The World’s Simplest Radio Jammer

0 thoughts on “The World’s Simplest Radio Jammer”

1. BrK says:

   April 25th, 2005 at 10:40 am

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

2. shortname says:

   April 25th, 2005 at 1:02 pm

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

3. alankilian says:

   April 25th, 2005 at 1:54 pm

   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.

4. airship says:

   April 25th, 2005 at 2:13 pm

   You also need to check out this guy

5. airship says:

   April 25th, 2005 at 2:14 pm

   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.

6. Novysan says:

   April 25th, 2005 at 2:22 pm

   Here’s 10 of ’em!

   Ebay!

7. Novysan says:

   April 25th, 2005 at 2:24 pm

   Now with links!

8. wsuverkropp says:

   April 25th, 2005 at 5:29 pm

   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).

9. alankilian says:

   April 25th, 2005 at 7:08 pm

   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

10. HarryDangler says:

    June 27th, 2005 at 4:41 pm

    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.

11. ewbaker says:

    October 6th, 2005 at 5:32 am

    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.

12. miscblogger says:

    November 13th, 2005 at 8:33 pm

    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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13. Joey Bowen says:

    July 6th, 2011 at 11:56 am

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

14. Frederick Bauer says:

    January 31st, 2012 at 5:57 pm

    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

1. Frederick Bauer says:

   January 31st, 2012 at 5:59 pm

   you should work for the Federal Government Bauer and save us from all of this death

1. Frederick Bauer says:

   January 31st, 2012 at 6:01 pm

   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

15. Sudheer says:

    November 18th, 2013 at 4:05 am

    Fine. It is looking very short. We feel very happy if you provide some more detailed information about this radio jammer. Here I have another circuit diagram on the same concept. If anybody interested, visit http://goo.gl/WLA4MM