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Thread: Connexant TU40 D140 GPS receiver module

  1. 09-12-2006, 11:49 AM #1
    jasonsjwou
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    Connexant TU40 D140 GPS receiver module

    This module is on Ebay for $15 buy-it-now.

    I this forum with "TU40" "D140" and nothing shows up.

    Is this any good? Can I use this with the "shark fin" type roof antenna that you can buy from MP3CAR store?
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  2. 09-12-2006, 12:17 PM #2
    DarquePervert
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    Well, considering I can't find it on either EBay or Google, I have no idea. I also put in the correct spelling of Conexant.

    Perhaps a link to your EBay auction might help us glean more information about the module you're looking at.
    Have you looked in the FAQ yet?
    How about the Wiki?


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  3. 09-12-2006, 12:58 PM #3
    jasonsjwou
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    Too bad I can't change the thread title.. My bad.

    Well, I downloaded a "white paper" of this board. I don't know much of anything but the paper was written in 1998. So it'd be safe to assume that this thing was made before then.

    Has there been a leap of technology in GPS since 1998? If it works just like the ones I can buy today, then I'd buy one...
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  4. 09-12-2006, 01:38 PM #4
    DarquePervert
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    Again, I'll ask...

    Do you have a link to the Ebay auction? If someone could actually see more than just a chipset description, we might be able to give you more information.
    If you're not willing to give that up, then best of luck to you.
    Have you looked in the FAQ yet?
    How about the Wiki?


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  5. 09-12-2006, 03:56 PM #5
    jasonsjwou
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    This is the Ebay auction

    http://cgi.ebay.com/ws/eBayISAPI.dll...MEWA%3AIT&rd=1

    The PDF spec sheet from the Ebay link

    http://www.wireless-guy.net/Conexant_TU30_D165.pdf

    This appears to be the "white paper"

    http://www.ekf.de/c/cgps/cg1/info/jupiter.pdf
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  6. 09-12-2006, 04:33 PM #6
    DarquePervert
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    OK. Now we're getting somewhere.
    That appears to be an OEM GPS receiver unit.
    You'd need two things to get this working on your PC:
    1) An antenna. In regards to your question about the Hirschmann unit in teh mp3car.com store, it should work with this module, but you might need an adapter for the antenna. Thsoe are readily available, though.
    2) You would need to get the device to output to a serial port. The datasheet says it has a serial interface, but the photos don't show any connector. It's likely that the two rows of pins on one side of the board are for that purpose, but I'm not 100% certain.

    OK. After looking at the white paper, the two parallel rows of pins are for the serial connector. The white paper has pictures of the same unit (albeit a different revision) with a pin connector in that location.

    Will this work? Probably. You'd need to supply +5v power (available via a serial port) and have a serial connection. You're probably going to be doing some soldering, too.
    But for an OEM GPS receiver, that's not a bad deal, IMHO.
    Have you looked in the FAQ yet?
    How about the Wiki?


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  7. 09-12-2006, 10:11 PM #7
    jasonsjwou
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    Like you said, the Pin J1 - 11,12,15 and the power line are probably all the RS232 needs. Solder some header pins to connect to DB9 connector, and it should be usable.

    But.. I noticed something weird.

    Looking at the page 5 of the white paper, the Table 2. GPS receiver Navigational Accuracies.

    The accuracy is in the order of 50 meters! can this be right? I hope it's some kind of typo. May be they didn't put decimal place in front of 50... If it is 0.50 meters, then it would make perfect sense. But 50 meters... hmm.

    Also on the Page 4, Table 1, Time To First Fix.. the cold TTFF is 2 minutes. does this seem right? May be I should connect a small solar panel+NiMH battery and keep it "alive" all the time...

    All and all, with all these USB devices and peripherials, looks like I'll be quickly loading up my 5V from the PSU.. better patch in a POL PSU..
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  8. 09-12-2006, 10:14 PM #8
    DarquePervert
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    I'd think the 50m accuracy would be the distance from the receiver to the satellite, not the accuracy of your positioning. 50m over a distance of a hundred miles is pretty miniscule, and wouldn't amount to very much when your position is triangulated.

    Any other GPS gurus want to chime in here? I could very well be wrong on this...
    Have you looked in the FAQ yet?
    How about the Wiki?


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  9. 09-12-2006, 10:36 PM #9
    jasonsjwou
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    I'd certainly hope 50m would be the receiver-satellite accuracy... If the actual positioning accuracy is 50 meters, then this is completely worthless.

    Also, what benefit would I get if I add a "Preamplifier" mentioned in the white paper? will the reception under bad weather improve? I wonder what the requirements of the Preamp is..
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  10. 09-13-2006, 02:29 AM #10
    shldn
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    50 meters would be the positioning accuracy. i read somewhere civilian gps has an accuracy of 30 mts.
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