How to Make a Radio Frequency Jammer? – Beginners Tutorial

A radio frequency jammer (or RF jammer) prevents radio communications from contacting a receiver.

Circuits to limit improper usage of solder or flux are way overdue. As a consequence, understanding how to make a radio frequency jammer can save your time and keep you safe under a lot of circumstances.

To create the RF jammer, you need to follow these steps:

What Do You Need to Make a Radio Frequency Jammer


To make a frequency jammer, make sure that you include everything in this checklist of FM radio jammer kit:

  • A flyback driver
  • A large heatsink
  • Hard paper
  • Paraffin wax
  • Glue

RF Jammer DIY Design

Generally, a basic DIY RF jammer circuit can jam all sorts of radio frequency signals within a 5 to 10-meter distance.

The circuit may become suitable for jamming any desired frequency by using different combinations of L1/L2 and adjusting the 22pF cutters.

This circuit may jam frequencies ranging between 50 MHz and 1 GHz. It can also adjust to frequencies greater than 500 MHz, but the circuit might get considerably more complex in this situation.

Because higher frequencies demand shorter connections, the RF circuit’s parameters become more essential. The shorter links may also cause a variety of stability issues.

Notably, you can use this design to jam radio stations that are broadcasting at a radial range of 40 meters or even more.

How to Make a Radio Frequency Jammer


Now, let’s make an RF jammer DIY device with 3 steps below:

Step 1: Construct the driver circuit

You need to wind the feedback and primary coils in the same manner. Also, utilize a fast diode to safeguard the transistor from sudden increases in voltage.

Employ a large heatsink. The driver we use is a prototype with a tiny heatsink, which causes the transistor to become hot fast.

The secondary and primary of the flyback circuit aren’t connected to the driving circuit with solder. Instead, you have to use screws to attach them, enabling the later installation of various flybacks. An old black-and-white TV flyback converter is necessary for this step too.

Step 2: Build the flyback

Remove the flyback’s primary main coil.

Prepare a little hard paper tube and use glue to adhere the secondary and primary coils to it. Then, insert the secondary coil and the new primary one, as well as the feedback.

When constructing the flyback, make sure the ferrite cores are in the right place, and the plastic plates stay in between them. The ultrasound vibrations may decrease in this way.

The coil should be 1 mm thick, while the magnet wire is much thinner, about 0.1 mm thick. There should be no internal arc between the windings. Also, you need to infuse the coil with paraffin wax.

The flyback generates 8 to 9 mm sparks (during operation, it may extend up to 20mm). It needs a 20W power source to function.

A handmade thin secondary is advisable if you plan to put more watts into your flyback because excessive secondary voltage can quickly damage the primary coil. Your coil can’t be thicker than 1 mm! Plus, employ epoxy instead of paraffin wax in this situation, since paraffin is easy to melt.

Attach three coils in combination to achieve a greater voltage. On the internet, there are several instructions for creating handmade flyback coils.

Step 3: Add the antenna

The sparks are about 2-3 mm apart, and a 2-meter wire serves as the antenna. The spark length may decrease from 8 mm to 2 or 3 mm due to the voltage fall produced by the antenna.

The jammer includes a range of 10 to 15 meters. You can use an 8-meter antenna to lengthen the range.

Note that MW noise can be more prevalent at longer distances. Meanwhile, you may notice VHF noise at 8-10 m.

The jammer may possibly jam on frequencies other than the VHF or some longwave ranges.

You can extend the range of the jammer by putting in extra secondary coils. In some cases, improving performance drivers may bring a better result.

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  • The flyback converter generates a high voltage, ranging from 15 to 25 kV. The value varies depending on the power source. Putting a lot of watts into your flyback is quite hazardous.
  • The spark can be the source of ozone!
  • The jammer might harm electronic devices from some meters away. Furthermore, using jammers is illegal!

How to Peak the Resonance

You can improve the effectiveness of the DIY RF jammer by changing the settings to reach peak resonance. The follows are some factors to look into to achieve it:

  • Hook up the ground wire and the “test” spot to a DC voltmeter with the range from 0 up to 10 volts.
  • Set the 22p cutter on the right side to limit the meter’s displayed figure to at most 3V.
  • The step above may lead to the interruption of the system’s original frequency (the system you have created for the aim of frequency jamming).
  • On the left side of the 22p cutter, fine-tune it again to get the frequency back to where it should be.

You have just established the peak resonance of the circuit. You can count on it to function at its peak.

Tips for Homemade RF Jammer

Today’s RF jammer is an essential communication tool. They aid in the enhancement of the privacy and security of mobile communications.

Regarding an FM jammer, there are some tips for you to take note of:

  • The number of rotations and/or the diameter of the coils should decrease. This change allows the RF jammer to work with a variety of frequencies. You may need some trial and error until you detect the right frequency.
  • You should alter the adjacent cutters using your FM radio jammer kit. Keep going until you achieve the perfect jamming or get the best potential jammer system response.
  • Experts strongly recommend constructing the circuit for your RF jammer on a top-quality and well-made PCB.


The process of how to make a radio frequency jammer may not be easy. It requires a proper circuit design. You should also have a strong background in electric knowledge to carry out the steps correctly. However, you may find it easier to achieve the desired result with all the information we have shared.

If you have any questions, please feel free to ask. If you find this article helpful, please share it with your friends.

Thank you for reading!

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