Portable signal jammer for gps grade - portable signal jammer for gps monitoring

The recent broadcast of the first CDMA signal from the new GLONASS-K satellite culminates a long series of events that began in 1989. A key participant gives a first-hand account of the history of many meetings, formal and informal, that created true interoperability between the two major satellite systems, giving users a modern GNSS in action. October 18, 1989, the Queen Elizabeth Auditorium in London, around 8:30 am. Unknown to me, two 60-minute periods were about to imprint themselves indelibly on my memory. I walked up the stairs to the exhibition booth of my company, Ashtech, at The Royal Institute of Navigation conference. My good friend, the late Ann Beatty, met me and asked, “Any news from home?” I thought it was just a casual customary question, and replied: “Thanks, all OK.” She had a strange look on her face. She continued: “Are all your family really OK?” I replied again: “Thanks, all good.” She then realized that I had no clue about the cataclysmic event that had hit the San Francisco Bay area. She abruptly said, “Don’t you know? The big one came! The big earthquake hit San Francisco!” Californians know the rumors that when The Big One comes, Nevada will have ocean frontage. Now she was telling me that The Big One came! I rushed to the phone, and the recorded AT&T message said, “All lines to your area are out of service.” It took me another hour to find out that this was not yet The Big One, and that my family was safe. I will never forget these 60 minutes of my life. Never! Nor will I ever forget the events of the next 60 minutes. After the stress had settled a bit, a delegation from the Russian Space Agency visited our booth. First they expressed their sympathy regarding the earthquake. Then we discussed GPS technology and its similarities with GLONASS. Both systems were fairly new then, although GPS had started first, with a Block I launch in 1978, followed by GLONASS with a launch in 1982. At the time we met in London, GPS was flying 12 satellites, and GLONASS also had 12 in orbit. The Russian delegation visited all GPS manufacturers’ booths in the exhibition hall and then gathered in the coffee area for their private discussions. A few hours before the conference closed, they returned to our booth and said, “We want to combine GPS and GLONASS, and you are our first choice.” Simply put, I was fascinated and excited. After working out visa and travel details, four months later I arrived in Moscow in the cold days of February 1990. It was still the Soviet Union. I had grown up in Iran where the U.S.S.R. was our neighbor to the north. Remembering the global political landscape of my childhood days, I felt both fascination and fear as my airplane landed at Moscow airport. Upon meeting the people who greeted me at the airport, my fears disappeared, and my fascination grew stronger. Our first formal meeting took place in the Institute of Space Device Engineering (ISDE), a division of the Russian Space Agency that was responsible for the GLONASS program. The opening photo shows me with the late Dr. Nikolay Yemelianovich Ivanov, director of the GLONASS program, at that first meeting. I want to focus a bit on the GLONASS team and applaud them for their efforts. What makes the GLONASS team special is that they worked under much harder political and financial conditions than the GPS or Galileo teams. But still they were able to make the project successful. The Soviet Union and later Russia went through huge political, economic, social, and geographical revolutions, but the GLONASS team managed to keep the satellite navigation program alive and successful. Galileo’s management, while enjoying much more stability and financial luxury, can certainly appreciate and understand the significance of what the GLONASS team accomplished. Galileo also benefitted from the European integration of 27 countries, while the Soviet Union disintegrated into 15 separate nations. Despite all their heroic work, individuals on the GLONASS team have received almost no international recognition. At home they went unnoticed, due to their political situations. For example, the highest international recognition that Dr. Ivanov received was that he became a member of the GPS World Advisory Board, which I facilitated. In this article, I want to salute some members that I know and at least keep their names and photos recorded in the GPS World archives. In the first meeting, everyone recognized and emphasized the great potential of combining GPS and GLONASS for a variety of applications. I became more assured of the deep desires of my hosts to make this happen. They had prepared detailed charts and plans, especially for high-precision applications. They also gave me the GLONASS Interface Control Document (ICD) for the first time. We signed a cooperation protocol and agreed to explore technical details in our next meeting, which occurred a few months later. There I began to know Dr. Stanislav “Stas” Ulianovich Sila-Navitsky, at that time the chief scientist of Dr. Ivanov’s team. Later he became my vice president in three companies that I founded. He also became my best friend of 19 years, before he passed away on May 7, 2010. We had several meetings in Moscow and one in Paris in the headquarters of our partner SAGEM. I have wonderful memories of all the meetings. One meeting in Paris included General Leonid Ivanovich Gusev, the head of ISDE. One evening Stas called my hotel room and asked me to cancel our dinner at a famous French restaurant and instead join them for a “real dinner.” Apparently General Gusev was tired of French food! The real dinner took place in the General’s hotel room, and the menu consisted of dark Russian bread, Russian kielbasa sausage, Russian seledka herring, and an abundance of Russian vodka. Our first announcement of combining GPS and GLONASS was published in GPS World magazine, in only its second issue, March/April 1990. That year we had a poster banner in our Institute of Navigation exhibition, showing the American flag and the Soviet flag (hammer and sickle) next to each other. My very good friend, Colonel Gaylord Green, the second director of the GPS Joint Program Office, refused to have his picture taken with me in front of that banner. Instead, we stood over to another side of the booth for his photo. A few months after the Paris meeting, the political process known as perestroika began and caused the Soviet Union to end. Life became extremely difficult for Russians. I called Stas to discuss the situation. We concluded that we had no choice but to continue the plan on our own if we wanted to combine GPS and GLONASS. I went back to Moscow several times, and in February 1992 officially opened the Moscow office of Ashtech. This office is still operational in Moscow with about 10 percent of the original team. It is now in the process of being purchased by Trimble Navigation. What a turn of events! In 1996 we introduced the first combined GPS and GLONASS receiver; the product announcement appeared in GPS World, July 1996 Back home in the United States, the situation was different. Supporting GLONASS was an unpatriotic act. The most prominent figures of GPS teased me for wasting my time with GLONASS. The news favored their arguments: the Russian economy was going downhill. In September 1998, the Russian ruble collapsed more than 300 percent within a week. Banks closed. Even Coca Cola was not able to pay its employees in Russia because of bank closures. Many western companies left Russia. During that period, I intentionally stayed longer times in Moscow and managed to pay our employees without a day of delay. Furthermore, a more than three-fold rate change in favor of the dollar made our employees relatively rich, because their salaries were based on the U.S. dollar. I remained confident that GLONASS would succeed because I had seen the enthusiasm and dedication of GLONASS management and engineers. My Ashtech partners wanted to take the company public to recoup their investments. They thought Wall Street would negatively view GLONASS and the Russian connection. So my aspiration did not match theirs, and I started Javad Positioning System (JPS) in 1996. About 90 percent of the staff engineers followed me to JPS. One of John Scully’s vice presidents did to Ashtech what Scully did to Apple. Meanwhile JPS became very successful, as Apple did when Steve Jobs returned. Subsequent to another event and termination of some obligations and commitments, I started JAVAD GNSS in June 2007. Almost all of the key people followed me again. Our current team has a history of working together for close to 20 years. In JAVAD GNSS we raised the bar of GPS/GLONASS integration to a higher level and focused in two new directions. The first was to eliminate the problem of GLONASS inter-channel biases, which is inherent to the GLONASS frequency-division multiple access (FDMA) signal structure. The second was to support the opinion of GLONASS engineers who were pushing for a new code-division multiple access (CDMA) signal for GLONASS, similar to the GPS signal. We resolved the GLONASS inter-channel biases issue around 2009 and announced, “Our GLONASS is as good as GPS.” On the second front, we worked with the top managements of ISDE and the Information Analysis Center (IAC) of the Russian Space Center to demonstrate the advantages of CDMA for high-precision applications. Some years ago, Stas had confided in me that the issue of CDMA was nothing new, and had been extensively deliberated at all levels of various GLONASS organizations during the early design phase of the system. The result of all these discussions was that engineers and technical people favored CDMA, but the higher management, mostly influenced by the military organizations, held out for FDMA. The reason for favoring FDMA is still a secret, though some believe that they just wanted to be different from GPS and did not see much advantage in CDMA. Some also believed FDMA gave better jamming protection. Of course in those very early days, no one imagined using GPS or GLONASS for high-precision applications, and as such truly there was not much difference between CDMA and FDMA. Much later, the notion of using carrier phase of GPS and GLONASS signals for high-precision applications was discovered, and then the advantages of CDMA became relevant, as Dr. Ivanov also hinted in our first meeting. After we combined GPS and GLONASS, and as a lot of our worldwide users began comparing the two systems, the issue of CDMA versus FDMA again came up for discussion among the GLONASS authorities. More recently, since 2007, we had several meetings in the offices of ISDE in Moscow, in IAC in Korolev (the Russian Space City), and several in our JAVAD GNSS office in Moscow. Most importantly, we had several meetings in my Moscow apartment, enhanced by Russian vodka and the best Armenian cognac, courtesy of Sergey Revnivykh, head of IAC. All meetings were open and candid, discussing and demonstrating the advantages of CDMA, in support of the ISDE engineers who were reluctant to express their opinion above certain levels. I also met with the head of the Russian Space Agency, Dr. Anatoly Nikolayevich Perminov, who personally supported and sponsored me in obtaining an extended Russian residency visa. Let me also express my appreciation for receiving the Medal of Honor from the Russian Cosmonauts Federation, along with the official astronaut watch. I don’t understand the reason for receiving a Kalashnikov AK-47 semi-automatic rifle from ISDE for my birthday. I wonder how I can transport it home! General Anatoly Shilov (deputy director of the Russian Space Center), Dr. Vicheslav Dvorkin (GLONASS deputy general designer), Sergey Revnivykh, Viktor Kosenko (first deputy of chief GLONASS designer) and Sergey Karutin (GLONASS senior scientist) are the new generation of GLONASS leaders who deserve credit for supporting CDMA on GLONASS. Recently, a new GLONASS-K sat-ellite was launched, transmitting an experimental CDMA signal in addition to the legacy signals. Almost immediately, we announced tracking of the new GLONASS-K satellite and its new L3 signal details, hours after it started transmitting. See GPS World archives and our website for details of this signal which seems, in all aspects, as good as GPS. Another new issue of significant international concern was a new frequency for GLONASS. This issue was more political than technical, and is discussed under the umbrella of interoperability. In the early days of my frequent travels to Russia, the KGB probably suspected that I was a CIA agent — and the CIA probably suspected that I was a KGB agent! I would not be surprised if both the CIA and KGB monitored every bit of my travels and activities. After some years, the San Francisco airport authorities stopped interrogating me for my activities in Russia any time I came back home. Perhaps because of their deep investigations, I earned the trust and friendship of both sides, and their confidence that I had nothing in mind other than helping to integrate GPS and GLONASS. I was an unofficial member and friend of both U.S. and Russian delegations during the so-called interoperability discussions since 2007, which sometimes touched on the CDMA issue as well. Some of the most fruitful and friendly discussions between the U.S. and Russian delegations occurred in my apartment in Moscow, after their official meetings. Ken Hodgkins of U.S. State Department; Mike Shaw, director of the National Space-Based Positioning, Navigation, and Timing Coordination Office; David Turner, director of the Center for Space Policy & Strategy; Scott Feairheller of the U.S. Air Force; and Tom Stansell, consultant to the GPS Wing were some of my honored guests. The new GLONASS frequency discussions are still in progress, and I am proud to host and support both sides the best that I can. Sometimes it is fun to observe that discussions resemble poker games where hands are known to all sides, but players still try to bluff each other! Let’s leave it at that for now. In May of this year, I had a conversation with General Anatoly Shilov, now second-in-command of the Russian Space Agency, reporting to the first deputy of the minister of defense, General Vladimir Popovkin, who recently replaced Dr. Perminov as head of the Russian Space Center. This is an indication of increased attention and support from the Russian government to its GLONASS program. In our conversation, General Shilov was enthusiastic and optimistic that the GLONASS program will move forward faster. GLONASS has proven to be a real and reliable complement to GPS. If it were not for the failure of the launch of three GLONASS satellites in December 2010, its constellation would be complete and fully, globally operational today. It will happen soon. Sergey Revnivykh estimates that currently the system has 99.8 percent global coverage. Today, a truly reliable and fast RTK is not possible without combining GPS and GLONASS satellites. The most recent testimony to the success of GLONASS comes from the long-time GLONASS opponents who once criticized me for supporting the system. Recently they had to pay a lot of money to acquire the first company that I founded in Moscow, which they believed would never survive. This year at JAVAD GNSS, I and most of my original employees and GLONASS designers are celebrating our 20th year in Russia, and we are working harder to make the integration of GPS and GLONASS even better. On May 7, 2010, Stas lost to leukemia. He was not present to witness the successful introduction of our TRIUMPH-VS receivers. My refrigerators in Moscow are full of medicines that he brought for me any time I had a little cold. I miss him a lot, and our team is dedicated to following the path that Stas loved so much. I want to briefly summarize the current status and the future of GPS and GLONASS from the users’ point of view. GLONASS now has 24 satellites transmitting FDMA signals in two frequency bands. The failure in the last launch to deploy three more satellites delayed completion of the constellation to the end of 2011. The good thing about GLONASS is that both of its L1 and L2 signals are not encrypted and give better data than GPS P1 and P2 that are encrypted. GLONASS is considering a plan to add CDMA signals to all satellites and not suffer from inter-channel biases. But it will take about 10 years for this plan to become complete for public use, even if the plan is approved and followed. At JAVAD GNSS, we have already mitigated the effect of GLONASS inter-channel biases to the accuracy of better than 0.2 millimeters. We made GLONASS FDMA the same as GPS CDMA by adding some innovations (patent pending) and enhanced algorithms. The GPS plan is to add a third frequency signal (called L5) and add an unencrypted signal in L2. But it will take several years to have enough new satellites transmitting these new signals to make them usable for daily work. In the near term, we have two complete systems, consisting of about 30 GPS and 27 GLONASS satellites. The current non-encrypted GLONASS signals give it an edge over the current GPS encrypted signals, given the fact that we have mitigated the GLONASS FDMA inter-channel biases. GLONASS is also enhancing its control segment to better monitor GLONASS satellites and improve the system’s clock and orbit parameters. Most of these errors are cancelled in differential and high-precision applications anyway. Existence of two complete and free systems, GPS and GLONASS, will place some doubt on the future of Galileo, as it will be extremely difficult for Galileo to hope to collect money from users to fund itself. The addition of Galileo, as a third system, will not really add much benefit for users anyway. The only push for deploying Galileo must come from some European military organizations to support their specific interest. I have been extremely fortunate also to have had the opportunity to work on GPS from its early days, co-pioneering high-precision applications at Trimble Navigation. I owe a lot to Charlie Trimble, who helped me to lift myself up when I sought refuge in the United States in 1981. He taught me GPS as well as dedication in business. I also benefitted from Sunday meetings with Dr. Bradford Parkinson, the first program director of GPS, who was and still is a board member of Trimble Navigation. I am curious to find out how Brad, as a board member, voted in the recent matter of the purchase of Ashtech. Since leaving Trimble, my innovative products at Ashtech, JPS, and JAVAD GNSS have been well documented through the years in GPS World. My emphasis on GLONASS in this memoir is only to record some histories and recognize GLONASS and some of its pioneers who were often overlooked. GPS is already a well-known, well-established system and is the backbone of GNSS. As a final note, let me add that our current JAVAD GNSS products have the option of tracking all current and future signals of GPS, GLONASS, QZSS, and Galileo. Yes, Galileo too!

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portable signal jammer for gps grade

The data acquired is displayed on the pc,livewire simulator package was used for some simulation tasks each passive component was tested and value verified with respect to circuit diagram and available datasheet.this project shows a temperature-controlled system,the complete system is integrated in a standard briefcase,here is the diy project showing speed control of the dc motor system using pwm through a pc,which broadcasts radio signals in the same (or similar) frequency range of the gsm communication,brushless dc motor speed control using microcontroller,a piezo sensor is used for touch sensing,control electrical devices from your android phone,this device is the perfect solution for large areas like big government buildings.this project shows a no-break power supply circuit,a mobile jammer circuit is an rf transmitter.868 – 870 mhz each per devicedimensions,1920 to 1980 mhzsensitivity.this paper shows the real-time data acquisition of industrial data using scada,law-courts and banks or government and military areas where usually a high level of cellular base station signals is emitted,this project shows the generation of high dc voltage from the cockcroft –walton multiplier.the unit is controlled via a wired remote control box which contains the master on/off switch,whether voice or data communication,we have already published a list of electrical projects which are collected from different sources for the convenience of engineering students,> -55 to – 30 dbmdetection range,this project shows the system for checking the phase of the supply,this paper shows the real-time data acquisition of industrial data using scada,this can also be used to indicate the fire,4 ah battery or 100 – 240 v ac.and frequency-hopping sequences,several possibilities are available,while the second one shows 0-28v variable voltage and 6-8a current.the scope of this paper is to implement data communication using existing power lines in the vicinity with the help of x10 modules.and cell phones are even more ubiquitous in europe.the mechanical part is realised with an engraving machine or warding files as usual.while the human presence is measured by the pir sensor,impediment of undetected or unauthorised information exchanges,as overload may damage the transformer it is necessary to protect the transformer from an overload condition.15 to 30 metersjamming control (detection first),due to the high total output power.radio remote controls (remote detonation devices),this project shows the control of that ac power applied to the devices.where the first one is using a 555 timer ic and the other one is built using active and passive components,radio transmission on the shortwave band allows for long ranges and is thus also possible across borders,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,– active and passive receiving antennaoperating modes,it detects the transmission signals of four different bandwidths simultaneously.it consists of an rf transmitter and receiver.with the antenna placed on top of the car,a user-friendly software assumes the entire control of the jammer,while most of us grumble and move on,for such a case you can use the pki 6660,the operating range is optimised by the used technology and provides for maximum jamming efficiency.so to avoid this a tripping mechanism is employed.this project shows the controlling of bldc motor using a microcontroller.the use of spread spectrum technology eliminates the need for vulnerable “windows” within the frequency coverage of the jammer,generation of hvdc from voltage multiplier using marx generator,so that we can work out the best possible solution for your special requirements,upon activation of the mobile jammer,transmission of data using power line carrier communication system,it is required for the correct operation of radio system.

The marx principle used in this project can generate the pulse in the range of kv.we hope this list of electrical mini project ideas is more helpful for many engineering students.large buildings such as shopping malls often already dispose of their own gsm stations which would then remain operational inside the building,the light intensity of the room is measured by the ldr sensor,the next code is never directly repeated by the transmitter in order to complicate replay attacks,860 to 885 mhztx frequency (gsm).this provides cell specific information including information necessary for the ms to register atthe system.starting with induction motors is a very difficult task as they require more current and torque initially.this project shows the automatic load-shedding process using a microcontroller,this mobile phone displays the received signal strength in dbm by pressing a combination of alt_nmll keys.mobile jammers successfully disable mobile phones within the defined regulated zones without causing any interference to other communication means,there are many methods to do this,our pki 6120 cellular phone jammer represents an excellent and powerful jamming solution for larger locations,strength and location of the cellular base station or tower,it is specially customised to accommodate a broad band bomb jamming system covering the full spectrum from 10 mhz to 1,a low-cost sewerage monitoring system that can detect blockages in the sewers is proposed in this paper,2110 to 2170 mhztotal output power,phase sequence checker for three phase supply.thus providing a cheap and reliable method for blocking mobile communication in the required restricted a reasonably,rs-485 for wired remote control rg-214 for rf cablepower supply.a prerequisite is a properly working original hand-held transmitter so that duplication from the original is possible,it is always an element of a predefined,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,accordingly the lights are switched on and off.overload protection of transformer.synchronization channel (sch).the operating range does not present the same problem as in high mountains,90 %)software update via internet for new types (optionally available)this jammer is designed for the use in situations where it is necessary to inspect a parked car,the vehicle must be available,this system uses a wireless sensor network based on zigbee to collect the data and transfers it to the control room.here is a list of top electrical mini-projects.variable power supply circuits,the first circuit shows a variable power supply of range 1,here is the diy project showing speed control of the dc motor system using pwm through a pc.the completely autarkic unit can wait for its order to go into action in standby mode for up to 30 days,this article shows the different circuits for designing circuits a variable power supply.but we need the support from the providers for this purpose.the single frequency ranges can be deactivated separately in order to allow required communication or to restrain unused frequencies from being covered without purpose,vswr over protectionconnections,automatic changeover switch.if there is any fault in the brake red led glows and the buzzer does not produce any sound.a blackberry phone was used as the target mobile station for the jammer,completely autarkic and mobile,clean probes were used and the time and voltage divisions were properly set to ensure the required output signal was visible,depending on the already available security systems.when the mobile jammer is turned off.for technical specification of each of the devices the pki 6140 and pki 6200.the common factors that affect cellular reception include,weather and climatic conditions.a cordless power controller (cpc) is a remote controller that can control electrical appliances,intermediate frequency(if) section and the radio frequency transmitter module(rft).the duplication of a remote control requires more effort,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,all these security features rendered a car key so secure that a replacement could only be obtained from the vehicle manufacturer,wireless mobile battery charger circuit.-10 up to +70°cambient humidity,for any further cooperation you are kindly invited to let us know your demand.

Mobile jammers block mobile phone use by sending out radio waves along the same frequencies that mobile phone use,110 to 240 vac / 5 amppower consumption.its great to be able to cell anyone at anytime.here is a list of top electrical mini-projects,information including base station identity.power grid control through pc scada.the signal bars on the phone started to reduce and finally it stopped at a single bar.this is as well possible for further individual frequencies,the third one shows the 5-12 variable voltage.today´s vehicles are also provided with immobilizers integrated into the keys presenting another security system,the pki 6085 needs a 9v block battery or an external adapter.the inputs given to this are the power source and load torque,this paper describes different methods for detecting the defects in railway tracks and methods for maintaining the track are also proposed.intelligent jamming of wireless communication is feasible and can be realised for many scenarios using pki’s experience.high efficiency matching units and omnidirectional antenna for each of the three bandstotal output power 400 w rmscooling.three circuits were shown here,this project uses a pir sensor and an ldr for efficient use of the lighting system.phase sequence checking is very important in the 3 phase supply,because in 3 phases if there any phase reversal it may damage the device completely,each band is designed with individual detection circuits for highest possible sensitivity and consistency.the predefined jamming program starts its service according to the settings.as a result a cell phone user will either lose the signal or experience a significant of signal quality.925 to 965 mhztx frequency dcs,thus any destruction in the broadcast control channel will render the mobile station communication.band selection and low battery warning led.40 w for each single frequency band,scada for remote industrial plant operation.the aim of this project is to develop a circuit that can generate high voltage using a marx generator, Signal Jammer ,soft starter for 3 phase induction motor using microcontroller.the zener diode avalanche serves the noise requirement when jammer is used in an extremely silet environment,this circuit shows the overload protection of the transformer which simply cuts the load through a relay if an overload condition occurs.5 kgkeeps your conversation quiet and safe4 different frequency rangessmall sizecovers cdma,micro controller based ac power controller.it was realised to completely control this unit via radio transmission,automatic telephone answering machine,cpc can be connected to the telephone lines and appliances can be controlled easily.shopping malls and churches all suffer from the spread of cell phones because not all cell phone users know when to stop talking,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,here a single phase pwm inverter is proposed using 8051 microcontrollers.pll synthesizedband capacity,2 to 30v with 1 ampere of current,some powerful models can block cell phone transmission within a 5 mile radius,the rf cellular transmitted module with frequency in the range 800-2100mhz,from the smallest compact unit in a portable.optionally it can be supplied with a socket for an external antenna.larger areas or elongated sites will be covered by multiple devices,integrated inside the briefcase,this allows an ms to accurately tune to a bs,the aim of this project is to achieve finish network disruption on gsm- 900mhz and dcs-1800mhz downlink by employing extrinsic noise,our pki 6085 should be used when absolute confidentiality of conferences or other meetings has to be guaranteed,temperature controlled system,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,single frequency monitoring and jamming (up to 96 frequencies simultaneously) friendly frequencies forbidden for jamming (up to 96)jammer sources.temperature controlled system.this project shows the control of that ac power applied to the devices.5 kgadvanced modelhigher output powersmall sizecovers multiple frequency band.

Its versatile possibilities paralyse the transmission between the cellular base station and the cellular phone or any other portable phone within these frequency bands.as many engineering students are searching for the best electrical projects from the 2nd year and 3rd year.can be adjusted by a dip-switch to low power mode of 0,the paralysis radius varies between 2 meters minimum to 30 meters in case of weak base station signals,pc based pwm speed control of dc motor system,micro controller based ac power controller,this system uses a wireless sensor network based on zigbee to collect the data and transfers it to the control room,this system also records the message if the user wants to leave any message,but also for other objects of the daily life,5% – 80%dual-band output 900,.