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Thread: Radio

  1. #1 Radio 
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    This isn't exactly ethical, and it is assumed one knows the physics involved to build such a device. But, I always thought it would be a good idea if a bank robber built a radio jammer running on approx 153 mhz, and had a guy sit by the police station with it. Radio is a very complex tool, from a physicists point of view. I find it interesting how it could mean the difference, in this case, between a good robbery and jail time.

    On a side note: I think a math and computer/electronics and engineering forum should also be added here. It would allow us to combine all disciiplines very effectively.

    Well here's a good paper I read on radio recently.
    http://phrack.org/phrack/62/p62-0x0b_Radio_Hacking.txt

    Comments, expantions, retorts, opinions welcome.


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  3. #2  
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    haha. I just noticed the other forums are here. :-\


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  4. #3  
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    Almost every thing imaginable uses science, so it was a little difficult to determine what forums should be where. Also, whether to talk about electronics and computers in their own topic, or in physics, or in engineering... All opinions of how to classify are welcome.

    Back to the subject. I think if you were smart enough to know to tune your radio to the frequency used by the police (is this what you're getting at?), then you could probably make money in another way, perhaps as an electrician. Where do you learn about how to build radios, and do they count as electonics when they are the old fashioned kind?
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  5. #4  
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    I use to have fun blocking radio stations my siblings would listen to by tuning to another radio station above or below the station they were listening to, I think it's called the BFO (Beat frequency Oscillator) in a radio that operates at harmonics of the base frequency. Well in any case the end result was that I could blank out what they were listening to 100%.

    It would be easy to jam police radio just by parking your car outside with a slightly modified ham radio. You would of course have to use a wide spectrum to get all the channels involved. I'm sure they might also have a higher frequency backup channel or two.
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  6. #5  
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    2112:
    I meant use the radio to basically transmit noise over the desired frequency as Insanity suggested. It was just what was on my mind on the time. There are obviously millions of better uses for radio than that, but I had jsut finished watching "Cops".

    You would need more than just a modified ham radio to pull this off. It would have to be sucking down a lot of juice, and you would need a large aerial. I decided to pick a police station because they are usually relay stations. Generally (at least where I am) police frequencies range from 153.00 - 153.76. A pretty small spectrum to jam.

    Another fun, not very plausible, use would be to pick up phone calls, satellite signals, etc. We are constantly being bombarded with this electromagnetic waves. There is infinite information floating around all around us, and all we need to do is snatch it out of thin air (and likely decrypt it als --but we'll save that discussion for the Comp Sci forum).
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  7. #6  
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    Not sure if this would work, but you could FM modulate a signal with the signature from say some radioactive isotope (random noise) to blanket a large spectrum with white noise. May be a safer way to achieve the same results

    I also use to jam TV stations by placing an open CMOS basic logic (AND, OR, NOT,etc) chip near the TV, the inputs on the chip in this case would be open to noise and the output would reflect such noise at an amplified level. Found that one out by accident. All that was required was a source of power. I'm sure someone else could elaborate more on where the chip was receiving it's "noise". It covered a very wide spectrum.
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  8. #7  
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    Yes, I've received other people's phone conversations on my phone before. I've been talking to someone and suddenly I can hear two other people carrying on a converstation, but they can't hear me or the person I am talking to.
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  9. #8  
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    Quote Originally Posted by 2112
    Yes, I've received other people's phone conversations on my phone before. I've been talking to someone and suddenly I can hear two other people carrying on a converstation, but they can't hear me or the person I am talking to.
    This is normally just caused by either two people being on the same frequency or a frequency shifting due to environmental conditions. Sometimes it's just caused by sub standard design or components. Radio waves passing through certain atmospheric conditions can actually shift in frequency to a pretty good degree.
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  10. #9 Felony violation 
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    It is a felony to block any communication of Police, Hospital, Federal agencies,... To do so would immediately result in the contacting of local FBI who by the way have on hand triangulation equipment. It would take a few hours to trianglate a large area. But since the transmitter blocking signals of relevance would be relatively small, triangulation would occure in just a few mins. Then its a pretty short trip to the local jail, since your sitting within range of the transmitters output disruption signal.
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  11. #10  
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    So I take it stuff like this would just be frowned upon then

    http://www.globalgadgetuk.com/mgb1.htm

    I could have so much fun driving around with one of these. They also have hand held versions.
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  12. #11 Protected frequency and bandwidth 
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    I can't believe people are that cold! Emergancy service radio is protected for a reason, ya might kill someone because of yer meddlin with protected frequency. Remember there are no statute of limitations for murder, even though it may only be second degree. In Okla. we will kill you right back for first degree murder. Life and Death are not a childish prank to be fooled with, responsibility is a thing to be respected. How would you feel if someone killed your closest loved one by comitting such an act?
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  13. #12  
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    How would you feel if someone killed your closest loved one by committing such an act?
    SUV drivers put people at risk every single day, they drive vehicles needlessly that are proven to kill far more people then they save. A drunk driver behind the wheel of an SUV is even worse.

    So the person driving their SUV that plows into a Honda civic because they were talking on their cell phone should deserve to die. Why because they are being irresponsible in their choices.

    Fast food kills people all the time also, through a series of repeated events. Yet nobody goes to jail, go figure.

    Society is a large collection of hypocrites for the most part.
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  14. #13  
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    Quote Originally Posted by artlewi
    I can't believe people are that cold! Emergancy service radio is protected for a reason, ya might kill someone because of yer meddlin with protected frequency. Remember there are no statute of limitations for murder, even though it may only be second degree. In Okla. we will kill you right back for first degree murder. Life and Death are not a childish prank to be fooled with, responsibility is a thing to be respected. How would you feel if someone killed your closest loved one by comitting such an act?
    Wah Wah Wah.
    - sploit -
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  15. #14 Re: Radio 
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    Quote Originally Posted by sploit
    This isn't exactly ethical, and it is assumed one knows the physics involved to build such a device. But, I always thought it would be a good idea if a bank robber built a radio jammer running on approx 153 mhz, and had a guy sit by the police station with it. Radio is a very complex tool, from a physicists point of view. I find it interesting how it could mean the difference, in this case, between a good robbery and jail time.

    On a side note: I think a math and computer/electronics and engineering forum should also be added here. It would allow us to combine all disciiplines very effectively.

    Well here's a good paper I read on radio recently.
    http://phrack.org/phrack/62/p62-0x0b_Radio_Hacking.txt

    Comments, expantions, retorts, opinions welcome.

    Even if the guy built a police radio jammer he can't stop the banks own security system alerting not only the police but the service provider at the same time. That wouldn't give him/her much time to break open the vault and get much money, if any at all. Police radios are not tuned or attached into the security systems of banks, they are mostly hardwired and hard to defeat for the redundancies built into the banks systems are many. If you cut the lines that triggers the alarm, if you try to bypass the system you'd better have the proper frequency to match that of the system you're trying to defeat or that also sets off the alarm.


    It would be prudent to actually try holding up the bank during business hours in order to gain easy access into the already open vault then make your getaway without hurting anyone. The only problem is that you won't get much money for it weighs allot and you don't have but a few minutes to get it and get out. If you are really lucky you might get away with a few hundred thousand dollars but more likely to get but a few thousand.

    Is it really worth it to rob a bank knowing all of this....NO!
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  16. #15  
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    I always thought, instead of jamming cell phones, make them all ring at the same time!
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