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Thread: What can cause radio interference with GPS signals?

  1. #1
    Low Bitrate chilli_pepper's Avatar
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    What can cause radio interference with GPS signals?

    Ok guys,

    Heres the senario...I have been using a BU-303 for a few months hooked up to a laptop and sitting on my dash with MapMonkey for long and new journeys. The signal was 90% locked with it sitting on my dash which i was pleased with.

    So I have now installed the car PC with an Opus run leads upto the front for a Xenarc and a usb hub/extension. The Gps is mounted in exactly the same place as it always has been but now wont lock...or many/any signals for the majority of the time.

    Shove it on the roof....instantly locks with 6-8 sats.

    Its really ****ing me off as it was all working so my feeling is something that i have installed must be interfering with the reciever unit itself.

    So what i am asking is what could there be that i have instaleld that interfers with the GPS signals in the car?

    I have extensively tested the reciever and it is working great, it does the same thing connected to a dedicated port, the hub or an extension and i have tried changing the position within the car and it makes no difference!

    Please help me
    Chilli_P

    Epia 800 > 3.5" 30GB HD > Teac Slim CD > BU-303 GPS > Safecom Bluetooth > WiFi > Xenarc 700TSV > Opus 150

    Current Status:Installed - tweaking

    Want Widcomm 4?

  2. #2
    Admin. Linux loser.
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    Bugbyte's Avatar
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    RF interference from the PC or the power supply. I had an identical experience to yours. I picked out a nice spot on the rear shelf for the GPS, tested it with the laptop and it worked perfectly, always at least 7 sats and often more.

    Installed the PC underneath the shelf. No lock. Didn't work. Had to move the GPS to the front of the car. Found out that when I swapped the screen to a Xenarc, it also interfered with the GPS signal!

    Basically, anything in the 1.1 ghz band can potentially intefere with the GPS receiver.
    Quote Originally Posted by ghettocruzer View Post
    I was gung ho on building a PC [until] just recently. However, between my new phone having internet and GPS and all...and this kit...Im starting to have trouble justfiying it haha.
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  3. #3
    Low Bitrate chilli_pepper's Avatar
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    Well

    I have a Xenarc...and as the car is soooo small i cant really get the reciever anywhere more than 1.5 meters (if that more like 1 meter) away from any of it...and if its away from the pc+psu then its near the xenarc!

    Nightmare!

    What are my options? could i wrap the pc and powersupply in foil or something like that?

    How have u sloved your problem if you pc is in the back and screen in the front?

    Cheers
    Chilli_P

    Epia 800 > 3.5" 30GB HD > Teac Slim CD > BU-303 GPS > Safecom Bluetooth > WiFi > Xenarc 700TSV > Opus 150

    Current Status:Installed - tweaking

    Want Widcomm 4?

  4. #4
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    Im having a similar problem in another thread, using a Xenarc and a Garmin GPS mouse split from the same 12v plug; not that that should matter :/

    Garmin GPS18PC causing the mouse pointer to act strange
    Rode-B[O]X: scrounging components

    Bits I bought:
    Xenarc 700TSV | DSSC | GPS18PC
    Pieces Im looking at:
    Axus TC600 WINXPe | EPIA * | GPS gadgets

  5. #5
    Admin. Linux loser.
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    Bugbyte's Avatar
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    Haven't really solved it. The GPS is about a foot away from the Xenarc. It gets intermittent reception. Never loses the lock for a real long time so I just put up with it.

    My PC doesn't have a case. It would probably help if I put it inside a metal casing.
    Quote Originally Posted by ghettocruzer View Post
    I was gung ho on building a PC [until] just recently. However, between my new phone having internet and GPS and all...and this kit...Im starting to have trouble justfiying it haha.
    Want to:
    -Find out about the new iBug iPad install?
    -Find out about carPC's in just 5 minutes? View the Car PC 101 video

  6. #6
    Low Bitrate phord's Avatar
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    No case on my PC. I mounted my Earthmate GPSr inside the dash behind my Lilliput and I always got an excellent lock.

    Then I got a USB GPS mouse because StreetAtlas sucks in a car... and it wouldn't lock unless I held it just right against the glass. Sometimes it worked ok, but usually it showed pretty weak signals. If I put it on top of the car it immediately gets 100% signals from all sats.

    So I punted. I pulled the USB wire through the firewall of the car and put the receiver (magentic mount, doncha know ) on the hood by the windshield.
    Carputer-II: Infiniti Q45
    Simple setup, NAV-only
    Tablet PC :: FP :: iGuidance
    Status: Ghetto, baby!

    Carputer-I: '99 Honda Odyssey
    Dual monitor, separate outputs: Finished
    FP :: iGuidance :: WinDVD :: EPIA M-10000 :: Opus 150w :: In-dash/On-dash

  7. #7
    Low Bitrate chilli_pepper's Avatar
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    My PC is in a wooden box, and under the rear seat the Opus is next to it.

    Is there anyway i can screen them? Would wrapping in foil be a waste of time?
    Chilli_P

    Epia 800 > 3.5" 30GB HD > Teac Slim CD > BU-303 GPS > Safecom Bluetooth > WiFi > Xenarc 700TSV > Opus 150

    Current Status:Installed - tweaking

    Want Widcomm 4?

  8. #8
    My Village Called 0l33l's Avatar
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    Tint can interfere with radio signals.

  9. #9
    FLAC ShawJohn's Avatar
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    As boris said, I found my tinted windscreen contained a metallic film which blocked over half of the GPS signal. But my sunroof didn't so I placed the receiver on top of the sunroof blind under the glass, only thing was, when the roof openned you had to grab the receiver and stick it out on the roof before it got swallowed into the roof cavity

    The GPS receivers also work better with a small piece of sheet metal under them. Mine sits on a 6"square piece of 1mm thick mild steel plate and regularly picks up 8-10sats.

    HTH

  10. #10
    Low Bitrate chilli_pepper's Avatar
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    Decided to waterproof it and throw it on the windscreen scuttle!

    Works now

    Thanks
    Chilli_P

    Epia 800 > 3.5" 30GB HD > Teac Slim CD > BU-303 GPS > Safecom Bluetooth > WiFi > Xenarc 700TSV > Opus 150

    Current Status:Installed - tweaking

    Want Widcomm 4?

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