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Thread: bu-353 satellite fix problem, no fix anywhere !

  1. #1
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    bu-353 satellite fix problem, no fix anywhere !

    hey everyone, apart from having the most updated drivers for the bu-353, when i load GPS information the software provided,
    and centrafuse, my bu-353 seems to not get a fix anywhere outside and even at different locations no matter how long it scans,

    anyone have any ideas or have I bought a faulty bu-353 ?
    the thing i I did have a dodgy ebay gps receiver, at that manages to establish a signal when in gps mode for centrafuse ...
    have I dont something wrong ?
    settings are correct with baud of 4800, 8 bits stop bit 1, and parity none,

    com port correctly detected aswell GPS information seems to not get any fix at all

  2. #2
    Neither darque nor pervert DarquePervert's Avatar
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    Can you open up a terminal (like HyperTermnal built into XP) ont hat COM port? If you do you should see the raw data stream from the GPS, even if it's not getting a lock.
    If you're getting gibberish or nothing at all, your BU353 may be defective.
    Have you looked in the FAQ yet?
    How about the Wiki?



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  3. #3
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    i am getting a stream of data from GPS information, most times in the other window i get satellite numbers with green and red circles but no lock http://img72.imageshack.us/img72/5850/gpsmd3.jpg

    heres a sample of the raw dump i get from GPS information


    $GPGSA,A,1,,,,,,,,,,,,,,,*1E
    $GPGSV,3,1,12,24,83,340,28,09,83,161,29,21,38,323, ,29,30,224,*71
    $GPGSV,3,2,12,26,30,005,,06,29,225,,15,24,325,,10, 23,075,*75
    $GPGSV,3,3,12,02,22,145,,05,21,181,,30,12,196,,18, 08,319,*72
    $GPRMC,115421.949,V,,,,,,,190108,,*28
    $GPGGA,11542

    heres a sample of what i get from the hyperterminal

    †`````````xffx``````x`ff`ffff```````f````
    ``````f``````f````````````````````f``
    ```````````

  4. #4
    Neither darque nor pervert DarquePervert's Avatar
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    Well, that's not NMEA data. That's Sirf data, I believe.
    You need a tool to switch from SIRF mode to NMEA mode so your GPS application can read the NMEA data.

    SIRFDemo can do this, I'm pretty certain.
    Have you looked in the FAQ yet?
    How about the Wiki?



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  5. #5
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    Any updates? I'm not getting a fix anywhere either...

  6. #6
    FLAC
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    Quote Originally Posted by UnkellSam View Post
    Any updates? I'm not getting a fix anywhere either...
    I'm sure DarquePervert will give you hell for digging up an old thread, but, I've also gone through this problem so I'll answer. That way next time someone searches, we know they'll find it.

    Anyway, GPS pucks can get a lot of interference and a lot of obstruction. Mine would get a fix one day, then not work for two weeks, then get a fix for a little while, so on and so forth.

    What ended up fixing it was putting the puck outside of the car. Away from all interference. Even though the prior location had been on the rear deck.

    Try moving the puck outside and then give the thing up to 2 minutes to get a fix. Make sure you're not in a garage at the time. That will let you know what's really up.

    Also, you don't give very much information, so you could have the wrong com port set. I don't know what your knowledge level is or how far you've chased this problem yourself.
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  7. #7
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    Well, I don't know too much about GPS. My car is a convertible, and with the top down I still don't get a fix. I'll try placing it on the outside of the car to see if it helps, but its definitely not how I would like to have my permanent setup... If my cell phone gets GPS signal, then I would expect a dedicated GPS receiver to be able to as well. Especially considering people are reportedly getting signal with this receiver inside buildings. I'm in urban Los Angeles, not an obscure mountainous region or anything.

    My OS is Windows 7 32 bit - With the GPSInfo software I only have red circles and "No Fix". There's is an ongoing string of text displayed in the GPSInfo software when I activate the com port.

    In GPSInfo I am set to com port 6 - that is where the receiver is set to - I did a scan in GPSInfo and it locates the receiver on com 6 with no problem...

    I'll try reinstalling the drivers, maybe thats where the problem is...

  8. #8
    FLAC
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    What is the baud rate set at? It should be 4800. Sometimes the buggers set themselves to 9600.
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  9. #9
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    Quote Originally Posted by PaulF View Post
    What is the baud rate set at? It should be 4800. Sometimes the buggers set themselves to 9600.
    It is set to the default 4800.

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