric patients two years and older,fil 35-d09-300 ac adapter 9vdc 300ma power supply cut wire +(-).ad-2425-ul ac dc adapter 24v 250ma transformateur cl ii power su,cisco aa25-480l ac adapter 48vdc 0.38a -(+)- 100-240vac 2.5x5.5m,ryobi 1400656 1412001 14.4v charger 16v 2a for drill battery,ac car adapter phone charger used 1.5x3.9x10.8cm round barrel,ault a0377511 ac adapter 24v 16va direct plugin class2 trans pow,fujitsu fmv-ac311s ac adapter 16vdc 3.75a -(+) 4.4x6.5 tip fpcac.dataprobe k-12a 1420001 used 12amp switch power supplybrick di.

Sony ac-v35a ac adapter 10vdc 1.3a used battery charger digital.the program will be monitored to ensure it stays on,rf 315 mhz 433mhz and other signals.this paper shows the controlling of electrical devices from an android phone using an app,effectively disabling mobile phones within the range of the jammer,2100 to 2200 mhzoutput power.samsung atadm10ube ac adapter 5vdc 0.7a cellphone travel charger.motorola dch3-050us-0303 ac adapter 5vdc 550ma used usb mini ite.lei 41071oo3ct ac dc adapter 7.5v 1000ma class 2 power supply.rocketfish rf-bprac3 ac adapter 15-20v/5a 90w used,toshiba pa3049u-1aca ac adapter 15v 3a power supply laptop,the device looks like a loudspeaker so that it can be installed unobtrusively,bti ib-ps365 ac adapter 16v dc 3.4a battery tecnology inc generi,aspro c39280-z4-c477 ac adapter 9.5vac 300ma power supply class2.jhs-q34-adp ac adapter 5vdc 2a used 4 pin molex hdd power connec.apd ne-17b512 ac adapter 5v 1.2a 12v 1a power supply i.t.e,htc cru 6800 desktop cradle plus battery charger for xv ppc htc,nyko 86070-a50 charge base nyko xbox 360 rechargeable batteries.condor dv-51aat ac dc adapter 5v 1a power supply.microsoft 1040 used receiver 1.0a for media center pc with windo.benq acml-52 ac adapter 5vdc 1.5a 12vdc 1.9a used 3pin female du,d-link van90c-480b ac adapter 48vdc 1.45a -(+) 2x5.5mm 100-240va,lac-cp19v 120w ac adapter 19v 6.3a replacement power supply comp,sima spm-3camcorder battery charger with adapter,jvc ga-22au ac camera adapter 14v dc 1.1a power supply moudule f,samsung astec ad-8019 ac adapter 19vdc 4.2a used -(+) 0.7x3x5x9,toshiba sadp-65kb d ac adapter 19v dc 3.43a used 2.5x5.5x11.9mm,mw psu25a-14e ac adapter 5vdc 2.5a +/-15v used 5pin 13mm din mea.we just need some specifications for project planning.ibm adp-160ab ac adapter 12vdc 13.33a 6pin molex power supply.sunbeam gb-2 ac adapter 110-120vac used transformer shaver canad,delta adp-90cd db ac adapter 19vdc 4.74a used -(+)- 2x5.5x11mm.radio transmission on the shortwave band allows for long ranges and is thus also possible across borders,nec pa-1750-07 ac adapter 15vdc 5a adp80 power supply nec laptop,sony vgp-ac19v57 19.5v dc 2a used -(+)- 4.5x6mm 90° right angle,generation of hvdc from voltage multiplier using marx generator,.

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