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Thread: Gps won't get a fix

  1. #11
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    yes 4800 is correct just make sure you have the right com port selected and that it does not change on you

  2. #12
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    I had an identical problem with my old Sony Skymap GPS. It worked fine for about 1.5 years then would not get a lock to save its life. I dont think I was ever patient enough to wait more than 5 minutes before giving up. No problem, time to replace it as it did not output in NMEA.

    I then got the Delorm Earthmate (USB). After a while this one exibited the same problems you described, it would take forever to get a fix but then it was ok (but not great), until I powered it off and back on. It would take anywhere from 5 minutes to 30 minutes to get a fix.

    For my sony skymap GPS, some people said the internal battery could have gone dead. This battery maintained the last known location so that it did not have to do a cold start every time. I never bothered to look in the sony GPS. I did look for a battery in the Earthmate and did not see one. Even if it was the battery the cold start should be under a minute. Unfortunatly the car the Earthmate was in burned up so I no longer have that GPS to test.

    It seems unlikely that the GPS location is the problem since it was working previously. Just to be sure, try hooking it up to your home PC such that the GPS has a view of the sky. If that works at least you can rule out the GPS hardware. If the GPS hardware looks good, check all your settings in your GPS software / port emulators if you use them. If they all look good then perhaps you installed something else in your car that is causing some serious interferance, perhaps new car stereo equipment? Maybe your carputer has a loose ground (I heard rumors this can cause interfance, who knows, double check it just in case).

    If you hook the GPS up to your PC and it does not work even after you play with all your software settings, try different mounting positions. Try putting a large piece of metal under it and see if that helps. It may be a wive's tale that metal helps the signal but give it a shot. Did you splice into the wiring at all on the Holux to extend the cable or get power from another source? If so then maybe you need to replace your extended cable section with shielded wire. I once tried to extend some front panel audio cables with un-shielded wire and the results were disaterous. The shielded wire made all the difference.

    Good luck and keep us up to date.

  3. #13
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    Thanks for your huge reply! I found out what the problem is. I've phoned the local holux dealer and it seems that there was a batch of bad holux units last year.

    He gave some serial numbers and mine was amongst them. Later editions have improved firmware without the problems.

    since I don;t have the receipt and the box I had a serious problem

    to fix the stupid problem i've just fixed a constant 5v power wire to the GPS. This way the gps keeps his fix even with the computer powerd off .. it's a stupid solution, but it works

  4. #14
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    Thats a crappy problem but at least you know what the problem is. How do you have that thing powered? I assume its always getting powered even with your car off. Your Holux should run on 4.5 to 5.5 volts. Maybe 4 AA batteries (at 1.2v each, rechargables) wired in series could get you the 4.8 volts you need.

    The Holux draws 80 mA. None of my nearby AA batteries list an output rating in amp hours but another post on the internet lists 5000 mA hours for a AA. That means with 4 AA we would theoretically have 20000 mA hours / 80 mA = 250 hours or 10.4 days of running the GPS non stop before having to replace the batteries. Seems reasonable to me although in the real world I am sure you would get something less than 10 days, even having to recharge your batteries every week is not sooo bad.

  5. #15
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    I'm using my car battery to power the unit. It's a 65AH battery so it SHOULD keep the unit standby for +/- 30 days without starting the car. It works flawlessly

  6. #16
    FLAC Jahntassa's Avatar
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    Yeah, I have an old rand McNalley serial GPS that took forever to get a fix. So I wired it so it's always got a 5v feed. I killed the battery a couple of times, but now I have a switch so I can kill power to it if i'm not going to drive the car a few days.

  7. #17
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    Quote Originally Posted by rezzen
    The Holux draws 80 mA. None of my nearby AA batteries list an output rating in amp hours but another post on the internet lists 5000 mA hours for a AA. That means with 4 AA we would theoretically have 20000 mA hours / 80 mA = 250 hours or 10.4 days
    20000mAh only in parallel, in series to get the 4.8 Volts you would only have 5000mAh. So only a quarter of the time your calculating.

  8. #18
    FLAC ShawJohn's Avatar
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    My Holux GR-213 only started behaving like a cock when I installed an updated driver off their site that superceeded the one on the CD... And I have lost the CD

    Now if PC is off for more than about 4hrs the GPS will not lock on or even report it is present until I re-sync protocol & baud rate in SirfDEMO. I also CAN'T change it back to NMEA mode

  9. #19
    FLAC ShawJohn's Avatar
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    Update,

    GPS will lose lock until I manually re-sync the protocol in SirfDemo. And it does this every time the GPS loses power from the PC

    Any ideas, holux not answering emails... Surprise surprise

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