So when you get the noise, you can only hear your voice and you can't hear someone else's voice on the phone. First of all, how does a cellphone jammer interfere with a cell phone? It turns out that the jammer achieves interference by preventing the mobile station from receiving the signal from the base station.
This cell phone jammer works at the GSM800 frequency because most mobile phones use it to operate. So the choice of VCO is a scanning oscillator, but it can be a bit difficult for a beginner who doesn't have a good radio frequency test device. As a source of noise, you can use the 45MHz clock oscillator to drive a local oscillator port on a microcircuit mixer. There is also an impedance matching network that enables local oscillator signals to pass through it. It is used for the impedance and mixer ports of the equivalent clock oscillator. The RF input (which is the port of the mixer) connects to the first 800MHz cellular telephone antenna, and the RF output is sent to the microcircuit amplifier. The amplifier increases the output power by 15-16 DBM. Then the amplified signal is sent to the second cellular telephone antenna.
All cellular phones using GSM800 are always 45MHz apart. So when the phone tries to call, it is prevented from returning by its own signal! When the phone has annoyed you - open your jammer, the criminal will hear his voice on his or her cell phone. By the way, you can also use this mobile signal jammer to block any unit based tracking system, using your GPS tracking and recording your car's movements. And it is likely to block ieds that are detonated using cellular phones. The use of a mixer designed to work as high as 600MHz is quite good in this case. The radio frequency amplifier does exactly what it does, but absorbs additional power.
Use the old aluminum box as the frame, the jammer and the old UHF connector as input/output.
Connect the RF connector to the circuit
Use 9-volt battery and voltage stabilizer to power all components, place the battery inside, and separate the foam from other components, and place the power switch on top
Screw the input and output antenna into the UHF connector.
The phone jammer has been finished, and the noise source can be tested.