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Thread: power supplies with minimal radio interferance?

  1. #31
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    That box is likely an amplifier, is it getting power? Was the experimental mast antenna grounded? what is he using for a tuner? I may have missed that.....

    That power supply, does it have any small value bypass caps across the 'lytic filter caps? or any small value caps dumping RF to ground in that thing.

  2. #32
    Car Audio Moderator durwood's Avatar
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    Quote Originally Posted by chad View Post
    That box is likely an amplifier, is it getting power? Was the experimental mast antenna grounded? what is he using for a tuner? I may have missed that.....
    I figured that was the amplifier box. I know he hard wired the power to the acc wire so it should be powered on when the key is on. I did not measure to see if it was getting power, but it should be.

    The exp mast antenna was grounded via the base to metal, without ground no reception.

    The tuner is the Directed HD radio DMHD-1000.

    That power supply, does it have any small value bypass caps across the 'lytic filter caps? or any small value caps dumping RF to ground in that thing.
    No idea, there is no schematic available and I haven't poked around enough to have an answer for that.

    More pieces to this puzzle:

    I remembered this morning he has his windows tinted, most likely metallic based. I know his USB GPS antenna would not work in the back inside or outside of the car, it had to go up front to work.

  3. #33
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    Most Hondas have passivated glass from the get-go, but the tint can't be helping.

  4. #34
    Car Audio Moderator durwood's Avatar
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    Everything I'm reading is that people who have a window antenna and metallic tint suffered reception loss and they had experience before and after. I guess some manuals even mention factory nav is affected by metallic tint. The answer to that is ceramic tint.

    This site sort of mentions it when you compare ceramic to metallic.
    http://www.formulaone.com/pinnacle.htm

    I'm starting to think he might be fubared. The tint might be picking up everything. I'm not giving up yet though, a desktop power supply is still a switcher and that works fine, but it's not grounded to the same vehicle ground.

  5. #35
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    the car is junk. the best way to fix it is get new one!


    any way i tried a 120v 400 watt pc psu with no problem
    wtf

  6. #36
    Constant Bitrate utd09bry's Avatar
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    Has anyone here tested their screens? I held a portable radio up to my screen the other day, and when the source was on the PC it was NOISY! When it was switched to any of the AUX inputs it wasn't as bad. Luckily the noise didn't radiate out more than an inch or two out from the screen, but man. It was some serious stuff. Got me thinking, cause I have my tuner in the dash pretty close behind the screen (not to mention, plenty of wiring).

    Keep us updated!

  7. #37
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    M4-ATX Same Issue

    Hey guys, I thought I would share my problem as well. I have the M4 power supply (please refrain from Opus bragging ) and the power supply is interferring with my radio antenna. I have a seperate antenna for the HD radio hooked to the computer and the stock antenna for the stock FM tuner in my car. When the computer is on I get static on the stock FM tuner (still get stations just not very well) and the HD radio for the computer won't tune anything. If I just turn on the HD radio without the PC on I can tune all the stations perfectly... also, when I was testing the system on the bench with a regular ATX power supply everything worked perfectly so it must be interference from the power supply.

    My ground is solid, I have a 3' - 4 gauge wire attached directly to metal in the trunk (which I sanded all around). I have tried several other ground to ensure this is not the problem.

    There is no change wiggling/pulling on any wires and I have tried unplugging the wifi/gps/everything and still get the interference.

    So, I just have my power supply mounted in my computer case, is there a way I can enclose the M4 to get rid of any additional interferrence it is causing? I was thinking of building a two piece box with the middle layer lined with a few layers of metal and tin foil... not sure if that would help since I would want a fan on the box but any help would be great. I know they also sell a case (optional $6.95) for the M4 which I am not using; that would probably help...I mean, had I bought that

  8. #38
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    Wires???

    Scratch that I did notice more/less interference when wiggling the wires... at least I found something that is beter or worse. What does this mean?

  9. #39
    Constant Bitrate
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    i've just done some back to back testing with a M2atx and an opus 120w. The difference between them is huge! I originally thought my HQCT was rubbish so I got a radio from Mitch js, turns out there was nothing wrong with the hqct it was just the interference generated by the M2-atx.

  10. #40
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    Add me to the list of the ones with problems with M2 + FM reception.
    I have ferrite in the power supply cables for M2 (cables go through just once tho) and have good and short grounding cable to the chassis of the car.

    Car is -98 sedan Passat and antenna is stock amplified antenna (amplifier is in the bottom of the antenna).

    I can get FM reception, but it gets a lot worse when the PC is powered on. I have to try to feed the M2 from outside source to check if it's radiated interference or if the interference gets to the ground of the car or what.

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