How to Create Your Signal Jammer

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For a long-long time many people were looking for this cool recipe of making something interesting for yourself. And I was one of them until last days. In my quest I came across the Jammer Store blog post called How To Make Your Cell Phone Jammer: DIY Guide. It inspired me to make something like that by myself.

All necessary info, schemes and pictures are there, so I tried. The result is represented in this humble guide for you.

Step 1: The Basics


This signal jammer uses 800MHz frequency to operate because many cell phones are working on the same frequency. So I chose the sweeping oscillator as my VCO. It is really efficient yet may be difficult to use if you are beginner without some semi-professional RF-testing tools.

The clock oscillator (45MHz) is driving a local oscillator port as my noise source and is located on the mixer of the mini circuit. To equate the impedance of a clock oscillator with the mixer there is an impedance matching network. Local oscillator signal goes through this network and impedance is matched.

The 800MHz antenna from the old cell phone is connected to the RF input (mixer port). The RF output then goes to the amplifier located on the mini circuit. The amplifier will increase produced output by 15-16dbm of pure power. The empowered signal is going to another old phone antenna.

Step 2: Your Jammer Works!

GSM800 cell phones have their frequencies separated by 45MHz exactly. So when any cell phone tries to make a call - it becomes blocked by itself! The phone talker will hear its own voice.

You can also keep in mind that this cell phone signal jammer can block all cell-based trackers which use your car GPS to track you down and record the data. Even IEDs are probably could be jammed, at least those ones controlled by cell signals.

Step 3: Pics and Notes

I used 600MHz mixer but it works nice due to some electronic interferences.
The amplifier is really a must for this device even considering its power consumption.
The case is made from aluminium box for better heat loss.
UHF connectors were attached to the mini circuit because they are perfect for antennas to fasten.
Voltage regulator is required for the nine volts battery to convert voltage.
The battery located inside and separated from other details using foamed plastic.
Do not forget to place the power switch (it may seem obvious yet it is easy to forget).
The antennas from my old Motorola cell phone but you can use other models.

Well, this is probably all. Now go and make some cool stuff!

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    155 Discussions

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    CarlosP185

    2 years ago

    Good, I with a few friends of the college we need to do this object and I believe that with his serious help every easy mas.

    Porfavor if it has e-mail write it and there we are in contact.

    Regards

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    DivyamT

    2 years ago

    Well can i place any amplifying electronic component or it should be respective to the rf mixer and sweeping oscillator. Pls kindly rply

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    EddyM4

    3 years ago on Introduction

    Hi, I want to build a 40 meter cell phone jammer. how can i boost 10 meters to 40 meter? anyone help

    1 reply
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    JamesG33EddyM4

    Reply 2 years ago

    Power and antenna length are a start. Possibly the speed of oscillation.

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    hphoobalan

    3 years ago on Introduction

    Sorry for asking cause i'm not an expert in electronics.

    So can anyone tell me where can I get a sweeping oscillator?

    1 reply
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    servicemarin

    3 years ago

    In sweden we have about ten different frequencies used by cellphone providers. Does it mean that I need to construct 10 different jammers of this type to be sure that no signal can pass trough? Or is it enough with a couple of jammers? What exactly do I have to change for other frequencies?

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    JamesG33servicemarin

    Reply 2 years ago

    No, im thinking you might be able to put a knob that turns and selects the range your looking to jam. Search online

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    ChetanchowdaryM

    3 years ago

    Can anyone please, suggest me the specifications or what kind of antenna used in this project. Please drop info on my mail :-mchetan133@gmail.com

    1 reply
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    JamesG33ChetanchowdaryM

    Reply 2 years ago

    If you have a Redbox in your neighborhood, go and look at that antenna they use. Thats a 2.4Ghz antenna. That would be petfect... Probably the best. Its also a good antenna for many other projects, such as extending your home wifi signal up to almost half a mile from home. Im going to use antennas from my handheld Ham radios. Im sure your could also design your own antenna.

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    markusturku

    2 years ago

    thank you. need this against darpa-styled neuro RF-implants and mind control

    1 reply
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    JamesG33markusturku

    Reply 2 years ago

    Another good reason could to bring back conversation at the dinner table.... Lol

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    heykene

    2 years ago

    pls can i get the full circuit diagram , i need it for my final year project . here is my mail sergrod98@gmail.com. thank u

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    Doshman

    2 years ago

    Anyway to get a schematic and component list

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    Jasxxx

    2 years ago

    can you make me a jammer and send it too me? And set it for electronic harassment frequencies

    jsmnbabic@live.com.au

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    mnazarulakram

    2 years ago

    so it able to jam all entire network right . how about to jam only 3G/4G freq network

    email me mnazarulakram@gmail.com

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    RohitP38

    3 years ago

    please tell me all about, how to make this and what I need,
    rohitpachauri115@gmail.com

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    Kasper_Sky

    3 years ago

    if anyone was successful in getting the circuit diagram can you please email it to me as well, support@allentownbitcoins.com

    Very much appreciated!