hi there ,
I read yesterday about portable Cell Phone Jammers ( http://forums.techarena.in/portable-devices/1021332.htm ) ,now i am interesting to know about is that really working this way and how ?? and is it LEGAL thing to handle ??
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hi there ,
I read yesterday about portable Cell Phone Jammers ( http://forums.techarena.in/portable-devices/1021332.htm ) ,now i am interesting to know about is that really working this way and how ?? and is it LEGAL thing to handle ??
Most jammers only have a range of about 50 to 80 feet and will only effectively jam your immediate surroundings.
Stronger jammers are available to cover larger structures like office buildings, movie theaters and churches. They look like a miscellaneous metal boxes with wires sticking out and are usually mounted on walls or ceilings
Most cell phone jammers come in 2 versions, one for Europe, North Africa and the Gulf states GSM networks (900 & 1800) and one for the Americas & Canada (800 & 1900 mhz) networks
Jammers are typically used by the police and military to control or disrupt communication during hostage situations and bomb threats and its illegal to sell jammers .
LOCATION United States
LEGAL FOR CIVILIANS TO OWN No
LEGAL TO SELL Not to US civilians. Only to US government agencies or countries with US State Department approval.
LOCATION Europe
LEGAL FOR CIVILIANS TO OWN No
LEGAL TO SELL Not to civilian customers in any European Union country. Only to government personnel.
LOCATION Asia
LEGAL FOR CIVILIANS TO OWN Mostly yes, but may vary from country to country
LEGAL TO SELL Mostly yes, but may vary from country to country
Inside 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
* RF amplification - Boosts the power of the radio frequency output to high enough levels to jam a signal
Power supply
Smaller jamming devices are battery operated.
in many countries, it's illegal. a cell phone jammer is a device which is efficient in blocking the transmission of signals between the cell phone and its nearby base station