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Boardwalk :: Forum List Hardware Hacking Electronic Projects
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Nullkraft
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Re:Active Radar Jammer - 2006/04/20 23:48 Well, one of the things that work really well is pulling information from a signal that is below the noise floor. A good example is Voyager which is out at the edge of our solar system and broadcasting at less than 100mw. That signal is so far below the noise level you would not believe it but to this day Nasa is still in communication with it. Your TV remote is another good example, lot's of infrared noise floating around but the remote modulates the signal at 38 to 40 KHz which the receiver only looks for signals at that frequency. Anything else is filtered out.

Military systems jam radar signals by modulating at different frequencies and very high power but they are also blinded by their own jamming. Probably the easiest way to jam Ka band would be to find its frequency and return a phase shifted version of the signal back to the attacker. That way it throws off their timing signal and distance measurements. That is if they are not modulating the signal and embedding digital data in the signal.

Ok, that's really freakin' bizarre. How'd my post get ahead of the original poster? Or am I just seeing things?

Post edited by: Nullkraft, at: 2006/04/21 06:50
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ThomasGallen
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Active Radar Jammer - 2006/04/21 02:30 Up for discussion: How hard would it be to build a radar jammer? Let's make it simple and say Ka Band. Sadly my knowledge of radio wave detection and ranging is limited, but it would seem that all you have to do is produce a massive amount of radio noise at 33-35 GHz. To make an anology: in the same way that yelling really loudly in a room where two people are [trying to] having a conversation makes it difficult to interpret the conversation, producing a lot of radio traffic in the spectrum of a radar detector should jam it...
The real beauty is that you don't have to be particularly accurate, what I do know of broadcasting on a particular wavelength is that it's very difficult to get an exact wavelength, here you don't need to do that because you want a variety of wavelengths.
Comments welcome.
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CodedChaos
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Re:Active Radar Jammer - 2006/04/21 06:42 interesting, while I can't see many uses for the jammer (outside of the Middle East ) it seems like you have the right idea, although, I have no prior knowledge on this sort of thing, it definitly sounds cool.

I can do similar things with cell phones (GSM network) and a linksys B wireless, really screws the cell phone signal

Post edited by: CodedChaos, at: 2006/04/21 06:43
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TheArmenian
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Re:Active Radar Jammer - 2006/04/21 06:46 well if you can find a transmitter that can work on those frequencies then just hold down the transmit button. I advise that you dont try to do that, because if your caught the FCC will own u. They dont take kindly to people who jam frequencies. what exactly are you trying to jam?
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ThomasGallen
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Re:Active Radar Jammer - 2006/04/21 07:42 I was wondering how your post got ahead of mine as well, but no matter. I see what you're saying about the modulated signal and also the phase shift return of signal. LIkely the best solution is the phase shift return signal. As a theoretical and practical question though, it would still be interesting to know if you can jam a radar gun simply by crowding its signal out with noise.
Being in the medical profession I'll make an analogy to an eye: If I shine a bright enough light in your face you won't be able to make out any features around the light because all your nerves are essentially maxed out in stimulation. My thought would be if you were able to create a massive amount of noise (signal) that it would prevent the signal the radar gun sent out from being read. Consider another example, if you buy an FM transmitter for your iPod or whatever and you tune it to a radio station nearby, you get a mixed signal and you end up hearing more of the stronger signal right? I'm betting that if you increase the other signal that it will drown out the initial stronger signal...?
Certainly taking the signal sent out and phase shifting it and possibly amplifying it would be the best solution, but could a brute-force (as it were) mechanism also be designed and applied?
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TheArmenian
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Re:Active Radar Jammer - 2006/04/23 07:26 yeah, the post is all screwy, i was second to reply, so maybe we are in different timezones and it is screwin up the forum. anyways

Yeah, if you neutralize the wavelength with another waves the opposite of the one being transmitted then nothing will be heard, but simply transmitting anything at that frequency with enough juice will create so much noise that it will make it impossible to hear or see in some cases what is being transmitted. but as stated earlier the FCC scans most bands and if your screamin on a channel for a long period of time (this period of time is variable maybe one hour or maybe weeks) they will try and track you down and fine you. i believe it was a SEARS who got fined something like $12000 for simply using 5w FRS radios to communicate in their store instead of the standard .5w.
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