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Thread: power supplies with minimal radio interferance?

  1. #111
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    That is a good point about the monitor. But doesn't that mean if the PC was on, but the monitor off you wouldn't get interference? and mine almost completely goes away when the trunk is open.

    I bought 4 ferrite beads, Where is the best place to put them on the wires? and on which wires? power, ground, usb, audio?

  2. #112
    Constant Bitrate utd09bry's Avatar
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    Putting them on the power lines going to your power supply is a good choice. Snap them as close to the case as possible. You should move them around and see which wires make a difference though

    And yeah, you would expect the interference to go away. I think in my case, the monitor isn't the main player. But I've taken a portable radio out to my car and if I hold it close to the screen the reception goes to crap. If I switch video sources to something like AV1 (which has nothing but a blue screen) then it's not so bad. But my reception was still bad so it wasn't the only problem :-p

    Sounds like your trunk is keeping all the interference buttoned up Interesting...

  3. #113
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    Well, I just put the ferrite beads on.

    Same story, trunk open = good, closed is bad. I had 4, and two were like these heavy duty ones...

    Would it be better or worse to take it out of the case? could the non shielded power wire from the engine cause it? I'm lost...

  4. #114
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    I also have quite a bit of usb extension cables. They were pretty cheap, but I don't see how there could be much difference b/t that and any regular usb cable.

    Anyway those cables could be causing enough interference? What about VGA cables?

  5. #115
    Constant Bitrate utd09bry's Avatar
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    Most VGA cables have ferrites at both ends. If yours doesn't you might try adding them.

    Removing your PC from the case is a bad idea. It's also a bad idea to use materials other than metal to build your PC case with, if you are concerned with possible EMI/RFI from your PC. It's the same concept for wires... you want to surround them with a conductor at zero (ground) potential (which is why it's a good idea to ground the case - even though your motherboard should be grounding the case already).

    It's really worth it to disconnect all the cables from your PC and slowly add them back to see if you can root out a troublesome wire. Then, either try to ferrite the noise out of it or even relocate it... because maybe it runs too close to the radio. If you can, another good experiment is to have an external power supply handy (plugged into your garage's AC power) to power up your radio, monitor, etc in order to isolate them from your car.

    I know these threads have been around for a while, and some people get lucky with easy fixes and others never can get it working. I'm sure your actual car can play a huge part in that.

  6. #116
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    Well. I kinda did some of the stuff you suggested in the mean time. I discovered it is not any usb cables, or the VGA cable. I disconnected the VGA and usb from the monitor and the interference persisted. It could be the power for that I guess, but I'm doubtful.

    I am going to try the AC power supply. If I don't get interference does that mean it is the m2-atx? (put ferrites on both power and ground to the psu already and RFI persists)

    I read something else that you can shield your antennae wire. Can I do this with anything at home like foil or something before I invest any more money in unnecessary products?

  7. #117
    Constant Bitrate utd09bry's Avatar
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    Have you tried powering your carpc from an external power source? You can use a regular old ATX PC power supply plugged into your garage/house and send 12V/Ground to the M2 from there. This would sortof test if the problem is your PC period or something related to the power lines in your car (or maybe a ground loop). Worth a try

  8. #118
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    Quote Originally Posted by utd09bry View Post
    Have you tried powering your carpc from an external power source? You can use a regular old ATX PC power supply plugged into your garage/house and send 12V/Ground to the M2 from there. This would sortof test if the problem is your PC period or something related to the power lines in your car (or maybe a ground loop). Worth a try
    I don't follow. Run the m2-atx off of a standard atx ps? how do I run the m2-atx from a regular ps. My thought was to run the pc off the AC ps to test if it was something to do with the power wires, or the m2-atx vs the mobo, HDD, etc.

  9. #119
    Constant Bitrate mstaedt's Avatar
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    I'm back to using the mini-van as a testbed

    I took the computer back out of my truck and set it on the front seat of the van. Got another monitor (we use the exact same one at work) and set it on the dash. The Visteon is still in the glovebox of the van and running through the stock radio via the antenna out cable. With all of that powered up, including sending the VGA signal to the monitor, reception is excellent. It's not perfect ("perfect" being what it is with no computer in the car), but it is close.

    I can reassemble some more of my truck system into the van, but when I get to the amps I'm going to have to move back into the truck since I would have to remove the back seats to get the amps out.

    I still can't figure out what's better about my van. I can say that there are practically no opportunities for ground loops in the van since I don't have any audio cables in there. Maybe it's like mazda8's trunklid open vs. closed condition - just a change of environment.
    --------------------------------
    Project completed! (almost)

    My Truck as featured in Custom Classic Trucks magazine.

  10. #120
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    my mazda has the window antennae, which is directly above the computer.

    I'm going to see if it in the m2-atx this weekend by swapping the power supply with an AC one.

    What I think I might ultimately have to do is shield the wires going to the antennae, but I don't want to spend money on shielding stuff before I know that is the problem. I've heard of foil being able to shield it, is that true?

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