FAQ - GSM-900 Mobile JAMMER : Signal Jammers | Signal Blockers | Signal Jamming Device | Signal Blocking Device

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Home > FAQ > News > GSM-900 Mobile JAMMER

[News] - GSM-900 Mobile JAMMER

INTRODUCTION
A GSM Jammer is a device that transmit signal on the same frequency at witch the GSM system operates, the jamming success when the m obile phones in the area where the jammer is located are disabled.
Communication jamming devices were first develop ed and used by military. Where tactical commanders use RF communications to exerci se control of their forces, an enemy has interest in those communications. This interest comes from the fundamental area of denying the successful transport of the information from the sender to the receiver. Nowadays the mobile jammer devices are becoming civ ilian products rather than electronic warfare devices, since with the increasi ng number of the mobile phone users the need to disable mobile phones in specific place s where the ringing of cell phone would be disruptive has increased. These places inc lude worship places, university lecture rooms, libraries, concert halls, meeting ro oms, and other places where silence is appreciated.
Mosques are example for the places were mobile j ammer would be a great solution, although mosques asks politely from prayers to disa ble their mobile phone during the prayer ,see figure (1), some people forget and the ringing phone of their mobile phone become very annoying specially during the praying t ime.
Mobile Jamming and Disablers Techniques
There are different approaches to prevent mobile p hones from ringing in specific area, the main five approaches used or being developed ar e described in RABC Mobile & Personal Communications Committee’s (M&PCC) meeting of June 22, 1999 [1], these techniques are summarized in this section :
1- Type "A" Device
In this device we overpower cell phone's signal with a stronger signal , This type of device comes equipped with several independent o scillators transmitting ‘jamming signals’ capable of blocking frequencies u sed by paging devices as well as those used by cellular/PCS systems’ control chan nels for call establishment. When active in a designated area, such devices will (by means of RF interference) prevent all pagers and mobile phones located in tha t area from receiving and transmitting calls. This type of device transmits o nly a jamming signal and has very poor frequency selectivity, which leads to interfer ence with a larger amount of communication spectrum than it was originally inten ded to target. Technologist Jim Mahan said, “There are two type s. One is called brute force jamming, which just blocks everything. The problem is, it’s like power-washing the airwaves and it bleeds over into the public broadca st area. The other puts out a small amount of interference, and you could potentially c onfine it within a single cell block. You could use lots of little pockets of smal l jamming to keep a facility under control.”
2- Type "B" Device
This device also called "Intelligent Cellular Dis ablers devices", and it does not transmit an interfering signal on the control chann els. The device basically works as a detector, and it capable to communicate with the cellular base station. When the device detects the presence of a mobile phone in th e "silent" room; a prevention of authorization of call establishment is done by the software at the base station. The device signals the base station that the target use r is in a ‘quiet’ room; therefore, do not establish the communication. Messages can be ro uted to the user’s voice- mail box, if the user subscribes to a voice- mail servic e. This process of detection and interruption of call establishment is done during t he interval normally reserved for signaling and handshaking.
This intelligent device as it’s name imply can re cognize emergency calls and also can allow specific pre-registered users to use thei r mobile phones for a specified duration. Although this device sounds the best solu tion for disabling mobile phone, a provision is needed by the cellular/PCS service p roviders or provision by a third- party working cooperatively with full support of th e cellular/PCS service providers, allowing the detector device to be integral part of the cellular/PCS systems.
3- Type "C" Device
This device also called "Intelligent Beacon Disa blers ", as in the type "B" device it does not transmit an interfering signal on the cont rol channels.
The device, when located in a specific "silent" room, functions as a ‘beacon’ and any compatible terminal is ordered to disable its r inger or disable its operation. In the coverage area of the beacon only terminals whic h have a compatible receiver would respond and this should be built on a separat e technology from cellular/PCS, for example Bluetooth technology. Also the handset must re-enable its normal function as it leaves the coverage area of the beac on.
The need for intelligent handsets with a separat e receiver for the beacon receiver from the cellular/PCS receiver, make effective depl oyment for the type "C" device will be problematic for many years.
4- Type "D" Device
This jammer is similar to type "A" , but with a receiver, so that jammer is predominantly in receive mode and when the device d etects the presence of a mobile phone in the "silent" room; it will intellig ently choose to interact and block the cell phone by transmitting jamming signal. This jam signal would only stay on as long as the mobile continues to make a link with the base station; otherwise there would be no jamming transmission.
Thus this device much less electromagnetic pollu tion in terms of raw power transmitted and frequency spectrum from the type "A " Jammer, and therefore much less disruptive to passing traffic. This technique could be implemented without cooperation from PCS/cellular providers. Also this technique has an added advantage over Type B in that no added overhead tim e or effort is spent negotiating with the cellular network.
5- Type "E" Device
This technique is using EMI suppression techniqu es to make a room into what is called a Faraday cage. Although labour intensive to construct, the Faraday cage essentially blocks, or greatly attenuates, virtuall y all electromagnetic radiation from entering or leaving the cage or in this case a tar get room.
With current advances in EMI shielding techniques and commercially available products one could conceivably implement this into the architecture of newly designed buildings for so-called “quiet-conference” rooms.
Emergency calls would be blocked unless there w as a way to receive and decode the Emergency Call transmissions, pass by coax outs ide the room and re- transmitted.
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