The World's Simplest Radio Jammer

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By Phillip Torrone
Posted 2005/04/25 @ 10:16 am
Category General

Probably not a good idea to try this out depending on where you live, etc.. etc.. here’s the “world’s simplest radio jammer”. The project uses a 100 MHz crystal which I haven’t seen, the page goes on to say that it was procured out of some old circuit board from the 90s. Link.

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16 Responses to The World’s Simplest Radio Jammer

BrK on April 25th, 2005 at 10:40 am said:

This is a classic Afrotech story. One of the best “mods” sites around.

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shortname on April 25th, 2005 at 1:02 pm said:

It is very short on details…can anyone point me to more detailed information?

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alankilian on April 25th, 2005 at 1:54 pm said:

The reason it interferes with a large band of frequencies is because it is trying its best to produce a 100 MHz SQUAR wave which is the sum of every odd-frequency harmonic of 100 MHz sinewave.

So, when you broadcast it, anyone looking for a sinewave on practically any grequency sees a signal, and this signal interferes with the official signal.

But it would be bad to build one of these.

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airship on April 25th, 2005 at 2:13 pm said:

You also need to check out this guy

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airship on April 25th, 2005 at 2:14 pm said:

You also need to check out this guy’s speaker system, which is based on old hard drive mechanisms (the heads dance to the music!), and his dangerous-looking professional soldering center controller. Afrotech is a 1337 haX0r.

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Novysan on April 25th, 2005 at 2:22 pm said:

Here’s 10 of ‘em!

Ebay!

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Novysan on April 25th, 2005 at 2:24 pm said:

Now with links!

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wsuverkropp on April 25th, 2005 at 5:29 pm said:

These are not ‘crystals’ but integrated crystal oscillators, that indeed produce a square wave output. Keep in mind you’ll also be blocking local cordless phones (911 blocking, not a great idea imho).

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alankilian on April 25th, 2005 at 7:08 pm said:

Do not (Damn apostraphe problem again. ARGH!!!) kill yourself trying to outbid Mr P. T. since you can get 106.25 MHz jobbies from DigiKey any day of the week.

http://www.digikey.com/scripts/DkSearch/dksus.dll?Detail?Ref=253568&Row=470880&Site=US

Jameco.com also has 100 MHz TTL oscillators for $2.49
http://jameco.com/webapp/wcs/stores/servlet/ProductDisplay?langId=-1&storeId=10001&catalogId=10001&productId=118963&searchValue=osc100

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HarryDangler on June 27th, 2005 at 4:41 pm said:

I ordered in a 100mhz crystal oscillator and hooked it up. Guess what, that’s right it oscillates at 100mhz. It did not interfere with any other frequency. Project failed.

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ewbaker on October 6th, 2005 at 5:32 am said:

What would be great is an FM jammer with the ability to increase or decrease the jamming. I sit in a cubicle, and the person next to me, despite frequent requests to stop, plays their radio. Ever try to code c# listening to the Jerry Springer show? (It’s a ‘tv’ radio).

If I could turn up the jamming power enough to just jam the radio in the cubicle next to me, that would be excellent.

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miscblogger on November 13th, 2005 at 8:33 pm said:

this would have been really handy in the dorm where i used to live. I used to have someone living next to me who would always turn up the radio! it was so annoying!

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Joey Bowen on July 6th, 2011 at 11:56 am said:

It is a 100 Mhz Crystal Oscillator… in any case thanks for the interesting post on how to build a radio jammer.

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Frederick Bauer on January 31st, 2012 at 5:57 pm said:

if the alpha wave, the brain, is between 7 and 12 Hz then why would you want to start at 100?, we need something from o to infinity with a limited perimeter, something like ten to fifteen feet, just a personal jammer for sine(heart) and the other for alpha (heart), I am tired of having slight arithmia from assholes with a sine generator, that will kill a person, and alpha, mind telephathy, I am tired of thinking to assholes I do not know, can you believe they even fuck with my dreams?, I do not want to kill them I just want to jam them so they will stop using my electronic equipment.
Bauer

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- Frederick Bauer on January 31st, 2012 at 5:59 pm said:
  
  you should work for the Federal Government Bauer and save us from all of this death
  
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  Frederick Bauer on January 31st, 2012 at 6:01 pm said:
  
  I am the third Frederick Bauer to agree, now you the Federal Government tell me who I am or you are or we are or where I am transmitting from if you think there is a problem
  
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