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Thread: External aerial with GNT-120 or SiRFIII

  1. #1
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    Question External aerial with GNT-120 or SiRFIII

    Hi folks,
    I've googled and searched; but am short on info, and expert knowledge in this area.
    Could anyone help by advising whether it is possible to use an external aerial with GNT-120 bluetooth GPS receiver, please?
    ~I think it's the SiRFIII type.
    There is no 'antenna port' but perhaps USB possibility??
    Spec sheet which gives very basic details can be found here, for what it's worth: <url>www.mobilefun.co.uk/download/manuals/BT_GPS_Quick_Guide.pdf</url>
    although mine came in unmarked box with no instructions from everyone's fave auction site, 2ndhand! It looks like it's that one, in good order & works.
    A very similar (superior) device by the same name (GNT-120) is shown here:
    <url>http://www.ytec.com.tw/military/pdf/EndProducts(GNT)/GNT-120.pdf</url>
    These specs say "Antenna Type: Built in Patch Antenna, extended active antenna (MMCX)"; but on the model I posses this port is not there!!

    It would be extremely useful to be able to boost the reception, which is prone to dropping out (not just in tunnels).

    Thanks.

  2. #2
    Neither darque nor pervert DarquePervert's Avatar
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    First of all, you don't need an external antenna for this unit. From what you say, it sounds like you are already aware of this.

    If you can add an external antenna to this unit, you'd have to open the unit up and there would be a port on the circuit board. If there is not a port, there may be a location to solder in a port.

    If the receiver is dropping out, you might consider a different location in your vehicle. Make certain it has a clear view of the sky and is ideally not behind any metallic-based window tint.
    I have a different GPS unit, and the receiver sits on my dash and I get rock-solid satellite reception.
    Have you looked in the FAQ yet?
    How about the Wiki?



    Under normal circumstances, a signature would go here.

  3. #3
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    Thanks for advice and info (Darque Pevert)
    Quote Originally Posted by DarquePervert View Post
    First of all, you don't need an external antenna for this unit. From what you say, it sounds like you are already aware of this.
    If the receiver is dropping out, you might consider a different location in your vehicle. Make certain it has a clear view of the sky and is ideally not behind any metallic-based window tint.
    On dash, clear unimpeded, unobstructed view - still drops out more often than would be convenient. We have no heated front screen, and the front window has a very marginal (non mentallic) tint, although other windows are slightly darker

    The fact that the identically named (GNT-120) unit at http://www.ytec.com.tw/military/pdf/...T)/GNT-120.pdf
    was built with an external antenna port, suggests someone thought it's inclusion a worthwhile idea, for whatever reason! They state "improved satellite reception especially in urban canyons and under foliage"
    Quote Originally Posted by DarquePervert View Post
    f you can add an external antenna to this unit, you'd have to open the unit up and there would be a port on the circuit board. If there is not a port, there may be a location to solder in a port.
    Thought that should be possible; with the right info, I can accomplish any necessary mods, assuming they are possible with my unit's specifications and board - I'll have to take it to bits and try to run down the serial number of the innards. I assume there is no port & I'll need to add one...
    I found a pic of the SiRF III board at wiki, along with article which is some help
    But it shows the less interesting side of the board!

    Chopping a hole in the casing is no prob, I can solder; just need to know which connections, and what port - generic MMCX or something specific?.

    Any advice - or location of info on which connections, or what I'd need to do would be invaluable, and most gratefully received!!


    thanks Yada

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