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Garmin 20x works on laptop not carputer...why?

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  • Garmin 20x works on laptop not carputer...why?

    GPS was working when first installed...now it's not.

    When I first installed Mobile PC with the 20x it took more than 30mins to acquire satellites for the first time. After that it acquired them ok. Not as fast as the wifes Nuvi though.

    It was getting full signal with it placed just under the plastic dash. Now, nothings changed, it gets no signal unless I place it outside the car. Even then it's not full strength.

    Next I took an older laptop and loaded it. Connected the 20x and BAM, full strength signal with it in the car. So I remove all Garmin software from the carputer and reload. Still nothing. No signal with it inside the car and weak signal with it outside.

    What's going on here? Is it something to do with the usb ports on the carputer? Not enough voltage or something? The other usb things are touch screen, mouse for volume and a hub all working fine. I even unplugged everything and still no luck.

    Anyone else have this kind of problem?

    Thanks,
    davidk

    carputer:
    Intel d510mo
    Garmin Mobile PC 5.00.60
    XP

    Laptop:
    Dell Inspiron 6800
    Garmin Mobile PC 5.00.60
    XP

  • #2
    first i would check if the carputer is using usb 2.0 and not just 1.1 in bios, then make sure i had latest drivers from web for chipset/usb ports if there are any. next i would make sure the port in control panel is set to 4800 thats all i got for now SNO

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    • #3
      Thanks for the ideas.
      I checked the USB ports and I believe they are all 2.0. I'm only using ports from the motherboard and they say "Enhanced" in the device list in XP.

      I'll check again for updated drivers. I downloaded drivers when I loaded the system 2 months ago.

      I'm not sure there is a place to set the port speed. The thing shows up as a USB device, and I don't see any software that's emulating a serial port.

      Last night I checked the bios and USB legacy support was disabled. Which is correct I think. I unloaded the software and reloaded it and now it's working. Not as strong a signal as when on the laptop but it is working. As soon as I can get a backup of my song library I'm going to wipe the drive and start over. Getting the latest drivers and loading just what is needed. I did some experimenting with a few things so there's bound to be some unnecessary software on it now.

      Thanks for your help.
      davidk

      Comment


      • #4
        sirfdemo is the ticket
        I used it to change my settings and what not.
        There was another software I used but ... it's on my XP machine.

        From what I understand, the BU-353 pod takes forever to cold start. Something like the internal battery goes into hibernation or something strange like that. However, once you have it active every other day or so, it should pick up the circling spy bots within 60 seconds ... normally.

        good luck!

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        • #5
          David, are you using the same car now as before? Some cars use tinted windows with metallic content which unfortunately blocks signals from GPS satellites.

          The successful tests with your laptop, were they done inside the same vehicle?

          USB voltage could be an issue as you mentioned. Are you using a (very) long USB cable?

          __________________
          Garmin Mobile PC

          Comment


          • #6
            Thanks guys,

            The SIRFDEMO software I don't think will work with the Garmin 20x antenna. I don't think it uses a com port. I'm not using a BU-353, it's the Garmin 20x that comes with the software.

            All tests were carried out in the same '11 Outback. With the antenna sitting on the dash, the laptop was getting full bars for reception. Using the carputer I now get one less than full. Much better than the zero bars I was getting before reloading the software.

            Thing is, nothing changed from working to not working. It was working on the way home...park the car in the garage...next day, no reception - nothing (even rebooted and removed the Garmin device and rediscovered it). Unless it was placed outside on the windscreen, and even then it was getting only one or two satellites. I'm not using any extensions to connect it. I believe it has a 1meter chord and it's plugged into a port on the system board.

            I removed and reloaded the Garmin software last night and today it's functioning. We'll see how long that lasts.

            I initially got a 353, and had good reception I think, using just the software that came with it. It just setup the com port and showed how many satellites you could see. I never had it working with any mapping software. I was trying to find an open source version but could not get them working or couldn't download open maps. I ended up buying Garmin Mobile PC with the 20x antenna. With how many times I envision changing the system, I figured it was best to get the version where the antenna was the key.

            Thanks for the support guys,
            I'm going to keep testing to see if I can get better reception.

            davidk

            Comment


            • #7
              Do you have any new electronic device inside your car which could cause RF interference to the GPS20x? If yes, try to keep them further apart from each other. Otherwise just try to optimize the location of the 20x by keeping it close to window, away from CarPC, etc.

              __________________
              Garmin Mobile PC

              Comment


              • #8
                Yeah, nothing new in the car. It's been working today but the signal strength has been steadily going down. Drove the car three times for 20miles each. On the last leg, it had lost signal completely by the end.

                I'm going to test the laptop again and then just reload the carputer. Maybe make a header for the internal usb ports on the system board (need to do that anyway for the joycon and Boozbox coming in a few days).

                I hope I can find a reason and not that it just magically works.

                Thanks,
                davidk

                Comment


                • #9
                  I don't think reinstalling of any software on your carputer will correct this issue. I still suspect some RF interference, or some hardware-related issue. Good luck, and do let us know when you solve it.

                  Comment


                  • #10
                    Originally posted by Marvin Hlavac View Post
                    I don't think reinstalling of any software on your carputer will correct this issue. I still suspect some RF interference, or some hardware-related issue. Good luck, and do let us know when you solve it.
                    I agree....

                    Try putting the GPS receiver out of the car, I put it away from my computer because of RF interference CarPC....

                    Comment


                    • #11
                      First off, I'd really like to thank all of you for your patience and help.
                      I think I may have found a solution, if not the cause.

                      I was testing stuff last night and was holding the antenna out the window. Getting good reception, I shifted it in my hand and my fingers covered it for a moment. At that moment I saw all the satellite bars drop. Can this thing be that sensitive?!

                      Now, the reason I was struggling with this was because the carputer WAS getting signal but it would decrease with time. Seems odd that it would be antenna placement with it working like that. And again, with the antenna in the same position the laptop worked better.
                      What I didn't take into account was to hook up the laptop I had to remove the carputer screen from the dash. That must have been just enough to cause it to start working. I was thinking primarily about stuff covering the antenna causing the problem.
                      The antenna was to the left of the carputer and display under the dash. Last night when moved it to the corner of the dash it got great reception.
                      So I removed the glove box and moved the antenna to the very front corner under a speaker grill. I'm now getting great reception. Time will tell if it decreases like before, but for now everything's working.

                      I'm somewhat embarrassed that it might turn out to be something so simple. But with it working and slowly not working it just didn't seem to be a placement problem.

                      Thanks again for helping with this.
                      davidk

                      Comment


                      • #12
                        It was in your dash?
                        If that was the case being in-sight with the sky is going to be way better.
                        I tried in house and didn't get much. Put in on my dash and bingo!

                        GMPC works fine with the BU-353 ...

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                        • #13
                          Good work, Dave. Humans cannot see RF waves, so it is not easy to ID these issues sometimes. Congrats on fixing it.

                          __________________
                          GPS Software

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                          • #14
                            It's better to put the CarPC in a metal case to avoid RF interference causing disturbance to other components....

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                            • #15
                              Metal case..check.
                              http://www.mp3car.com/vbulletin/show...ew-system.html

                              My thinking was the dash is plastic. Plastic is invisible to RF, right? The antenna was to the left of the PC by about 6". Under the dash just above the instrument cluster. Some of the times when I was testing I'd place it in the same position but on top of the dash.

                              Now it's still under dash plastic but away from the PC. It seems to be working great right now. I just pulled it out to prepare for the new radio and joycon.

                              Thanks,
                              davidk

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