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How to Make a Radio Frequency Jammer- A DIY Radio Jammer Guide

Radio signals are essential for communication. Nonetheless, there are scenarios whereby you may not want frequencies from a radio transmitter to reach a particular receiver. Our article explores how to make a radio frequency jammer by exploring the basics of an RF jammer circuit.  

What Do You Need to Make a Radio Frequency Jammer

Figure 1: A Satellite receiver

A jamming circuit is imperative when you intend to block radio communications from reaching a particular receiver. Thus, it also prevents the misuse of flux and solder. To make this component, you require the following components: 

  • A heatsink
  • A flyback driver
  • Hard paper
  • Glue 
  • Paraffin Wax

Radio Frequency Jammer Circuit Design

Check out the circuit diagram below.

A Radio Frequency Jammer Circuit Diagram

Figure 2: A Radio Frequency Jammer Circuit Diagram

Circuit Explanation

A simple jammer circuit can provide perfect jamming of a wide range of radio frequency signals between 5-10 meters. An ideal radio frequency jamming equipment features 22pF trimmers to facilitate effectively blocking the RF noise signal. 

Secondly, it should cover the frequency range of 50 MHz to 1Ghz. However, compelling it to jam signals from a frequency range of 500 MHz will most likely cause stability issues.  

How to Make a Radio Frequency Jammer

A telecommunications Tower

Figure 3: A telecommunications Tower

The following are the critical steps to making a practical radio jammer kit/ RF signal jammer circuit. 

Make the driver circuit.

  1. First, you must wind the primary coil and the secondary coil in the same way. Also, installing a fast diode that will shield the transistor from a voltage surge and voltage drop is imperative. 
  2. Next, you must also use a relatively large heatsink. A small heatsink induces heating of the transistor within a short period. 
  3. Besides, ensure you don’t use solder to connect the flyback circuit’s primary and secondary coils to the driving circuit. Instead, use screws as this will aid the installation of different flybacks. 

Flyback Preparation

  1. Create a rigid paper cylinder, and connect the primary and secondary coils using glue. 
  2. During the above process, ensure the ferrite cores are placed correctly with plastic plates between them. It will significantly reduce the ultrasound vibrations.
  3. Ideally, your coil should measure 1mm in thickness and 0.1 mm for the magnetic wire. Also, ensure the windings lack an internal arc. Besides, it is imperative to presoak your coil in paraffin wax. 
  4. On average, the secondary will give 8 – 9 mm sparks, requiring a 20W power supply to function.
  5. If you intend to have more wattage on the secondary, ensure you use a thing secondary. The secondary voltage, in this case, will be too much for the primary coil. Besides, It’s also advisable to use epoxy rather than paraffin as it’s more resistant to melting. 

Input the Antenna

A transmitter antenna icon

Figure 4: A transmitter antenna icon

  1. Before installing the antenna, the sparks are 2-3 mm. Nonetheless, using an antenna measuring 2 meters will increase the spark length to approximately 8mm due to the voltage drop. 
  2. This pre-made jammer will operate at a range of 10-15 meters. But for an RF jammer compatible with longer ranges, you can increase the length of the antenna. 
  3. Besides, note that there’s a significant likelihood of MW noises at longer distances. But, the VHF noise is most prevalent at a range of 8-10 meters. 
  4. If you want to extend the homemade RF signal jammer range, apply secondary coils. Also, boosting the functioning of performance drivers can significantly improve the radio frequency jamming system. 

How to Peak the Resonance

You can achieve the peak resonance of the jammer via the following key steps: 

  1. First, attach a DC voltmeter onto the point test and groundline. The ideal voltmeter for this function is one measuring 0 -10 volts. 
  2. Next, tinker with the 22p trimmer till you obtain a maximum meter reading of 3V. Note that this change may impact the initial frequency of the jammer. 
  3. Hence, fine-tune the 22p trimmer to shift the obtain back to its proper frequency.

RF Jammer Coil Specifications

Your RF jammer is a complicated device and may not be compatible with other frequencies. Thus, to change this, you need to tweak the diameter and number of coils of the primary and secondary coils. Also, tinkering with the adjacent trimmers is a prerequisite for efficient jamming of the circuit.

Also, it is advisable to use a high-quality PCB in constructing your RF jammer. 

Bonus Tips & Knowledge About Radio Frequency Jamming System

There’s limited use of radio frequency jamming devices in Europe, while in countries such as the US, they are banned. However, some nations have no laws governing these digital devices. 

All in all, some manufacturers are already making electronic devices for RF jamming purposes. It is irrespective of the common notion that the devices are not suitable. But despite the reservations jamming equipment is necessary as it has a variety of applications.

Radio Frequency Jamming APP

Figure 5: Using an RF Jamming App

Numerous models of cell phone jammer applications are handy in detecting the presence of jamming devices. In the company of a jamming device, a mobile cell phone or similar electronic gadgets cannot make a call as it impacts the cell phone receiver. 

Thus, installing such an app keeps you aware of the influential radio frequency jammer devices in your vicinity. 

 Conclusion

As highlighted in this article, you can easily create a jammer circuit to prevent the malicious interference of radio frequencies. That’s all for now but for additional inquiries, contact us

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Hommer Zhao
Hi, I am Hommer, the founder of WellPCB. So far, we have more than 4,000 customers worldwide. If you have any questions, you can feel free to contact me. I really appreciate any help you can provide.

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