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How to make a homemade cell phone jammer



Как сделать самодельный глушитель сотовых телефонов


After searching how to make a cell phone jammer , I found what I was looking for in a blog post from the Jammer Store Inc team.

After reading it, I managed to make my own silencer mobile .

Sorry for the poor translation;)

These home-made devices are illegal in some countries, therefore, you use this instruction at your own risk.

Technical details

Most cell phones use the GSM800 standard for mobile communications; therefore, VCO (wide oscillator), we adjust the frequency range to 800 MHz. It can be quite difficult to set up work properly without some skills and a good testing tool, but as a result you will have an effective VCO. (Many cell phones use GSM800 mobile standard to operate, thus my VCO (sweeping oscillator) is tuned to the 800 MHz frequency range. It may be quite difficult to make this one to work properly without some skills and good testing tools, but in result you will have the efficient VCO.)

I use a 45MHz clock as a noise and interference generator. This triggers the local oscillator port, which is located in the mixer. The signal comes from the oscillator and passes through the network resistance in its path. This allows you to equate the resistance of the 45 MHz clock oscillator with the resistance of the mixer port. (I used clock oscillator for 45MHz as the noise generator for this jammer. It drives the local oscillator port which is located at the mixer. The signal is going out from the local oscillator and passes through the impedance matching network along its way. This helps equate the impedance of 45MHz clock oscillator with the impedance of the mixer's port.)

This port acts as an RF interference signal input. The RF signal passes through the output amplifier to a mini circuit. Output power is increased by an additional 15-16dBm. Then the output signal goes to the output of the RF antenna. The RF input also has an antenna. (This port acts like RF input of the signal jammer. The RF output signal passes through the amplifier on the mini-circuit. The output power is increased by additional 15-16dbm in this way. Then the output signal goes to the RF output antenna . RF input has the antenna too.)

Using Jammers

Why did I choose a 45 MHz clock? Because the GSM800 standards of transmitted and received signals are always separated by the exact number of frequencies and this is what 45MHz. Now imagine: A phone user dials someone and the signal goes off. This signal has the frequency of the received signal of the cell phone, so the cell phone user will hear their own voice in the phone! :) (Why I chose 45MHz clock oscillator? Because GSM800 band transmitted and received signals are always separated by the exact number of frequency and it is that 45 MHz. Now picture this: cell phone user dial someone and signal goes off. RF input antenna catches it and jammer modifies this signal and lets it go. This signal have a frequency of cell phone's received signal, so cell phone user would hear his or her own voice in a phone! :) )

I must mention that this particular cell phone jammer can be used to block the signal of a cell car’s tracking device, which captures your GPS data and sends it to some bad guys. And it probably can even jam some IED signals if they are under the control of a GSM800 group mobile phone. (I should also mention that this particular cell phone jammer might be used to block the signal of the cell-based car tracking device which records your GPS data and sends it to some bad guys. And it probably can even jam some IED signals if they are controlled by cell phone GSM800 band.)

But I hope that there will be no situation in this life when this function will be necessary for me, or you, or someone else. (But I hope that there be no situation in this life when that feature will be needed by me, or you, or anyone else.)

Photos and descriptions

Как сделать самодельный глушитель сотовых телефонов
A used mixer was originally made for 600 MHz, but I changed it a bit and it works great at 800 MHz. (Used mixer was originally made for 600MHz but I modified it a little and it works perfectly for 800MHz.)

Как сделать самодельный глушитель сотовых телефонов
An amplifier does fantastic things with power output. Despite this attracting extra nutrition, it's worth it. (The amplifier makes fantastic thing with output power. Despite it draws additional power supply, it is worth it.)

Как сделать самодельный глушитель сотовых телефонов
The jammer case was made from an old aluminum window and the UHF connectors I took from my old Motorola phones. (Jammer case was made from old aluminum box and UHF connectors I took from my old Motorola phone.)

Как сделать самодельный глушитель сотовых телефонов
These connectors must be soldered to the mini circuit to work properly. (Those connectors must be soldered to the mini-circuit to work properly.)

Как сделать самодельный глушитель сотовых телефонов
To ensure this little interference, a nine-volt battery signal with a voltage regulator is enough. I separated it from other electronic components with polystyrene foam. (To supply this little signal jammer the nine volts battery with voltage regulator is enough. I have separated it from other electronic components with foam plastic.)

Как сделать самодельный глушитель сотовых телефонов
Remember to make a power switch for your new creation. Oh, and attach the antennas to the UHF connectors. (Don’t forget to make a power switch for your new creation. Oh, and attach antennas to the UHF connectors.)

Как сделать самодельный глушитель сотовых телефонов
So it’s ready! Use it wisely;) (So it is ready! Use it wisely;))

Jammer circuit

Как сделать самодельный глушитель сотовых телефонов