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

  1. #21
    Maximum Bitrate BarryWoods's Avatar
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    Quote Originally Posted by Wiredwrx View Post
    I would also cut the antennas pigtail shorter and add a high quality N connector (if I had room to hide it) and make a cable from the evdo card to the pigtail from something like lmr-400 (which is expensive, as the connectors for it are also), but would most likely use some rg8, maybe some 8x, because of the price, and because of the flexibility and the cost of the connectors.

    But, even without it, I think Red will benefit from the antenna if she can get it connected to her evdo card.

    Michael
    Don't use RG-8 for microwaves. Bad juju.

    If you are going to use a kr1, just mount it where you can get to it easily and pull the card when you want to use it with your laptop away from the car.
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  2. #22
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    http://www.evdoforums.com/about615.html&highlight=5740

    Barry - that was the point of getting the KR1, so that I could take the card with me.

    I made the comment about adding an antenna to the card because I didn't want to make the card a perminant part of the car....by wiring the antenna to it perminantly...

    if there was a quick connect option out there....

    searching found this thread: http://www.evdoforums.com/about615.html

    reading through it right now
    Jan Bennett
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  3. #23
    Maximum Bitrate yrean's Avatar
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    I totally understand why you wouldnt want to pay another 200. I just did, but i was ready for an upgrade and a new contract.

    If you dont want to hack it you need to buy some sort of signal amplifier or booster. it recieves the 1900mhz signal and amplifies it so the card can connect. Most cell phone stores have these in there ceilings. so while your inside the store you have awesome signal strength. i had 100% in the store when i bought mine 2 years ago without the external antenna, but 0% when i was down the street.

    anyhow if you dont want to hack the card thats what your looking for, but there also like 200-400 bucks. most of the ones i see plug into the antenna jack. but i know they have free air ones.
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  4. #24
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    Wiredwrx's Avatar
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    Hmmmmm, he got me thinking.

    I remember years ago I read an article by a well respected Ham Radio operator, about a "pasive" repeater. You know, the kind that has an antenna on the inside AND the outside of the car connected by a cable.

    So, I went and I found the article, it is here http://www.repeater-builder.com/tech-info/passive.html

    The article might have some technical references or terminology that might be confusing to some people, but the gist of the article is that he had great success using it in his application. Perhaps there is room for some testing of the concept.

    This might be work for people who can/will/prefer not to hack thier card.

    Michael
    ...I love the French language...especially to curse with...Nom de Dieu de putain de bordel de merde de saloperies de connards d'enculés de ta mère. You see, it's like wiping your *** with silk, I love it.

  5. #25
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    hrmmm - I'm not a fan of having to run a bunch of antennas...lol

    reminds me of those strange guys running down the road with something like 20 antennas hangining off of their cars...lol

    however, if I could find something small and unobtrusive, I'd deffinately consider it.

    So basically, what something like this would do is take the signal and amplify it over a smaller area? Say inside or right around the car? So not only would the card get a better signal, but the cell phones as well?
    Jan Bennett
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  6. #26
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    http://www.ultimatepassage.com/cgi-b...000MR-10A.html

    Something like that?

    I'm looking at this image:

    http://digitalantenna.com/DA4000MR-10A_box.html

    I notice that the antenna is completely seperate.

    I'm wondering if instead of having to run that antenna compltely seperate, if I could run the antenna that I bought from the store here instead? http://store.mp3car.com/SearchResults.asp?Cat=39

    I understand needing to keep antennas seperated, however, since that antenna has 3 combined I'm guessing it's got something going on to help prevent interference? I know that it will require a conversion on the connector to the rest of the amplifier.
    Jan Bennett
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  7. #27
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    Quote Originally Posted by BarryWoods View Post
    Don't use RG-8 for microwaves. Bad juju.
    what kind of cabling would you recomend for something like this? I do know that when you try and cut coax then solder it back together, you usually end up with bad connections, since coax isn't great for something like that.

    If RG-8 is bad, and the cable that's on there now is RG 174.

    I'd be interested in making the change, if I can do so without compromising the integrity of the cable.

    Say, if there's an adapter that I can use on these instead of soldering them back together?
    Jan Bennett
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  8. #28
    Maximum Bitrate BarryWoods's Avatar
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    Quote Originally Posted by Red GTi VR6 View Post
    what kind of cabling would you recomend for something like this? I do know that when you try and cut coax then solder it back together, you usually end up with bad connections, since coax isn't great for something like that.

    If RG-8 is bad, and the cable that's on there now is RG 174.

    I'd be interested in making the change, if I can do so without compromising the integrity of the cable.

    Say, if there's an adapter that I can use on these instead of soldering them back together?
    Like I said, most of my experience is with microwave cable. Most of the stuff I use is LMR-400, it's about as big around as your thumb and has a minimum bend radius of about 8 inches. RG-174 is made primarily for pig-tails, usually less than 20 inches long. If you can mount the radio that close it should be just fine.

    Right now I'd just get the KR1, and just see how well it works stock. No need to fix it if it ain't broke. The KR1 is made by D-Link, so it's antenna has a rp-sma connector. That's the same connector I have on my modified orinoco card, and what I used to modify my old Zaurus. If you have a comp-usa in the area, Hawking makes some stuff that will work with it. They should have pretty much all you need if you do decide you need more antenna power.


    Read this a while back in Make mag.

    http://www.stompboxnetworks.com/

    The idea is the same, he's using a stompbox instead of a KR1.
    Failure is not an option....



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  9. #29
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    thanks for the info! I'll start reading up on it!
    Jan Bennett
    FS: VW MKIV Bezel for 8" Lilliput - 95% Finished

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  10. #30
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    Id be curious on what you come up with Red, the wifey has a MKv GTI which we did an install on and currently the gps dongle is in the dash above the lcd and the pc-card from verizon is in the pcmcia port on the mb which currently is in the glove box cleverly placed. The reception is so-so but i have yet to see any devices which would allow me to add an antenna on to the card to hook it up to the receiver from the store which you were looking at. The same goes for the Radio Shark that we have, as the antenna for that is built in. Let me know if you come up with anything as i will do the same.
    My purpose in life... to do everything the wifey says too... or atleast thats what she tells me :P

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