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

  1. #11
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    Which connection card do you have? Your link just directs me to the general page....

    do you see an external antenna port on your card? its a very small circle on the edge somewhere... if so you can get that antenna, along with a FME to U.FL pigtail. That antenna has a FME connection on the end according to the details listed for the cellular.

    I have another external antenna with that pigtail and it dramatically improved my service.
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  2. #12
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    no external antenna on the card. I'm running the PC-5740. Sorry about the link, here's a valid one: link

    Thus the question about hacking the card.
    Jan Bennett
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  3. #13
    Maximum Bitrate yrean's Avatar
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    i totally iunderstand. the 5740 has no external antenna port. I just upgraded to the KPC650 card itll be here tomorrow.I was using the 5220 card but the KR1 and it dont really get along and I was done with the 2yr contract so it was time for something new. verizon was trying to jam that 5740 down my thoat, but the reviews on that card werent all that good and I always use the external antenna with my card. so that card was a no go. Im not sure if there is any way to hack that card to add an external. If anyone would know it would be at the evdoinfo.com site When i first got my card that site helped alot. they also have stuff about the kr1 there red. I wish I knew more to help you out. I would of told you to return it and switch it in the trial period if i would of seen this sooner. Sorry.,
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  4. #14
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    Red, I am gonna have to disagree (I think it disagrees) with Barry.

    I checked this website http://www.timesmicrowave.com/cgi-bin/calculate.pl and found that the loss for 10 feet of RG174 is only 4.3 db, not 7.5. That difference is quite significant, since 3 db is the difference between double/half the power, and that is at 2.4ghz. HOWEVER, you plan to use your EVDO card from Sprint, and this card works on 1900 mhz, where the loss is even less, only 3.8 db.

    While the antenna for the Cellular portion has no "gain", it does have a high db of return loss, which is actually a good thing, eventhough it seems counter intuitive.

    You could always run a thicker coax to the antenna, with a much shorter pigtail on the antenna instead of the 10 feet of rg174 is it is that important, but I think overall, that antenna will provide a significant benefit for the following reasons,

    If the antenna is on the trunk or roof, or even on the rear parcel shelf (if you mount some metal plate of some sort below it) you will increase the groundplane of the antenna, whiuch will aid in tranmissions and reception of signals.

    Also, you can place the antenna in a place that it is unobscured. Radio signals in the 1900mhz spectrum tend to be obsorbed by materials easier then frequencies in the lower part of the spectrum. That will aid in transmission and reception.

    And of course, the old addage that Height Is Might. Basically, the higher the antenna, the better the reception and transmission. If you mount it on the roof, that will be higher then the floor of your trunk, or basically, any other place in your car.

    As for your card, will take a websearch (which I have a feeling you have already done) or a disassembly. There are lots of tutorials on the web to add antennas to wifi cards. I tend to think that the antenna portions will be relatively similar, and you might be able to apply the methods from the other cards to your 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. #15
    Maximum Bitrate BarryWoods's Avatar
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    Quote Originally Posted by Wiredwrx View Post
    Red, I am gonna have to disagree (I think it disagrees) with Barry.

    I checked this website http://www.timesmicrowave.com/cgi-bin/calculate.pl and found that the loss for 10 feet of RG174 is only 4.3 db, not 7.5. That difference is quite significant, since 3 db is the difference between double/half the power, and that is at 2.4ghz. HOWEVER, you plan to use your EVDO card from Sprint, and this card works on 1900 mhz, where the loss is even less, only 3.8 db.

    While the antenna for the Cellular portion has no "gain", it does have a high db of return loss, which is actually a good thing, eventhough it seems counter intuitive.

    You could always run a thicker coax to the antenna, with a much shorter pigtail on the antenna instead of the 10 feet of rg174 is it is that important, but I think overall, that antenna will provide a significant benefit for the following reasons,

    If the antenna is on the trunk or roof, or even on the rear parcel shelf (if you mount some metal plate of some sort below it) you will increase the groundplane of the antenna, whiuch will aid in tranmissions and reception of signals.

    Also, you can place the antenna in a place that it is unobscured. Radio signals in the 1900mhz spectrum tend to be obsorbed by materials easier then frequencies in the lower part of the spectrum. That will aid in transmission and reception.

    And of course, the old addage that Height Is Might. Basically, the higher the antenna, the better the reception and transmission. If you mount it on the roof, that will be higher then the floor of your trunk, or basically, any other place in your car.

    As for your card, will take a websearch (which I have a feeling you have already done) or a disassembly. There are lots of tutorials on the web to add antennas to wifi cards. I tend to think that the antenna portions will be relatively similar, and you might be able to apply the methods from the other cards to your card.

    Michael
    I've seen it from 1.7 to 6. It really just depends on where you look, and the quality of the cable. Personally I wouldn't use rg174 for anything longer than a foot. It's really not made for 2.4Ghz. I really have no experience with evdo so I didn't comment on it. All my cables are lmr-400, even the one I use in my car. I have a couple spools of it in the garage, so it's also the easiest for me to get. Though I'm not trying to hide it, and really don't worry about how it looks at the moment. I'm more of a function over looks kind of guy. As for placement of the antenna, Wiredwrx hits it on the nose, higher is better. The roof would be best, following with the trunk. Either of these and you automatically have a ground plane. Inside the car will work, but you won't get the range as having it outside.
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  6. #16
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    Quote Originally Posted by BarryWoods View Post
    I've seen it from 1.7 to 6. It really just depends on where you look, and the quality of the cable. Personally I wouldn't use rg174 for anything longer than a foot. It's really not made for 2.4Ghz. I really have no experience with evdo so I didn't comment on it. All my cables are lmr-400, even the one I use in my car. I have a couple spools of it in the garage, so it's also the easiest for me to get. Though I'm not trying to hide it, and really don't worry about how it looks at the moment. I'm more of a function over looks kind of guy. As for placement of the antenna, Wiredwrx hits it on the nose, higher is better. The roof would be best, following with the trunk. Either of these and you automatically have a ground plane. Inside the car will work, but you won't get the range as having it outside.
    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
    ...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.

  7. #17
    Maximum Bitrate yrean's Avatar
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    she will definitly benefit from an external antenna. With no antenna connected to my 3g card, I have 1% to no signal. With the external antenna, I have anywhere from 25% to 75% signal strength. no joke. Every other card they sell has an external antenna port, except for the card red got.
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  8. #18
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    I'm guess what y'all are referring to is to connect the Cellular part of the antenna to the EVDO card, and the Wi-Fi part of the antena to the KR1 router?

    I'm pretty hesitant to hack into this thing honnestly. Yes, I didn't pay for it with a 2 year contract, but a new one will be ~$200.

    the other concern is that I'm not wanting to LEAVE this thing in the car. I use it in my laptop a LOT.
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  9. #19
    cheap custom title JC-S60's Avatar
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    You could use some induction solution.

    Some carkits for GSM's have them.

    It's a passive system where you have an antenna outside, that's connected by some coax to some sort of antenna placed right next to (against) the antenna of the phone/datacard.

    This will overcome a bit of the faraday-cage effect a car has, but is not as good as a directly connected antenna.

    Good luck!

  10. #20
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    Perhaps I can find a way to hack into this card and put a quick connect on it.

    I'll see if I can find anything on that forum mentioned earlier.
    Jan Bennett
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