Signal Jammers
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Signal Jammer is basically a white noise generator but in the RF spectrum.
As for how to build one,.. it would mainly depend on the section of the spectrum you are in need up. And how complex the signal is you are wanting to interfere with.
And you must consider the legality of the action and equipment...
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From a Wiki:
Legal Issues of Using RF Jammers
The United States, United Kingdom, Australia, and many other countries have determined that cell-phone blocking is illegal. Explicitly, the United States calls upon the Communications Act of 1934 to enforce such a law as it prevents people from "willfully or maliciously interfering with the radio communications of any station licensed or authorized." Furthermore, manufacturing, importing, and advertising RF jamming devices is also considered illegal.To explain, jamming is actually seen as property theft because a private company has purchased the rights to a particular portion of the radio spectrum. Simply put, jamming that frequency is seen as stealing the private property of that company. Secondly, RF jamming is seen as a safety hazard as it could potentially block important and urgent phone calls, such as calls for police or an ambulance.
The Federal Communications Commission (FCC) enforces the jamming laws but has yet to actually prosecute anyone. However, if convicted, first-offense penalties could include: 1. Up to $11,000 fine. 2. One year imprisonment. 3. Seizure of device.
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Depending in the intended application, a faraday cage may be more suitable and also less likely to incur the wrath of federal regulators.
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What are you trying to jam?
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@nadnerB said:
Depending in the intended application, a faraday cage may be more suitable and also less likely to incur the wrath of federal regulators.
As he is in India, the regulations are likely different.
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@Breffni-Potter said:
What are you trying to jam?
Certainly the better question to help him find an answer.
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Chances are it is not legal to do what you want Lakshmana - we are all curious now though
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Love that movie! Extra +1 for you @MattSpeller
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just to test a signal jammer with my cell phone.How it works ?
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In the US these are very much illegal. Don't know about India.
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@Lakshmana said:
just to test a signal jammer with my cell phone.How it works ?
Your cell phone basically "talks" on a certain channel (actually a set of them). A jammer basically floods that channel with "noise" making it impossible for the phone to find the phone signal in all of the noise.
To make a human analogy as close as possible, imagine if you had someone sending you a message on a television across the room that you had to look at to read. Now a jammer would be like someone hooking up flood lights pointed at your face so that while the television is still "there and not blocked, you can't see it because everything in the room is so bright.
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Here is how one works...
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@JasonNM said:
In the US these are very much illegal. Don't know about India.
And yet they use them in the US. Fishy, isn't it, what these local governments do.
