Thread: frequency jammer circuit theory help

Hi all I wanted to know the theory behind a frequency jammer circuit. How does it jam frequencies I know that it emits certain frequency that cancels the effect of the other frequency but my question is that how does it emit such frequency?Thanks alot in advance

you need to make a more powerful antenna generating the same frequency as the one you want to jam. An antenna basically consists of three main parts a resistor,capacitor and an inductance coil ( which is basically a satelite dish, a bit of wire on the back of the old wireless set) there is a diagram on wikipedia LC circuit - Wikipedia, the free encyclopedia its alright I guess it isnt explained very well in comparison to old book I have. You used to have to use lots of tech for this but now a variable resistor makes it really easy to tune to a particular frequency as you'll see in most radios there is a wheel to change the radio station. Simply its about the rate of discharge of your capacitor really the more,electricity you add the faster the capacitor,discharges this rate of discharge is your frequency. Then all you have is power how big an antenna can you make and how efficient is it at sending radio waves. tbh wiki is terribly bad

Cell phone jammer is an electronic device that blocks the transmission of signals between the cell phone and its nearby base station. By using the same frequency as the cell phones, the cellphone blocker creates strong interference to the communication between the caller and the receiver. It is efficient in blocking the transmission of signals from the phone networks, including UMTS, 3G, CDMA, GSM and PHS.

Originally Posted by fine

Hi all I wanted to know the theory behind a frequency jammer circuit. How does it jam frequencies I know that it emits certain frequency that cancels the effect of the other frequency but my question is that how does it emit such frequency?Thanks alot in advance

I noticed that you "liked" fiveworld's completely wrong, worse-than-useless answer. Note that his "solution" involves no power source of any kind. That by itself should have told you that it was incapable of doing much (if any) jamming.

The correct answer is that a jammer is, at its most basic level, a transmitter that operates at around the same frequency as the signal to be jammed. If the jammer is received at a signficantly higher power than the normal signal, the receiver will be overwhelmed. That's jamming.

So, a basic jammer is nothing other than a transmitter. The greater the transmit power, the greater the jamming effectiveness. And if the jammer can transmit over a range of frequencies, rather than at a single frequency, it can jam many channels.