How to Make a Radio Frequency Jammer? – 7 Simple Steps


Written by

Rafeal Hart


Fact-checked by

Norris Howe

how to make a radio frequency jammer

Radio frequency jamming could block radio transmission from arriving at a receiver. With the use of a frequency jammer circuit, we can ensure more privatized radio conversations in households and establishments.

However, the availability of this device is limited because it is moderated by law, and most of it either costs beyond the budget or is not readily made. So, if you aim to build a RF jammer without costing a large amount of money, continue reading to uncover how to make a radio frequency jammer yourself.

Step-by-step to Make a Radio Frequency Jammer

The circuit diagram

What to prepare

  • Flyback driver
  • Fast diode
  • Screw
  • Screwdriver
  • Large heat sink
  • Epoxy
  • Glue
  • Hard paper
  • Power Source

Step 1: Learn the circuit diagram

This diagram shows a simple circuit of a frequency jammer device that performs below 500 MHz. This radio frequency jammer circuit diagram covers from 5 to 10 meters with the use of 22pF trimmers which are perfect for modifying the transceivers’ field and then causing the jammings.

Step 2: Create the circuit

You need to do this first before dealing with the flyback. Start by utilizing a fast diode to safely wind the two coils (primary and feedback) in similar directions.

In setting this up, you should use a large heatsink for it to last longer. It is discouraged to use a smaller one because it could easily heat up causing it to be damaged fast.

Step 3: Attach the circuit

Using screws, drive them to attach the driver circuit. This is important so that you can attach the flyback later on.

Step 4: Set up the flyback

Do this by forming a cylinder using hard paper and then removing the primary and secondary coils. Attach the paper and coils using glue.

Step 5: Coat the coil

Coat the coil using an epoxy. This is an important step because the coils, especially the secondary, will emit sparks as you use this DIY radio jammer.

In addition, make sure you do not displace the other parts so you can achieve a decrease in ultrasound vibrations. Also, check if the coil has established a 1-millimeter thickness and if the magnetic wire has 0.1 millimeters.

If the desired space is not achieved, adjust the coil before applying the epoxy.

Step 6: Attach the antenna

This is the last step in which you may notice the sparks increase their length as you also increase your antenna. This happens because of the voltage drop.

Also, as mentioned, this DIY RF jammer can generally cover up to 10 meters, but if you do it right it could reach up to 15 meters. If you plan to extend it more, just extend the antenna, the coils, and the power source accordingly.

Step 7: Test it out

Of course, the last step is testing. If you followed the instructions correctly, you will achieve the same result as the following video.

If you really want to elevate the radio frequencies you can jam, watch the video tutorial below for the visualized steps. As long as you follow all of them, it is guaranteed that you can make a signal jammer with Arduino that could cover up to 1000 MHz or 1 GHz.

You will need to buy and prepare the following materials. But you don’t have to worry because most of the online shops today offer them cheap and you will not spend more than ten dollars in total.

  • CC1101 Board
  • Arduino Pro Micro with 3.3 volts and 8 MHz clock
  • 8-color wire connector
  • USB 2.0 Cable Type A/B
  • Laptop or computer
  • Power Source



Ways to peak the resonance

The best way you can do to peak your homemade jammer’s resonance is by testing it using a DC voltmeter that could cater up to 10 volts. Accomplish this by connecting this device to the ground line.

Then, turn the 22p trimmer to the right side to achieve the maximum volts. You may notice that adjusting it may change the frequency of the RF jammer kit.

To aid the change, turn the other 22p trimmer (left side) to get back the right frequency.

Are RF jammers illegal?

Some radio experts and researchers are allowed to jam radio signals without limitations. However, if you are an ordinary user, please know and search for the legal limitations of all frequency jammers in your country before you create your own.

As an example, according to the Federal Communications Commission’s memo in 2020, it is prohibited to jam “authorized radio communications” in America. You should not operate, market, or sell one that might interfere with important radio communications like public emergency call lines.

So, the takeaway? Just always make sure that the homemade signal jammer you are making is inside of the scope of legal limitations in your area.

Other tips about a radio frequency jammer

  • Beware of the legalities

This article would never want you to be in trouble so we emphasize that you must know the legal limitations in your country regarding this topic. Do not disobey the law if it is prohibited to create any type of radio jammer.

If it is allowed, do not disregard the limitations and be complacent. Even though you might be only aiming to create a FM radio jammer, for instance, you might end up jamming some important frequencies which are punishable by law.

  • RF Jammer Detector App

You may install an application on your smartphone to detect if there is a frequency jammer device around you. This could be an advantage especially if you do not find the true cause of why you are having bad reception.

  • Trial and error

Being patient is an advantage in doing trial and error on its coils. If you aim to jam a certain frequency, focus on the coils themselves.

Its rotation, length, and in-between matter as to what frequency your device could jam. Adjust them until you get your desired results.


As a last reminder, learning all of this information might become risky if you do not take this technology responsibly. Now that you have learned how to make a radio frequency jammer on your own, you should not create one just for fun.

So, the next time you plan to make a frequency jammer, you may start by creating some projects that could elevate the radio research in your area. Actually, there are a lot of ways you can utilize this but never forget its limitations.

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