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Cell Phone Jammer?


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#1 I_Eat_Childrenz

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Posted 03 May 2007 - 01:02 PM

Does anyone know how to build a cell phone jammer? I would really like one of these. I think it would be hilarious to use on my friends. And in public. How hard is it to make? If somone wants to walk me through it or post a link i would really appreciate it. I already googled it and couldnt find plans. Thanks in advance.
B.

#2 I-baLL

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Posted 03 May 2007 - 01:04 PM

GSM jammers are illegal in most places. Plus you're more likely to get a response in the phreaking forum so I'm moving this thread there.

#3 I-baLL

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Posted 03 May 2007 - 01:08 PM

How to make one:

http://www.ladyada.n...ake/wavebubble/

Background info:

http://en.wikipedia....ll_phone_jammer

#4 R3c0n

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Posted 03 May 2007 - 10:00 PM

How to make one:

http://www.ladyada.n...ake/wavebubble/

Background info:

http://en.wikipedia....ll_phone_jammer



Wave Bubble is freaking awesome..only problem is that ...when RC1 was released I spent MONTHS trying to build it and get it working .... long story short I spent lots of money on the circuit and it didn't work at the end.....(me = clumsy). The documentation is excellent imo, but you have to be VERY careful and detail oriented to get it working perfectly...when I built it I didn't even have a spectrum analyzer + oscilloscope (not required, but very helpful) Anyway, when I feel a little more confident with my electronics skillz, I think I am going to attempt it again sometime this year or early next year...because..what can I say? Its a fucking KICK ASS project..period.

Just a reminder, about a year ago (when I attempted it) the minimum fine/penalty for owning/operating a Jammer was about $11,000 and year in jail...so be ultra-secretive and careful if you are building this..and don't tell anyone.

#5 carwash

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Posted 03 May 2007 - 10:16 PM

You could try ordering one of these units and see if it makes it thru.

But honestly you really need to question if it's worth it to fuck with people and then maybe face some serious charges.

With the way things are now they could really throw the book at you if you start fucking around with what people hold sacred.


http://www.chinavasi...-signal-jammer/

#6 R3c0n

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Posted 03 May 2007 - 10:24 PM

Nah , I would rather build it myself.....btw, my only goal is to learn how it works and 'shut the cells up' of idiots who use it in the lab/libraries/subways and annoys the fuck out of everyone....some of these people don't deserved to get jammed..they deserve to get EMP'd. Just today some idiot lady had a loud 'public' conversation about how her 'ex-husband' too her dog or someshit....highly annoying.

Edited by R3c0n, 03 May 2007 - 11:42 PM.


#7 carwash

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Posted 03 May 2007 - 10:37 PM

I agree it would be great to build one of those Wave Bubble units and learn from the process.

There are too many rude cell phone assholes out there to let things slide.

Maybe when I have more time I will order the board and get the parts.

That would be a great project.

#8 optyXslave

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Posted 04 May 2007 - 12:50 AM

Does anyone know how to build a cell phone jammer? I would really like one of these. I think it would be hilarious to use on my friends. And in public. How hard is it to make? If somone wants to walk me through it or post a link i would really appreciate it. I already googled it and couldnt find plans. Thanks in advance.
B.


Here's a Couple links and a PDF that might help...


http://www.flickr.co...3963559/detail/

http://64.233.167.10...q...jam/ &hl=en

http://english.cxem....e/mobile220.php

http://english.cxem....e/mobile217.php

http://english.cxem....e/mobile219.php

http://english.cxem....e/mobile221.php

http://www.astalavis...bc5f6479807.pdf

Attached File  gsm_jammer.pdf   901.36KB   34 downloads

#9 PurpleJesus

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Posted 04 May 2007 - 09:21 AM

This might be a crazy idea but how about hacking a cell phone's firmware?? could a regular cellphone be made to just start stepping all the frequencys it would use normally but just to cause havoc? Might even be able to make some kind of java applet that would do it.. Then if you get caught with it... say it was a virus in the game of frogger you downloaded from blah.com

I say the above with absolutely no clue with what's going on inside a cell phone.
/s
opps.. old habit.

#10 I_Eat_Childrenz

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Posted 04 May 2007 - 10:21 AM

thanks guys. im probably gonna order the board when i get payed. I work at a pizza place and im sick of people not helping out because theyre on their cell phones. and whos really gonna ask me if i have a cell phone jammer in my cigarette box? "excuse me sir, is that a cell phone jammer in your box of cigs?"

#11 Mizugori

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Posted 06 May 2007 - 03:38 PM

question; i thought cell phones operated on different frequencies or networks or whatever... ex. i believe sprint uses a different type than verizon. is this not true?? and if it is, doesn't that mean a jammer would have to be tuned to work against a certain carrier?

#12 R3c0n

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Posted 06 May 2007 - 05:35 PM

thanks guys. im probably gonna order the board when i get payed. I work at a pizza place and im sick of people not helping out because theyre on their cell phones. and whos really gonna ask me if i have a cell phone jammer in my cigarette box? "excuse me sir, is that a cell phone jammer in your box of cigs?"



Order the board ? For what ? The Wave Bubble ? I _Don't_ recommend attempting that project unless you got some solid electronics experience...it has a shitload of surface mount's ..and alot of very tiny details.

#13 PurpleJesus

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Posted 06 May 2007 - 09:53 PM

question; i thought cell phones operated on different frequencies or networks or whatever... ex. i believe sprint uses a different type than verizon. is this not true?? and if it is, doesn't that mean a jammer would have to be tuned to work against a certain carrier?



Something about fones being able to 'roam' and use other networks leads me to believe there is enough in there to start with...


Another odd thought... if the phone's firmware it too difficult to hack how about someone figuring out where in that thing the actually transmitter circuits are and make some kind of hardwire gadget that can added to make the phone use it's internal transmitter to start sending garbage signals all over the spectrum... ramp up over all the available frequency. Wouldn't be as nice as that other gadget that zeros in on the target... but if this thing could screw up all calls in a cells range by conflicting with signals, forcing calls to drop, it would still be useful... cause there be a few minutes of people trying to reestablish their calls just to have it all go to crap when the modded fone hit's their freq again.. Then they have two choices.. go outside where the signal is better or just eat there lunch in silence. Either way I don't have to hear that schizophrenic voice eating it's lunch.

#14 BigBrother

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Posted 06 May 2007 - 10:04 PM

question; i thought cell phones operated on different frequencies or networks or whatever... ex. i believe sprint uses a different type than verizon. is this not true?? and if it is, doesn't that mean a jammer would have to be tuned to work against a certain carrier?

Sprint and Verison are both GSM type carriers. Cingular and t-mobile are some other type of network that I should remember but dont.

#15 Multi-Mode

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Posted 06 May 2007 - 11:18 PM

question; i thought cell phones operated on different frequencies or networks or whatever... ex. i believe sprint uses a different type than verizon. is this not true?? and if it is, doesn't that mean a jammer would have to be tuned to work against a certain carrier?

Sprint and Verison are both GSM type carriers. Cingular and t-mobile are some other type of network that I should remember but dont.



Verizon and Sprint = CDMA
Cingular and T-Mobile = GSM

Alltel can go ether way but they are mostly CDMA (they have alot of gsm coverage in the north and south Dakota areas). They do operate on different frequency's. The frequencies are purchased from the FCC and they vary in different areas. Also each BTS uses a different frequency from its adjacent cells. This way the signal from one tower doesn't interfere with the other. Mobile Stations are told what channel or frequency to move too between hand offs.

The firmware idea is interesting but could require getting really down in it. I was working on a firmware issue on a GSM PC Card and at a certain point in we needed an adapter between the PC and the Card. Needless to say reverse engineering the things would be no small undertaking. Easier to customize your own jammer/transmitter.

#16 BigBrother

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Posted 06 May 2007 - 11:35 PM

Damn, it's been a long day. I knew that but blanked when I was typing. :( Oh well

#17 PaUbU

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Posted 07 May 2007 - 03:06 PM

Its kinda funny that this link finally made it up here - Limor, owner of Adafruit industries, and the designer of the Wavebubble is a previous resident of the collective which i live in, Wonderland (carwash - how odd that you have that as your avitar).

While we never lived here together, one of the Wavebubble ( i Think judging by the shots of the ones online) proto boards was found kicking around the 'LOFT' area when we cleaned out the place last month. Its funny that she also interned over at EYEBEAM openlab - somewhere i eventually hope to have the time to whore myself out to as well. Eyebeam is responsible for the GRL, who if you dont know, are the most K-rad graf-nerds in all the universe. Ive been thinking about getting her to make an industrial strength unit for the house but i still havent gotten in touch with her. Prolly wouldnt go over very well with whatever cell company rents the space on our roof.

The device is not easy to build and anyone who has never soldered on PCB, let alone SMD's before will fail miserably at it and probably cook most of the components. However, the kit is well designed and the instructions are awesome - so if u build it and it dont work, its prolly your fault.


-d0c :blink:

p.s. - Limor is a genius, Just like Spot (http://www.electricsheep.org) one of our current residents worth mentioning - If you're a genius or artist who doesnt suck in the NYC area and want to live in a unique and off-the-wall space - contact us: info@wonderlandny.com

//edit - dropped the word 'space'

Edited by PaUbU, 07 May 2007 - 03:08 PM.


#18 PurpleJesus

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Posted 07 May 2007 - 06:07 PM

If anyone wants to attempt SMD soldering check out this link:http://www.seattlerobotics.org/encoder/200006/oven_art.htm

And I thought toaster ovens were only good for pot pies....

#19 gbppr

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Posted 08 May 2007 - 09:08 PM

For the 800 MHz stuff, get a Mini-Circuits double-balanced mixer, and feed the IF port with a 45 MHz clock oscillator through a 0.1 uF series capacitor. Put 3.5 inch long pieces of wire to act as antennas on the RF and LO ports.

For the 1900 MHz stuff, change the 45 MHz clock oscillator to 80 MHz, and change the wire lengths to around 1.5 inches.

#20 PaUbU

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Posted 09 May 2007 - 09:47 AM

here is another link on DIY SMD soldering - according to SparkFun its not as scary as it seems.

http://www.sparkfun....p?p=SMD-HowTo-1




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