Where can cell phone signal jammer devices be used

There have been several fires across the country caused by the use of mobile phones. A gas station exploded when its driver used his mobile phone while filling up the gas, causing many people to die.

According to the upstream and downstream channels of the mobile phone system, the shielding frequency of 4G jammer is analyzed by using the techniques of frequency doubling, frequency division and frequency hopping filtering.

According to the power size of the shielding device, a spherical shielding space is customized to automatically form a shielding magnetic field within the specified range, making mobile phones fail in this space.

When the jamming device is in working state, it can make the mobile phone transceiver signal function within the specified range fail, unable to dial out and dial in, so as to achieve the purpose of mandatory prohibition.

It can be used in various places such as examination room, meeting room, gas station, oil depot, church, hospital, court, military center, library, movie theater, etc.

Why do gas stations need signal blocker?

There have been several fires across the country caused by the use of mobile phones. A gas station exploded when its driver used his mobile phone while filling up the gas, causing many people to die.

When the phone's battery starts up and the bell rings, a satisfying energy spark that causes a slight spark may cause a fire. For the safety part, it has been a long time since the regulation of petrol stations to stop the use of mobile phones was put in place, but now the performance is not satisfactory.Gas station equipment is controlled by computer, wifi jammer affects the normal operation of equipment, causes the banning of measurement, more important is that mobile phone in the process of call can present a spark, vulnerable to fire, gas station blasting. Installing mobile phone jammers at gas stations could prevent some tragedies.

As a result, the gas station that belongs to the fire prevention heavy ground not only stops the use of mobile phones in the station, but also is best not to use mobile phones within two or three meters around the gas station.

Reference:

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4G LTE cell phone jammer have become the mainstream of market demand

Cell phone jammers have been around since 1998. The devices can block signals in a room about the size of a movie theater. The jammer sends out a low-power, encoded radio signal or modulated radio wave.

WiFi signal jammer work in one of two ways. Some devices set their signal to the same frequency as pagers and mobile phones, cutting off communication between handsets and base stations. Others work as electronic filters that fool mobile phones into thinking there are no frequencies available to make or receive calls. Manufacturers of the devices say the jamming only affects the designated area (most radii are a couple dozen to several hundred feet) and works only on cellular transmissions.

As you know 4G LTE is a totally new signal of communication area. In recently market, there are little jammer can block its frequencies. Now the Perfectjammer's new electronic device will help you to achieve the goals. Furthermore, it not only blocks the latest 4G LTE frequencies, but also jams other frequencies. Having a compact device, all signals can be block in your hands. The small and compact device is easy to carry.Like a small cell phone, you can put it into your pocket and any bags.

The tide, however, may be changing. This past spring, both Hong Kong and Canada announced they would consider legalizing jammers in an effort to curb bad phone behavior in public. Around the same time, the leaders of India's parliament revealed they had already installed the devices to avoid interruptions during sessions.

Communication GPS signal jammer technology from Russia

The Russians began jamming some smaller U.S. drones several weeks ago, the officials said, after a series of suspected chemical weapons attacks on civilians in rebel-held eastern Ghouta. The Russian military was concerned the U.S. military would retaliate for the attacks and began jamming the GPS systems of drones operating in the area, the officials explained.

Jamming, which means blocking or scrambling a drone's reception of a signal from a GPS satellite, can be uncomplicated, according to Dr. Todd Humphreys, the director of the Radionavigation Laboratory at the University of Texas at Austin.

Source:

https://propertibazar.com/article/cell-phone-jamming-will-in-school-us_5b3ae0330bac36bd758b4567.html

http://luckyforum.org/blogs/the-threat-from-wireless-signal-jamming/57562-threat-from-wireless-signal-jammer

http://www.facecool.com/profiles/blogs/the-threat-from-wireless-signal-jamming

GPS signal jammer are used in battlefield applications

The recent reports out of Syria highlight the inclusion of these in an evolving battlespace. One of the simplest threats to drones is the blocking or scrambling its reception of a signal from a GPS satellite. This “GPS jamming” can produce serious operational impact on military mission and will likely become more and more prevalent. According to a piece by NBC, Russians are using GPS jamming against the U.S. military’s smaller surveillance aircraft.

The Systems Tool Kit (STK) has a quick tutorial that demonstrates how to determine if a small, hand-held GPS jammer can interfere with your mission. One can also determine how spectrum filters or phased array adaptive nulling can counter this, or design new systems as other phenomenologies to get positioning, such as celestial navigation, that operate in these denied environment.

The concern comes as civilian aviation and communications systems have repeatedly been jammed in connection with nearby Russian military activities.

The situation was similarly serious in September 2017, when airliners from companies SAS and Widerøe in periods had to navigate with the help of radio signals due to loss of GPS when they entered the East Finnmark airspace. The jamming coincided with the major Russian military exercise «Zapad».

WiFi signal jammer are easy to buy

The GPS signal jammer works by sending out its own signal on the same frequency as the GPS unit, a noisy signal that prevents it from receiving or transmitting any useful information, either in bursts of sound or a continuous wave. 

The fact that GPS cell phone jammer can be bought openly on the internet shows that most countries are prepared to live with the problem. Currently, in internet, it is very easy to find not only jamming but also spoofing equipment available for buying. These equipments are not so expensive, being available in any quantity that one needs. Besides, a several number of tutorials can be found on websites and YouTube, teaching how to spoof and jam vectors, especially drones. It is just to "google it" and one finds security experts raising alarm over how to hack drones

Jamming is defined as "the emission of radio frequency with enough power and with the features needed to prevent, in a given area, the receivers to track GPS signals"

The low power that GPS signals arrives to the receivers allows the power of the jammer to be effective even at very low power levels, making interference in GPS relatively simple and inexpensive to carry out. Various jamming methods are available in the market, being possible to find very efficient ones for $ 1,000.00, which are capable of delivering at least 100 watts (Rrol 2003).

When evaluating the influence of a jammer on a receiver, one should use the J/S relationship (jamming/signal). When expressed in dB, it is the difference between the power of the interfering signal and power of the received one.

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