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Thread: power supplies with minimal radio interferance?

  1. #101
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    Sonicxtacy02's Avatar
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    i think most people know my opinion on the m2 and its RFI issues... so today i put my money where my mouth is and hooked up a DSATX. Even with the computer sprawled out all over the back seat the signal cleared up tremendously! I get all the same local stations that my minivan with a aerial gets. To further test, i spliced the same 12v, acc, and gnd to an m2 while the dsx was connected and here came the RFI again. Moving the m2 around made a noticeable difference in static. Thats my 2 cents on it
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  2. #102
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    Quote Originally Posted by kove View Post
    I have actually used 3 different mobos today.... my good old EPIA, an old shuttle I had laying around and a GigaByte MA78GM-S2H and with all three, no luck.
    So, I now have used two different PSU's and three different mobo's without luck.
    Although I prefer a nice and clean install in the trunk only, I am now looking into mounting the HD unit under the bonnet.
    Some BMW E46 types have the battery in the front under the bonnet in a nice, dry and sealed compartment. As mine has the battery in the trunk, this means I have some room left... initial test showed that by placing the directed unit there, the interference is minimal, even with the M2.
    As there's already a power connection available in that area, only thing I need to do now is extend mitch's cable with a 8P minidin cable, route the antenna and audio cables and I should be ready...... hopefully...
    I will keep you posted... not giving up my hope for radio.. yet..
    For what it's worth, I have an E46 also and absolutely no reception issues. I have the headunit mounted in the glovebox and the CarPC is installed in the trunk over the battery.
    No issues with
    VIA M10000 mobo + M1-ATX + custom case (made from an IKEA key holder box )
    or
    Intel d945GCL + M1 or M2-ATX + M300 case from mini-box.com
    The power and the ground are connected directly to the battery and the ignition line runs all the way to the front to the headunit wiring harness.

  3. #103
    Constant Bitrate utd09bry's Avatar
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    Quote Originally Posted by mazda8 View Post
    What are ferrite beads?
    http://en.wikipedia.org/wiki/Ferrite_bead



    You can buy these in bulk on ebay. They help choke RFI that could be running along your cables.

  4. #104
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    hmmm I like the ferrite beads idea.

    Can anyone attest to this working? If the GLI doesn't solve it I guess this is step two.

  5. #105
    Constant Bitrate utd09bry's Avatar
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    I would once again warn that it's only a band-aid. But they do work quite well. If you do a bit of searching, you'll find radio operators who swear by them. On the same note, you'll find that there are different types (material mixes) that are best suited for suppressing RFI at different frequencies.

    It's a quick, simple, and cheap experiment (and hopefully a fix) at the least.

  6. #106
    Constant Bitrate mstaedt's Avatar
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    Angry

    I hit a giant roadblock when I plugged the monitor back in. It killed my reception again. I did some messing around with rerouting the power cables to the monitor to a different source. This required taking the monitor out of the dash and placing it inbetween the front seats. Reception was much better, but I don't know if it was from rerouting the power, rerouting the video cable, or relocating the monitor.
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  7. #107
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    Do you get bad reception if the monitor is turned off? Does the fact that it is getting power ruin the reception? or just that it is on?

  8. #108
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    Okay. so got my ground loop isolator.... did basically nothing.

    So I'm back to square one... kinda. I know it is the computer itself because my monitor is always on (computer is not always) and I get interference the SECOND I push the button to turn the pc on.

    I guess I can buy some ferrite beads. But one thing to note is the interference is not constant, it can go from only static to good reception with barley audible static.

    Ideas?

  9. #109
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    Figured out two new things.

    First, my case had .002 volts (maybe .02) volts going through it. So I grounded the case.

    Then I found a spot in my drive way with particularly bad reception, and parked it there. Opened the trunk (I have an RX8 so the trunk is like a regular top open style) and the reception went from nothing but static so almost perfect. I close it, back to static.

    When I turn the pc off with the trunk closed, back to perfect reception again.

    ....wtf...

  10. #110
    Constant Bitrate utd09bry's Avatar
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    It's all about signal-to-noise. When you are in spots with a stronger radio signal, you might hear less static... whereas a weaker spot you'll hear more.

    I wouldn't rule out the monitor. My monitor might not be bad when it's just powered on... but when it's displaying video from my PC, it's pretty bad. I've been meaning to grab my laptop to see if it would do the same thing... coming from the vga-out.

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