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| cellphone mobile jammer Note: In many countries it is illegal to possess this kind of equipments. |
A mobile phone jammer is an instrument used to prevent cellular phones from receiving signals from base stations. When used, the jammer effectively disables cellular phones. These devices can be used in practically any location, but are found primarily in places where a phone call would be particularly disruptive because silence is expected.
They send out radio waves along the same frequencies that cellular phones use. This causes enough interference with the communication between cell phones and towers to render the phones unusable. On most retail phones, the network would simply appear out of range. Smaller handheld models block all bands from 800 MHz to 1900 MHz within a 30-foot range (9 meters).
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
Product description of one such items is given below:
Product Name : Signal Jammer DZ-101P-B
To be suitable for gas station and other place which need to prevent from explode.
1. TX-Frequency:
(A)TX-Frequency: 870-880MHz
(B)TX-Frequency: 935-960MHz
(C)TX-Frequency: 1805-1850MHz
(D)Tx-Frequency: 3G 2110-2170MHz or PCS 1930MHz
Available System: GSM, CDMA, DCS, 3G, PCS and PHS
2. Total Output Power: 10w
3. Jamming Radius: 2-50 meters depends on -75dBm
4. Antenna: 4PCS Omni-directional antennas
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