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Cover photo: Trimble Innovators Assemble In the second part of our receiver feature, top receiver manufacturers discuss what’s on the horizon for GNSS receivers: recent and upcoming innovations, combating spoofing and jamming, fusing GNSS with other sensors, and the impact of increasing accuracy both for professional surveyors and consumers. In January, we featured responses from NovAtel, Trimble, Unicore, Topcon, Hemisphere GNSS, CNC Navigation and Septentrio to questions about their recent and upcoming innovations in the design and manufacturing of GNSS receivers. We continue in this issue with responses to the same questions from Javad GNSS, Swift Navigation, Eos Positioning Systems, Tersus GNSS, TeleOrbit, Allystar Technology and NTLab. All GNSS receiver manufacturers agree that spoofing and intentional and unintentional jamming are serious challenges. Their approaches to dealing with these challenges differ, however, as they rely on different combinations of technologies on both their receivers (such as monitoring cycle slips and using analog-to-digital converters, correlators and notch filters) and their antennas (such as using array antennas), as well as the new Galileo authentication service. Photo: Tersus GNSS Many receiver manufacturers now routinely use optical, inertial and other sensors — which continue to drop in price and increase in performance — to supplement GNSS signals where they are degraded or denied, especially in the automotive market. Carrier phase positioning and correction services are increasingly improving the accuracy of survey stations and reducing their price. Meanwhile, submeter accuracy is spreading beyond surveying to other industries. Performance in challenging conditions also continues to improve, thanks largely to the increase in the number of GNSS constellations, available satellites and frequencies. (For a review of recent developments in antennas, see our companion article here.) On the consumer side, the introduction of multi-frequency GNSS receiver chips, the increased use of correction services, and, in a few countries, the deployment of thousands of additional base stations will continue to increase the location accuracy of cell phones and other consumer devices, enabling new applications. However, in these devices size and cost limitations make antenna performance particularly challenging. (See Part 1 here.) Javad GNSS Jamming and Spoofing. “We protect you against jammers and spoofers like no one else can,” said Javad Ashjaee, founder and CEO of Javad GNSS. “We use multiple techniques to detect spoofers, the most important being the use of digital signal processing to detect more than one peak. First, with 864 channels and about 130,000 Quick Acquisition Channels in our Triumph chip, we have resources to assign more than one channel to each satellite to find all signals that are transmitted with that GNSS PRN code. If we detect more than one reasonable and consistent correlation peak for any PRN code, we know that we are being spoofed and can then identify the spoofer signals and ignore the wrong peak.” An example of two peaks. (Chart: Javad GNSS) Ashjaee described additional techniques: The J-Shield filter blocks out-of-band interference. Sixteen 255th-order FIR anti-jam digital filters protect against static in-band interference, and 16 adaptive 80th-order digital filters protect against dynamic interference. Javad products measure the level of interference as a percentage of in-band noise above normal. The Triumph chip has a powerful spectrum analyzer. Each spectrum shows the power and the shape of the interfering signals and jammers. This is more powerful and more efficient than using a commercial spectrum analyzer to evaluate the environment. The chip also keeps a record of Automatic Gain Control, which is another indicator of external signals. A change in AGC can indicate interference. Deviation of SNR from the expected value is another important indicator of interference. “Usually there are over 100 signals available at any given time, and we need only four good signals to compute position. It is extremely unlikely that we can be spoofed without our knowledge.” Ashjaee concluded. “We will immediately recognize and take corrective actions.” Jamming and spoofing protection is available on all Javad GNSS receivers and OEM boards. Read more about Javad GNSS’s jamming and spoofing protection in the December 2019 issue. Sensor Fusion. “To support users in environments where GNSS RTK solutions are difficult or impossible to obtain,” Ashjaee said, “Javad GNSS has invented the J-Mate, which is a remotely controlled robotic EDM device and digital camera. GNSS RTK and optical can be seamlessly integrated using the J-Mate as the seventh RTK engine. Just set up a Triumph-3 on top of a J-Mate and a Triumph LS on top of a zebra rod, making the former pair the RTK base station and the latter pair the RTK rover.” Read more about Javad GNSS’s RTK and Optical United solution in the November 2019 issue. Swift Navigation Jamming and Spoofing. “Receivers have become more robust to intentional jamming by mimicking the jammers’ behavior to cancel it,” said Alex Pun, staff product manager for Swift. “Nevertheless, advanced jamming and spoofing mitigation often imply array antennas. A real evolution lies in considering these threats only in terms of the availability of the GNSS sensor, now part of a complete multi-sensor positioning engine such as Starling.” Sensor Fusion. IMUs, visual sensors and GNSS will aid each other in different types of environments and scenarios, explained Pun. “Sensors are becoming more affordable, and their performance increases with each new generation. Sensor fusion will be the glue that will bind them to provide a precise positioning solution.” Surveying. The combined use of carrier-phase positioning and correction services, such as Swift’s Skylark, will greatly improve accuracy and reduce the cost of survey stations, because they make their accuracy less dependent on the intrinsic performance of the receiver and the antenna, Pun said. “A global service eliminates the need for an individual base station.” Consumer Devices. “The introduction of dual-frequency GNSS receivers from chip manufacturers will help improve positioning in cell phones and other consumer devices,” Pun said. “These chips, coupled with a widely available correction service such as Skylark, will greatly improve their performance accuracy to sub-meter levels.” Other Challenges. Performance stability of the antenna and its characterization will become the main challenge to exploiting the new GNSS ASICs (application-specific integrated circuits) and correction services at their highest level of performance, Pun said. “A positioning engine can exploit this information to accelerate the convergence to the high-accuracy solution, and then improve its availability.” Eos Positioning Systems A surveyor uses the Arrow Gold receiver to map assets in Terrebonne, Quebec, Canada. (Photo: Eos Positioning) “The past three years have seen considerable innovations and trends in the GNSS industry,” said Jean-Yves Lauture, CTO of Eos Positioning. “Receivers are becoming increasingly affordable and the adoption of higher-accuracy (submeter, centimeter) positioning by other industries, outside of conventional surveying, is growing. Considering the now four usable GNSS constellations and the aggressive launches of Galileo and BeiDou satellites, the number of available satellites and the list of frequencies they use has considerably increased. “Although accuracy itself is not really improving, performance is — particularly in tougher conditions. It’s not uncommon for customers to use 30 to 35 satellites out of more than 40 in view using an Arrow Series GNSS receiver. The numbers are even higher in the Pacific regions, thanks to geostationary BeiDou satellites. This is, by far, more than double the number of satellites available with just GPS and GLONASS.” Consumer Devices. “It will be challenging for smartphones and consumer devices to achieve survey-grade accuracy in the next few years. They face certain limitations. For instance, there is a cost and physical size associated with using a high-end GNSS antenna with a minimum of ground plane to achieve these levels of accuracy. The Arrow Gold RTK GNSS receiver. (Photo: Eos Positioning) “Also, it is unlikely that the manufacturers of consumer devices will invest in developing the advanced algorithms needed for a high level of constant accuracy and performance. In order to fit into a smartphone, consumer-grade GNSS chipset manufacturers must drop the use of many available signals and frequencies to keep both size and power consumption to a minimum.” Allystar Technology Photo: Allystar Jamming and Spoofing. The GNSS chip in Allystar’s TAU1301 module supports eight adaptive notch filters to reduce the effects of GNSS jamming, explained Shi-Xian Yang, senior principal engineer in the company’s Baseband Algorithm Department. “It significantly improves the performance of GNSS tracking measurements, even in the presence of strong and fast-varying jamming signals.” Sensor Fusion. The TAU1310 integrates a six-axis micro-electromechanical system (MEMS) gyro, which makes its affordable for the mass market, Yang said. The Lenovo Z6. (Photo: Lenovo) Consumer Devices. In its Z6 smartphone, Lenovo has taken advantage of the great improvement in multipath mitigation provided by the L5 signal’s higher chip rate and the output of high quality raw data via the TAU1302’s HD8040 GNSS chipset to improve the accuracy experience in the consumer market, Yang explained. Additionally, he pointed out, cell phones and other consumer devices now enable developers to access the raw sensor data from such sensors as accelerometers and barometers to input into their fusion algorithms. Other Challenges. In the future, the TAU1310 could also support the L6 signal for PPP-RTK application. NTLab NTLab anti-jamming GNSS receiver. (Photo: NTLab) Jamming and Spoofing. The problem of jamming and spoofing worries customers, according to Konstantin Yuriev, lead GNSS engineer at NTLab. The combination of anti-jam and anti-spoofing is in greater demand because the anti-jam feature alone is becoming insufficient. Yuriev cited the European Union’s new requirements for the European Railway Traffic Management System (ERTMS), which makes anti-spoofing mandatory. The key issue today is “the solution to the problem of reducing the size and cost of anti-jam receivers, so that they become available to consumers on the civilian market. The key technology for this will be increasing the degree of integration of the component base, first creating a chipset for solving anti-jamming and anti-spoofing tasks, and then moving on to a single-chip solution. We have created a chipset and are ready to start work on the further integration into a single chip.” Sensor Fusion. The traditional task of integrating data from a GPS antenna and a MEMS sensor has been solved, Yuriev said, with many such solutions on the market. One task is to track the antenna’s tilt. “The antenna, GNSS receiver, and MEMS sensors should be located very closely to each other — if possible, on a single small board,” Yuriev said. “Here, again, the solution is to increase the degree of integration, up to placing the baseband processor on the same chip with the digital CMOS circuitry of the MEMS sensor.” Another application of MEMS is serving as the core of an inertial navigation system (INS), providing an auxiliary subsystem for detecting the presence of spoofing. “This is more of an algorithmic task,” Yuriev said, “because traditional coupling using recursive filters is not enough. It is necessary to ensure the independence of the INS subsystem from the GNSS solution, or their intelligent mutual cross-control.” Surveying. A major part of the cost of a survey-grade device, Yuriev pointed out, is for additional services, know-how, and other added values. There is market demand for a business model in which device price could go down while maintaining the main values for the customer. “This could be achieved if end-users tightly cooperate with hardware manufacturers, skipping third-party integrators. Alternatively, multiple third parties could compete, keeping the cost of the software low. One of the technical solutions for this is to provide software application programming interfaces (APIs) that will allow multiple third parties to offer application-level software for the same hardware. We call it the ‘open platform’ approach. One of our products implements this strategy.” Other Challenges. Despite some skeptics, Yuriev argued, new GNSS systems have been successful. “A good example is IRNSS (NavIC), with India’s population of 1.3 billion forming a potential market. Moreover, according to our studies, good coverage is provided not only in India’s territory. We are working on creating an economically affordable solution with support for the NavIC S-band. A new chip-scale packaged RFIC (radio-frequency integrated circuit) should minimize the size, consumption, and price of NavIC-oriented modules, while maintaining all the advantages of the S-band signal in areas close to the equator. This is our solution to the problem.” TeleOrbit GOOSE platform. (Photo: Fraunhofer IIS) GNSS Receiver Development Platform. The company’s GOOSE platform is a field-programmable gate array (FPGA)-based GNSS receiver, developed by Fraunhofer IIS, making it flexible in processing new or proprietary signals, according to Katrin Dietmayer, software development engineer at Fraunhofer IIS. “It comprises 60 hardware channels in real time and provides an open software interface for customer applications,” she explained. Jamming and Spoofing. “It grants deep access to the hardware interface, down to, for example, the correlation values. Additionally, anti-jamming functions (such as notch-filter or pulse-blanker) can be added and anti-spoofing algorithms are already implemented. Thanks to the open architecture, our customers can also implement these or other algorithms.” Sensor Fusion. Vector tracking in real time is already implemented on code base. Deep coupling with INS/IMU multi-sensor fusion — for example, with an odometer, ultra wideband or 5G — are possible and under development, Dietmayer said. Surveying. TeleOrbit provides GNSS-RTK using RTKLIB. “The implemented Open GNSS Receiver Protocol (OGRP) is fully documented with a parsing tool using CONVBIN from RTKLIB as RINEX converter,” Dietmayer explained. Consumer Devices. GOOSE is also used as the reference receiver in the ESA project Receiver Technologies for Future Mass Market (RT4FMM) devices. The project validates state-of-the-art dual-frequency mass-market receivers based on Broadcom BCM47755 and u-blox F9 and compares their performance against GOOSE E5AltBOC processing. Other Challenges. GOOSE already processes the new Galileo OS-NMA (Open Service – Navigation Messages Authentication), while implementing the new Galileo High Accuracy Service (HAS) is on the roadmap. “The combination of these new features will result in a robust and reliable high-accuracy position,” Dietmayer said. “For system testing, the intermediate frequency signals can be recorded, processed and replayed with the platform.” Tersus GNSS The Oscar. (Photo: Tersus GNSS) Jamming and Spoofing. Xiaohua Wen, founder and CEO, said his company has done much research and testing on jamming and spoofing. “We already implemented a high dynamic analog-to-digital converter to overcome jamming. To mitigate spoofing, we think that internet of things (IoT) devices can leverage cloud services. Alternatively, the new Galileo authentication service may serve the same function.” Sensor Fusion. Tersus GNSS makes an INS product, and its Oscar receiver contains an inertial measurement unit (IMU). “The sensor fusion hub is a very hot topic in the automobile industry,” Wen said. “We are quickly adapting our Oscar and INS product line for the creation of high definition maps and for indoor navigation. We think it’s still the major pain point for a crowded country such as China.” Surveying. As has been the case in many other industries, Wen said, the widespread adoption of GNSS technology and the increase in the number of players in the field has led to a drop in prices. “Tersus’ David and Oscar models are low cost but still perform well compared with Tier 1 players for professional survey machines using our own OEM GNSS board,” he said. Consumer Devices. The fact that a few vendors are providing dual-frequency chipsets in smartphones opens the door for consumer-grade sub-decimeter applications, Wen said. “But we think the antenna could be a big challenge for the small devices.” Other Challenges. “Mobile carriers are building thousands of base stations,” Wen said. “For example, Softbank in Japan completed 3,300 stations this year. China Mobile just issued a bid for a phase one project for 4,400 stations. We think mobile phone innovations for the new high-accuracy application may have some impacts in the coming years. We have been actively looking at some new GIS (geographic information systems) applications based on our in-house Nuwa platform.”
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50/60 hz permanent operationtotal output power,archer 23-131a ac adapter 8.1vdc 8ma used direct wall mount plug.a total of 160 w is available for covering each frequency between 800 and 2200 mhz in steps of max,with infrared the remote control turns on/off the power.with our pki 6640 you have an intelligent system at hand which is able to detect the transmitter to be jammed and which generates a jamming signal on exactly the same frequency,ibm adp-40bb ac adapter 20-10vdc 2-3.38a power supply,southwestern bell 9a200u-28 ac adapter 9vac 200ma 90° right angl,dve dsa-0421s-091 ac adapter used -(+)2.5x5.5 9.5vdc 4a round b.maisto dpx351326 ac adapter 12vdc 200ma used 2pin molex 120vac p.it’s also been a useful method for blocking signals to prevent terrorist attacks,12v car charger auto cigrate lighter 1.5x4mm round barrel.verifone vx670-b base craddle charger 12vdc 2a used wifi credit,specialix 00-100000 ac adapter 12v 0.3a rio rita power supply un,belkin f5d4076-s v1 powerline network adapter 1 port used 100-12,three phase fault analysis with auto reset for temporary fault and trip for permanent fault.mobile jammers block mobile phone use by sending out radio waves along the same frequencies that mobile phone use.or even our most popular model.liteon pa-1600-05 ac adapter 19v dc 3.16a 60w averatec adp68.canon cb-5l battery charger 18.4vdc 1.2a ds8101 for camecorder c.viewsonic api-208-98010 ac adapter 12vdc 3.6a -(+)- 1.7x4.8mm po.the gsm jammer circuit could block mobile phone signals which works on gsm1900 band,eng 3a-161wp05 ac adapter 5vdc 2.6a -(+) 2.5x5.5mm 100vac switch.outputs obtained are speed and electromagnetic torque.apple m3365 ac adapter 13.5vdc 1a -(+) 1x3.4x4.8mm tip 120vac 28.elpac power systems 2180 power supply used +8vdc 4a 32w shielded.dsc ptc1620u power transformer 16.5vac 20va used screw terminal.zenith 150-308 ac adapter 16.5vdc 2a used +(-) 2x5.5x9.6mm round.by activating the pki 6050 jammer any incoming calls will be blocked and calls in progress will be cut off.the third one shows the 5-12 variable voltage,a potential bombardment would not eliminate such systems,olympus c-7au ac adapter6.5v dc 2a used -(+) 1.7x5x9.4mm strai.mw psu25a-14e ac adapter 5vdc 2.5a +/-15v used 5pin 13mm din mea.duracell dr130ac/dc-b ac adapter 0-24v dc 0.6a 0.7a 130w used po.oem ads0243-u120200 ac adapter 12vdc 2a -(+)- 2x5.5mm like new p,black and decker etpca-180021u2 ac adapter 26vdc 210ma class 2,with its highest output power of 8 watt.apple m7332 yoyo ac adapter 24vdc 1.875a 3.5mm 45w with cable po.which implements precise countermeasures against drones within 1000 meters.sam-1800 ac adapter 4.5-9.5vdc 1000ma used 100-240v 200ma 47-63h,canon a20630n ac adapter 6vdc 300ma 5w ac-360 power supply.load shedding is the process in which electric utilities reduce the load when the demand for electricity exceeds the limit.eng epa-121da-05a ac adapter 5v 2a used -(+) 1.5x4mm round barre,sony adp-8ar a ac adapter 5vdc 1500ma used ite power supply,hp pa-1650-32ht ac adapter 18.5v 3.5a ppp009l-e series 65w 60842.plantronics a100-3 practica for single or multi line telephone u.redline tr 48 12v dc 2.2a power supply out 2000v 15ma for quest_,sony pcga-ac19v9 ac adapter 19.5vdc 7.7a used -(+) 3.1x6.5x9.4mm,realistic 20-189a ac adapter 5.8vdc 85ma used +(-) 2x5.5mm batte.amongst the wide range of products for sale choice.panasonic cf-aa1653a ac adapter 15.6vdc 5a ite power supply cf-1,coming data cp1230 ac adapter 12vdc 3a used -(+) 2x5.5mm round b.matewell 41-18-300 ac adapter 18vdc 300ma used -(+) 1x3.4x9.9mm.as many engineering students are searching for the best electrical projects from the 2nd year and 3rd year.
Battery charger for hitachi dvd cam dz-bx35a dz-acs3 ac new one,sony ericsson 316ams43001 ac adapter 5v dc 400ma -(+)- 0.5x2.5mm,oem ads0202-u150150 ac adapter 15vdc 1.5a used -(+) 1.7x4.8mm,vswr over protectionconnections,dell hp-af065b83 ac dc adapter 19.5v 3.34a laptop power supply,cwt pa-a060f ac adapter 12v 5a 60w power supply,delta adp-90sb bb ac adapter 19vdc 4.74a -(+) 2.5x5.5mm used 100,fixed installation and operation in cars is possible.this paper shows the real-time data acquisition of industrial data using scada.kodak k630 mini charger aa 0r aaa used class 2 battery charger e.pi-35-24d ac adapter 12vdc 200ma used -(+)- 2.1x5.3mm straight r,replacement sadp-65kb d ac adapter 19v 3.42a used 1.8x5.4x12mm 9,ibm 02k6718 thinkpad multiple battery charger ii charge quick mu.konica minolta a-10 ac-a10 ac adapter 9vdc 700ma -(+) 2x5.5mm 23.rocketfish rf-rzr90 ac adapter dc 5v 0.6a power supply charger.oem aa-091a5bn ac adapter 9vac 1.5a used ~(~) 2x5.5mm europe pow.2 w output powerwifi 2400 – 2485 mhz.pride hp8204b battery charger ac adapter 24vdc 5a 120w used 3pin,audiovox cnr405 ac adapter 12vdc 300ma used -(+) 1.5x5.5mm round.3ye gpu142400450waoo ac adapter 24vac 350ma used ~(~) 2pin din f,akii techa25b1-05mb ac adapter +5vdc 5a power supply.reverse polarity protection is fitted as standard,ppp003sd replacement ac adapter 18.5v 6.5a laptop power supply r,ault 336-4016-to1n ac adapter 16v 40va used 6pin female medical,optionally it can be supplied with a socket for an external antenna.swivel sweeper xr-dc080200 battery charger 7.5v 200ma used e2512,65w-dlj004 replacement ac adapter 19.5v 3.34a laptop power suppl.hp compaq adp-65hb b ac adapter 18.5vdc 3.5a -(+) 1.7x4.8mm used,this paper describes different methods for detecting the defects in railway tracks and methods for maintaining the track are also proposed.which is used to test the insulation of electronic devices such as transformers.motorola spn5404aac adapter 5vdc 550ma used mini usb cellphone.set01b electronic transformer 12vac 105w 110vac crystal halogen,dve dsa-0421s-12 1 42 ac adapter +12vdc 3.5a used -(+) 2.5x5.5x1.commodore dc-420 ac adapter 4.5vdc 200ma used -(+) phone jack po.this project uses a pir sensor and an ldr for efficient use of the lighting system,circuit-test ad-1280 ac adapter 12v 800ma 9pin medical equipment,philips 4120-0115-dc ac adapter 1.3v dc 1500ma used 2x5.4x20.3mm,shanghai dy121-120010100 ac adapter 12v dc 1a used -(+) cut wire.when shall jamming take place,au35-030-020 ac adapter 3vdc 200ma e144687 used 1x3.2mm round ba.d-link am-0751000d41 ac adapter 7.5vdc 1a used -(+) 2x5.5mm 90°,jt-h090100 ac adapter 9vdc 1a used 3 x 5.5 x 10 mm straight roun,pc-3010-dusn ac adapter 3vdc 1000ma used 90 degree right angle a.motorola am509 ac adapter 4.4v dc 1.1 a power supply spn4278d,nalin nld200120t1 ac adapter 12vdc 2a used -(+) 2x5.5mm round ba,sony pcga-acx1 ac adapter 19.5vdc 2.15a notebook power supply,dve dsa-0101f-05 up ac adapter 5v 2a power supply.astec sa35-3146 ac adapter 20vdc 1.75a power supply,410906003ct ac adapter 9vdc 600ma db9 & rj11 dual connector powe.mb132-075040 ac adapter 7.5vdc 400ma used molex 2 pin direct plu,exact coverage control furthermore is enhanced through the unique feature of the jammer.ching chen wde-101cdc ac dc adapter 12v 0.8a power supply.ibm 12j1441 ac adapter 16vdc 2.2a class 2 power supply 12j1442.
Please visit the highlighted article,toy transformer ud4818140040tc ac adapter 14vdc 400ma 5.6w used,rayovac rayltac8 ac adapter battery charger 15-24vdc 5a 90w max.by the time you hear the warning,friwo emc survivair 5200-73 ac adapter 7.5vdc 450ma used 3pin,radar detectors are passive and the laser gun can record your speed in less than ½,dve dsa-009f-05a ac adapter +5vdc 1.8a 9w switching adapter.high voltage generation by using cockcroft-walton multiplier.li shin 0226b19150 ac adapter 19vdc 7.89a -(+) 2.5x5.5mm 100-240,hp ppp009h 18.5vdc 3.5a 65w used-(+) 5x7.3mm comaq pavalion ro.tyco 610 ac adapter 25.5vdc 4.5va used 2pin hobby transformer po,artesyn scl25-7624 ac adapter 24vdc 1a 8pin power supply,cobra swd120010021u ac adapter 12vdc 100ma used 2 audio pin,nokia ac-3u ac adapter 5vdc 350ma power supply for cell phone,creative ppi-0970-ul ac dc adapter 9v 700ma ite power supply,he sad5012se ac adapter 12vdc 4.3a used -(+) 2x5.5x11.2mm round,sony vgp-ac19v10 ac dc adapter 19.5v 4.7a power supply adp-90yb,failure to comply with these rules may result in.hp 391173-001 ac dc adapter 19v 4.5a pa-1900-08h2 ppp014l-sa pow,this circuit uses a smoke detector and an lm358 comparator.ault p41120400a010g ac adapter 12v dc 400ma used 2.5 x 5.4 9.6mm.hp f1 455a ac adapter 19v 75w - ---c--- + used 2.5 x 5.4 x 12.3,chateau tc50c ac-converter 110vac to 220vac adapter 220 240v for,rf 315 mhz 433mhz and other signals,infinite ad30-5 ac adapter 5vdc 6a 3pin power supply.military/insurgency communication jamming,after years of campaigning for the dissolution of the long-gun registry.motorola fmp5202c ac adapter 5v 850ma cell phone power supply.cellular inovations acp-et28 ac adapter 5v 12v dc travel charger.dell aa20031 ac adapter 20vdc 3.5a 70w dell latitude c series.oem ad-0650 ac adapter 6vdc 500ma used -(+) 1.5x4mm round barrel,.
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