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Thread: Hacking a EVDO card to add an external antenna?

  1. #1
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    Hacking a EVDO card to add an external antenna?

    So I'm looking at this antenna from the MP3Car.com store.

    I'm wondering if there's a way to attach the Cellular pigtail to the EVDO card that I have, here.

    Does anyone know if this is possible? Has anyone done it? I know nothing about how these things really work, but I have no problem hacking into it if I have a guide...

    anyone?
    Jan Bennett
    FS: VW MKIV Bezel for 8" Lilliput - 95% Finished

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  2. #2
    Maximum Bitrate BarryWoods's Avatar
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    I'm still trying to figure out why they aren't using microwave rated connectors for the wifi antenna. Doesn't sound like a very good quality antenna. Unless the description on the store page is wrong. Okay, found the site. It uses RG-174 coax, which at 2.4Ghz you lose 7.5 db of signal with only a 10 foot run of the stuff. That's not counting the 0.31 db for the connectors. This is assumeing you only need 2, one for the antenna, and one for your card. So even if you have one of the cool beans 200mW Senao cards you only have 16.19db of signal. Instead of 23db.
    Failure is not an option....



    It's installed by default on every version of Windows.

  3. #3
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    very good to know Barry!

    Thanks a bunch!
    Jan Bennett
    FS: VW MKIV Bezel for 8" Lilliput - 95% Finished

    Please post on the forums! Chances are, someone else has or will have the same questions as you!

  4. #4
    Maximum Bitrate BarryWoods's Avatar
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    Quote Originally Posted by Red GTi VR6
    very good to know Barry!

    Thanks a bunch!

    Hey no problem. Now if you're not going to use it for wifi, it looks pretty cool for the gps and cell. That would be pretty handy to only have one hole for the antenna. I usually just stick my external antenna for my wardriving rig in the back window of my car. It isn't trully "omni directional" that way, but I have no problem connecting to my home, work, or wife's, wireless networks. I've been meaning to hack up a wifi usb dongle directly to a larger antenna. The less coax the better. Right now I'm using a 6' piece of LMR-400 for my pigtail between my laptop and antenna. I get a little loss but not too bad. I don't usually connect to my networks from the car that often though. It's faster to just walk in and hook up the wires. Gigabit is a hell of a lot faster than 802.11G.
    Failure is not an option....



    It's installed by default on every version of Windows.

  5. #5
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    do you know of any antennas that would work that have the functions of the one I posted?

    The deal about the signal strength makes complete sense.
    Jan Bennett
    FS: VW MKIV Bezel for 8" Lilliput - 95% Finished

    Please post on the forums! Chances are, someone else has or will have the same questions as you!

  6. #6
    Maximum Bitrate BarryWoods's Avatar
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    Quote Originally Posted by Red GTi VR6
    do you know of any antennas that would work that have the functions of the one I posted?

    The deal about the signal strength makes complete sense.

    That's the only antenna I've ever seen that combines all three into one. My eventual plan for my computer, when ever I get around to building one, is the gps receiver on the dash and my hacked wrt on the roof. If you don't want to be able to see the gps, you could do like I've seen here on the forums and put it under the front speaker grills. It will kill some of the gps signal, but it shouldn't be too bad. I figure if you can't find it within 50' with a gps, you ain't going to find it ever... I'm not planning on doing a external cell phone antenna, so I've not researched them very much.
    Failure is not an option....



    It's installed by default on every version of Windows.

  7. #7
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    Quote Originally Posted by BarryWoods
    If you don't want to be able to see the gps, you could do like I've seen here on the forums and put it under the front speaker grills.
    What speaker grills? Not all cars have speaker grills in the dash...

    I'm looking to go with an OEM GPS install, thus the reason for an antenna like this. there's an OEM VW antenna that combines GPS/FM/XM (I believe it's XM, might need to go back and check that)...but alas, it doesn't have half of the stuff I want.

    I'm looking for an integrated solution for all of this. The router will be taken apart and molded into the center console.

    The Cellphone antenna part of it I could honestly care less about as I don't believe I have the ability or the option to adapt it to anything with my phone.

    So that just leaves me with GPS and Wi-Fi...

    thanks for the extra information!
    Jan Bennett
    FS: VW MKIV Bezel for 8" Lilliput - 95% Finished

    Please post on the forums! Chances are, someone else has or will have the same questions as you!

  8. #8
    Maximum Bitrate BarryWoods's Avatar
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    Yea, I wrote all that then hit your site. Looks like you guys know your way around fiberglass. As long as you don't need really long range for the wifi, you could build a custom gps antenna shroud that also houses a usb wifi dongle. No worry about signal because the radio is already outside the car. Hell depending on which gps you get there might be room inside that.
    Failure is not an option....



    It's installed by default on every version of Windows.

  9. #9
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    the main reason I'm looking for the wifi is to broadcast the signal to the cars around me while going down the highway. that way when we're caravaning to shows across the country, those in the other cars can pick it up and get online if needed/wanted. Yea, it won't be all that fast, but it's something. And on a 24 hour drive, that's a lot....lol
    Jan Bennett
    FS: VW MKIV Bezel for 8" Lilliput - 95% Finished

    Please post on the forums! Chances are, someone else has or will have the same questions as you!

  10. #10
    Maximum Bitrate BarryWoods's Avatar
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    If that's all you want it for I'd just use a linksys wrt to do it. That will give you waaay more range than what any usb or pcmcia card would. They are kinda made for that. The one I use in my car is powered off a multi-voltage lighter adapter. Works just fine. I don't use it as an access point but it won't matter. Just throw it in the back window when you guys are caravaning, and pull it out at the show. I built a power over ethernet adapter so I only have one wire going to the back of the car. Works great.
    Failure is not an option....



    It's installed by default on every version of Windows.

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