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  • GPS dropouts caused by xenarc?

    Hi all,

    I have searched and searched, but cannot find the exact answer to my dilema, so if someone can point me in the right direction, i would really appreciate it -

    I have a DWW gain/xenarc screen, and have noticed that when my BU303 GPS module is near the screen, it causes dropouts (i can test this theory, because when i run the GPS mobule on the laptop without a gain xenarc it works fine sitting on the dash of my car, when i hookup the xenarc, it will drop out intermittantly, and when it does dropout, if i turn off the xenarc, it the GPS will get its signal back instantly).

    any ideas on how i can shield my GPS module from the xenarc's screen interferance? also - i read a thread about lilliputs doing this, is it common for a xenarc to do the same? (i cant find the original threads, sorry)



    much oblidged to all who can help.
    Hilux Surf (4runner) install
    false floor in rear housing;
    4 channel amp
    600w cont. inverter.
    Also- DigitalWW 7VGA indash
    headunit for FM/AM,DVD,SVCD,CD,MP3
    P4 3.0 with low profile AGP card.
    4x4" speakers (splits) in factory locations
    BU-303 GPS

  • #2
    how about moving the receiver away from the screen..?
    rebuilding carpc... kinda..

    Comment


    • #3
      tried

      tried too, as much as i can, i am limited to where i can put the GPS mobule, it needs to see the sky blah blah blah, i have no rear parcel shelf, so its got too be on the dash somewhere, but because the xenarc is right in the middle of the dash, it effects the entire dash area...
      Hilux Surf (4runner) install
      false floor in rear housing;
      4 channel amp
      600w cont. inverter.
      Also- DigitalWW 7VGA indash
      headunit for FM/AM,DVD,SVCD,CD,MP3
      P4 3.0 with low profile AGP card.
      4x4" speakers (splits) in factory locations
      BU-303 GPS

      Comment


      • #4
        how are you powering the xenarc?
        rebuilding carpc... kinda..

        Comment


        • #5
          12v phiong regulated power supply

          12v phiong regulated power supply, which lives in the rear of the vehicle. reason being is that the digitalWW indash version does not come with a power supply of its own.
          Hilux Surf (4runner) install
          false floor in rear housing;
          4 channel amp
          600w cont. inverter.
          Also- DigitalWW 7VGA indash
          headunit for FM/AM,DVD,SVCD,CD,MP3
          P4 3.0 with low profile AGP card.
          4x4" speakers (splits) in factory locations
          BU-303 GPS

          Comment


          • #6
            Well, I personally haven't noticed a drop out near the Xenarc screen, but then again, the closest I ever had my receiver was about 1.5 Feet with an Earthmate. Being your setup is like that, you may wanna look into getting a Roof mountable Receiver or Antenna. This will give you the best possible scenario for satelite coverage.
            Mark

            Website: http://www.greenpowerenthusiast.com/

            Car'Puter Project
            - Xenarc 700TSV
            - MSI RS482M-IL Mobo + AMD Turion MT-32 (25W)
            - 1x 256MB Corsair XMMS DDR400
            - M2-ATX
            - Belkin 802.11G W-Nic
            - Garmin 15H GPS
            - WinXP SP2 (NLited)

            Comment


            • #7
              Forgot to add that you can possibly shield any Xenarc interference by using a STEEL plate between the Xenarc and the GPS receiver. But remember, this plate can also block the GPS signal if you block the line of sight with this plate.
              Mark

              Website: http://www.greenpowerenthusiast.com/

              Car'Puter Project
              - Xenarc 700TSV
              - MSI RS482M-IL Mobo + AMD Turion MT-32 (25W)
              - 1x 256MB Corsair XMMS DDR400
              - M2-ATX
              - Belkin 802.11G W-Nic
              - Garmin 15H GPS
              - WinXP SP2 (NLited)

              Comment


              • #8
                I'm pretty new to this whole thing, but I thought I'd mention that I have the same problem with my setup as well, though I am using a Lilliput. It can be totally isolated to the monitor and I've tried relocating the GPS <pharos 360> as far away as possible, including the other end of the car. The only success I found was removing it from the inside of the car and holding it on top of the roof. This test was done several ways, including nothing at all attached to the lilliput, but simply powered on while running the GPS from the tablet pc, not otherwise connected to anything. Any info on this would be a good thing.

                Comment


                • #9
                  This happened once to me with my lilliput. I have my GPS mounted to the top of the dash so that I can still use it with out the computer and have my LCD screen mounted to the front of the dash. I repositioned the location of the screen a bit and haven't had a problem with it since. It is still only at most a foot apart from each other. I think it has something to do with the high voltage inverter for the CCFL backlighting causing interference with the GPS. All I can suggest is to just find a spot where your GPS works and keep the cables for each separate.
                  Rick S.

                  XP Pro SP2, Soyo P4RC350 MB, Nvidia FX5200, 320W PS, Inverter & uSDC20D, 2.4GHz CeleronD320, 512MB DDR, 30GB 3.5", Pioneer 106s Slot DVD, Linksys WMP54G WiFi, Lilliput 7" & 4" TFT LCD, Zippy EL610 Keyboard, Touchpad, Garmin GPS V

                  Comment


                  • #10
                    Zowie!! So THAT'S what's wrong with my GPS?!

                    I recently installed a Xenarc to replace my old screen. The GPS is about a foot away from the screen, on the dash. Ever since I got the new system up and running, the GPS reception has been spotty. It drops satellites, loses it's lock and then regains it but always seems to struggle to keep track. I couldn't figure out what the hell was wrong with it.

                    This also explains why it worked perfectly on the back shelf of the car when I tested it with a laptop in the front seat and then it worked like ***** when I installed the computer directly underneath it. Never did figure that one out...until NOW.

                    I'll say it for everyone: I'm a moron. Thanks for solving the problem for me, guys!
                    Originally posted by ghettocruzer
                    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

                    Comment


                    • #11
                      possible fix

                      It sounds crazy, but I saw this posted in another thread, and it worked for me and my lilliput problem. If you have the refresh rate set too high <75+>, try lowering it to 60khz. This fixed my problem entirely. I can now have the GPS receiver practically on top of the Lilli without a problem. Hope it works for ya.

                      tjd

                      Comment


                      • #12
                        Thanks, I'll try it although setting the Xenarc to less than 75hz causes the 800X600 to display improperly on the Epia-10000. I may have to fall back to 640X480 and try it.
                        Originally posted by ghettocruzer
                        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

                        Comment


                        • #13
                          tried that

                          being a tech myself (not a car tech tho, lol) i tried this idea, but i noticed little or no difference in changing the refresh rates. dropping refresh to 60hz just made the screen a little less "sharp" looking, and not a whole lot else. The digitalww7vga model i have is defaulted to 60hz, so up the line i went, up to 72hz, cause 75hz wigs out the crappy vid card the laptop i was using has installed. now that i have a true PC (cause i have space in the rear of my car, and HATE slow comps, and cant afford a new lappy) i will re-try, but i doubt its going to help. Lucky for me, i have a sunroof, SO, when the weather is good, i stick the bu303 on the roof, when the weather is bad, it comes back in the car, much to my groans and moans, even tho i have waterproofed it, i just dont like it being out there, although i have left it on the roof during a storm a couple of times, and its worked just fine (after waterproofing, different story tho, sorry for my waffle).

                          anyways, it didnt help on carpc version 1, i will try with version 2...
                          Hilux Surf (4runner) install
                          false floor in rear housing;
                          4 channel amp
                          600w cont. inverter.
                          Also- DigitalWW 7VGA indash
                          headunit for FM/AM,DVD,SVCD,CD,MP3
                          P4 3.0 with low profile AGP card.
                          4x4" speakers (splits) in factory locations
                          BU-303 GPS

                          Comment


                          • #14
                            I had the same thing with my bu-303 and lilliput. You need to change the clock on the screen itself. Mine is like a total jammer when screen clock is around defult 50-52. It's also at it's sharpest. I have a full PC and board with NForce chip. The drivers have a option for auto tune and auto gain for LCD's where they display this pattern and you run auto's on the screen. Well that's where they were put and that's where they create GPS blackout zone inside my car. Outside(roof) will work, because the car is a shielde. Put it outside the window but still in sight of the screen and it will not work. But when i move the clock just past 55 i get 4 sats, past 57, i get 5 locks. My PC refresh rate is 85Hz, found to have least interference in the screen that way. Now i know why. It jams everything else around it. By using phase setting, i think the clock can be compensated, just a little part of the screen will be "off-screen", but hey it works.

                            Comment


                            • #15
                              bump!

                              has anybody else seen a better solution? perhaps a way to shield the GPS antenna and USB wire?

                              Comment

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