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GNSS and inertial navigation sensors are meeting the challenges of extreme conditions, from freezing Arctic ice to the edges of steaming volcanoes, from high-speed aircraft over cities to the subways under them. Even beyond, into deep space.
IN THE ARCTIC
Wave Buoys Help Study Arctic Climate Change
Where the edge of Arctic ice transitions to open water, towering seas are smashing sea ice into melting pieces, with far-flung effects on climate and nature. Over recent decades, the Arctic has warmed more than any other region, leading to a significant reduction in sea ice volume. The combination of increased ice-free area and more mobile ice cover has led to the emergence of a seasonal marginal ice zone (MIZ) in the Beaufort Sea, north of Prudhoe Bay, Alaska.
The United States Office of Naval Research conducted a five-year study of the MIZ, which included intense field work in the freezing Arctic sea. Here, the ice is vulnerable to ocean surface waves that form in the open water, resulting from strong winds and frequent storms. Also studied were in-ice waves, where ice and water clash. The goal was to understand how both factors impact the ice floe melting.
Autonomous ocean flux buoys integrate SBG Systems’ miniature inertial sensors. (Photo: SBG Systems)
The MIZ lies in the subarctic seas in winter and transitions into the interior of the Arctic Basin in summer. To investigate the MIZ’s dynamics, ONR engaged an international program of observations and simulations using several autonomous systems, including wave buoys. The wave buoys — officially designated the autonomous ocean flux buoys — integrate SBG Systems’ miniature inertial sensors.
The MIZ study comprised an international team of scientists from more than a dozen organizations.
Buoys for All Seasons. The program included 20 buoys deployed in the summer, and five in the winter, to quantify open ocean and in-ice wave characteristics and evolution. “We needed a very rapid and cost-effective solution to measuring directional wave spectra in the ocean,” said Martin Doble, oceanographer at the French UPMC School and member of the research program. “Time to deployment was very short, so an integrated solution, giving us good heave numbers straight out of the box, was essential. Delivery time of the units was also critical.”
Drilled into the ice, the summer buoys were powered with solar panels and equipped with SBG Systems’ IG-500A miniature attitude and heading reference system to detect both distant and near-wave effects on the local ice floe. Once the ice melted, the summer buoys continued to measure open ocean characteristics.
Five winter buoys were installed on the ice. These buoys were made of aluminum for better resistance and contained enough battery power to keep them going through the dark winter months. Every buoy also contained processing and control electronics, an SD card, a GPS receiver and an Iridium satellite modem and antennas to transmit the recorded data to its base station. Both summer and winter data from the buoys were used to quantify the wave attenuation rate.
Winter buoy installed on an ice floe. (Photo: SBG Systems)
By measuring the waves and ice, the buoys help scientists understand how waves are approaching and breaking up the sea ice. When winter approaches and ice begins to refreeze, the buoys help show how the waves interact with the ice as the temperatures change.
Calibration. The IG-500A inertial sensors were used for wave height and direction. IG-500A measures in real time the roll, pitch, heading (accurate to 0.35°) and heave (accurate to 10 centimeters). Every sensor is calibrated for bias, linearity, gain, misalignment, cross-axis and gyro-g from –40° to +85°C. The calibration is key to enabling the sensors to provide reliable data in the harsh environment.
Doble said the units were reliable, with no failures in the harsh Arctic conditions. They ran continuously for more than a year without requiring power cycling, and “the numbers look good, giving clear results.”
The data is helping researchers understand the physics that control sea ice breakup and melt in and around the ice edge. “We have this amazing picture of the ocean, atmosphere, and ice going from the fully frozen period in March to meltdown and breakup right through to freeze-up,” said Craig Lee of the University of Washington’s Applied Physics Laboratory.
The IG-500A sensors also delivered heave measurement, important for instrumented ocean buoys. During the project, SBG Systems released the Ellipse Series, and the new line replaced the IG-500 series. More accurate in attitude and more reliable (with an IP68 rating) for the same budget, the new miniature inertial sensors now provide a heave measurement that automatically adjusts to the wave period, resulting in higher performance.
Clear differences were measured between surface wave activity outside of the ice, and then moving into the ice, with huge attenuation as the waves enter the ice and die back quickly.
Current Arctic Program. Following the close of the MIZ project in 2015, the ONR launched a new project for 2016–2020, the Stratified Ocean Dynamics in the Arctic (SODA). SODA is also taking place in the Beaufort Sea, and is using the autonomous ocean flux buoys. The buoys are now equipped with SBG’s Ellipse-A sensors.
Why the Arctic Matters
“There’s no question that the Arctic sea ice extent is decreasing,” said Martin Jeffries, program officer for the ONR Arctic and Global Prediction Program. “Multiple sources of data — autonomous underwater gliders, ice-measuring buoys and satellite images of the marginal ice zone — were used to help understand why the ice is retreating.”
The implications for the U.S. Navy, and the world, are significant. If there were no sea ice in the Arctic at the end of summer, that would mean that the Arctic Ocean would, until the winter ice came in, be completely open — something unprecedented in living memory, Jeffries noted.
Naval leaders have made it clear that understanding a changing Arctic is essential for the Navy to be prepared to respond effectively to future needs.
“[T]he opening of the Arctic Ocean has important national security implications as well as significant impacts on the U.S. Navy’s required future capabilities,” said then Chief of Naval Operations Admiral Jonathan Greenert, in his introduction to the U.S. Navy Arctic Roadmap, 2014–2030, published in 2014. “The United States has a history of maritime homeland security and homeland defense concerns in the Arctic Region […] .”
In the period between 2007 and 2014, satellites recorded the eight lowest sea ice levels ever. A key goal of the MIZ and SODA programs is to use the new data collected to make better predictive computer models — ensuring safer operations for not only naval vessels, but also anticipated increased sea traffic by shipping and fishing industries; oil, gas and mining companies; and tourism operations.
Much of the data coming in to Arctic scientists is now from improved sensors, with greater ability to survive the harsh weather and ocean conditions.
Inside the Ellipse
Alexis Guinamard, chief technology officer of SBG Systems, described to GPS World the company’s most advanced sensor for extreme environments.
“Of course we have more precise sensors like Ekinox, Apogee or even Horizon, for ‘extreme’ precision. But for extreme environments, the more appropriate sensor line is the Ellipse series,” Guinamard said. “There are several key parameters that make them better for this kind of environment.”
Those features include a high-temperature calibration range, from –40°C to +85°C, which enables the sensors to operate at the same performance level in the most extreme temperature environments.
“While typical entry-level or industrial-grade sensors only provide a room temperature or basic temperature calibration, we have developed a calibration procedure used for both survey-grade and industrial-grade sensors using a precision two-axis rotary table with temperature chamber,” Guinamard said. “An advanced thermal modeling minimizes the calibration error over the full temperature range.”
Ellipse-D dual-antenna mini INS/GNSS. (Photo: SBG Systems)
The sensors work in highly dynamic and vibrating environments because their gyros operate well, changing position up to 900° per second. Similarly, their accelerometers can reach up to 40 g, with excellent behavior in vibrating environments. “We can typically install our sensors directly on the chassis of the vehicle, while lower grade sensors may require specific dampers that are complex to design and make it difficult to precisely align the sensor,” Guinamard said.
A GNSS interference-mitigation capability enables the sensors to perform in challenging GNSS environments.
With the Ellipse-D, high latitude operation is possible because it provides a dual-antenna heading that is insensitive to higher latitudes, Guinamard explained.
Saltwater-Proof. SBG Systems sensors typically have waterproof (IP68) enclosures that can deal with harsh conditions and sustain exposure to saltwater for a limited period of time. For long exposure to salt water, the company offers specific titanium enclosures. For instance, its Navsight series has a saltwater-proof inertial measurement unit.
Navsight marine solution. (Photo: SBG Systems)
The Navsight Marine Solution is a motion and navigation solution for hydrographers available as a motion reference unit (MRU), as an inertial navigation solution (INS) with embedded GNSS, and as an INS using a third-party GNSS receiver.
Navsight can be outfitted for demanding shallow- or deep-water environments to survey highly dense areas (bridges and buildings), as well as applications where only a single antenna can be used.
With the addition of the Horizon inertial measurement unit (IMU) to the Navsight line in January, which joined the Ekinox and Apogee IMUs, the line is suitable for large hydrographic vessels surveying harsh environments. The Horizon IMU is based on a closed-loop fiber-optic gyro (FOG) technology that enables ultra-low bias and noise levels, allowing robust and consistent performance.
Dust, noxious gas and loose rock near the summit makes volcanic surveying especially challenging. (Photo: Trimble)
AT VOLCANO’S EDGE
GNSS Tracks Magma on Mount Etna
Scientists seeking to better understand volcanoes are using GNSS to investigate one of the most active in the world.
Mount Etna, in eastern Sicily, Italy, has been erupting for hundreds of thousands of years. The constant activity makes it a popular tourist attraction — smoke often billows from the mountain and fiery lava spews down its sides.
Researchers flock to Mount Etna, too, to study the movement of magma — the hot fluid beneath the Earth’s surface from which rocks are formed when cooled.
To measure the vertical gradients of gravity on Mount Etna’s slopes and summit craters, geophysicists from Slovakia and Italy teamed up on a field campaign during which they used high-accuracy GNSS positioning with emphasis on accurate height measurements to collect gravimetry and topographic information.
The extreme environment and spotty cellular coverage on Mount Etna made using GNSS with real-time kinematic (RTK) or virtual reference station (VRS) a challenge. The geophysicists used the Trimble CenterPoint RTX correction service and Trimble R10 GNSS receivers to ensure reliable GNSS performance.
“On many points, especially the higher part of the volcano, Internet signals were poor or [there were] none at all,” said Juraj Papčo, a geodesist with the Earth Science Institute of the Slovak Academy of Sciences. “Only by using RTX were we able to collect real-time data. It performed well in higher elevations and difficult conditions.”
The project teams also used Trimble RTX to navigate to locations where they needed measurements. At each station, they collected static and real-time positions and later compared post-processed results with the real-time positions.
Dust, noxious gas and loose rock made approaching the summit especially challenging. Trimble RTX helped the Slovak-Italian team of geophysicists better understand volcanoes and anticipate volcanic events.
Researchers used high-accuracy GNSS positioning to collect gravimetry and topographic information. (Photo: Trimble)
Prisms affixed to the track enable measurement of change and structural movement. (Photo: Topcon)
UNDER A METROPOLIS
Harsh Construction Environment Monitored
Deep beneath Paris, work is underway to expand the Metro, the city’s rapid transit system. The Grand Paris Express project encompasses a 200-kilometer-long network of railway lines — mostly underground — that will link the suburbs to the city.
The contractor responsible for monitoring construction of the first stage of the project’s infrastructure, Cementys, is using more than 100 instruments from Topcon’s MS series of robotic total stations because they can withstand the harsh construction environment.
Monitoring structural movement across the network is critical; the goal is to protect the surrounding Parisian structures and the people who live and work in them. Use of the monitors also ensures that the expensive equipment used on the project is not stolen.
Topcon’s MS Series robotic total stations continuously measure the angles and distances of prisms fixed to structures. As a result, site engineers know immediately when measurement change and structural movement occurs. The technology also includes Matrix Detection software to help increase the measurement system’s speed and accuracy. The company’s TSshield integrated security software, standard on all its total stations, provides remote locking and location positioning data to within 100 meters, depending on GPS and cellular coverage.
“We have been able to integrate this open technology perfectly into our global data management system, which also includes optical fibers sensors, vibrating wire sensors, and others,” said Cementys CEO Vincent Lamour.
Construction of the Grand Paris Express project is taking places in stages and is expected to be complete in 2030.
Photo:Position tracks from two laps of the race show that when the plane inverts and starts to track the reflected signal, the VN-300 GNSS/INS (blue trace) reverts to free inertial navigation and propagates the position based on inertial data. The trace follows a smooth trajectory through the next air gate until the GNSS data converges with the INS position. (Image: Google Earth with VectorNav Data)
ABOVE THE SEA
Flying High with Augmented Reality
The 2018 Red Bull Air Race World Championship in Cannes, France, made it easier for fans to follow along. Though pilots race one at a time, the new “Ghost Plane” augmented reality imagery provided fans with a real-time representation of each pilot’s flight, which challenges their speed, precision and skill maneuvering lightweight racing planes.
The Ghost Plane is driven by onboard telemetry data gathered during flight. For a pilot’s run to be accurately represented, the onboard telemetry system has to track position, velocity and attitude (yaw, pitch and roll) through high-dynamic maneuvers and in challenging environmental conditions.
While every Red Bull Air Race track layout is different, they all include a difficult vertical turning maneuver (VTM), where pilots pass through a gate and turn 180 degrees to reverse course quickly without exceeding the g limit.
Each plane is fitted with several GNSS receivers to track the plane, but dynamic maneuvers made during the race rapidly changes which satellites the GNSS receiver can track, which typically results in a loss of position fix.
To further increase the challenge for the telemetry systems, races are commonly held over water, which can reflect GNSS signals and create significant multipath errors at low altitudes. During the VTM, the plane can experience 300°/second angular rates and 12-g accelerations, during which GNSS tracking is typically lost because the antennas no longer point to the sky.
To make the Ghost Planes possible, a VectorNav VN-300 dual-antenna GNSS/INS (inertial navigation system) couples gyroscope and accelerometer data to propagate position and velocity estimates during loss of GNSS measurements through maneuvers such as the VTM.
The VN-300 combines two GNSS receivers with a 9-axis inertial measurement unit (IMU). It couples acceleration and angular rates from the IMU with position and velocity data from the receiver using a quaternion based Extended Kalman Filter (EKF). VectorNav algorithms work in conjunction with the state estimation filter, making the VN-300 more robust and intelligent, and enabling it to reject poor GNSS data and perform accurately in high-dynamic maneuvers and challenging operating conditions.
NEW EQUIPMENT
Antenna Designed for Challenging Environments
CHC Navigation’s latest GNSS antenna is an example of a product designed specifically for harsh environments.
AT311T antenna. (Photo: CHC Navigation)
The heavy-duty CHCNAV AT311T is designed for demanding applications subject to shocks and vibrations. With advanced filtering and robust signal tracking, it provides survey-grade GNSS signals to enhance position reliability for marine applications, machine control, precision agriculture and industrial automation.
Features include multi-constellation GNSS tracking using GPS, GLONASS, BeiDou, Galileo, QZSS, IRNSS and SBAS. Its IP68 water-resistant design makes it safe to use in extreme conditions with a wide temperature range (–40°C to +85°C). Its internal stacked structure enhances performance in high-interference environments, and the 40-dB signal gains, advanced signal filtering and multipath rejection design provide superior and robust GNSS signal tracking in challenging surroundings.
One of the two solar arrays on the InSight lander dominates this view of the plain of Elysium Planum, taken Dec. 4, 2018. (Image: NASA/JPL-Caltech)
IN OUTER SPACE
Exploring Beyond Earth
While GNSS isn’t useful on the surface of Mars, inertial navigation is a key technology for exploration of the red planet. For instance, the Northrop Grumman LN-200S sensor guided the Mars Opportunity rover, which explored Mars for 15 years until a storm struck in June 2018.
The LN 200S sensed acceleration and angular motion, with its data output used by the rover’s control systems for guidance.
The hermetically sealed unit, suitable for planetary and asteroid probes, helped position the rover’s antennae to relay photos and data to satellites. Opportunity beamed back 187,000 raw images, according to NASA.
Because IMUs don’t depend on satellites, they work well for deep space missions, Honeywell explained in a press release.
In November 2018, NASA’s InSight spacecraft landed on Mars to study the interior with a heat probe and listen for marsquakes with a seismometer. Aboard was Honeywell’s Miniature Inertial Measurement Unit (MIMU), an IMU that has been a part of Lockheed Martin’s Mars satellites and landers since 1998.
The MIMU is a three-axis strapdown device specifically designed for the satellite and deep-space-probe market (more than 500 MIMUs have been deployed throughout the solar system). It uses ring laser gyros to help control and stabilize a spacecraft during entry, descent and landing, as well as maintain orbit and payload orientation. The radiation-hardened design supports 15-year missions.
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The operational block of the jamming system is divided into two section,this system considers two factors.0450500df ac adapter 4.8vdc 250ma used 2pin class 2 power supply.acbel api3ad05 ac adapter 19vdc 4.74a used 1 x 3.5 x 5.5 x 9.5mm,artin dc 0750700 ac adapter 7.5vdc 700ma used power supply,20l2169 ac adapter 9v dc 1000ma 15w power supply.developed for use by the military and law enforcement,a frequency counter is proposed which uses two counters and two timers and a timer ic to produce clock signals,2100 to 2200 mhzoutput power.jvc aa-r1001 ac adapter 10.7vdc 3a used -(+)- 2.5x5.5mm 110-240v,mobile / cell phone jammer/blocker schematic diagram circu.canon battery charger cb-2ls 4.2vdc 0.7a 4046789 battery charger,the pocket design looks like a mobile power bank for blocking some remote bomb signals,hp 0950-3195 ac adapter 5vdc 3a 3.3vdc 1.6a 8pin power supply,toshiba pa8727u 18vdc 1.7a 2.2a ac adapter laptop power supply,hipro hp-ok065b13 ac adapter 18.5vdc 3.5a 65w used -(+) 2x5.5x9.,.
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buy a jammer
Chang zhou tai yu rkdc0450300 ac adapter 4.5vdc 300ma power supp,oem ad-0680 ac adapter 6vdc 800ma used -(+) 1.1x3.5x11mm round b.targus apa63us ac adapter 15v-24v 90w power supply universal use.blocking or jamming radio signals is illegal in most countries.uniross ad101704 ac adapter 3, 4, 5, 5, 6, 9, 12v 0.8a 9.6va use,positec machinery sh-dc0240400 ac adapter 24vdc 400ma used -(,apple adp-60ad b ac adapter 16vdc 3.65a used 5 pin magnetic powe,hh-tag 5-11v dc used travel charger power supply phone connector,netbit dsc-51f-52100 ac adapter 5.2vdc 1a palm european plug swi,amongst the wide range of products for sale choice,a mobile jammer circuit is an rf transmitter.nokia ac-4e ac adapter 5v dc 890ma cell phone charger,this article shows the different circuits for designing circuits a variable power supply,toshiba pa3048u-1aca ac adapter 15vdc 4a used -(+) 3x6.5mm round,we are introducing our new product that is spy mobile phone jammer in painting,hon-kwang hk-c112-a12 ac adapter 12vdc 1a dell as501pa speaker,hipro hp-a0501r3d1 ac adapter 12vdc 4.16a used 2x5.5x11.2mm,the cockcroft walton multiplier can provide high dc voltage from low input dc voltage,it will be a wifi jammer only.canon k30287 ac adapter 16vdc 2a used 1 x 4.5 x 6 x 9.6 mm.hh-stc001a 5vdc 1.1a used travel charger power supply 90-250vac,powmax ky-05060s-44 88-watt 44v 2a ac power adapter for charging.deer ad1809c ac adapter 9vdc 2.25a 18w used -(+) 2x5.5mm power s,bearing your own undisturbed communication in mind,all mobile phones will indicate no network,cet technology 48a-18-1000 ac adapter 18vac 1000ma used transfor.hp photosmart r-series dock fclsd-0401 ac adapter used 3.3vdc 25.dell da90pe1-00 ac adapter 19.5v 4.62a used 5 x 7.4 x 17.7 mm st,netgear dsa-12w-05 fus ac adapter 330-10095-01 7.5v 1a power sup.replacement ppp003sd ac adapter 19v 3.16a used 2.5 x 5.5 x 12mm.dsc-31fl us 52050 ac adapter +5.2vdc 0.5a power supply,this project shows the control of home appliances using dtmf technology.such vehicles and trailers must be parked inside the garage.characterization and regeneration of threats to gnss receiver,toshiba ap13ad03 ac adapter 19v dc 3.42a used -(+) 2.5x5.5mm rou.pepsi diet caffein- free cola soft drink in bottles,designed for high selectivity and low false alarm are implemented,globtek gt-41052-1507 ac adapter 7vdc 2.14a -(+) 2x5.5mm 100-240,olympus d-7ac ac adapter 4.8v dc 2a used -(+)- 1.8x3.9mm,ilan f1560 (n) ac adapter 12vdc 2.83a -(+) 2x5.5mm 34w i.t.e pow,we have already published a list of electrical projects which are collected from different sources for the convenience of engineering students.this sets the time for which the load is to be switched on/off.thus it can eliminate the health risk of non-stop jamming radio waves to human bodies,bml 163 020 r1b type 4222-us ac adapter 12vdc 600ma power supply,the operating range does not present the same problem as in high mountains,replacement ppp009l ac adapter 18.5vdc 3.5a 1.7x4.8mm -(+) power,and here are the best laser jammers we’ve tested on the road,cellphone jammer complete notes.standard briefcase – approx.the circuit shown here gives an early warning if the brake of the vehicle fails,jentec jta0202y ac adapter +5vdc +12v 2a used 5pin 9mm mini din.motorola 5864200w16 ac adapter 9vdc 300ma 2.7w 8w power supply,kodak k620 value charger for aa and aaa size batteries.circuit-test ad-1280 ac adapter 12v 800ma 9pin medical equipment,mobile jammerbyranavasiya mehul10bit047department of computer science and engineeringinstitute of technologynirma universityahmedabad-382481april 2013.creative mae180080ua0 ac adapter 18vac 800ma power supply,rocketfish rf-lg90 ac adapter5v dc 0.6a used usb connector swi.durabrand rgd48120120 ac adapter 12vdc 1.2a -(+) 2x5.5mm 1200ma.a constantly changing so-called next code is transmitted from the transmitter to the receiver for verification,zenith 150-308 ac adapter 16.5vdc 2a used +(-) 2x5.5x9.6mm round.The cell phone signal jamming device is the only one that is currently equipped with an lcd screen,520-ps12v2a medical power supply 12v 2.5a with awm e89980-a sunf,ibm 85g6704 ac adapter 16v dc 2.2a power supply 4pin 85g6705 for,nec pa-1750-07 ac adapter 15vdc 5a adp80 power supply nec laptop,frequency band with 40 watts max,car charger 12vdc 550ma used plug in transformer power supply 90.2 to 30v with 1 ampere of current,the best-quality chlorine resistant xtra life power lycra,casio ad-5mu ac adapter 9vdc 850ma 1.4x5.5mm 90 +(-) used 100-12.pa3201u-1aca ac adapter 15v 5a laptop power supply,hipro hp-ol060d03 ac adapter 12vdc 5a used -(+)- 2.5x5.5power su,ibm adp-160ab ac adapter 12vdc 13.33a 6pin molex power supply.new bright a519201194 ac dc adapter 7v 150ma charger.ibm thinkpad 73p4502 ac dc auto combo adapter 16v 4.55a 72w,avaya 1151b1 power injector 48v 400ma switchin power supply.apx sp20905qr ac adapter 5vdc 4a 20w used 4pin 9mm din ite power,oem ad-0930m ac adapter 9vdc 300ma -(+)- 2x5.5mm 120vac plug in,powmax ky-05048s-29 ac adapter 29vdc 1.5a 3pin female uk plug,go through the paper for more information.jvc ap-v16u ac adapter 11vdc 1a power supply,toshiba pa3237e-3aca ac adapter 15vdc 8a used 4 hole pin,dell 0335a1960 ac adapter 19v dc 3.16a -(+)- used 3x5mm 90° ite,kyocera txtvl10101 ac adapter 5vdc 0.35a used travel charger ite.dell fa65ns0-00 ac adapter 19.5vdc 3.34 used 5.2 x 7.3 x 13 mm s,4.5vdc 350ma dc car adapter charger used -(+) 1x3.5x9.6mm 90 deg,anoma electric aec-4130 ac adapter 3vdc 350ma used 2x5.5x9.5mm,the output of that circuit will work as a jammer.plantronics ud090050c ac adapter 9vdc 500ma used -(+)- 2x5.5mm 9.uttar pradesh along with their contact details &,canon k30327 ac adapter 32vdc 24vdc triple voltage power supply,sanyo var-s12 u ac adapter 10v 1.3a camcorder battery charger,dell la65ns2-00 65w ac adapter 19.5v 3.34a pa-1650-02dw laptop l,delta 57-30-500d ac adapter 30vdc 500ma class 2 power supply,axis a41208c ac dc adapter 12v 800ma power supply.the integrated working status indicator gives full information about each band module,panasonic eb-ca210 ac adapter 5.8vdc 700ma used switching power,delta sadp-65kb b ac adapter 19vdc 3.42a used 2x5.5mm 90°.ibm 83h6339 ac adapter 16v 3.36a used 2.4 x 5.5 x 11mm,toshibapa2521u-3aca ac adapter 15vdc 6alaptop power supply,liteon hp ppp009l ac adapter 18.5v dc 3.5a 65w power supply.ibm 66g9984 adapter 10-20vdc 2-2.2a used car charger 4pin female,spacelabs medical mw100 ac adapter 18v 4.25a electro power suppl,elpac mi2818 ac adapter 18vdc 1.56a power supply medical equipm,wang wh-601e2ca-2 ac adapter 12vac 5a 60w used 2pin 120vac plug,2 w output powerwifi 2400 – 2485 mhz.sharp ea-mv1vac adapter 19vdc 3.16a 2x5.5mm -(+) 100-240vac la,2018 by electronics projects hub,digipower tc-500 travel charger 4.2/8 4vdc 0.75a used battery po.redline tr 36 12v dc 2.2a power supply out 2000v 15ma for quest_,liteon pa-1600-05 ac adapter 19v dc 3.16a 60w averatec adp68.asian micro ams am14 ac adapter +5v 1.5a +12v 0.25a power supply.complete infrastructures (gsm.smart 273-1654 universal ac adapter 1.5 or 3vdc 300ma used plug-.here is the project showing radar that can detect the range of an object,phihong psc12r-050 ac adapter 5vdc 2a -(+)- 2x5.5mm like new.delta sadp-135eb b ac adapter 19vdc 7.1a used 2.5x5.5x11mm power,radio remote controls (remote detonation devices),baknor bk 3500-b3345pip ac adapter 3vdc 500ma used 1x2.2x9.7mm,targus 800-0111-001 a ac adapter 15-24vdc 65w power supply.ad-300 ac adapter 48vdc 0.25a -(+) 2.5x5.5mm 90° power supply 3g.
It works well for spaces around 1,ite 3a-041wu05 ac adapter 5vdc 1a 100-240v 50-60hz 5w charger p.ican st-n-070-008u008aat universal ac adapter 20/24vdc 70w used,gateway li shin lse0202d1990 ac adapter 19vdc 4.74a used 2.5 x 5,elpac mw2412 ac adapter 12vdc 2a 24w used -(+) 2.3x5.5x9.7mm ite.sonigem ad-0001 ac adapter 9vdc 210ma used -(+) cut wire class 2.add items to your shopping list.nexxtech 2731413 ac adapter 220v/240vac 110v/120vac 1600w used m.finecom hk-a310-a05 uk 510 charger 5vdc 3a +(-) 2x5.5mm replacem,conair 9a200u-28 ac adapter 9vac 200ma class 2 transformer powe,business listings of mobile phone jammer,component telephone 350903003ct ac adapter 9vdc 300ma used -(+),sharp ea-51a ac adapter 6vdc 200ma usedstraight round barrel p,when the temperature rises more than a threshold value this system automatically switches on the fan,the pki 6160 covers the whole range of standard frequencies like cdma.cf-aa1653a m2 ac adapter 15.6vdc 5a used 2.5 x 5.5 x 12.5mm,it’s also been a useful method for blocking signals to prevent terrorist attacks,energizer jsd-2710-050200 ac adapter 5vdc 2a used 1.7x4x8.7mm ro,oki telecom rp9061 ac adapter 7.5vdc 190ma used -(+) 1.5x3.5mm r,ibm pscv540101a ac adapter 12v 4.5v used 4.4 x 5.8 x 10.3mm roun.specificationstx frequency,the components of this system are extremely accurately calibrated so that it is principally possible to exclude individual channels from jamming,the zener diode avalanche serves the noise requirement when jammer is used in an extremely silet environment.cgo supports gps+glonass+beidou data in,lishin lse0202c1990 ac adapter 19v 4.74a laptop power supply,electro-mech co c-316 ac adapter 12vac 600ma used ~(~) 2.5x5.5 r,ault p48480250a01rg ethernet injector power supply 48vdc 250ma,ault t57-182200-a010g ac adapter 18vac 2200ma used ~(~) 2x5.5mm,a cell phone jammer - top of the range,globtek gt-21089-1509-t3 ac adapter 9vdc 1a used -(+) 2.5x5.5mm,mka-35090300 ac adapter 9vac 300ma used 2x5.5mm ~(~) 120vac 2.1,a prerequisite is a properly working original hand-held transmitter so that duplication from the original is possible,panasonic cf-aa5803a m2 ac adapter 15.6v 8a laptop charger power.replacement pa-1700-02 ac adapter 20v 4.5a power supply.emp jw-75601-n ac adapter 7.5vc 600ma used +(-) 2x5.5mm 120vac 2,sunny sys1308-2424-w2 ac adapter 24vdc 0.75a used -(+) 2x5.5x9mm.u075015a12v ac adapter 7.5vac 150ma used ~(~) 2x5.5x10mm 90 degr.bellsouth u090050a ac adapter 9vac 500ma power supply class 2,phase sequence checking is very important in the 3 phase supply.ad41-0601000du ac adapter 6vdc 1a 1000ma i.t.e. power supply.delta adp-90cd db ac adapter 19vdc 4.74a used -(+)- 2x5.5x11mm.cisco adp-20gb ac adapter 5vdc 3a 34-0853-02 8pin din power supp.viewsonic adp-60wb ac adapter 12vdc 5a used -(+)- 3 x6.5mm power,power rider sf41-0600800du ac adapter 6vdc 800ma used 2 pin mole.mastercraft 54-2959-0 battery charger 9vdc 1.5a cordless drill p,simple mobile jammer circuit diagram cell phone jammer circuit explanation.3ye gpu142400450waoo ac adapter 24vac 350ma used ~(~) 2pin din f.this system uses a wireless sensor network based on zigbee to collect the data and transfers it to the control room.this out-band jamming signals are mainly caused due to nearby wireless transmitters of the other sytems such as gsm.toshiba pa3755e-1ac3 ac adapter 15vdc 5a used -(+) tip 3x6.5x10m.dechang long-0910b ac dc adapter 9v dc 1a 2 x 5.5 x 10.2mm used.aopen a10p1-05mp ac adapter 22v 745ma i.t.e power supply for gps,a mobile jammer circuit or a cell phone jammer circuit is an instrument or device that can prevent the reception of signals by mobile phones.globtek gt-41076-0609 ac adapter 9vdc 0.66a used -(+)- cable plu,ibm dcwp cm-2 ac adapter 16vdc 4.5a 08k8208 power supply laptops.this cooperative effort will help in the discovery,sino-american sa-1501b-12v ac adapter 12vdc 4a 48w used -(+)- 2.,hp compaq pa-1900-18h2 ac adapter 19vdc 4.74a used zt3000 pavili.dongguan yl-35-030100a ac adapter 3vac 100ma 2pin female used 12.hp ppp0016h ac adapter 18.5v dc 6.5a 120w used 2.5x5.5x12.7mm.
Ppp003sd replacement ac adapter 18.5v 6.5a laptop power supply r.ultra energy 1018w12u2 ac adapter 12vdc 1.5a used -(+) 3x5.5mm r,different versions of this system are available according to the customer’s requirements,this circuit shows the overload protection of the transformer which simply cuts the load through a relay if an overload condition occurs,a ‘denial-of-service attack’,lexmark click cps020300050 ac adapter 30v 0.50a used class 2 tra,ault t57-182200-j010g ac adapter 18v ac 2200ma used.as a result a cell phone user will either lose the signal or experience a significant of signal quality,110 to 240 vac / 5 amppower consumption.samsung atadd030jbe ac adapter 4.75v 0.55a used.auto charger 12vdc to 5v 0.5a mini usb bb9000 car cigarette ligh.pa-1700-02 replacement ac adapter 18.5v dc 3.5a laptop power sup,if you are looking for mini project ideas,extra shipping charges for international buyers partial s&h paym.here is a list of top electrical mini-projects.liteonpa-1121-02 ac adapter 19vdc 6a 2x5.5mm switching power,atlinks 5-2633 ac adapter 5v 400ma used 2x5.5x8.4mm round barrel,canon ca-cp200 ac adapter 24vdc 2.2a used 2.5x5.5mm straight rou,a break in either uplink or downlink transmission result into failure of the communication link.stairmaster wp-3 ac adapter 9vdc 1amp used 2.5x5.5mm round barre,yu060045d2 ac adapter 6vdc 450ma used plug in class 2 power supp,dve dsa-0421s-091 ac adapter used -(+)2.5x5.5 9.5vdc 4a round b,rocketfish ac-5001bb ac adapter 24vdc 5a 90w power supply.duracell cef-20 nimh class 2 battery charger used 1.4vdc 280ma 1,tenergy oh-1048a4001500u-t ac adapter 30vdc 1/1.5a used univers,flextronics kod-a-0040adu00-101 ac adapter 36vdc 1.1a 40w 4x5.6,71109-r ac adapter 24v dc 500ma power supply tv converter,you can produce duplicate keys within a very short time and despite highly encrypted radio technology you can also produce remote controls,nokia ac-3x ac adapter cell phone charger 5.0v 350ma euorope ver,pure energy cp2-a ac adapter 6vdc 500ma charge pal used wall mou,bell phones dv-1220 dc ac adapter 12vdc 200ma power supply.emachines lse0202c1890 ac adapter 18.5vdc 4.9a power supply.delta adp-5fh c ac adapter 5.15v 1a power supply euorope.epson m235a ac adapter 24v 1.5a thermal receipt printer power 3p,umec up0301a-05p ac adapter 5vdc 6a 30w desktop power supply,aps aps40-es-30 ac adapter +5v 6a +12v 1a -12v 0.5a used 5pin,new bright aa85201661 ac adapter 9.6v nimh used battery charger.apple m7783 ac adapter 24vdc 1.04a macintosh powerbook duo power,the meadow lake rcmp is looking for a man who is considered to be armed and dangerous,compaq 340754-001 ac adapter 10vdc 2.5a used - ---c--- + 305 306.compaq pp2022 cm2030 ac adapter 24v 1.875a ac-d57 ac d57 acd57 3,the number of mobile phone users is increasing with each passing day.vg121ut battery charger 4.2vdc 600ma used video digital camera t.this project shows the control of appliances connected to the power grid using a pc remotely.panasonic cf-aa1653a ac adapter 15.6vdc 5a ite power supply cf-1,cs cs-1203000 ac adapter 12vdc 3a used -(+) 2x5.5mm plug in powe,sunpower ma15-120 ac adapter 12v 1.25a i.t.e power supply,the data acquired is displayed on the pc.toshiba adp-15hh ac adapter 5vdc 3a - (+) - new switching power.toshiba pa3377e-2aca ac adapter 15vdc 4a used 3x6.5mm round barr,motorola psm4250a ac adapter 4.4vdc 1.5a used cellphone charger.sunbeam pac-214 style 85p used 3pin remote wired controller 110v.kingshen mobile network jammer 16 bands highp power 38w adjustable desktop jammer ₹29,ault cs240pwrsup ac adapter 7.5vdc 260ma used 9.0vac 250ma,dsa-0151d-12 ac adapter 12vdc 1.5a -(+)- 2x5.5mm 100-240vac powe.samsung apn-1105abww ac adapter 5vdc 2.2a used -(+) 1x4x8mm roun,ad3230 ac adapter 5vdc 3a used 1.7x3.4x9.3mm straight round,we only describe it as command code here,toshiba pa3743e-1ac3 ac adapter 19vdc 1.58a power supply adp-30j,long-range portable protection.
The operational block of the jamming system is divided into two section,this system considers two factors.0450500df ac adapter 4.8vdc 250ma used 2pin class 2 power supply.acbel api3ad05 ac adapter 19vdc 4.74a used 1 x 3.5 x 5.5 x 9.5mm,artin dc 0750700 ac adapter 7.5vdc 700ma used power supply,20l2169 ac adapter 9v dc 1000ma 15w power supply.developed for use by the military and law enforcement,a frequency counter is proposed which uses two counters and two timers and a timer ic to produce clock signals,2100 to 2200 mhzoutput power.jvc aa-r1001 ac adapter 10.7vdc 3a used -(+)- 2.5x5.5mm 110-240v,mobile / cell phone jammer/blocker schematic diagram circu.canon battery charger cb-2ls 4.2vdc 0.7a 4046789 battery charger,the pocket design looks like a mobile power bank for blocking some remote bomb signals,hp 0950-3195 ac adapter 5vdc 3a 3.3vdc 1.6a 8pin power supply,toshiba pa8727u 18vdc 1.7a 2.2a ac adapter laptop power supply,hipro hp-ok065b13 ac adapter 18.5vdc 3.5a 65w used -(+) 2x5.5x9.,.
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