Wireless Question

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A signal jammer works on the same principal as an intelligence jammer, which you seem to have perfected.

I like Redfred's response. He is actually trying to answer your question, which is hard to read yours due to your fractured english.

Essentially, imagine trying to hear a conversation in a very noisy room. Well radio signals are like sound in one sense, they cary information on specific frequencies or a spectrum of frequencies.

If a competing signal is introduced with enough power it will hide or overpower the original signal.

Radio communications work in many ways (AM, FM, spread spectrum, etc.), so interference that is successful in blocking a transmission must account for the type of signal you want to block.

For instance, the Voice of America transmission to Moscow is AM (Amplitude Modulated). For Russia to jam that signal, which it is doing now, only requires what is called a dead carrier of the same frequency. A dead carrier is simply a signal at a specific frequency with no data imposed on it. An AM radio station broadcasting silence is such a signal.

Jammers usually work by creating a competing signal of approximately equal strength and frequency to the signal you are trying to jam at the point where the receiver is.

For a good explanation, do what you probably should have done first. Go to

http://en.wikipedia.org/wiki/Radio_jamming

During especially WW2 and the cold war Voice of America operated a very large transmitter/antenna site in Lincoln Park, NJ. These were aimed to various European and Asian countries that the USA wanted to influence. Sometimes they were subliminal, others not, but all done to influence resident of the countries they were aimed at. In order to counteract this the subject countries would block the VOA transmissions with jamming signals on the same frequency and type of transmission. This was very often by interjecting "white noise". It is still done but not to such a large operation.

Good Luck, Old Salt

Illegally in most jurisdictions.