Continue to Site

Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

Register Log in

GSM phone "jammer"

Status
Not open for further replies.
S

solvarg

Full Member level 2
Joined
Feb 15, 2002
Messages
120
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,296
Location
Sweden
Activity points
854
Iwould like to build a device that could jam, break a GSM call. A short range 2-4m RF transmitter able to disturb (break up) a phone call.
Any one seen a thing like this?
Any one has an idea on how to design one?


Thanks!
 

Are you aware that such a jammer is illegal in most countries?
Regrds - ME
 

other methods

A fully legal method would be to shout out "Diarrhea of the mouth indicates constipations of the brain." as you point to the person on the phone.
 

solvarg said:
Iwould like to build a device that could jam, break a GSM call. A short range 2-4m RF transmitter able to disturb (break up) a phone call.
Any one seen a thing like this?
Any one has an idea on how to design one?


Thanks!
Click to expand...

Very easy. You need a VCO that you sweep with a sawtooth around the center frequency of the GSM phone's receive frequency. You can add a small amp on the VCO output to buffer and give a bit of amplification. The VCO is swept at a few KHz with enough amplitude to cover the GSM receive frequency bandwidth.

I was involved in the prototype design of a dual-band unit for a government agency in Brazil and our unit could block and terminate any phone call in a 70m radius.

As the previous member said, this device is illegal in a lot of counties and I am only aware of about 8 that allows the use of this in restaurants and theatres.

E
 

Just an tout

I need a schematic, anyone?
Would I be possible to use an old scraped GSM phone? I that case have anyone seen a phone schematic lying around?
 

h**p://gbppr.dyndns.org/PROJ/mil/celljam/index.html
 

Status
Not open for further replies.

Similar threads

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Back
Top