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STD signal jammer advanced

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Update time: 2021-10-19 16:17:02
Creation time: 2021-09-18 15:56:54
Description

Communication jamming devices were first developed and 
used by military. This interest comes from the fundamental objective 
of denying the successful transport of information from the sender 
(tactical commanders) to the receiver (the army personnel), and viceversa. Nowadays, mobile (or cell) phones are becoming essential tools 
in our daily life. Here in Jordan, for example, with a rather low 
population (around 5 million), three main cell phone carries are 
available; namely; the first two use the GSM 900 system, while the 
third uses the GSM 1800 system. Needless to say, the wide use of 
mobile phones could create some problems as the sound of ringing 
becomes annoying or disrupting. This could happen in some places like 
conference rooms, law courts, libraries, lecture rooms and mosques. 
One way to stop these disrupting ringings is to install device in such 
8
places which will inhibit the use of mobiles, i.e., make them obsolete. 
Such a device is known as cell phone jammer or "GSM jammer", which 
is basically some kind of electronic countermeasure device. 
 The technology behind cell phone jamming is very simple. The 
jamming device broadcasts an RF signal in the frequency range 
reserved for cell phones that interferes with the cell phone signal, 
which results in a "no network available" display on the cell phone 
screen. All phones within the effective radius of the jammer are 
silenced. It should be mentioned that cell phone jammers are illegal 
devices in most countries. According to the Federal Communications 
Commission (FCC) in the USA: "The manufacture, importation, sale, or 
offer for sale, of devices designed to block or jam wireless 
transmissions is prohibited". However, recently, there has been an 
increasing demand for portable cell phone jammers. We should 
mention that this project, presented in this report, is solely done for 
educational purposes. There is no intention to manufacture or sell 
such devices in India, or elsewhere. In this project, a device that will 
jam both GSM 900 and GSM 1800 services will be designed, built, and 
tested. 

Design Drawing
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ID Name Designator Quantity
1 VDD #PWR1 1
2 4.7 pF C1 1
3 3.3pF C2 1
4 47pF C3 1
5 2pF C4 1
6 4.7pf C5 1
7 30pF C6 1
8 1.1nH L1,L2 2
9 LED LED1 1
10 2N2222 Q1 1
11 82k R1 1
12 6.8k R2 1
13 10k R3 1
14 220 R4 1
15 5.6K R5 1
16 3.9k R6 1
17 NE555P U1 1
18 12v V1 1
19 Multimeter XMM1,XMM2 2
20 Oscilloscope XSC1,XSC2 2

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