Cell phone and WiFi jammers!

[Trace]

How well do they work? And are they legal in the U.S.A.?

Does anybody have a schematic for either?

I can buy a cell phone jammer, but was wondering if it could be built cheaper. And I have found a way to make a WiFi jammer but it is not very powerful.



How to build a WiFi jammer video:

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<a href="http://www.metacafe.com/watch/953946/how_to_build_a_wifi_and_bluetooth_jammer/">How To Build A WiFi And Bluetooth Jammer - video powered by Metacafe</a></font>[/HTML]

[Drum Thumper]

Very much illegal to own in the United States.

[Trace]

Why did I expect that from the U.S. government

[xRyokenx]

I'd love to have one of those if I ever teach... I wanted one when I was in highschool too, random people texting during class was annoying. Too bad it's illegal. Stupid government. They can take **** away but when we try to say, watch a movie in peace, it's not allowed.

[Quakken]

It's all for the illusion of freedom.


But, a cell phone jammer would definitely be a clear violation of the bill of rights, such as right of free speech. It would be like making it impossible for people to whisper in the theater.

[Trace]

Yea, I guess so. Yep, I'm in highschool and thats what I wanted it for. And so does 1 of my teachers haha
France just legalized it for use in theaters

And, they can talk all they want in person. I'm not stopping them, but if I could stop the phone, that would be nice. I don't see how it "exactly" violates the bill of rights :p

[mtekk]

Very much illegal to own in the United States.

I'm not sure if possession is illegal, but operation is definitely illegal without a FCC license. Optimal solution, take the FCC classes to get the license, which also allows you to use higher powers and more frequencies for FRS and GMRS 2-way radios.

As for jammers working, yes they can. The one they "made" there takes advantage of 2.4Ghz band that 802.11b/g/n and bluetooth uses. Some phones will mess up networks with normal use. Their mod just creates a possibly better antenna, however their suggestion that a Dual Layer DVD will work better than a CD has little to no theoretical backing. I find that an improperly shielded microwave makes a much better (and dangerous) jammer for the ~2.4-5Ghz range. I really never trust a thing I see on metacafe, there seems to be an ongoing make stuff up and present it as fact trend that goes on in it.

If you build one yourself, and only use it occasionally (for educational purposes of course), I doubt they will ever catch you. You can find instructions online for making one. You'll need several radios and a microprocessor to control everything, looks ripe for a PIC (which you can get a free sample from Microchip). I think Hackaday had something on this a while back (like two or so years ago), might be worth looking at that.

[mtekk]

Oh, I found the article, it's on Wave Bubble.

[Trace]

Thanks guys! I have been google'ing around and didn't find much. Looks like just what I need.

[crenn]

The 'device' in the video isn't a true jammer, but it will interrupt communication and act similar to a jammer.