A Technical Report Into Cell Phone Jammers

A Technical Report Into Cell Phone Jammers Cell phone jammer is device used to prevent cellular phones from receiving signal from base station. They can be used anywhere but mostly used where phone call would be disruptive. Cell phones are very useful because we are able to contact anyone at anytime but sometimes it become nuisance. Some cell phone users dont know when to stop talking. Jammers are used at classrooms, temples, churches where silence is required. It creates a temporary dead zone to all cell phone traffic in their air system. How Cell Phone Jammer works Disrupting a cell phone is the same as jamming any other type of radio communication. A cell phone works by communicating with its service network through a cell tower or base station. Cell towers divide a city into small areas. As a cell-phone user drives down the street, the signal is handed from tower to tower. Jamming device transmits on the same radio frequencies as the cell phone, disrupting the communication between the phone and the cell-phone base station in the tower. Its a called a denial-of-service attack. The jammer denies service of the radio spectrum to the cell-phone users within range of the jamming device. Cell phone Jamming Device Jamming devices overpower the cell phone by transmitting a signal on the same frequency and at a high enough power that the two signals collide and cancel each other out. Cell phones are designed to add power if they experience low-level interference, so the jammer must recognize and match the power increase from the phone. Cell phones are full-duplex devices, which mean they use two separate frequencies, one for talking and one for listening simultaneously. Some jammers block only one of the frequencies used by cell phones, which has the effect of blocking both. The phone is tricked into thinking there is no service because it can receive only one of the frequencies. Less complex devices block only one group of frequencies, while sophisticated jammers can block several types of networks at once to head off dual-mode or tri-mode phones that automatically switch among different network types to find an open signal. Some of the high-end devices block all frequencies at once, and others can be tuned to specific frequencies. To jam a cell phone, you need a device that broadcasts on the correct frequencies. Although different cellular systems process signals differently, all cell-phone networks use radio signals that can be interrupted. GSM, used in digital cellular and PCS-based systems, operates in the 900-MHz and 1800-MHz bands in Europe and Asia and in the 1900-MHz band in the United States. Jammers can broadcast on any frequency and are effective against AMPS, CDMA, TDMA, GSM, PCS, DCS, iDEN and Nextel systems. Old-fashioned analog cell phones and todays digital devices are equally susceptible to jamming. The range of the jammer depends on its power and the local environment, which may include hills or walls of a building that block the jamming signal. Low-powered jammers block calls in a range of about 30 feet (9 m). Higher-powered units create a cell-free zone as large as a football field. Units used by law enforcement can shut down service up to 1 mile (1.6 km) from the device. Inside Cell phone Jammers Cell-phone jammers are very basic devices. It just has an on/off switch and a light that indicates its on. More complex devices have switches to activate jamming at different frequencies. Components of a jammer: Antenna Every jamming device has an antenna to send the signal. Some are contained within an electrical cabinet. On stronger devices, antennas are external to provide longer range and may be tuned for individual frequencies. Circuitry: The main electronic components of a jammer are: Voltage-controlled oscillator Generates the radio signal that will interfere with the cell phone signal Tuning circuit Controls the frequency at which the jammer broadcasts its signal by sending a particular voltage to the oscillator Noise generator Produces random electronic output in a specified frequency range to jam the cell-phone network signal (part of the tuning circuit) RF amplification (gain stage) Boosts the power of the radio frequency output to high enough levels to jam a signal Power supply Smaller jamming devices are battery operated. Some look like cell phone and use cell-phone batteries. Stronger devices can be plugged into a standard outlet or wired into a vehicles electrical system. Cell phone Jammer Applications Cell phone jamming devices were originally developed for law enforcement and the military to interrupt communications by criminals and terrorists. The bombs that blew up commuter trains in Spain in March 2004, as well as blasts in Bali in October 2002 and Jakarta in August 2003, all relied on cell phones to trigger explosives. It has been widely reported that a cell-phone jammer thwarted an assassination attempt on Pakistani President Musharraf in December 2003. When President Bush visited London in November 2004, it was reported that British police considered using jammers to protect the presidents motorcade through London. During a hostage situation, police can control when and where a captor can make a phone call. Police can block phone calls during a drug raid so suspects cant communicate outside the area. Cell-phone jammers can be used in areas where radio transmissions are dangerous, (areas with a potentially explosive atmosphere), such as chemical storage facilities or grain elevators. Corporations use jammers to stop corporate espionage by blocking voice transmissions and photo transmissions from camera phones. There are rumors that hotel chains install jammers to block guests cell-phone usage and force them to use in-room phones at high rates. Cell Phone Jamming Legal Issues In the United States, United Kingdom, Australia and many other countries, blocking cell-phone services is against the law. In the United States, cell-phone jamming is covered under the Communications Act of 1934, which prohibits people from willfully or maliciously interfering with the radio communications of any station licensed or authorized to operate. In fact, the manufacture, importation, sale or offer for sale, including advertising, of devices designed to block or jam wireless transmissions is prohibited as well. Jamming is seen as property theft, because a private company has purchased the rights to the radio spectrum, and jamming the spectrum is akin to stealing the property the company has purchased. The Federal Communications Commission is charged with enforcing jamming laws. However, the agency has not yet prosecuted anyone for cell-phone jamming. In most countries, it is illegal for private citizens to jam cell-phone transmission, but some countries are allowing businesses and government organizations to install jammers in areas where cell-phone use is seen as a public nuisance. Armenia: legal [citation needed] Australia: illegal to operate, supply or possess Belgium: illegal to sell, possess and operate (licensed part of the spectrum). Canada: illegal, except by federal law-enforcement agencies who have obtained approval Peoples Republic of China: Used by the Education government department as a method of thwarting cheating in schools. During major end of year exams, mobile phone jammers are used in areas surrounding high schools to prevent students inside from receiving calls or text messages, which may be used for illicit purposes. In some municipalities however, rather than the use of jammers, mobile signal towers close to schools are temporarily shut down for the duration of the week as exams are in progress. Czech Republic: illegal. Denmark: illegal. Finland: illegal. France: France legalized cell-phone jammers in (movie) theaters and other places with performances in 2004.Abandoned due to complaints regarding emergency calls. Still legally used inside jails. Germany: illegal, but installation in jails has been proposed. India: Government, Religious Places, Prisons and Educational Institution use jammers. Iran: illegal to operate for civilians but allowed for police forces and military. It is however legal to own such units, which can be bought in electronic markets without a license. In most jails, libraries and university classrooms such jammers are already in use. In the 2009-2010 Iranian election protests, police forces used cell phone and Bluetooth jammers. Ireland: illegal to operate. Legally used inside prisons by the Irish Prison Service. Italy: technically not illegal to own, but illegal to operate, since the Italian law specifically prohibits disturbing radio and telephoning communications. GSM jammers are however legal to be used in places like hospitals, churches, movie theatres and other places with performances, and other buildings where and when the use of mobile telephones may result in a leak of sensitive information: on such occasions, jammers are legal as long as their operation doesnt interfere with electronic medical equipment and allows mobile phones to make emergency calls. Tri-Band Jammers are reserved to, and in use with, the police forces and are being experimented in prisons. Japan: Illegal to use, but legal to own. Buying of mobile short range versions is allowed. Use of fixed high output jammers with long range is illegal, with fines of up to max $250,000USD and/or 5 years in prison. Mexico: legal inside jails, often used also in churches and hospitals. New Zealand: legal inside jails. Norway: illegal to own and operate. The police and the military can use jammers in situations in which it is necessary. Pakistan: legal inside banks, often used also in libraries. Switzerland: illegal. Turkey: illegal. Only the police and the military use jammers. Ukraine: legal, planned to be used in schools United Kingdom: illegal to use, but legal to own. Installation in jails has been proposed United States: Cell phone blocking devices are used by federal officials under certain circumstances. Privacy rights of property owners may affect the policy and application of law within buildings. The FCC may issue a permit that waivers the law for private use. Alternatives to Cell Phone Jamming While the law clearly prohibits using a device to actively disrupt a cell-phone signal, there are no rules against passive cell-phone blocking. That means using things like wallpaper or building materials embedded with metal fragments to prevent cell-phone signals from reaching inside or outside the room. Some buildings have designs that block radio signals by accident due to thick concrete walls or a steel skeleton. Companies are working on devices that control a cell phone but do not jam the signal. One device sends incoming calls to voicemail and blocks outgoing calls. The argument is that the phone still works, so it is technically not being jammed. It is a legal gray area that has not been ruled on by the FCC as of April 2005. Cell-phone alerts are available that indicate the presence of a cell-phone signal. These have been used in hospitals where cell-phone signals could interfere with sensitive medical equipment. When a signal is detected, users are asked to turn off their phones. Cell-phone users dont know theyre being jammed. The phones just indicate that theres no service or no signal from the network. The jammer simply interrupts the phones ability to establish a link with the nearest cell-phone tower. If the battery on your phone is okay, and youd like to continue your conversation, try walking away from the area. You may be able to get out of the jammers range with just a few steps. Every technology has good aspect as well as bad aspect the important thing is, how we are using it. There are some bad aspects of mobile Jammers like, Jamming blocks all calls in the area, not just the annoying ones. Jamming a signal could block the call of a babysitter frantically trying to contact a parent or someone trying to call for an ambulance. Cell Phone Jammers are very useful to society from the antisocial elements. We can save our national leaders. We can restrict the communication network between the anti social elements. Cell phone Jammers prevent the students from carrying cell phones to the college.

A Day Worth Remembering

April 10, 2007 is a day I will never forget. It was the day I gave birth to my son. Beforehand, I thought it would all be a piece of cake, but to my surprise, it was far from that. On my way to a routine check-up, it seemed as if all I was able to think about was how bad my back hurt and that I could not wait to have this baby. I arrived at the doctor’s office and everything seemed to be running smoothly. I sat in the small, cramped room for what seemed like forever after the nurse had gotten my vitals.The doctor finally came into the room and asked me how I was feeling. I informed her that besides the fact that I was wobbling around and carrying an extra 30 pounds, I felt just fine. She then looked at me with a facial expression that had me thinking the worse. She informed me that my blood pressure was through the roof and that they would have to induce my labor. There I was, a first time mom about to go through something that I had never experienced before. Nervous doesnâ₠¬â„¢t even begin to describe the feelings that I was having at that time and moment.I called my husband and informed him that I was being sent to the maternity ward. Calling him did not help me to calm down. To be honest, I think I was calmer than he was which was surprising since he had been through this before. Finally, after all the questions and trying to comprehend what was going on, he was on his way. I was finally taken upstairs to the maternity ward and admitted. Not too long after arriving, I was given Pytocin to get the contractions started, a drug given to speed up the dilation of the cervix, since there was a chance of my son’s heart rate dropping.Shortly after I was examined, I was diagnosed with severe Preeclampsia, a condition in which the blood pressure is significantly high and chances of seizures and liver failure can occur. Not only was I diagnosed with something that I had never heard of with the potential to become fatal, the woman in the next room over t hat was actually giving birth at that time was screaming her heart out. I wanted to dart out of that place. I was beyond terrified. I sat there in a daze for most of the day since I was on so many different medications. You would have never thought that I was in labor because I was hooked up to so many machines.I felt like this was the worst day of my life and swore I would never do it again. The sharp, rushing pains of contractions kept coming, and to me, life as I knew it sucked. Whenever the pain came along, it would be stronger, longer, and more unbearable than the last. This lasted for an eternity in my eyes and I could not wait for it to be over. I eventually made it to the ten centimeters required to deliver. I was almost to the finish line and I was ready for it to be done and over with. With my husband and mother at my side, I felt invincible.They gave me the energy that was necessary to make it through one of the most important days of my life. I had my game face on and no thing stood in between me and giving birth to the son I was dying to meet. I began to push. The first push and I thought my lungs had collapsed. I was determined to end the long journey I had been on for nine months. With the second and last push came a beautiful, little baby boy. All that I had gone through was well worth it and if I had to do it all over again I would. April 10, 2007 was one of the most terrifying but happiest days of my life and I will always remember every detail of it.

A project on night blindness Essay

Introduction: Night blindness also known as Nyctalopia is not a diagnosis, but rather a symptom of an underlying disorder. People with night blindness (also called impaired dark adaptation) see poorly in the darkness but see normally when adequate amounts of light are present. The condition does not actually involve true blindness, even at night. Recovery is fairly rapid when intake is reduced. Night Blindness is commoner than one can expect it to be. Causes: There are many causes of Night Blindness. Night blindness can be linked to a variety of conditions caused by impaired liver function, which in turn reduces vitamin A in the body. Vitamin A deficiency is a common cause for night blindness. Some people are just born with it. Many people who are alcoholics or drink a lot may also get Night Blindness because drinking can damage your liver, which makes it easier to pick up an infection of any kind. Symptoms: Symptoms include difficulty seeing when driving in the evening or at night, poor vision in reduced light. You may have a feeling that your eyes take longer to â€Å"adjust† to seeing in the dark. Initially there is slight difficulty in seeing in dim light later this progresses. The field of vision becomes narrow then later limitations in day vision. If no medication is taken blindness can occur. Toxic symptoms can occur with a large intake of Vitamin A. This is called Hypervitaminosis A, which leads to loss of appetite, a dry, itchy skin often with peeling, intense headaches and an enlarger liver. Typical Sufferers: Night Blindness starts at an early age, around 15 years and progresses into adulthood. Typical sufferers of Night Blindness are the elderly, teenagers and alcoholics. Many younger kids maybe born with night blindness it may  also be an indicator of Retinitis Pigmentosa. Also Night Blindness can also occur if there is a poor intake of Vitamin A. Some people can be born with Night Blindness because it is a genetic disease and runs in families. Treatment: Night Blindness can be treated with therapeutic dosages of the vitamin A. Some types of damage to the retina, such as Retinitis Pigmentosa, are usually irreversible. Many treatments like Vitamin A tablets are being given, but their definite effect has not been documented. Taking supplements of Vitamin A in eye drops is also used to treat Night Blindness. Also just eating healthy and eating more Vitamin A products can improve your eyesight at night, but it is not a permanent cure for Night Blindness. Prevention: Preventions of Night blindness can be a larger intake of Vitamin A. Eating leafy green vegetables such as spinach that is rich in Vitamin A. It contains more vitamin A than most other green vegetables. This vitamin promotes growth and health, specially the health of the eyes. Lack of this vitamin may lead to night blindness. Spinach is thus an effective food remedy for the prevention and treatment of night blindness. Also eating animal livers, milk, and yellow vegetables can improve the intake of vitamin A in your body. These vegetables, which contain carotene, that is a chemically related substance that is converted to vitamin A in the body. Conclusion: If you think you might have Night Blindness and are seeing some of the symptoms you should start eating more Vitamin A. Having too much vitamin A can be bad for your body, because Vitamin A is one of the few vitamins in which excess produces definite and severe effects. Recovery is fairly rapid when intake is reduced. There are many varieties of Night Blindness, some begin earlier and progress faster. Night Blindness is serious and is commoner than one can expect it to be! Bibliography Gottlieb, William. The Doctors book of home remedies. Prevention Magazine Health Books. 2000. Ch. 99 Medical Encyclopedia. 20 Feb. 2003 Night Blindness. 20 Feb. 2003 Night Blindness Gene. 16 Feb. 2003 Upgren, A.R. Night Blindness: Light pollution, the environment, and our experience of nature. The Amicus Journal Winter. 1996. Pp. 22-25 Vitamins. 16 Feb. 2003

Has Imperialism Ruin The Name Of The U.S. - Free Essay Example

Sample details Pages: 1 Words: 372 Downloads: 10 Date added: 2019/04/15 Category Politics Essay Level High school Tags: Imperialism Essay Did you like this example? The United States are using imperialism, extending the influence of a nation by economic, political, or military means, in order to get what they want from other lands. This topic is circulating the world to the power countries. But are the benefits of expansion worth whats costing us as a country? Its simply not worth it since its sacrificing out countries basic ideals, and the lives of our people. People are arguing whether its a good idea or not, but the negative of imperialism is outweighing the good it does. As were strengthening our foreign affairs, the economy has weakened since many of our citizens are losing their jobs and taxes increased for the wars were fighting. The United States used imperialism to buy Panama in order to have a naval power, but has lead us to enormous war hunger such as the war in Panama. Imperialism has been tarnished by the national disasters. Since our war with the Philippines, imperialism cost the U.S. lives and an eruption into a bloody war. Don’t waste time! Our writers will create an original "Has Imperialism Ruin The Name Of The U.S." essay for you Create order Imperialism has challenged our own principles when we became an independent country. It is an affliction on our constitution, what we stand for as a country, liberty and justice for all. We have taken the freedom of other weak countries: Philippines,China, Hawaii, and so on, that we have truly lost our own principles. We have revealed the ability of being good to be so corrupted. The U.S. have earned the title of becoming a world power, but will it give us the lives that have been lost and the dignity the country lost for being liars and tormenting other countries. As a nation, willing to sacrifice our principles, will lead us to more disaster and enemies against good countries. The U.S. wanted to conquest imperialism even if it meant going against the beliefs as nation of under God for Liberty and Justice for all The U.S. shouldnt have suppressed the weak and tell the benefits of such a catastrophe. In the end of imperialism of the U.S. it didnt justify what they have done. We must not allow this to get lost in history or it might end up repeating itself for the worst.