Radio Jammer

This Item is a Radio Jammer. It sends out EM waves of a certain frequency.

Before you enter:
This item is illegal in certain locations. It is only demonstrating how these items work and what only a few dollars at a electronic store can build.

This also Not a Cell phone jammer. Jamming a Cell phone is similar on its principle, but totally a different build, you need a range from 800MHz to 900MHz. You need an OP amp and a few other parts and formulas

F = 1/(4*R1*C)*(R2/R3)
R3/R2 (noticed it flipped) is the frequency range

850MHz = 1/(4*R1*C)*(1/50MHzS)

You must know the fact that they are illegal in certain areas and MUST NOT rant about it and say they are illegal.

Step 1 Precausion

This Item May Be Illegal In You Area, Check It Out Before You Build.
I am not Liable for any offenses.

Why This Works:
The Radio Jammer sends out a EM wave at a frequency. The wave is then broadcast throughout an area. Radios will receive this wave (when tuned to that frequency) and It will block the other wave that is broadcast from a station.

So far in my building, I have only been able to block 1 station using one OSCILLATOR.

Have tried adding 1.5v onto a 9v battery. This unexplainably let me listen to another channel on the channel I was blocking.

Comments

[markee2]

Nice instructables but oscillator is kinda hard to find. I got circuit here claims that can do the same... radio jammer, dont know what is the idea behind in this circuit. Anyone have idea if it is working or it will be working. circuit copied from:
http://www.simple-electronics.com/2011/09/fm-radio-jammer.html

[WakeUpWolfgang]

I live in a place where it is illegal to use such things. The schematic look really strait forward and simple. I dont know if it would work but I am working on a Faraday cage so I can test such things legally

[TheIguana57]

If I swapped the oscillator with say a 2.4GHz one, i could jam any wireless router or bluetooth headset operating on that frequency right?

[Da-Nargh]

Mr Barri-Kid, I thank you for teaching me how to eviscerate unwanted radio stations at work

[mattjoy]

Hello Da-Nargh,

I cannot locate any Oscillators as described here, can you point me in the right direction?

Your help or anyone's would be greatly appreciated.'

I need Mhz around the 107.6

[barri_kid]

I got mine at an electronic surplus store. radio shack may work. I don't know where you are though

[mattjoy]

Hi Barri_kid,

Sorry for my limited info, i am in Australia. The main electronic stores do not supply oscillators of this type. 4 pin... and none of the frequencies I need in my country.

or at least I cannot find them.. perhaps you can point me to an on-line store that supplies oscillators?

[barri_kid]

This may be useful
http://canada.newark.com/oscillators

Usually I don't buy online, so I don't know if its good. I think I have heard of Newarc, or it may have been Newegg.

[mattjoy]

Hi Barri_kid,
thank you.. that links seems to have similar Oscillators..
Thank you for your help.

[FrankOtheMountain]

What frequency osc would I need to jam 660 AM?
WFAN sports radio. Co-workers blasts it all day!!

[garrettg]

You would need a 660 megahertz oscillator

[Joebo]

Good article. This is pretty strange that increasing the 9v battery by 1.5v let you eavesdrop on the channel your were blocking. try readjusting slightly and checking out what else happens... Please let us know. Thanks.

[static]

After reading the instructable, and the comments, I really don't know what to make of it all

[trainman9111]

My ? is can u make it to block wifi signals. I totally understand everything you are doing, and how it works.

[64bithero]

Where did you purchase your antenna?
I can't find anywhere selling them for less than $10 =\

[PerfectPantaloons]

does this block FM or AM??? Or both??!!!!

[shibogee]

where do u live...lol 1 LED at radio shack cost 2.50 atleast

[dawsonj]

dude... here in new Zealand they are 10 cents each

[barri_kid]

Haha, thats why you dont buy electronics at radio shack At a surplus store, prices are cheap

[thepaul1993]

Will a 100Mhz oscillator only block 100Mhz. Or can it span out to 90-108Mhz?

[barri_kid]

There is probably some tolerance to each oscillator. I can't say for certain that it will go from 90-108, but it probably will do +- 1Mhz. I haven't checked it out in a long time, so I don't really know if its +-1Mhz or larger.

[thepaul1993]

So does that mean that this jammer will only block 100Mhz?

[barri_kid]

In a short answer, it will block around maybe 98-102. There is no way to make it have a larger area by changing something electronically, at least to my knowledge.

[thepaul1993]

Then i need to get myself one of these.

[bobryk]

you can add a switch to route the current from the battery to another oscillator of a different frequency to have more than one choice. my family listens to lots of boring stations ; )

[Bardouv]

would there be anyway to use an old stereo instead of phone? so that you'd be able to 'tune into' the station you were trying to block instead of just blocking one station.

[barri_kid]

Stereos are just a receiver, they don't do any transmitting. I understand what you are getting at, where if you want to block some channel you would just turn a knob to get to the certain frequency, but in order to change the frequency, you would need to change the oscillators frequency, which to my understanding would be to shorten or lengthen the crystal inside (which I don't think is going to happen).

[ferguse]

where would you get an oscillator?

[coolmike8789]

radio shack

[arihant]

why you use a led???

[coolmike8789]

so you know when its on

[coolmike8789]

you could always go to a goodwill or a pawn shop to get the phone case

[jonrb]

hi again! this is my jammer so far... it has a wifi aerial and will (hopefully) have different frequencies on each key!

[remiraj]

hi it's can posible to jam catv signals? can any body know how to jam catv signals..?

[jgeekw]

im not sure the exact way to do it, but my uncle was telling me about a guy who put a certain dB anetnna on his CB radio and whenever he "keyed in" (pushed the mic button) to the radio, that it would jam tv signals in the immediate area.

[Colonel88]

Well yes becasue when you press the mic button then only the presser can talk and all of the others have to listen. so only one at a time :D

[TXTCLA55]

uhmmm if its not a cell phone jammer why does it come up when i search "cell phone jammer"?

[Noodle93]

Kids. Cell Phone is used in the body and it searches for it in the body. D'uh.

[frikkie]

I agree

[waffle sith]

uhmmm Jammer is one of the tags. Nice job barri.