02-03-2013, 02:24 PM
REPORT ON CELL PHONE JAMMER
[attachment=52425]
ASTRACT
The Cell phone jammer unit is intended for blocking all mobile phone types within designated indoor areas. Its unique design strict compliance with international standards of safety and electromagnetic compatibility (ISM).
The Cell Phone Jammer is a 'plug and play' unit, its installation is quick and its operation is easy. Once the Cell Phone Jammer is operating, all mobile phones present within the jamming coverage area are blocked, and cellular activity in the immediate surroundings (including incoming and outgoing calls, SMS, pictures sending, etc.) is jammed.
WORKING
The heart of the system is the RF oscillator .The frequency of the oscillator is 900 MHz.. This is the carrier frequency of the jammer. This frequency is modulated by the modulating signal given to the base of the transistor and the modulated output is obtained across the collector terminal. This modulated output is connected to the antenna, which converts the electric signal into electromagnetic signal and transmits it into the space.
The receiver, which is the cell phone in our case, receives the transmitted signal and tries to demodulate the signal. Since this signal is not within the bandwidth of the cell it displays "Network Busy" on the LCD panel. Since the power of the transmitter is greater than the original signal transmitted from the cell phone tower the cell phone will not respond to the original signal.
Inside a Cell-phone Jammer
Electronically speaking, cell-phone jammers are very basic devices. The simplest just have an on/off switch and a light that indicates it's on. More complex devices have switches to activate jamming at different frequencies. Components of a jammer include:
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.
RF Oscillator
The heart of the system is the RF oscillator .The frequency of the oscillator is 900 MHz.. This is the carrier frequency of the jammer.
[attachment=52425]
ASTRACT
The Cell phone jammer unit is intended for blocking all mobile phone types within designated indoor areas. Its unique design strict compliance with international standards of safety and electromagnetic compatibility (ISM).
The Cell Phone Jammer is a 'plug and play' unit, its installation is quick and its operation is easy. Once the Cell Phone Jammer is operating, all mobile phones present within the jamming coverage area are blocked, and cellular activity in the immediate surroundings (including incoming and outgoing calls, SMS, pictures sending, etc.) is jammed.
WORKING
The heart of the system is the RF oscillator .The frequency of the oscillator is 900 MHz.. This is the carrier frequency of the jammer. This frequency is modulated by the modulating signal given to the base of the transistor and the modulated output is obtained across the collector terminal. This modulated output is connected to the antenna, which converts the electric signal into electromagnetic signal and transmits it into the space.
The receiver, which is the cell phone in our case, receives the transmitted signal and tries to demodulate the signal. Since this signal is not within the bandwidth of the cell it displays "Network Busy" on the LCD panel. Since the power of the transmitter is greater than the original signal transmitted from the cell phone tower the cell phone will not respond to the original signal.
Inside a Cell-phone Jammer
Electronically speaking, cell-phone jammers are very basic devices. The simplest just have an on/off switch and a light that indicates it's on. More complex devices have switches to activate jamming at different frequencies. Components of a jammer include:
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.
RF Oscillator
The heart of the system is the RF oscillator .The frequency of the oscillator is 900 MHz.. This is the carrier frequency of the jammer.