Hello everyone,
While I was surfing the web I stumbled upon this simple mobile jammer circuit
According to the designer, it is supposed to block 450 MHz signals, however, after doing the calculations (f=1/[2*pi*sqrt(LC)]), I found that it jammed 277 MHz signals instead. Am I right?
Also, the transistor Q1 is drawn is a pnp transistor but according to the datasheet of the BF494, it is a npn transistor.
Can anyone suggest a good reference for RF amplifier circuits like this one?
Finally, this circuit is designed to block only one frequency, is that enough to jam a phone's signal? (for example, GSM-900 frequencies range from 890 to 960 MHz).
This project is for academic purposes only, I am fully aware of the laws prohibiting the use of such devices in some countries, I simply wish to expand my knowledge in this area.
Thank you in advance
While I was surfing the web I stumbled upon this simple mobile jammer circuit
According to the designer, it is supposed to block 450 MHz signals, however, after doing the calculations (f=1/[2*pi*sqrt(LC)]), I found that it jammed 277 MHz signals instead. Am I right?
Also, the transistor Q1 is drawn is a pnp transistor but according to the datasheet of the BF494, it is a npn transistor.
Can anyone suggest a good reference for RF amplifier circuits like this one?
Finally, this circuit is designed to block only one frequency, is that enough to jam a phone's signal? (for example, GSM-900 frequencies range from 890 to 960 MHz).
This project is for academic purposes only, I am fully aware of the laws prohibiting the use of such devices in some countries, I simply wish to expand my knowledge in this area.
Thank you in advance
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