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How to Build a Radio/Drone Jammer

sparkgap-motorRadiohax

Spark gap transmitters are the oldest type of radio transmitter made by man. They were first used around 1888 and remained legal until the 1920s when their use became greatly restricted. World War II delayed their complete ban outside of emergency communications for a few years. Now the only way to use them legally is inside a faraday cage. They operate as jammers for the same reason they were banned, they take up a lot of the radio spectrum.

A spark gap transmitter is fairly simple. Send a high voltage current through an air gap, when the resistance of the air breaks down a spark will cross the gap. When this happens electromagnetic radiation is emitted. You can test this in your house fairly easily. Turn on some speakers so they are powered but nothing is coming out of them. Computer speakers that are on will work as will a stereo set to CD or tape with no CD or tape playing. Flip your room lights on and off in rapid succession, you should hear a clicking from the speakers. The clicking is RF energy that is being picked up from the light switch.

Effective Range

The range of this type of jammer is based on a few properties.

  • Antenna resonance
  • Field strength
  • Modulation
  • Terrain

The antenna of this particular device will be more resonant on one frequency than others. As a result there will be more RF energy on that frequency, and harmonics or multiples of that frequency. The range for this frequency will be further than others. Using multiple antennas will cause the transmissions to be greater on more frequencies.

The field strength, or amount of RF energy given off, is directly related to the difference in voltage between the two states. With the type of transmitter we are making one state will be totally off or 0 volts while the other will be on or the full voltage. It is not required to switch between an off and on state you may switch between a lower and higher voltage as well. The higher the input voltage the stronger the RF, the more range you will have. You have normal free space losses that all radio transmissions have which means that in order to double the effective range you will have to apply 4 times more power.

Another consideration is the modulation that is being utilized. Modulation also includes some of the data that is carried over that mode such as digital data. FM signals for example will lock onto the strongest relative signal from the receivers point of view, a weaker but closer signal will appear stronger than a further but more powerful signal due to free space losses. FM can flip back and forth quickly between two stations that have a nearly equal signal strength at the receivers antenna and make it appear like it is mixing the two stations, the reality is that it is not. SSB will mix the two signals, while you may hear noise in with the desired audio you can still hear the desired audio. Spread spectrum will tolerate the most noise.

Digital systems can be jammed even if the underlying modulation is not by introducing noise the decoding circuitry in the radio may not be able to decipher the bits correctly and reconstruct the message. This can result in heavy packet loss on that system rendering it unusable. Many digital systems are more sensitive to noise than their less sophisticated counterparts. Many digital systems are either FM or spread spectrum. FM is more often used for longer range applications.

The specific type of system that you are trying to jam is important to know as it will tell you how much power you have to have and at what distance. The best way to determine what is suitable is to get a similar system and see how far it will work from the spark gap transmitter at a given power.

Terrain includes buildings, trees and other objects that the radio signals will interact with. If you stash the spark gap transmitter in a metal box the signal will be attenuated compared to that same transmitter being placed in an open field. Elevation can also influence the distance the signal may go.

Construction

The construction of this type of spark gap generator is fairly simple. You should be able to get everything for under $50 new, used items may be even less expensive. You will need the following items:

  • high voltage source
  • batteries
  • small bit of wood to mount things on
  • small motor
  • a few nails or screws
  • wire

The high voltage source could be an automotive ignition coil. This takes the battery or alternator output and makes the voltage much higher so that it will jump across the electrodes of a spark plug igniting the fuel. A spark plug is a spark gap, although it is not suitable in its current form as a radio jammer, it could be made into one.

The battery should be suitable to run your high voltage source and the small motor. A motorcycle battery is smaller but will go dead faster than a larger car battery.

The wood should be large enough to let you mount the ignition coil, motor and screws on. This can be any scrap wood or similar non-conductive material that you can find. It should be rigid enough that the components will not just fall apart although it does not have to be that strong. It’s purpose is just to hold everything together. A block of cheese or dried mud would work if that is all you have available.

The small motor can be anything from a vibrator out of an old pager or mobile phone, an electric fan or one you may find at an electronics or hobby store. It just has to have a shaft that allows mounting of a cross member onto.

The first step will be to assemble the motor so that it will function the way you want. When mounting the cross member you should make sure that it is insulated from the rest of the motor either by a plastic shaft or a plastic mounting block. The rod can be a nail although you will want it equidistant from the center.

sparkgap-motor-block.jpg

You can see how the metal rod goes all the way through the plastic insulating block. You may install either one rod all the way through or two rods forming an X. If you install two rods you will have twice the sparks and thus the transmission cycle will be twice as great.

sparkgap-motor.jpg

Once the insulating block is mounted on the motor you should affix two other nails or screws on either side so that they almost touch the cross members you installed in the previous step. You do not want them touching but you do want them as close as possible. The closer the better. You should connect the motor to your battery and ensure that it can spin correctly with no problems and that it does not vibrate itself off of the wood.

Now prepare your antenna. This is a length of wire cut to 1/4 wavelength of the desired target frequency. If you do not know the target frequency you can just make some guesses. You can also connect multiple antennas together to cover various frequencies. Remember you will have RF emitted on all frequencies it will just be more powerful on the frequencies that the antenna is resonant for. Mobile phones are about 0.5 inch antennas and older police radios are 2.86 inches. For a good spectrum coverage if you make antennas of 0.5, 1.0, 1.5, 2.0, 2.5 and 3.0 inches most of the usable spectrum will be covered.

Connect the antenna(s) that you made to one of the stationary side rods. To the other end you will need to connect a ground. This can be to a metal water pipe in your house or to a rod driven into the ground. If you do not have a ground the radio will still transmit although it will be at a slightly lower power.

Now connect the output of the ignition coil to the stationary rods on either side of the motor. Connect the negative terminal to the ground side and the positive terminal to the side with the antenna(s). The idea here is that when the motor spins current will pass from one rod to the other and out the antenna. The motor will switch the output of the coil on and off in rapid succession.

The last and final step is to connect the battery to the motor and the coil. You may optionally install a switch to turn the device on or off or you may just disconnect the battery.

Remember building this is not illegal (in most places) but using it is. You will be causing harmful interference and probably upsetting people.

http://radiohax.wikispaces.com/Spark+gap+transmitter

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19 Responses to How to Build a Radio/Drone Jammer

  1. carl hammel says:

    I guess I’m still contemplating the legality of flying drones that may probably be upsetting some people.

  2. Jolly Roger says:

    This is important info. My thanks to the author.

  3. Saul Goodman says:

    A simpler and far more effective solution might work like this: A stationary spark gap like this one http://img81.imageshack.us/img81/8670/sparkgap.jpg fed by a high voltage capacitive discharge (warning!!!! VERY dangerous,deadly in fact if you touch any part of the circuit while active and even for several hours later),in turn fed to one end of an old T.V. antenna ,the other end attached to a good earth ground, ought to drop those monstrosities like mallards during duck season.Placing powerful neo magnets across the gap in a North-South configuration will interrupt the spark very abruptly and create spikes an order of magnitude greater than without them(an old Tesla trick). The frequency can be adjusted by the distance between the gap.Of course I must insist you don`t try this for any reason because of the obvious danger and illegality of it all,plus the fact that those drones are only up their to protect you from right wing Jee-zus humping gun nuts. Obama loves you after all ;)

    I suspect something like the above is how the Iranians are doing it.

  4. ChowardNewsis says:

    To all a gracious Thank You, my friends.

  5. Curious George says:

    I know nothing about radio frequency or electronics and was just wondering:
    The jammer built in this article is very very small, tiny in fact. This is enough to jam a drone? What is the range, (distance)? Would a larger one using larger components work better or reach out farther?
    Thanks

  6. Anthony says:

    If you are using an ignition coil you would need to be switching the low voltage side of the coil to produce high voltage on the output side. As far as I know a constant current will not work.

    • Jake says:

      your good to go if the coil is off a solid state ignition system, which he failed to mention in the article. your thinking of cdi ignition coils, which is controlled by a low voltage signal input from the ecu

  7. dan sholl says:

    neon sign transformers are great. also some old antique devices totally rock. when a kid i accidentally jammed everything for MILES with an old daithermy machine i connected to a long antenna.

  8. dan sholl says:

    also, bonjour to the nsa

  9. dan sholl says:

    the diathermy machine i used was stronger than the one marconi transmitted across the atlantic. it had 6 adjustable spark gaps and could vaporize #12 copper wire. still have the scar and remeber the pain when it burnt a hole in my thumb. came in a beautiful oak cabinet, and then main switch was 1/4″ copper bars. figure it was 2 kw min.

  10. dan sholl says:

    old model t spark coils also work great, once you add a spark gap- have one- my emergency transmitter

  11. R D says:

    I must say something here that I don’t see hardly anywhere. Being a non member and just following a link in please understand I don’t know anything about the site or group. But this assumes that you have electricity! This ain’t necessarily so. I see a lot of apparent thinking that the power and internet will be on and working without any restrictions. I believe that there is at least there is a 95% chance that this thinking is wrong. Discounting the possibility that the switch will be thrown it takes so little damage to put a large area out of operation. These same restrictions apply to renewable power sources as well. A solar array or a windmill will be easy to see from a drone. Think about these things and what can be done to protect them and you from the unusual. Also pick everything apart to the smallest detail to find it’s weakness because Murphy is always walking by your side.
    R D

  12. Osam bi laid'on says:

    Now ve can make them to down all Amerikan drones in Afghanistan and anywhere else – wupeee !!

  13. Ken says:

    If anyone is interested in the theory behind this, a good video on radio in general and spark gap transmitters in particular is available at:
    http://www.youtube.com/watch?v=2roG4jIjvEk
    It is an old episode of The Secret Life of Machines from the BBC. It shows the original spark gap transmitter and modern homemade equivalents, including theory.

  14. Jason says:

    Military drones use redundancy control systems. Although it is common for line of sight radio transmission, they are backed up and usually, primarily controlled by a direct satellite link. This can also be jammed using a standard satellite dish from your rooftop. You must jam both and override its GPS “return home” autopilot when it loses connection. I would suggest that this is better for jamming communication in an emergency more so than drones. A quick Google search well give you details on jamming the sat link.

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