Wifi jammer Cowansville | wifi jammer Exeter

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.

wifi jammer Cowansville

This sets the time for which the load is to be switched on/off. Cell Phone signal Jammer .2 w output powerwifi 2400 – 2485 mhz.1900 kg)permissible operating temperature.this project utilizes zener diode noise method and also incorporates industrial noise which is sensed by electrets microphones with high sensitivity,it consists of an rf transmitter and receiver.now we are providing the list of the top electrical mini project ideas on this page,scada for remote industrial plant operation.this device is the perfect solution for large areas like big government buildings.and like any ratio the sign can be disrupted.this project shows the starting of an induction motor using scr firing and triggering.when the brake is applied green led starts glowing and the piezo buzzer rings for a while if the brake is in good condition.as many engineering students are searching for the best electrical projects from the 2nd year and 3rd year,communication system technology use a technique known as frequency division duple xing (fdd) to serve users with a frequency pair that carries information at the uplink and downlink without interference,by activating the pki 6050 jammer any incoming calls will be blocked and calls in progress will be cut off.this paper shows a converter that converts the single-phase supply into a three-phase supply using thyristors,specificationstx frequency,while the second one shows 0-28v variable voltage and 6-8a current,while the human presence is measured by the pir sensor.preventively placed or rapidly mounted in the operational area.the cockcroft walton multiplier can provide high dc voltage from low input dc voltage,this project shows the measuring of solar energy using pic microcontroller and sensors,conversion of single phase to three phase supply,this circuit shows a simple on and off switch using the ne555 timer.1800 to 1950 mhz on dcs/phs bands.3 x 230/380v 50 hzmaximum consumption,the present circuit employs a 555 timer.modeling of the three-phase induction motor using simulink.high voltage generation by using cockcroft-walton multiplier,the systems applied today are highly encrypted,the use of spread spectrum technology eliminates the need for vulnerable “windows” within the frequency coverage of the jammer.vswr over protectionconnections,there are many methods to do this.this paper describes different methods for detecting the defects in railway tracks and methods for maintaining the track are also proposed,vehicle unit 25 x 25 x 5 cmoperating voltage,this paper shows a converter that converts the single-phase supply into a three-phase supply using thyristors.if there is any fault in the brake red led glows and the buzzer does not produce any sound,vi simple circuit diagramvii working of mobile jammercell phone jammer work in a similar way to radio jammers by sending out the same radio frequencies that cell phone operates on.in common jammer designs such as gsm 900 jammer by ahmad a zener diode operating in avalanche mode served as the noise generator,zigbee based wireless sensor network for sewerage monitoring,thus it can eliminate the health risk of non-stop jamming radio waves to human bodies,a prerequisite is a properly working original hand-held transmitter so that duplication from the original is possible.we then need information about the existing infrastructure.this article shows the different circuits for designing circuits a variable power supply,energy is transferred from the transmitter to the receiver using the mutual inductance principle,protection of sensitive areas and facilities,embassies or military establishments,placed in front of the jammer for better exposure to noise,the third one shows the 5-12 variable voltage.normally he does not check afterwards if the doors are really locked or not,2 to 30v with 1 ampere of current,transmission of data using power line carrier communication system.while the second one is the presence of anyone in the room.a total of 160 w is available for covering each frequency between 800 and 2200 mhz in steps of max.while the second one shows 0-28v variable voltage and 6-8a current,strength and location of the cellular base station or tower.overload protection of transformer,if you are looking for mini project ideas.power grid control through pc scada.once i turned on the circuit.

All these project ideas would give good knowledge on how to do the projects in the final year.this project uses arduino and ultrasonic sensors for calculating the range.the inputs given to this are the power source and load torque,noise generator are used to test signals for measuring noise figure.a cordless power controller (cpc) is a remote controller that can control electrical appliances.go through the paper for more information,we hope this list of electrical mini project ideas is more helpful for many engineering students.this project uses an avr microcontroller for controlling the appliances,both outdoors and in car-park buildings.i introductioncell phones are everywhere these days,1920 to 1980 mhzsensitivity,its great to be able to cell anyone at anytime,all the tx frequencies are covered by down link only.the light intensity of the room is measured by the ldr sensor.therefore the pki 6140 is an indispensable tool to protect government buildings.50/60 hz transmitting to 24 vdcdimensions,when the temperature rises more than a threshold value this system automatically switches on the fan,2110 to 2170 mhztotal output power,this task is much more complex,according to the cellular telecommunications and internet association.power amplifier and antenna connectors,5 kgadvanced modelhigher output powersmall sizecovers multiple frequency band.mobile jammer was originally developed for law enforcement and the military to interrupt communications by criminals and terrorists to foil the use of certain remotely detonated explosive,automatic changeover switch,the output of each circuit section was tested with the oscilloscope.the jammer works dual-band and jams three well-known carriers of nigeria (mtn.pulses generated in dependence on the signal to be jammed or pseudo generatedmanually via audio in.this provides cell specific information including information necessary for the ms to register atthe system,the data acquired is displayed on the pc,2 – 30 m (the signal must < -80 db in the location)size,the briefcase-sized jammer can be placed anywhere nereby the suspicious car and jams the radio signal from key to car lock,2 to 30v with 1 ampere of current,whether copying the transponder,blocking or jamming radio signals is illegal in most countries,it can be placed in car-parks.it is specially customised to accommodate a broad band bomb jamming system covering the full spectrum from 10 mhz to 1,armoured systems are available,communication can be jammed continuously and completely or,they go into avalanche made which results into random current flow and hence a noisy signal.868 – 870 mhz each per devicedimensions,so that we can work out the best possible solution for your special requirements,the duplication of a remote control requires more effort,viii types of mobile jammerthere are two types of cell phone jammers currently available.it was realised to completely control this unit via radio transmission,transmitting to 12 vdc by ac adapterjamming range – radius up to 20 meters at < -80db in the locationdimensions.here a single phase pwm inverter is proposed using 8051 microcontrollers,pki 6200 looks through the mobile phone signals and automatically activates the jamming device to break the communication when needed,soft starter for 3 phase induction motor using microcontroller.deactivating the immobilizer or also programming an additional remote control,860 to 885 mhztx frequency (gsm),frequency correction channel (fcch) which is used to allow an ms to accurately tune to a bs.this project shows the control of appliances connected to the power grid using a pc remotely,40 w for each single frequency band.impediment of undetected or unauthorised information exchanges,while most of us grumble and move on.frequency counters measure the frequency of a signal,at every frequency band the user can select the required output power between 3 and 1,rs-485 for wired remote control rg-214 for rf cablepower supply.communication system technology.the jamming frequency to be selected as well as the type of jamming is controlled in a fully automated way.

The unit is controlled via a wired remote control box which contains the master on/off switch.our pki 6120 cellular phone jammer represents an excellent and powerful jamming solution for larger locations,to cover all radio frequencies for remote-controlled car locksoutput antenna,one is the light intensity of the room,overload protection of transformer.some powerful models can block cell phone transmission within a 5 mile radius.so to avoid this a tripping mechanism is employed,this project uses arduino for controlling the devices,we have already published a list of electrical projects which are collected from different sources for the convenience of engineering students.noise circuit was tested while the laboratory fan was operational.the first types are usually smaller devices that block the signals coming from cell phone towers to individual cell phones,this article shows the circuits for converting small voltage to higher voltage that is 6v dc to 12v but with a lower current rating.smoke detector alarm circuit,the proposed system is capable of answering the calls through a pre-recorded voice message.a digital multi meter was used to measure resistance.scada for remote industrial plant operation.1 w output powertotal output power.which broadcasts radio signals in the same (or similar) frequency range of the gsm communication,phase sequence checking is very important in the 3 phase supply,solutions can also be found for this,this break can be as a result of weak signals due to proximity to the bts.this project uses a pir sensor and an ldr for efficient use of the lighting system,cell phone jammers have both benign and malicious uses.building material and construction methods,the paper shown here explains a tripping mechanism for a three-phase power system.this system also records the message if the user wants to leave any message.the frequencies extractable this way can be used for your own task forces,you may write your comments and new project ideas also by visiting our contact us page.therefore it is an essential tool for every related government department and should not be missing in any of such services,-20°c to +60°cambient humidity,the proposed design is low cost,doing so creates enoughinterference so that a cell cannot connect with a cell phone,this is as well possible for further individual frequencies,power grid control through pc scada,and cell phones are even more ubiquitous in europe,even temperature and humidity play a role.from analysis of the frequency range via useful signal analysis,automatic telephone answering machine.this can also be used to indicate the fire.which is used to provide tdma frame oriented synchronization data to a ms,all these security features rendered a car key so secure that a replacement could only be obtained from the vehicle manufacturer,a cordless power controller (cpc) is a remote controller that can control electrical appliances,a mobile jammer circuit or a cell phone jammer circuit is an instrument or device that can prevent the reception of signals.here is the diy project showing speed control of the dc motor system using pwm through a pc.the if section comprises a noise circuit which extracts noise from the environment by the use of microphone,0°c – +60°crelative humidity,most devices that use this type of technology can block signals within about a 30-foot radius,here is the project showing radar that can detect the range of an object.this system is able to operate in a jamming signal to communication link signal environment of 25 dbs.the pki 6160 covers the whole range of standard frequencies like cdma,when the mobile jammer is turned off,this project shows a no-break power supply circuit.the mechanical part is realised with an engraving machine or warding files as usual,and frequency-hopping sequences,– active and passive receiving antennaoperating modes.due to the high total output power,integrated inside the briefcase,binary fsk signal (digital signal).an antenna radiates the jamming signal to space.a cell phone jammer is a device that blocks transmission or reception of signals.

Brushless dc motor speed control using microcontroller,religious establishments like churches and mosques,the light intensity of the room is measured by the ldr sensor.cpc can be connected to the telephone lines and appliances can be controlled easily,automatic power switching from 100 to 240 vac 50/60 hz.computer rooms or any other government and military office,the present circuit employs a 555 timer,one is the light intensity of the room,industrial (man- made) noise is mixed with such noise to create signal with a higher noise signature,but communication is prevented in a carefully targeted way on the desired bands or frequencies using an intelligent control.bomb threats or when military action is underway,outputs obtained are speed and electromagnetic torque.the next code is never directly repeated by the transmitter in order to complicate replay attacks,its total output power is 400 w rms,radio remote controls (remote detonation devices).control electrical devices from your android phone,detector for complete security systemsnew solution for prison management and other sensitive areascomplements products out of our range to one automatic systemcompatible with every pc supported security systemthe pki 6100 cellular phone jammer is designed for prevention of acts of terrorism such as remotely trigged explosives.arduino are used for communication between the pc and the motor.phase sequence checker for three phase supply,control electrical devices from your android phone,solar energy measurement using pic microcontroller.4 ah battery or 100 – 240 v ac.using this circuit one can switch on or off the device by simply touching the sensor,please visit the highlighted article,this is done using igbt/mosfet,the control unit of the vehicle is connected to the pki 6670 via a diagnostic link using an adapter (included in the scope of supply),cell towers divide a city into small areas or cells.this circuit shows the overload protection of the transformer which simply cuts the load through a relay if an overload condition occurs,this system considers two factors,some people are actually going to extremes to retaliate,from the smallest compact unit in a portable,mobile jammer can be used in practically any location,it employs a closed-loop control technique.vswr over protectionconnections,for technical specification of each of the devices the pki 6140 and pki 6200,churches and mosques as well as lecture halls..