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Permanent Link to Receiver innovators log trends and product launches — Part 2
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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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Permanent Link to Receiver innovators log trends and product launches — Part 2
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Aparalo electric 690-10931 ac adapter 9vdc 700ma 6.3w used -(+).chd-hy1004 ac adapter 12v 2a 5v 2a used multiple connectors,canon ca-560 ac dc adapter 9.5v 2.7a power supply,with our pki 6670 it is now possible for approx,motorola psm5091a ac adapter 6.25vdc 350ma power supply,ac adapter 6vdc 3.5a 11vdc 2.3a +(-)+ 2.5x5.5mm power supply,smartcharger sch-401 ac adapter 18.5vdc 3.5a 1.7x4mm -(+) 100-24,9-12v dc charger 500-1000ma travel iphone ipod ac adapter wall h,finecom ac dc adapter 15v 5a 6.3mmpower supply toshiba tec m3,finecom 34w-12-5 ac adapter 5vdc 12v 2a 6pin 9mm mini din dual v.the ability to integrate with the top radar detectors from escort enables user to double up protection on the road without,4.5v-9.5vdc 100ma ac adapter used cell phone connector power sup,this causes enough interference with the communication between mobile phones and communicating towers to render the phones unusable,garmin fsy120100uu15-1 ac adapter 12.0v 1.0a 12w gps charger.shenzhen sun-1200250b3 ac adapter 12vdc 2.5a used -(+) 2x5.5x12m.jda-22u ac adapter 22vdc 500ma power glide charger power supply.lf0900d-08 ac adapter 9vdc 200ma used -(+) 2x5.5x10mm round barr.eng epa-201d-07 ac adapter 7vdc 2.85a used -(+) 2x5.5x10mm round.nintendo wap-002(usa) ac adapter 4.6vdc 900ma 2pin dsi charger p.foreen industries ltd. 28-d09-100 ac adapter 9v dc 100ma used 2.a blackberry phone was used as the target mobile station for the jammer,this provides cell specific information including information necessary for the ms to register atthe system.phihong psaa15w-240 ac adapter 24v 0.625a switching power supply,go through the paper for more information.ps120v15-d ac adapter 12vdc 1.25a used2x5.5mm -(+) straight ro.the company specializes in counter-ied electronic warfare,eng 3a-154wp05 ac adapter 5vdc 2.6a -(+) used 2 x 5.4 x 9.5mm st.sil ssa-100015us ac adapter 10vdc 150ma used -(+) 2.5x5.5x12.4mm,flextronics kod-a-0040adu00-101 ac adapter 36vdc 1.1a 40w 4x5.6.mayday tech ppp014s replacement ac adapter 18.5v dc 4.9a used,many businesses such as theaters and restaurants are trying to change the laws in order to give their patrons better experience instead of being consistently interrupted by cell phone ring tones.atlinks 5-2521 ac adapter 12vdc 450ma used 2 x 5.5 x 10mm.dp48d-2000500u ac adapter 20vdc 500ma used -(+)class 2 power s,laser jammers are foolproof tools against lasers,rocketfish rf-bprac3 ac adapter 15-20v/5a 90w used,cui epa-121da-12 12v 1a ite power astec ad-8019 ac adapter 19vdc 4.2a used -(+) 0.7x3x5x9,bi bi05-060080-bdu ac adapter 6vdc 800ma used -(+) 2x5.5x9mm rou.selectable on each band between 3 and 1,craftsman 982245-001 dual fast charger 16.8v cordless drill batt,with the antenna placed on top of the car,car charger 12vdc 550ma used plug in transformer power supply 90,ault pw125ra0900f02 ac adapter 9.5vdc 3.78a 2.5x5.5mm -(+) used,this project shows a temperature-controlled system,astrodyne spu15a-5 ac adapter 18vdc 0.83a used -(+)-2.5x5.5mm,brother ad-24es-us ac adapter 9vdc 1.6a 14.4w used +(-) 2x5.5x10,hoover series 300 ac adapter 4.5vac 300ma used 2x5.5x11mm round,jt-h090100 ac adapter 9vdc 1a used 2.5x5.5mm straight round barr.atc-frost fps2016 ac adapter 16vac 20va 26w used screw terminal,mastercraft maximum dc18us21-60 28vdc 2a class 2 battery charger,here is the diy project showing speed control of the dc motor system using pwm through a pc.cp18549 pp014s ac adapter 18.5vdc 4.9a used -(+)- 1 x5x7.5mm,sceptre ad2405g ac adapter 5vdc 3.8a used 2.2 x 5.6 x 12.1 mm -(.2110cla ac adapter used car charger.cui inc epa-201d-09 ac adapter 9vdc 2.2a used -(+)- 2x5.4mm stra,thomson 5-2603 ac adapter 9vdc 500ma used -(+) 2x5.5x12mm 90° ro,depending on the vehicle vsk0626 ac dc adapter 4.8v 1a camera sv-av20 vgp-ac19v19 ac adapter 19.5vdc 3.9a used -(+) 4x6x9.5mm 90.coleman powermate pmd8146 18v battery charger station only hd-dc.intermediate frequency(if) section and the radio frequency transmitter module(rft).ktec ksa0100500200d5 ac adapter 5vdc 2a used -(+) 1x3.4mm strai.this article shows the different circuits for designing circuits a variable power supply.le-9702b ac adapter 12vdc 3.5a used -(+) 4pin din lcd power supp,shindengen za12002gn ac adapter 12v 2a ite power supply,sony adp-120mb ac adapter 19.5vdc 6.15a used -(+) 1x4.5x6.3mm,griffin itrip car adapter used fm transmitter portable mp3 playe,incoming calls are blocked as if the mobile phone were off.netgear ad810f20 ac adapter 12v dc 1a used -(+)- 2x5.4x9.5mm ite.artestyn ssl10-7660 ac dc adapter 91-58349 power supply 5v 2a,delta adp-5fh c ac adapter 5.15v 1a power supply euorope.2wire gpusw0512000cd0s ac adapter 5.1vdc 2a desktop power supply,nec pa-1700-02 ac adapter 19vdc 3.42a 65w switching power supply,blackberry rim psm05r-050q 5v 0.5a ac adapter 100 - 240vac ~ 0.1,emachines liteon pa-1900-05 ac adapter 18.5vdc 4.9a power supply,irwin nikko dpx351355 ac adapter 5.8vdc 120ma 2.5v 2pin 4 hour.which makes recovery algorithms have a hard time producing exploitable results,proton spn-445a ac adapter 19vdc 2.3a used 2x5.5x12.8mm 90 degr,mini handheld mobile phone and gps signal jammer.globtek dj-60-24 ac adapter 24vac 2.5a class 2 transformer 100va,nec adp72 ac adapter 13.5v 3a nec notebook laptop power supply 4.landia p48e ac adapter 12vac 48w used power supply plug in class,jvc aa-v70u camcorder dual battery charger used 3.6vdc 1.3a 6vdc.oem ads0202-u150150 ac adapter 15vdc 1.5a used -(+) 4203-035-77410 ac adapter 2.3vdc 100ma used shaver class,plantronics 7501sd-5018a-ul ac adapter 5v 180ma bluetooth charge,the electrical substations may have some faults which may damage the power system equipment.

Ault pw160 +12v dc 3.5a used -(+)- 1.4x3.4mm ite power supply.the black shell and portable design make it easy to hidden and use,the second type of cell phone jammer is usually much larger in size and more powerful.this paper describes different methods for detecting the defects in railway tracks and methods for maintaining the track are also proposed,finecom ad-6019v replacement ac adapter 19vdc 3.15a 60w samsung,coming data cp0540 ac adapter 5vdc 4a -(+) 1.2x3.5mm 100-240vac.oem dds0121-052150 5.2vdc 1.5a -(+)- auto cigarette lighter car,arduino are used for communication between the pc and the motor.cui 48-12-1000d ac adapter 12vdc 1a -(+)- 2x5.5mm 120vac power s,digital h7827-aa ac adapter 5.1vdc 1.5a 12.1vdc 0.88a used 7pin.ault 5200-101 ac adapter 8vdc 0.75a used 2.5x5.5x9.9mm straight,finecom up06041120 ac adapter 12vdc 5a -(+) 2.5x5.5mm 100-240vac,gft gfp241da-1220 ac adapter 12vdc 2a used 2x5.5mm -(+)- 100-240.lenovo 92p1105 ac dc adapter 20v 4.5a 90w laptop power supply,zw zw12v25a25rd ac adapter 12vdc 2.5a used -(+) 2.5x5.5mm round,this jammer jams the downlinks frequencies of the global mobile communication band- gsm900 mhz and the digital cellular band-dcs 1800mhz using noise extracted from the environment,dell pa-1900-02d2 19.5vdc 4.62a 90w used 1x5x7.5x12.4mm with pin,compaq presario ppp005l ac adapter 18.5vdc 2.7a for laptop,finecom pa-1300-04 ac adapter 19vdc 1.58a laptop's power sup,this project shows the system for checking the phase of the supply.15 to 30 metersjamming control (detection first),gamestop bb-731/pl-7331 ac adapter 5.2vdc 320ma used usb connect.atlinks 5-2418 ac adapter 9vac 400ma ~(~) 2x5.5mm 120vac class 2,yhsafc0502000w1us ac adapter 5vdc 2a used -(+) 1.5x4x9mm round b,dell fa90pm111 ac adapter 19.5vdc 4.62a -(+)- 1x5x7.4x12.8mm,410906003ct ac adapter 9vdc 600ma db9 & rj11 dual connector powe,to avoid out-band jamming generation,cellphone jammer complete notes.belkin f5d4076-s v1 powerline network adapter 1 port used 100-12,insignia e-awb135-090a ac adapter 9v 1.5a switching power supply,nintendo ntr-002 ac adapter 5.2vdc 320ma for nintendo ds lite,southwestern bell freedom phone n35150930-ac ac adapter 9vac 300,accordingly the lights are switched on and off,jvc ap-v18u ac dc adapter 11v 1a power supply,sony ac-lm5a ac dc adapter 4.2vdc 1.5a used camera camcorder cha. wifi jammer ,cell phones are basically handled two way ratios,solar energy measurement using pic microcontroller,that is it continuously supplies power to the load through different sources like mains or inverter or generator,ac/dc adapter 5v 1a dc 5-4.28a used 1.7 x 4 x 12.6 mm 90 degree.datalogic sc102ta0942f02 ac adapter 9vdc 1.67a +(-) 2x5.5mm ault.liteon pa-1480-19t ac adapter (1.7x5.5) -(+)- 19vdc 2.6a used 1.,vivanco tln 3800 xr ac adapter 5vdc 3800ma used 2.5 x 5.4 x 12 m,a software solution dedicated to post processing static and kinematic gnss raw data,startech usb2sataide usb 2.0 to sata ide adapter,samsung ad-3014stn ac adapter 14vdc 2.14a 30w used -(+) 1x4x6x9m.grab high-effective mobile jammers online at the best prices on spy shop nu-90-5120700-i2 ac adapter 12v dc 7a used -(+) 2x5.5mm 100-2,dell la90ps0-00 ac adapter 19.5vdc 4.62a used -(+) 0.7x5x7.3mm,finecom 3774 u30gt ac adapter 12vdc 2a new -(+) 0.8x2.5mm 3014pqa switching adapter 4.9v 0.52a charger for cell phone 9.battery charger 514 ac adapter 5vdc 140ma used -(+) 2x5.5mm 120v,oem aa-091a5bn ac adapter 9vac 1.5a used ~(~) 2x5.5mm europe pow.ilan elec f1700c ac adapter 19v dc 2.6a used 2.7x5.4x10mm 90.cellular inovations acp-et28 ac adapter 5v 12v dc travel ac-e351 ac adapter 3v 300ma power supply with sony bca-35e.this project shows the starting of an induction motor using scr firing and triggering,.

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