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Hacking a EVDO card to add an external antenna?

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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

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

  • #2
    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.

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    • #3
      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!

      Comment


      • #4
        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.

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        • #5
          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!

          Comment


          • #6
            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.

            Comment


            • #7
              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!

              Comment


              • #8
                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.

                Comment


                • #9
                  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!

                  Comment


                  • #10
                    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.

                    Comment


                    • #11
                      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.
                      G945GLCF2 | 512MB RAM | 160GB HD | Holux GPS w/ Routis | XMPCR w/ TOSLINK mod | Audigy 2 NX | | Xenarc 700TSV |Opus 150W PSU.

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                      • #12
                        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
                        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!

                        Comment


                        • #13
                          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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                          • #14
                            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.

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                            • #15
                              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.
                              Failure is not an option....



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

                              Comment

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