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Thread: Radio noise / can't tune in.

  1. #1
    Low Bitrate spyda's Avatar
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    Radio noise / can't tune in.

    I'm running an OPUS 150, powering an 80Gb HDD, and a via MII 10000 Mobo.
    I've put a clean power line in, right back to the battery, with nothing else being powered on this line, and a clean ground line all the way back to the battery.
    The switched positive is connected to my turbo timer harness, which is a pretty meaty wire!
    Trouble is, when the computer powers up it really disturbs the ability to pick up any radio signal, it just manages it, but then goes off in search of a better signal.
    I have a Kenwood head unit and an electric antenna. (if this makes a difference!)
    Any ideas how to sort this out?

    Cheers,
    Adam.

  2. #2
    Low Bitrate spyda's Avatar
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    bump

  3. #3
    Man
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    When you say 'ground' where are you grounding it too. Make sure you ground to the cars metal body, things to ground (PSU metal case, -ve side of battery,ground of PSU) try a few things, see if you can get rid of that noise.

  4. #4
    Low Bitrate spyda's Avatar
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    I've tried grounding the black wire for the PSU to the nearest point of the cars metal body. (about 1' of cable). I've also tried running it clean all the way to the battery.
    Do I need to ground the metal part of the OPUS as well as the black wire?

    Cheers,
    Adam.

  5. #5
    Man
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    AS im not sure how your carputer is set up it could be different, but try grounding the metal backplate on the soundcard, or if the whole carputer is in a metal case, try grounding that, you might even want to see if grounding the radio antenna. If it doesn't make a difference unground it and try other things. Most of the computer noice comes from the PSU, but it can also come from things like HDDs, in normal computers the case is connected to ground, so any metal that would usually be in contact with the cae you could try grounding.
    Where is the carputer located? If its possible to move it away from the radio/antenna that might help. The thing is it could be anything, so you just have to try anything and everything to see what helps and what doesn't.

    Quote Originally Posted by spyda
    I've tried grounding the black wire for the PSU to the nearest point of the cars metal body. (about 1' of cable). I've also tried running it clean all the way to the battery.
    Do I need to ground the metal part of the OPUS as well as the black wire?

    Cheers,
    Adam.

  6. #6
    Man
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    Oh and dont forget about ground loops (nasty things they are). A bit of searching on this site, and I found a link to this site that explains them well, and gives links to places with information on how to fix them.
    Link is here @ riocar.org

  7. #7
    Low Bitrate spyda's Avatar
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    Quote Originally Posted by Man
    Oh and dont forget about ground loops (nasty things they are). A bit of searching on this site, and I found a link to this site that explains them well, and gives links to places with information on how to fix them.
    Link is here @ riocar.org
    I'm going on a grounding mission when I get in from work then!
    Where the mobo is usually screwed to the case do those bits need to be earthed? What else should I earth? I'm gonna earth the OPUS case, the mobo, the HDD (where it's usually screwed to the case), there's not a great deal more to be earthed!
    How hot does the OPUS get during operation? will I need to cut a fan hole for it?

    Thanks,
    Adam.

  8. #8
    Low Bitrate spyda's Avatar
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    Everything, (mobo, PSU, case, HDD), is earthed.
    Still having trouble tuning into normal radio, the FM modulator is working fine and I can tune into the caputer....
    What do I try now?

    Adam

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