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Thread: pc/electronics, cops, and can they do that?

  1. #21
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    Oh, and abut the monitor - if you take a look at the original post, the computer was indeed shut down, not the monitor. Or not just the monitor - that's not clear from the original post.
    I'm sorry if this isn't the best in question response, despite a little tipsy being a friday night... The whole pc was shut down, including monitor. No sound coming from the head unit, while that remained on, and a blank touchscreen. There was no 'No Signal Found', etc, on the monitor and no sound running through the headunit/speakers. I am basing this on the fact that I had to power on the pc again, and switch the monitor on (sorry I didn't mention turning the monitor back on in the original post)...

    But if you want to test, stick to the OP's set up - hence an M4. In fact, this is HIS test wrt his case.
    wrt?

    Maybe if MythBusters could check this out I'd be reasonably confident the opposite was true. (They are still flawed & wrong on well over 50% of their cases aren't they?)
    I wouldn't mind sending an M4 to mythbusters, if just for lawls! Maybe I could set this up and see if they find any interference/anything at all....

    I didn't think this thread would bring out so many suggestions/ideas, and while I can't even come close to the knowledge others exhale on this forum, I can only provide so much myself because I am a computer geek at heart with almost no knowledge of the electronics behind the fact... Sorry if this doesn't help, will report back after a good nights rest

  2. #22
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    Ha! Don't worry - I deal with stuff like this all the time...

    wrt the M4, see power supplies with minimal radio interference? and work back from there....

    wrt testing the M4 and similar, no one in their right mind would if they fail to meet standards and regulations. IE - if they fail the regs ec, then you are just reinventing the wheel - it can cause problems.
    However, that is probably a perfect candidate for MythBusters - try to prove "facts" instead of myths. (Not that anything is strictly speaking a fact, but I hope you know what I mean...)

    wrt to testing your situation, that reflected how issues get out of hand or misinterpreted...
    We were not testing M4s or non-speed radars or non-copcar equipment - we were testing an hypothesis that <whatever> caused your outage. (THAT is the scientific method. Refer to statistical theory etc. And psychoanalysis - ie, Boolean Algebra.) We were not testing other power supplies, or other people's set ups. (Or at least, I had no intention to!)


    This is simply a case of your thread being hijacked.
    And me breaking my own rule of not responding to questions that are not from the OP. (But I hate authority - no-one tell me what not to do!)


    Besides, with all those fitting anti-theft devices, why would the cops or OSA need EMP devices - others have done it for them.

    Free firewall or virus-checker anyone?

  3. #23
    Maximum Bitrate kegobeer's Avatar
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    After reading up on the power on radar detectors and talking to a few law enforcement people, the radar just doesn't have enough power to reset anything. However, their have been reports about their radio equipment wreaking havok with electronics. I'd say that's much more probable than a radar detector causing this. But, I still think it was a fluke and not related to the police car at all.

    To the OP: does your computer power your monitor, ie do you have it connected to the 12V rail or the power supply itself?

  4. #24
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    To the OP: does your computer power your monitor, ie do you have it connected to the 12V rail or the power supply itself?
    Nope, the monitor is powered via cig lighter at the moment.

    I'm not concerned about the thread, doesn't seems like it's been hijacked yet... I see a lot of ideas/speculations thrown around so far!

  5. #25
    Low Bitrate jparks27's Avatar
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    Quote Originally Posted by OldSpark View Post
    Its not EMP...

    Do they use radar speed detectors? Was it on?
    That - coupled with an M4 - is a likely culprit.
    RADAR is operated in microwave range, which reflects easily, which is one of the reasons it's used for RADAR... The units are also rated in mw, not watts, or kilowatts, but milliwatts... Most only transmitting less than 50mw... that's 50 one thousandths of a watt.... pretty small.

    1. 99% of the radar signal would be reflected by the metal skin of the vehicle.
    2. Even at point blank range, there is not enough RF energy to zap a MB/PS


    what city/state was the officer? Some older systems are still on VHF or even VHF-lowband, cranking 110W lowband from 10' away might be enough to freak out your system.

    I have X, K, and Ka band RADAR units operational in well over 100 cars that I've installed personally... all with MDCs/in car computers. Zero issues whatsoever.

  6. #26
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    New Jersey's about the only place still using X band speed radars, right? Everything out here in Nevada is K and Ka. I've had two Beltronics running in the car at once (for testing) and didn't see any problems with the PC or my M2-ATX. Plus I park next to the flighline at Nellis AFB, and there are ALL KINDS of radars operating in the kilowatt power range. Never seen any adverse effect on my rig.

    VegasGuy

  7. #27
    Low Bitrate cmcd2820's Avatar
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    I am going to have to go with kegobeer on this as well. Depending on the types of radio they use (portables with trunk mounted repeaters and a bad antenna can put out some wicked EMI) but being an amateur radio operator, I can tell you that I have keyed thousand watt radios next to desktops running off of batteries with similar types of DC-DC PSU's and never had a hiccup. Could it be that your monitor glitched, you thought the computer shut down because the display went black and then rebooted, causing the power off of the CPU? Just thinking out loud on causes....

  8. #28
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    what city/state was the officer? Some older systems are still on VHF or even VHF-lowband, cranking 110W lowband from 10' away might be enough to freak out your system.
    Erie, PA.

    I'm going to type up an email for mythbusters to see what they say, if they even respond, about frequencies and problems. I'll be gone until tomorrow evening so I won't update until then if I even hear back that soon!

  9. #29
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    Normal transmitters are far more likely. Remember the old 27MHz AM CBs, & 2m HAM sets (AM)?

    As was said, radars are mW (and directed) as opposed to (tens of) Watts from Tx etc.

    Now if he drove past one of my 20kW radar amps (~5-30MHz)...

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