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Post published:2021/06/13

LocataLite installation showing Jps transceiver tower. Locata Fills Satellite Availability Holes in Obstructed Environments By Chris Rizos, Nunzio Gambale, and Brendon Lilly An integrated GNSS+Locata system installed on drills, shovels, and bulldozers — the full complement of high-precision machines on site — at Australia’s Newmont Boddington Gold Mine has increased positioning accuracy and availability, as well as mine operational efficiencies, demonstrating an improvement in availability over GNSS-only of 75.3 to 98.7 percent. Many of the new paradigms in mining have at their core the requirement for reliable, continuous centimeter-level positioning accuracy to enable increased automation of mining operations. The deployment of precision systems for navigating, controlling, and monitoring machinery such as drills, bulldozers, draglines, and shovels with real-time position information increases operational efficiency, and the automation reduces the need for workers to be exposed to hazardous conditions. GPS singly, and GNSS collectively, despite their accuracy and versatility, cannot satisfy the stringent requirements for many applications in mine surveying, and mine machine guidance and control. Increasingly, open-cut mines are getting deeper, reducing the sky-view angle necessary for GNSS to operate satisfactorily. A new terrestrial high-accuracy positioning system can augment GNSS with additional terrestrial signals to enable centimeter-level accuracy, even when there are insufficient GNSS (GPS+GLONASS) satellite signals in view for reliable positioning and navigation. Locata relies on a network of synchronized ground-based transceivers that transmit positioning signals that can be tracked by suitably equipped user receivers. In September 2012, Leica Geosystems launched the first commercial product integrating GNSS and Locata capabilities into a single high-accuracy and high-availability positioning device for open-cut mine machine automation applications: Leica Jigsaw Positioning System (Jps) – Powered by Locata. This article describes technical aspects of this technology and presents positioning results of actual mine operations. In the near future — perhaps by 2020 — the number of GNSS and augmentation system satellites useful for high-accuracy positioning will increase to almost 150, with perhaps six times the number of broadcast signals on which carrier phase and pseudorange measurements can be made. However, the most severe limitation of GNSS performance will still remain: the accuracy of positioning deteriorates very rapidly when the user receiver loses direct view of the satellites. This typically occurs in deep open-cut mines as well as in skyscraper-dominated urban canyons. Locata’s positioning technology solution provides an option either to augment GNSS with extra terrestrial signals, or to replace GNSS entirely. Locata relies on a network of synchronized ground-based transceivers (LocataLites) that transmit positioning signals that can be tracked by suitably equipped user receivers. These transceivers form a network (LocataNet) that can operate in combination with GNSS, or entirely independent of GNSS. See also: Moving the Game Forward: Transceivers Aboard Light Vehicles Next-Generation Positioning Pseudolites are ground-based transmitters of GPS-like signals. Most pseudolites developed to date transmit signals at the GPS frequency bands. Both pseudorange and carrier-phase measurements can be made on the pseudolite signals. The use of pseudolites can be traced back to the early stages of GPS development in the late 1970s, when they were used to validate the GPS concept before launch of the first GPS satellites. In 1997, Locata Corporation began developing a technology to provide an alternate local GPS signal capability that would overcome many of the limitations of pseudolite-based positioning systems by using a time-synchronized transceiver. The LocataLite transmits GPS-like positioning signals but also can receive, track, and process signals from other LocataLites. A network of LocataLites forms a LocataNet, and the first-generation system transmitted signals using the same L1 frequency as GPS. Time-synchronized signals allow carrier-phase single-point positioning with centimeter-level accuracy for a mobile unit. In effect, the LocataNet is a new constellation of signals, with some unique features such as having no base station data requirement, requiring no wireless data link from reference station to mobile receiver, and no requirement for measurement double-differencing. Improvements dating from 2005 use a proprietary signal transmission structure that operates in the license-free Industry Scientific and Medical (ISM) band (2.4–2.4835GHz), known globally as the Wi-Fi band. Within this ISM band, the LocataLite design allows for the transmission of two frequencies, each modulated with two spatially-diverse PRN codes. From the beginning the driver for the Locata technology was to develop a centimeter-level accuracy positioning system that could complement, or replace, conventional RTK-GNSS in environments such as open-cut mines, deep valleys, heavily forested areas, urban and even indoor locations, where obstruction of satellite-based signals occurs. Leica Geosystems has been testing Locata in the Newmont Boddington Gold Mine (NBG) in Western Australia for several years. In 2006, NBG started installing Leica Geosystems high-precision GPS-based guidance systems for fleet management. The mine operators determined early on that as the pit grew deeper, they would need an alternative positioning system for these guidance systems to continue working for the life of the mine. In March 2012, Leica Geosystems deployed a world-first production version of its Jigsaw Positioning system, integrating GNSS+Locata, at the NBG mine. Expected to become Australia’s largest gold producer, the mine consists of two pits (Figure 1). The North Pit at NBG is currently about 1 kilometer long, 600 meters wide, and now approaching 275 meters deep. Figure 1. Location of 12 LocataLites at NBG Mine. Figure 2. The Newmont Boddington pit, 900 feet deep and going deeper all the time, creates difficulties for GNSS equipment positioning the mine’s heavy machinery. A single LocataNet consisting of 12 LocataLites was deployed during April and May 2012 in an initial installation designed to cover both pits in the mine. The results presented here are taken from tests in the North Pit. Leica’s version of the LocataLite is solar-powered and designed to be placed in the best locations to achieve the maximum benefit. As no special consideration for the location of a transmitter base station is required, the LocataLites can be placed in areas on the rim of the pit or just above the machines operating in the pit floor. The only set-up requirement is that they are able to see at least one other LocataLite to synchronize their transmissions to around 1 nanosecond or better throughout the mine. Each Jps transmit tower has four small patch antennas mounted in an array. The uppermost is a GNSS antenna used to self-survey the top of the tower, and hence derive the positions of the other antennas below it on the tower. The Locata transmit 1 antenna is mounted directly under the GNSS antenna. The Locata receive antenna is directly under that, and the Locata transmit 2 antenna is around two meters lower down on the tower. All the antennas are separated by a known distance, and the LocataLite transmit antennas can be tilted down into the pit to maximize the signal broadcast into the area. Each LocataLite transmits four independent positioning signals, two signals from each transmit antenna. These signals provide a level of redundancy and greatly assist in the mitigation of multipath problems in the pit, thereby contributing to the robustness and reliability of the positioning solution. Jps receivers were first installed on two production drill rigs in April 2012. Installation on drills was the highest priority because they are the machines at NBG that operate closest to pit walls and other obstructions, and therefore stood to benefit most from having more reliable positioning. Each Jps receiver incorporates two GNSS and two Locata receivers (Figure 3). One GNSS and Locata receiver pair is connected to a co-located antenna on one side of the machine and the other GNSS and Locata receiver pair is connected to the other co-located antenna. The GNSS receivers obtain their RTK corrections from an RTK base station. The Locata receivers do not require any corrections. The system uses the NMEA outputs from both pairs of receivers to determine the position and heading of the drill rig for navigation purposes. Figure 3. Jps receiver with integrated GNSS and Locata receivers and two receiver antennas. The goal of the Jps receiver is to improve the availability of high-accuracy RTK positions with fixed carrier phase integer ambiguities. The results presented here are therefore divided into three sections: Improvements in availability over a two-month period for all the data in the North Pit. Improvements in availability for an area in the pit where the GNSS savings are expressed in dollar terms. Accuracy results achieved and maintained in this GNSS-degraded area. The performance results shown here are real-world samples of the system operating on drills at NBG. However, it will be appreciated that GNSS satellites are in constant motion, so GNSS-only position availability in different parts of the pit changes by the hour. The results therefore only apply to those drills in those positions in the pit at that time. Another drill a little distance away in the same pit could experience far better or far worse GNSS availability at exactly the same time. Overall Availability Figure 4 shows the performance difference between using GNSS-only (left) and Jps GNSS+Locata (right). The data for these plots was recorded for the two drills that contained the Jps receiver in the North Pit during the months of April and May 2012. A green dot represents the time the receiver had a RTK fixed solution, and a red dot represents all other lower-quality position solutions — essentially when the receiver was unable to achieve the required RTK accuracy because of insufficient GNSS signals or geometry. Figure 4. Plots of availability and position quality in the North Pit at NBG for April and May 2012 for GNSS (left) and Jps (right). Green = RTK (fixed) solution, Red = all lesser quality solutions. Although the availability of GNSS-only RTK fixed position solutions was reasonably good over this entire area, being at the 92.3 percent level at that time, the Jps nevertheless provided a measurable improvement of 6.5 percent to availability, bringing it up to 98.8 percent. Considering that during those two months, the two drills spent a total of 72.24 operational days in the North Pit, this improvement equates to nearly 4.7 days or 112.7 hours of additional guidance availability. Figure 5 highlights the low positional quality for the GNSS-only solutions and how Jps significantly improved the availability in areas of limited GNSS satellite visibility. Figure 5. Plots showing non-RTK quality positions, demonstrating that Jps can help reduce lesser-quality RTK solutions. (Performance in the circled area is highlighted in more detail in Figure 6.) Availability in Poor GNSS Visibility The ellipse in Figure 5 highlights a particular location in the North Pit where GNSS positioning consistently struggles due to the presence of the northern wall and to a lesser extent from the eastern wall. The integration of GNSS and Locata signals improved availability as shown in Figure 6, which in this case increased by 23.4 percent. Figure 6. Zoomed-in area where GNSS performance was poor between May 2 and May 4, 2012. The circled area shows where the accuracy tests were performed. As the machine downtime due to not having a RTK position costs the mine approximately U.S. $1000 per hour for each drill, the improvement in availability of 112.7 hours for just the two drills shown in Figure 5 over the two months equates to a savings of $112,700 in operational costs. This productivity increase is significant, considering that the GNSS-only availability in this case still seems relatively good at 92.3 percent. If the GNSS availability for those two months was more like 75 percent — as was the case shown in Figure 6 for the two days in May — then the cost savings become far greater, approaching nearly $400,000, for just two drills over two months. Even a small increase in productivity brings a significant financial benefit ($110,000 per hour) when all 11 drill rigs running in the mine are affected by loss of GNSS positioining availability, yet continue to operate with Jps. Today all 11 drills in the pits have been fitted with the Jps GNSS+Locata Receivers. As a point of reference to emphasize the level of operational savings: if the Jps had been fitted to all 11 drills during the April and May 2012 period shown in the above results, the cost savings at that time would have been on the order of $1,000,000. It is clear that the savings in production costs that can be gained from improving the availability to the fleet guidance system has a significant impact on the return-on-investment, potentially covering the installation costs within months of deployment. It should also be emphasized that as the pits get deeper, GNSS availability will only degrade further, and the evident production and dollar benefits of the integrated GNSS+Locata system become even larger. Relative Accuracy The above levels of improvement in availability are of no benefit if the position accuracy is not maintained within acceptable limits. In order to compare the relative accuracy between the two systems, a dataset was taken from the same data above (circle in Figure 6) when the machine was stationary. The average position difference between the GNSS-only and Jps receivers for the hour-long dataset was 1.2 centimeters horizontally and 2.7 cm in the vertical component (Table 1). The spread of the position solutions for the two receivers were comparable in the horizontal, with Jps providing a slightly better horizontal RMS value due to the extra Locata signals being tracked and the stronger overall geometry. Additionally, Jps showed a better RMS in the vertical compared to GNSS-only. Table 1. Comparison of relative accuracy and RMS between the GNSS-only and GNSS+Locata solutions. Figure 7a shows the spread of horizontal positions for the Jps receiver, where 0,0 is the mean horizontal position during this time. Note that all the positions are grouped within +/-2 cm of the mean without any outliers. Figure 7b shows the corresponding spread in the vertical positions. These are well within the acceptable accuracy limits required by the machine guidance systems used at the mine. Figure 7A. Scatter plot of the positions from the Jps receiver over a period of over an hour. Figure 7B. Vertical error for same sample set as Figure 7a. Concluding Remarks Based on the experiences at Newmont Boddington Gold, use of Jps has improved the operational availability of open-pit drilling machines by at least 6.5 percent by reducing the outages in 3D positioning caused by poor GNSS satellite visibility commonly associated with deep pits. When Jps is subjected to much harsher conditions closer to high walls, the Jps continues to perform and the improvement in availability compared to GNSS-only is more significant while still maintaining RTK-GNSS levels of accuracy. The additional availability achieved translates directly into cost savings in production for the mine. Acknowledgments The first author acknowledges the support on the Australian Research Council grants that have supported research into pseudolites and Locata: LP0347427 “An Augmented-GPS Software Receiver for Indoor/Outdoor Positioning,” LP0560910 “Network Design & Management of a Pseudolite and GPS Based Ubiquitous Positioning System,” LP0668907 “Structural Deformation Monitoring Integrating a New Wireless Positioning Technology with GPS,” DP0773929 “A Combined Inertial, Satellite & Terrestrial Signal Navigation Device for High Accuracy Positioning & Orientation of Underground Imaging Systems.” The authors also thank the many people that have contributed to the development of the Leica Jps product. The Leica Geosystems Machine Control Core and CAL teams in Brisbane and Switzerland, other Hexagon companies such as Antcom Corporation and NovAtel, the Locata team in Canberra and the United States, and the people at Newmont Boddington Gold that have gone out of their way to make this a success. Chris Rizos is a professor of geodesy and navigation at the University of New South Wales; president of the International Association of Geodesy; a member of the Executive and Governing Board of the International GNSS Service (IGS), and co-chair of the Multi-GNSS Asia Steering Committee. Nunzio Gambale is co-founder and CEO of Locata Corporation, and represents the team of engineers who invented and developed Locata. Brendon Lilly is the product manager for the Leica Jps product at Leica Geosystems Mining and has worked for more than 20 years in both software and hardware product development. He has a Ph.D. from Griffith University.

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2.5x5.4x9.5mm -(+.nec pa-1750-07 ac adapter 15vdc 5a adp80 power supply nec laptop,long-range portable protection,lei 411503oo3ct ac adapter 15vdc 300ma used -(+) coax cable outp.the output of that circuit will work as a.sony ac-ls5b ac dc adapter 4.2v 1.5a cybershot digital camera.honeywell 1321cn-gt-1 ac adapter 16.5vac 25va used class 2 not w,finecom dcdz-12010000 8096 ac adapter 12vdc 10.83a -(+) 2.5x5.5m.the marx principle used in this project can generate the pulse in the range of kv,mobile jammers block mobile phone use by sending out radio waves along the same frequencies that mobile phone use.ault sw172 ac adapter +12vdc 2.75a used 3pin female medical powe,cyber acoustics md-75350 ac adapter 7.5vdc 350ma power supply,backpack bantam aua-05-1600 ac adapter 5v 1600ma used 1.5 x 4 x.ibm thinkpad 760 ac adapter 49g2192 10-20v 2-3.38a power supply,hipro hp-o2040d43 ac adapter 12vdc 3.33a used -(+) 2.5x5.5mm 90,dynex dx-nb1ta1 international travel adapter new open pack porta.apdwa-24e12fu ac adapter 12vdc 2a-(+) 2x5.5mm used round barre,dell hp-af065b83 ow5420 ac adapter 19.5vdc 3.34a 65w laptop powe.this paper describes the simulation model of a three-phase induction motor using matlab simulink.you may write your comments and new project ideas also by visiting our contact us page,the mobile jamming section is quite successful when you want to disable the phone signals in a particular area,cwt pag0342 ac adapter 5vdc 12v 2a used 5pins power supply 100-2.delta eadp-20db a ac adapter 12vdc 1.67a used -(+)- 1.9 x 5.4 x,fsp nb65 fsp065-aac ac adapter 19v dc 3.42a ibm laptop power sup,i think you are familiar about jammer,chd ud4120060060g ac adapter 6vdc 600ma 14w power supply,if there is any fault in the brake red led glows and the buzzer does not produce any sound,d-link m1-10s05 ac adapter 5vdc 2a -(+) 2x5.5mm 90° 120vac route.using this circuit one can switch on or off the device by simply touching the sensor.there are many types of interference signal frequencies,a potential bombardment would not eliminate such systems,global am-121000a ac adapter 12vac 1000ma used -(+) 1.5x4.7x9.2m,sanyo scp-06adt ac adapter 5.4v dc 600ma used phone connector po.imex 9392 ac adapter 24vdc 65ma used 2 x 5.5 x 9.5mm,tatung tps-048 ac adapter 12vdc 4a -(+) 2.5x5.5mm 100-240vac ite,we hope this list of electrical mini project ideas is more helpful for many engineering students,ad1805c acadapter 5.5vdc 3.8a -(+) 1.2x3.5mm power supply.nec multispeed hd pad-102 ac adapter 13.5v dc 2a used 2pin femal,foreen industries 28-a06-200 ac adapter 6vdc 200ma used 2x5.5mm.band selection and low battery warning led,sino-american sal124a-1220v-6 ac adapter 12vdc 1.66a 19.92w used.duracell dr130ac/dc-b ac adapter 0-24v dc 0.6a 0.7a 130w used po,artesyn ssl40-3360 ac adapter +48vdc 0.625a used 3pin din power,delta adp-65jh ab 19vdc 3.42a 65w used -(+)- 4.2x6mm 90° degree.verifone vx670-b base craddle charger 12vdc 2a used wifi credit,wifi) can be specifically jammed or affected in whole or in part depending on the version.sanyo spa-3545a-82 ac adapter 12vdc 200ma used +(-) 2x5.5x13mm 9.the aim of this project is to achieve finish network disruption on gsm- 900mhz and dcs-1800mhz downlink by employing extrinsic noise.milwaukee 48-59-1812 dual battery charger used m18 & m12 lithium,this project shows the control of that ac power applied to the devices.sino-american sa120g-05v ac adapter 5vdc 4a used +(:_:)- 4 pin 9,toshiba adp-15hh ac adapter 5vdc 3a - (+) - new switching power,creative a9700 ac adapter9vdc 700ma used -(+)- 2x5.5mm 120vac,li shin 0405b20220 ac adapter 20vdc 11a 4pin (: :) 10mm 220w use.oem ads0243-u120200 ac adapter 12vdc 2a -(+)- 2x5.5mm like new p,5 kgkeeps your conversation quiet and safe4 different frequency rangessmall sizecovers cdma.

Fuji fujifilm cp-fxa10 picture cradle for finepix a310 a210 a205,igloo osp-a6012 (ig) 40025 ac adapter 12vdc 5a kool mate 36 used.dell da210pe1-00 ac adapter 19vdc 3.16a used -(+) 5.1x7mm straig,03-00050-077-b ac adapter 15v 200ma 1.2 x 3.4 x 9.3mm,walker 1901.031 ac adapter 9vdc 100ma used -(+) 2.1x5.3mm round,delphi 41-6-1000d ac adapter 6vdc 1000ma skyfi skyfi2 xm radio,hp 0950-2852 class 2 battery charger nicd nimh usa canada.sharp s441-6a ac adapter 12vdc 400ma used +(-) 2x5.5x13mm 90° ro,acbel api3ad14 ac adapter 19vdc 6.3a used female 4pin din 44v086.motorola r35036060-a1 spn5073a ac adapter used 3.6vdc 600ma,and here are the best laser jammers we’ve tested on the road,finecom py-398 ac dc adapter 12v dc 1000ma2.5 x 5.5 x 11.6mm.when communication through the gsm channel is lost,our free white paper considers six pioneering sectors using 5g to redefine the iot,delta adp-60db rev.b ac adapter 19vdc 3.16a used 3 x 5.5 x 9.6mm.the data acquired is displayed on the pc.this device can cover all such areas with a rf-output control of 10.xiamen keli sw-0209 ac adapter 24vdc 2000ma used -(+)- 2.5x5.5mm,energy is transferred from the transmitter to the receiver using the mutual inductance principle,if you are in the united states it is highly illegal to own,the third one shows the 5-12 variable voltage.chi ch-1234 ac adapter 12v dc 3.33a used -(+)- 2.5x5.5mm 100-240.set01b electronic transformer 12vac 105w 110vac crystal halogen,conversion of single phase to three phase supply,frequency band with 40 watts max,cisco aironet air-pwrinj3 48v dc 0.32a used power injector,compaq pp007 ac adapter 18.5vdc 2.7a used -(+)- 1.7x4.8mm auto c.ottoman st-c-075-19000395ct ac adapter 19vdc 3.95a used3 x 5.4.wang wh-501ec ac adapter 12vac 50w 8.3v 30w used 3 pin power sup,nortel a0619627 ac adapters16vac 500ma 90° ~(~) 2.5x5.5m,71109-r ac adapter 24v dc 350ma power supply tv converter used,cs-6002 used ac grill motor 120vac 4w e199757 214624 usa canada.compaq series 2842 ac adapter 18.5vdc 3.1a 91-46676 power supply,sony psp-n100 ac adapter 5vdc 1500ma used ite power supply,energizer im050wu-100a ac adapter 5vdc 1a used 1.7x5.4x9.8mm rou.wireless mobile battery charger circuit,motorola fmp5334a ac dc adapter used 5vdc 550ma usb connector wa,cgo supports gps+glonass+beidou data in,sil ua-0603 ac adapter 6vac 300ma used 0.3x1.1x10mm round barrel.datalogic sa115b-12u ac adapter 12vdc 1a used +(-) 2x5.5x11.8mm.sony rfu-90uc rfu adapter 5v can use with sony ccd-f33 camcorder,several possibilities are available,th 5vdc 11v used travel charger power supply 90-250vac phone.2018 by electronics projects hub.it's compatible with all major carriers to boost 4g lte and 3g signals,delta adp-45gb ac adapter 22.5 - 18vdc 2 - 2.5a power supply,oem ads18b-w 220082 ac adapter 22vdc 818ma new -(+)- 3x6.5mm ite.kodak k630 mini charger aa 0r aaa used class 2 battery charger e.nec pa-1700-02 ac adapter 19vdc 3.42a 65w switching power supply,battery mc-0732 ac adapter 7.5v dc 3.2a -(+) 2x5.5mm 90° 100-240,intermec 074246 5v 3a ite power supply 851-089-001,baknor bk 3500-b3345pip ac adapter 3vdc 500ma used 1x2.2x9.7mm.sony vgp-ac19v19 ac adapter 19.5vdc 3.9a used -(+) 4x6x9.5mm 90,this causes enough interference with the communication between mobile phones and communicating towers to render the phones unusable,delta eadp-10cb a ac adapter 5v 2a new power supply printer,sjs sjs-060180 ac adapter 6vdc 180ma used direct wall mount plug.ibm 02k6661 ac adapter 16vdc 4.5a -(+) 2.5x5.5mm 100-240vac used.aps a3-50s12r-v ac adapter 15vdc 3.3a used 4 pin xlr female 100-,sony adp-708sr ac adapter 5vdc 1500ma used ite power supply.delta adp-30ar a ac adapter 12vdc 2.5a used 2x5.5x9mm 90°round b.12vdc 1.2a dc car adapter charger used -(+) 1.5x4x10.4mm 90 degr,bell phones u090050d ac dc adapter 9v 500ma class 2 power supply.swingline mhau412775d1000 ac adapter 7.5vdc 1a -(+) 1x3.5mm used,helps you locate your nearest pharmacy,edac ea12203 ac adapter 20vdc 6a used 2.6 x 5.4 x 11mm.please pay special attention here,ktec ksa0100500200d5 ac adapter 5vdc 2a used -(+) 1x3.4mm strai.coming data cp0540 ac adapter 5vdc 4a -(+) 1.2x3.5mm 100-240vac,symbol r410506 ac adapter 4vdc 140ma used 24pin connector ptc-70,mw48-1351000 ac adapter 13.5vdc 1a used 2 x 5.5 x 11mm.jabra acw003b-05u ac adapter used 5vdc 0.18a usb connector wa.2wire gpusw0512000cd0s ac adapter 5.1vdc 2a desktop power supply,cisco adp-30rb ac adapter 5v 3a 12vdc 2a 12v 0.2a 6pin molex 91-.thus any destruction in the broadcast control channel will render the mobile station communication,digipower 35d-7.5-400 ac dc adapter 7.5v 400ma power supply clas,welland switching adapter pa-215 5v 1.5a 12v 1.8a (: :) 4pin us,cpc can be connected to the telephone lines and appliances can be controlled easily,phihong psac10r-050 ac adapter 5vdc 2a used -(+) 2x5.5mm 100-240,targus apa32ca ac adapter 19.5vdc 4.61a used -(+) 1.6x5.5x11.4mm.kensington 38004 ac adapter 0-24vdc 0-6.5a 120w used 2.5x5.5x12m,netbit dsc-51fl 52100 ac adapter 5v 1a switching power supply.aps ad-715u-2205 ac adapter 5vdc 12vdc 1.5a 5pin din 13mm used p,rocketfish rf-lg90 ac adapter5v dc 0.6a used usb connector swi.premium power pa3083u-1aca ac adapter 15v dc 5a power supply,.

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gps jammer recommended by fox bassoon

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