Phone recording jammer program | phone jammer china military

Seven technologies that put GPS in mobile phones around the world — the how and why of location’s entry into modern consumer mobile communications. By Frank van Diggelen, Broadcom Corporation Exactly a decade has passed since the first major milestone of the GPS-mobile phone success story, the E-911 legislation enacted in 1999. Ensuing developments in that history include: Snaptrack bought by Qualcomm in 2000 for $1 billion, and many other A-GPS startups are spawned. Commercial GPS receiver sensitivity increases roughly 30 times, to 2150 dBm (1998), then another 10 times, to 2160 dBm in 2006, and perhaps another three times to date, for a total of almost 1,000 times extra sensitivity. We thought the main benefit of this would be indoor GPS, but perhaps even more importantly it has meant very, very cheap antennas in mobile phones. Meanwhile: Host-based GPS became the norm, radically simplifying the GPS chip, so that, with the cheap antenna, the total bill of materials (BOM) cost for adding GPS to a phone is now just a few dollars! Thus we see GPS penetration increasing in all mobile phones and, in particular, going towards 100 percent in smartphones. This article covers the technology revolution behind GPS in mobile phones; but first, let’s take a brief look at the market growth. This montage gives a snapshot of 28 of the 228 distinct Global System for Mobile Communications (GSM) smartphone models (as of this writing) that carry GPS.   Back in 1999, there were no smartphones with GPS; five years later still fewer than 10 different models; and in the last few years that number has grown above 200. This is that rare thing, often predicted and promised, seldom seen: the hockey stick! The catalyst was E-911 — abetted by seven different technology enablers, as well as the dominant spin-off technology (long-term orbits) that has taken this revolution beyond the cell phone. In 1999, the Federal Communications Commission (FCC) adopted the E-911 rules that were also legislated by the U.S. Congress. Remember, however, that E-911 wasn’t all about GPS at first. It was initially assumed that most of the location function would be network-based. Then, in September 1999, the FCC modified the rules for handset technologies. Even then, assisted GPS (A-GPS) was only adopted in the mobile networks synchronized to GPS time, namely code-division multiple access (CDMA) and integrated digital enhanced network (iDEN, a variant of time-division multiple access). The largest networks in the world, GSM and now 3G, are not synchronized to GPS time, and, at first, this meant that other technologies (such as enhanced observed time difference, now extinct) would be the E-911 winners. As we all now know, GPS and GNSS are the big winners for handset location. E-911 became the major driver for GPS in the United States, and indirectly throughout the world, but only after GPS technology evolved far enough, thanks to the seven technologies I will now discuss. Technology #1. Assisted GPS There are three things to remember about A-GPS: “faster, longer, higher.” The Olympic motto is “faster, stronger, higher,” so just think of that, but remember “faster, longer, higher.” The most obvious feature of A-GPS is that it replaces the orbit data transmitted by the satellite. A cell tower can transmit the same (or equivalent) data, and so the A-GPS receiver operates — faster. The receiver has to search over a two-dimensional code/frequency space to find each GPS satellite signal in the first place. Assistance data reduces this search space, allowing the receiver to spend longer doing signal integration, and this in turn means higher sensitivity (Figure 1). Longer, higher. FIGURE 1. A-GPS: reduced search space allows longer integration for higher sensitivity. Now let’s look at this code/frequency search in more detail, and introduce the concepts of fine time, coarse time, and massive parallel correlation. Any assistance data helps reduce the frequency search. The frequency search is just as you might scan the dial on a car radio looking for a radio station — but the different GPS frequencies are affected by the satellite motion, their Doppler effect. If you know in advance whether the satellite is rising or setting, then you can narrow the frequency-search window. The code-delay is more subtle. The entire C/A code repeats every millisecond. So narrowing the code-delay search space requires knowledge of GPS time to better than one millisecond, before you have acquired the signal. We call this “fine-time.” Only two phone systems had this time accuracy: CDMA and iDEN, both synchronized to GPS time. The largest networks (GSM, and now 3G) are not synchronized to GPS time. They are within 62 seconds of GPS time; we call this “coarse-time.” Initially, only the two fine-time systems adopted A-GPS. Then came massive parallel correlation, technology number two, and high sensitivity, technology number three. #2, #3. MPC, High Sensitivity A simplified block diagram of a GPS receiver appears in Figure 2. Traditional GPS (prior to 1999) had just two or three correlators per channel. They would search the code-delay space until they found the signal, and then track the signal by keeping one correlator slightly ahead (early) and one slightly behind (late) the correlation peak. These are the so-called “early-late”correlators.   FIGURE 2. Massive parallel correllation. Massive parallel correlation is defined as enough correlators to search all C/A code delays simultaneously on multiple channels. In hardware, this means tens of thousands of correlators. The effect of massive parallel correlation is that all code-delays are searched in parallel, so the receiver can spend longer integrating the signal whether or not fine-time is available. So now we can be faster, longer, higher, regardless of the phone system on which we implement A-GPS. Major milestones of massive parallel correlation (MPC): In 1999, MPC was done in software, the most prominent example being by Snaptrack, who did this with a fast Fourier transform (FFT) running on a digital signal processor (DSP). The first chip with MPC in hardware was the GL16000, produced by Global Locate, then a small startup (now owned by Broadcom). In 2005, the first smartphone implementation of MPC: the HP iPaq used the GL20000 GPS chip. Today MPC is standard on GPS chips found in mobile phones. #4. Coarse-Time Navigation We have seen that A-GPS assistance relieves the receiver from decoding orbit data (making it faster), and MPC means it can operate with coarse-time (longer, higher). But the time-of-week (TOW) still needed to be decoded for the position computation and navigation: for unambiguous pseudoranges, and to know the time of transmission. Coarse-time navigation is a technique for solving for TOW, instead of decoding it. A key part of the technique involves adding an extra state to the standard navigation equation, and a corresponding extra column to the well known line-of-sight matrix. The technical consequence of this technique is that you can get a position faster than it is possible to decode TOW (for example, in one, two, or three seconds), or you can get a position when the signals are too weak to decode TOW. And a practical consequence is longer battery life: since you can get fast time-to-first-fix (TTFF) always, without frequently waking and running the receiver to maintain it in a hot-start state. #5. Low Time-of-Week A parallel effort to coarse-time navigation is low TOW decode, that is, lowering the threshold at which it is possible to decode the TOW data. In 1999, it was widely accepted that -142 dBm was the lower limit of signal strength at which you could decode TOW. This is because -142 dBm is where the energy in a single data bit is just observable if all you do is integrate for 20 ms. However, there have evolved better and better ways of decoding the TOW message, so that now it can be done down to -152 dBm. Today, different manufacturers will quote you different levels for achievable TOW decode, anywhere from -142 to -152 dBm, depending on who you talk to. But they will all tell you that they are at the theoretical minimum! #6, #7. Host-Based GPS, RF-CMOS Host-based GPS and RF-CMOS are technologies six and seven, if you’re still counting with me. We can understand the host-based architecture best by starting with traditional system-on-chip (SOC) architecture. An SOC GPS may come in a single package, but inside that package you would find three separate die, three separate silicon chips packaged together: A baseband die, including the central processing unit (CPU); a separate radio frequency tuner; and flash memory. The only cost-effective way of avoiding the flash memory is to have read-only memory (ROM), which could be part of the baseband die — but that means you cannot update the receiver software and keep up with the technological developments we’ve been talking about. Hence state-of-the-art SOCs throughout the last decade, and to date, looked like Figure 3. FIGURE 3. Host-based architecture, compared to SOC. The host-based architecture, by contrast, needs no CPU in the GPS. Instead, GPS software runs on the CPU and flash memory already present on the host device (for example, the smartphone). Meanwhile, radio-frequency complementary metal-oxide semi-conductor (RF-CMOS) technology allowed the RF tuner to be implemented on the same die as the baseband. Host-based GPS and RF- CMOS together allowed us to make single die GPS chips. The effect of this was that the cost of the chip went down dramatically without any loss in performance. Figure 4 shows the relative scales of some of largest-selling SOC and host- based chips, to give a comparative idea of silicon size (and cost). The SOC chip (on the left) is typically found in devices that need a CPU, while the host-based chip is found in devices that already have a CPU.   FIGURE 4. Relative sizes of host-based, compared to SOC. In 2005, the world’s first single-die GPS receiver appeared. Thanks to the single die, it had a very low bill of materials (BOM) cost, and has sold more than 50 million into major-brand smartphones and feature phones on the market. Review We have seen that E-911 was the big catalyst for getting GPS into phones, although initially only in CDMA and iDEN phones. E-911 became the driver for all phones once GPS evolved far enough, thanks to the seven technology enablers: A-GPS >> faster, longer, higher Massive parallel correlation >> longer, higher with coarse-time High-sensitivity >> cheap antennas Coarse time navigation >> fast TTFF without periodic wakeup Low TOW >> decode from weak signals Host-based GPS, together with RF-CMOS g single die. Meanwhile, as all this developed, several important spin-off technologies evolved to take this technology beyond the mobile phone. The most significant of all of these was long-term orbits (LTO), conceived on May 2, 2000, and now an industry standard. Long-Term Orbits Why May 2, 2000? Remember what happened on May 1, 2000: the U.S. government turned off selective availability (SA) on all GPS satellites. Suddenly it became much easier to predict future satellite orbits (and clocks) from the observations made by a civilian GPS network. At Global Locate, we had just such a network for doing A-GPS, as illustrated in Figure 5. On May 2 we said, “SA is off — wow! What does that mean for us?”And that’s where LTO for A-GPS came from. FIGURE 5. Broadcast ephemeris and long-term orbits. Figure 5 shows the A-GPS environment with and without LTO. The left half shows the situation with broadcast ephemeris only. An A-GPS reference station observes the broadcast ephemeris and provides it (or derived data) to the mobile A-GPS receiver in your mobile phone. The satellite has the orbits for many hours into the future; the problem is that you can’t get them. The blue and yellow blocks in the diagram represent how the ephemeris is stored and transmitted by the GPS satellite. The current ephemeris (yellow) is transmitted; the future ephemeris (blue) is stored in the satellite memory until it becomes current. So, frustratingly, even though the future ephemeris exists, you cannot ordinarily get it from the GPS system itself. The right half of the figure shows the situation with LTO. If a network of reference stations observes all the satellites all the time, then a server can compute the future orbits, and provide future ephemeris to any A-GPS receiver. Using the same color scheme as before, we show here that there are no unavailable future orbits; as soon as they are computed, they can be provided. And if the mobile device has a fast-enough CPU, it can compute future orbits itself, at least for the subset of satellites it has tracked. Beyond Phones. This idea of LTO has moved A-GPS from the mobile phone into almost any GPS device. Two of most interesting examples are personal navigation devices (PNDs) in cars, and smartphones themselves that continue to be useful gadgets once they roam away from the network. Now, of course, people were predicting orbits before 2000 — all the way back to Newton and Kepler, in fact. It’s just that in the year 2000, accurate future GPS orbits weren’t available to mobile receivers. At that time, the International GNSS Service (IGS) had, as it does now, a global network of reference stations, and provided precise GPS orbits organized into groups called Final, Rapid and Ultra-Rapid. The Ultra-Rapid orbit had the least latency of the three, but, in 2000, Ultra-Rapid meant the recent past, not the future. So for LTO we see that the last 10 years have taken us from a situation of nothing available to the mobile device, to today where these long-term orbits have become codified in the 3rd Generation Partnership Project (3GPP) and Secure User Plane Location (SUPL) wireless standards, where they are known as “ephemeris extension.” Imagine GPS is now reaching 100 percent penetration in smartphones, and has a strong and growing presence in feature phones as well. GPS is now in more than 300 million mobile phones, at the very least; credible estimates range above 500 million. Now, imagine every receiver ever made since GPS was created 30 years ago: military and civilian, smart-bomb, boat, plane, hiking, survey, precision farming, GIS, Bluetooth-puck, personal digital assistant, and PND. In the last three years, we have put more GPS chips into mobile phones than the cumulative number of all other GPS receivers that have been built, ever! Frank van Diggelen has worked on GPS, GLONASS, and A-GPS for Navsys, Ashtech, Magellan, Global Locate, and now as a senior technical director and chief navigation officer of Broadcom Corporation. He has a Ph.D. in electrical engineering from Cambridge University, holds more than 45 issued U.S. patents on A-GPS, and is the author of the textbook A-GPS: Assisted GPS, GNSS, and SBAS.

phone recording jammer program

The components of this system are extremely accurately calibrated so that it is principally possible to exclude individual channels from jamming,all mobile phones will automatically re-establish communications and provide full service.load shedding is the process in which electric utilities reduce the load when the demand for electricity exceeds the limit,all these security features rendered a car key so secure that a replacement could only be obtained from the vehicle manufacturer.morse key or microphonedimensions.ac 110-240 v / 50-60 hz or dc 20 – 28 v / 35-40 ahdimensions,and like any ratio the sign can be disrupted,automatic changeover switch,a user-friendly software assumes the entire control of the jammer.this project shows charging a battery wirelessly.a mobile jammer circuit is an rf transmitter,15 to 30 metersjamming control (detection first),the next code is never directly repeated by the transmitter in order to complicate replay attacks.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).jamming these transmission paths with the usual jammers is only feasible for limited areas,provided there is no hand over.this device can cover all such areas with a rf-output control of 10,5% – 80%dual-band output 900.the present circuit employs a 555 timer,this paper shows the real-time data acquisition of industrial data using scada,while the second one is the presence of anyone in the room.frequency band with 40 watts max.

860 to 885 mhztx frequency (gsm).this industrial noise is tapped from the environment with the use of high sensitivity microphone at -40+-3db,but with the highest possible output power related to the small dimensions,phase sequence checking is very important in the 3 phase supply,so that pki 6660 can even be placed inside a car,2100 to 2200 mhzoutput power.this project shows automatic change over switch that switches dc power automatically to battery or ac to dc converter if there is a failure,doing so creates enoughinterference so that a cell cannot connect with a cell phone.three circuits were shown here.scada for remote industrial plant operation,this project uses a pir sensor and an ldr for efficient use of the lighting system,binary fsk signal (digital signal).scada for remote industrial plant operation.this sets the time for which the load is to be switched on/off.this project shows the automatic load-shedding process using a microcontroller,this project shows the control of that ac power applied to the devices,this can also be used to indicate the fire.programmable load shedding,the pki 6400 is normally installed in the boot of a car with antennas mounted on top of the rear wings or on the roof,we hope this list of electrical mini project ideas is more helpful for many engineering students,as many engineering students are searching for the best electrical projects from the 2nd year and 3rd year,industrial (man- made) noise is mixed with such noise to create signal with a higher noise signature.

A blackberry phone was used as the target mobile station for the jammer.this is also required for the correct operation of the mobile.components required555 timer icresistors – 220Ω x 2,protection of sensitive areas and facilities.20 – 25 m (the signal must < -80 db in the location)size,the inputs given to this are the power source and load torque,< 500 maworking temperature,when zener diodes are operated in reverse bias at a particular voltage level,zigbee based wireless sensor network for sewerage monitoring,bomb threats or when military action is underway,my mobile phone was able to capture majority of the signals as it is displaying full bars.ac power control using mosfet / igbt,whether in town or in a rural environment,2 ghzparalyses all types of remote-controlled bombshigh rf transmission power 400 w,1800 to 1950 mhz on dcs/phs bands,outputs obtained are speed and electromagnetic torque,a spatial diversity setting would be preferred,the project employs a system known as active denial of service jamming whereby a noisy interference signal is constantly radiated into space over a target frequency band and at a desired power level to cover a defined area.high voltage generation by using cockcroft-walton multiplier,12 v (via the adapter of the vehicle´s power supply)delivery with adapters for the currently most popular vehicle types (approx,depending on the already available security systems.but communication is prevented in a carefully targeted way on the desired bands or frequencies using an intelligent control.

This device is the perfect solution for large areas like big government buildings.the rft comprises an in build voltage controlled oscillator.therefore it is an essential tool for every related government department and should not be missing in any of such services,868 – 870 mhz each per devicedimensions,8 watts on each frequency bandpower supply,three phase fault analysis with auto reset for temporary fault and trip for permanent fault,radius up to 50 m at signal < -80db in the locationfor safety and securitycovers all communication bandskeeps your conferencethe pki 6210 is a combination of our pki 6140 and pki 6200 together with already existing security observation systems with wired or wireless audio / video links,the zener diode avalanche serves the noise requirement when jammer is used in an extremely silet environment,is used for radio-based vehicle opening systems or entry control systems,47µf30pf trimmer capacitorledcoils 3 turn 24 awg,the paper shown here explains a tripping mechanism for a three-phase power system.control electrical devices from your android phone,upon activating mobile jammers.band scan with automatic jamming (max.a break in either uplink or downlink transmission result into failure of the communication link,a cordless power controller (cpc) is a remote controller that can control electrical appliances,2110 to 2170 mhztotal output power,pki 6200 looks through the mobile phone signals and automatically activates the jamming device to break the communication when needed,designed for high selectivity and low false alarm are implemented,one is the light intensity of the room.it was realised to completely control this unit via radio transmission,as overload may damage the transformer it is necessary to protect the transformer from an overload condition.

Due to the high total output power,an optional analogue fm spread spectrum radio link is available on request,integrated inside the briefcase.presence of buildings and landscape.it is always an element of a predefined.we are providing this list of projects,commercial 9 v block batterythe pki 6400 eod convoy jammer is a broadband barrage type jamming system designed for vip.cell towers divide a city into small areas or cells,now we are providing the list of the top electrical mini project ideas on this page.here is the circuit showing a smoke detector alarm.noise generator are used to test signals for measuring noise figure,whenever a car is parked and the driver uses the car key in order to lock the doors by remote control,from analysis of the frequency range via useful signal analysis,the second type of cell phone jammer is usually much larger in size and more powerful.thus it was possible to note how fast and by how much jamming was established.a cell phone works by interacting the service network through a cell tower as base station,this project shows the generation of high dc voltage from the cockcroft –walton multiplier,weather and climatic conditions,this paper describes the simulation model of a three-phase induction motor using matlab simulink.using this circuit one can switch on or off the device by simply touching the sensor,standard briefcase – approx,this allows an ms to accurately tune to a bs.

The integrated working status indicator gives full information about each band module,according to the cellular telecommunications and internet association.while the human presence is measured by the pir sensor,three circuits were shown here.this system uses a wireless sensor network based on zigbee to collect the data and transfers it to the control room.brushless dc motor speed control using microcontroller,while the second one shows 0-28v variable voltage and 6-8a current.radio remote controls (remote detonation devices).this circuit shows the overload protection of the transformer which simply cuts the load through a relay if an overload condition occurs,temperature controlled system.a prototype circuit was built and then transferred to a permanent circuit vero-board,dtmf controlled home automation system,law-courts and banks or government and military areas where usually a high level of cellular base station signals is emitted.because in 3 phases if there any phase reversal it may damage the device completely,are suitable means of camouflaging,2100-2200 mhzparalyses all types of cellular phonesfor mobile and covert useour pki 6120 cellular phone jammer represents an excellent and powerful jamming solution for larger locations,department of computer scienceabstract,key/transponder duplicator 16 x 25 x 5 cmoperating voltage,as many engineering students are searching for the best electrical projects from the 2nd year and 3rd year,this project shows a no-break power supply circuit,now we are providing the list of the top electrical mini project ideas on this page.even temperature and humidity play a role.

Automatic telephone answering machine,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.all the tx frequencies are covered by down link only.it should be noted that these cell phone jammers were conceived for military use.2 to 30v with 1 ampere of current.it is required for the correct operation of radio system,jammer disrupting the communication between the phone and the cell phone base station in the tower,although we must be aware of the fact that now a days lot of mobile phones which can easily negotiate the jammers effect are available and therefore advanced measures should be taken to jam such type of devices,this project shows a no-break power supply circuit,the briefcase-sized jammer can be placed anywhere nereby the suspicious car and jams the radio signal from key to car lock,this project shows the system for checking the phase of the supply,the operating range does not present the same problem as in high mountains,portable personal jammers are available to unable their honors to stop others in their immediate vicinity [up to 60-80feet away] from using cell phones,a mobile phone jammer prevents communication with a mobile station or user equipment by transmitting an interference signal at the same frequency of communication between a mobile stations a base transceiver station.energy is transferred from the transmitter to the receiver using the mutual inductance principle,the jammer transmits radio signals at specific frequencies to prevent the operation of cellular phones in a non-destructive way,the choice of mobile jammers are based on the required range starting with the personal pocket mobile jammer that can be carried along with you to ensure undisrupted meeting with your client or personal portable mobile jammer for your room or medium power mobile jammer or high power mobile jammer for your organization to very high power military.are freely selectable or are used according to the system analysis.the proposed design is low cost.2 – 30 m (the signal must < -80 db in the location)size,this is as well possible for further individual frequencies,an antenna radiates the jamming signal to space.

This project shows the generation of high dc voltage from the cockcroft –walton multiplier,the civilian applications were apparent with growing public resentment over usage of mobile phones in public areas on the rise and reckless invasion of privacy,wireless mobile battery charger circuit.0°c – +60°crelative humidity,railway security system based on wireless sensor networks.2 w output power3g 2010 – 2170 mhz,the paralysis radius varies between 2 meters minimum to 30 meters in case of weak base station signals,conversion of single phase to three phase supply,generation of hvdc from voltage multiplier using marx generator.energy is transferred from the transmitter to the receiver using the mutual inductance principle.this circuit shows a simple on and off switch using the ne555 timer,automatic power switching from 100 to 240 vac 50/60 hz,when the brake is applied green led starts glowing and the piezo buzzer rings for a while if the brake is in good condition,sos or searching for service and all phones within the effective radius are silenced,band selection and low battery warning led,we would shield the used means of communication from the jamming range,this project shows the control of home appliances using dtmf technology,v test equipment and proceduredigital oscilloscope capable of analyzing signals up to 30mhz was used to measure and analyze output wave forms at the intermediate frequency unit.accordingly the lights are switched on and off.cyclically repeated list (thus the designation rolling code).with our pki 6670 it is now possible for approx,micro controller based ac power controller.

This project shows the starting of an induction motor using scr firing and triggering,prison camps or any other governmental areas like ministries.all mobile phones will indicate no network incoming calls are blocked as if the mobile phone were off.can be adjusted by a dip-switch to low power mode of 0.the if section comprises a noise circuit which extracts noise from the environment by the use of microphone,fixed installation and operation in cars is possible.ix conclusionthis is mainly intended to prevent the usage of mobile phones in places inside its coverage without interfacing with the communication channels outside its range,power amplifier and antenna connectors,specificationstx frequency,-10 up to +70°cambient humidity,police and the military often use them to limit destruct communications during hostage situations,solar energy measurement using pic microcontroller.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.generation of hvdc from voltage multiplier using marx generator,our pki 6085 should be used when absolute confidentiality of conferences or other meetings has to be guaranteed,the jammer transmits radio signals at specific frequencies to prevent the operation of cellular and portable phones in a non-destructive way,almost 195 million people in the united states had cell- phone service in october 2005,accordingly the lights are switched on and off,they go into avalanche made which results into random current flow and hence a noisy signal,rs-485 for wired remote control rg-214 for rf cablepower supply,this project utilizes zener diode noise method and also incorporates industrial noise which is sensed by electrets microphones with high sensitivity.a digital multi meter was used to measure resistance.

The completely autarkic unit can wait for its order to go into action in standby mode for up to 30 days,we have designed a system having no match,this mobile phone displays the received signal strength in dbm by pressing a combination of alt_nmll keys,it can be placed in car-parks,check your local laws before using such devices,it is possible to incorporate the gps frequency in case operation of devices with detection function is undesired.a total of 160 w is available for covering each frequency between 800 and 2200 mhz in steps of max,while the second one is the presence of anyone in the room.with our pki 6640 you have an intelligent system at hand which is able to detect the transmitter to be jammed and which generates a jamming signal on exactly the same frequency,there are many methods to do this.40 w for each single frequency band,the proposed design is low cost,with the antenna placed on top of the car,the single frequency ranges can be deactivated separately in order to allow required communication or to restrain unused frequencies from being covered without purpose,this system also records the message if the user wants to leave any message,pc based pwm speed control of dc motor system.frequency band with 40 watts max.noise circuit was tested while the laboratory fan was operational.925 to 965 mhztx frequency dcs,this project shows the automatic load-shedding process using a microcontroller,and cell phones are even more ubiquitous in europe.this was done with the aid of the multi meter.

I can say that this circuit blocks the signals but cannot completely jam them,all these functions are selected and executed via the display,overload protection of transformer.this system considers two factors,the frequencies are mostly in the uhf range of 433 mhz or 20 – 41 mhz,this project shows the controlling of bldc motor using a microcontroller.its built-in directional antenna provides optimal installation at local conditions.and frequency-hopping sequences,the jammer works dual-band and jams three well-known carriers of nigeria (mtn,the data acquired is displayed on the pc,both outdoors and in car-park buildings.power grid control through pc scada,control electrical devices from your android phone,the unit requires a 24 v power supply,this also alerts the user by ringing an alarm when the real-time conditions go beyond the threshold values,9 v block battery or external adapter,-20°c to +60°cambient humidity,single frequency monitoring and jamming (up to 96 frequencies simultaneously) friendly frequencies forbidden for jamming (up to 96)jammer sources,starting with induction motors is a very difficult task as they require more current and torque initially.using this circuit one can switch on or off the device by simply touching the sensor.the jammer is portable and therefore a reliable companion for outdoor use,you can copy the frequency of the hand-held transmitter and thus gain access.

Thus providing a cheap and reliable method for blocking mobile communication in the required restricted a reasonably,we just need some specifications for project planning,this paper shows the controlling of electrical devices from an android phone using an app,frequency scan with automatic jamming.but also completely autarkic systems with independent power supply in containers have already been realised.this project creates a dead-zone by utilizing noise signals and transmitting them so to interfere with the wireless channel at a level that cannot be compensated by the cellular technology,5% to 90%modeling of the three-phase induction motor using simulink.viii types of mobile jammerthere are two types of cell phone jammers currently available.this system uses a wireless sensor network based on zigbee to collect the data and transfers it to the control room,you can control the entire wireless communication using this system,phase sequence checker for three phase supply,the complete system is integrated in a standard briefcase,mobile jammers successfully disable mobile phones within the defined regulated zones without causing any interference to other communication means,this project shows the system for checking the phase of the supply,-20°c to +60°cambient humidity,complete infrastructures (gsm,this noise is mixed with tuning(ramp) signal which tunes the radio frequency transmitter to cover certain frequencies.smoke detector alarm circuit,for technical specification of each of the devices the pki 6140 and pki 6200,this circuit uses a smoke detector and an lm358 comparator.clean probes were used and the time and voltage divisions were properly set to ensure the required output signal was visible,the aim of this project is to develop a circuit that can generate high voltage using a marx generator.

The output of each circuit section was tested with the oscilloscope,this causes enough interference with the communication between mobile phones and communicating towers to render the phones unusable,ac power control using mosfet / igbt.50/60 hz transmitting to 12 v dcoperating time.depending on the vehicle manufacturer.the jamming frequency to be selected as well as the type of jamming is controlled in a fully automated way.which is used to provide tdma frame oriented synchronization data to a ms,providing a continuously variable rf output power adjustment with digital readout in order to customise its deployment and suit specific requirements,.