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Thread: Extending Antenna

  1. #11
    Variable Bitrate jschrauwen's Avatar
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    Quote Originally Posted by jcdillin View Post
    if your going with an external antenna don't worry about connection the 2nd antenna. I have only one on mine and it works great.
    I'd prefer not to have to drill any holes through the car body. I'm looking at perhaps the cable running up the A-Pillar(s) and locating some sort of an antenna near/by the sun visor / windshield but unobstructed by the roof. Would I increase my reception potential by having 2 interior antennas (on either side of windshield) or using a by-pole type antenna (if there is such a beast)?
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  2. #12
    Maximum Bitrate BarryWoods's Avatar
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    Quote Originally Posted by jschrauwen View Post
    I'd prefer not to have to drill any holes through the car body. I'm looking at perhaps the cable running up the A-Pillar(s) and locating some sort of an antenna near/by the sun visor / windshield but unobstructed by the roof. Would I increase my reception potential by having 2 interior antennas (on either side of windshield) or using a by-pole type antenna (if there is such a beast)?
    No, it would make it worse. One will do, where you want to put it should work as well. I'm saying should, because the radiating pattern of the antenna will be effected by the pillar, and it's not going to be oriented correctly. Antenna's should be polarized the same for the best connection. Most home access points use vertical polarization. This means that the antenna is straight up and down. Yours will have some tilt to it because of the windshield. This will cut down on the signal, but if you are in your driveway you shouldn't have problems.
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  3. #13
    Variable Bitrate jschrauwen's Avatar
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    Quote Originally Posted by BarryWoods View Post
    No, it would make it worse. One will do, where you want to put it should work as well. I'm saying should, because the radiating pattern of the antenna will be effected by the pillar, and it's not going to be oriented correctly. Antenna's should be polarized the same for the best connection. Most home access points use vertical polarization. This means that the antenna is straight up and down. Yours will have some tilt to it because of the windshield. This will cut down on the signal, but if you are in your driveway you shouldn't have problems.
    Thank you Barry! That's good to know and also a little less expensive from my previous thinking. I can understand the polarization part a bit from my radar theory many moons ago (horizontal, vertical, circular, polarized beam patterns and the like). Then it's probably best to route the cable (length providing) under the headliner to mid windshield where it will emerge and be attached to an appropriate antenna. When parked, I can let the antenna hang downward for best reception. There's an opportunity to be "connected" while on the fly in parts of Ontario. Toronto is the first to provide an open source for a majority of the downtown area. This means that one can be connected to a free open source which I found quite interesting and was only announced a few months ago. I digress, back to the situation at hand.
    I don't live near any major centers at present so shopping for the antenna and cabling will be a bit difficult. Ebay may be an option but I'll have to know exactly what I'm "shopping" for. I'd like to do this right the first time, so I guess what I'm really asking is, if cost wasn't a big issue and this were your project and you were looking for quality components with exceptional performance, what parts would you recommend I search/look for?
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  4. #14
    Maximum Bitrate BarryWoods's Avatar
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    No one up here carries this kind of wifi stuff. I usually get all my stuff from www.fab-corp.com . They're based out of Florida. You'll need the pigtail to go from u-fl to whatever, then a jumper with whatever the pigtail has to whatever the antenna you get has. They can custom build cables as well, so if you know how long it is from where your carputer will be to the headliner they can make one that long. Just take into account that most coax cable has a minimum bend radius. No sharp 90's! Most of the cable I deal with is LMR-400, it's about a half inch thick with a bend radius of about 8 inches. For your setup I wouldn't go with anything smaller than LMR-195. I'm not too sure what the bend radius is for that though. Shoot them an e-mail, tell them what you are wanting to do, they'll know the best parts to use waaaay better than I do.
    Failure is not an option....



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  5. #15
    Variable Bitrate jschrauwen's Avatar
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    Reviving my old thread

    Since my laptop is toast, I'm going to be bringing my CarPC with me to Afghanistan in July. (it 's never been installed in the car yet anyway)
    Since there apparently is going to be wireless internet availability there I'd like to get going on my antenna purchase and testing before I go. Although this set-up will be used in my room in camp I''ll be looking to continue using this antenna afterwards when the PC is installed in my Z.
    I'm considering this antenna;
    http://www.hyperlinktech.com/web/hg2407mgu.php

    It only come in N-Female connector or RP-SMA connector. I'm assuming I should be going for the latter - RP-SMA because of the U.FL pigtail I wish to use.
    I like to go with this U.FL pigtail cable to my card;

    I need to know which U.FL pigtail to select. Do I go with the SMA-Female Bulkhead jack;

    or the RP-SMA Bulkhead jack;

    I'm hoping to order these items up within the next few days so that I'll have time to install and test before packing everything up for my deployment for 6 months. I'd prefer to order everything from the same place for shipping and conveniance sake. My appologies if this appears to be a dumb question. cheers,
    John
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  6. #16
    FLAC
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    For an antenna, isnt the length important? I remember I designed an fm transmitter before, and the site mentioned that for the transmitter to work best, the antenna had to be of a specific length. The length was calculated based on the frequency that would be used.

    http://k4far.home.att.net/calc.html
    http://www.qsl.net/kd4sai/antencal.html

  7. #17
    Variable Bitrate jschrauwen's Avatar
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    Have you read all of the previous posts?

    Look at post #8.
    As long as it's for the frequency required. In this case 2.4GHz. There can be all sorts of sizes and shapes.
    I'm interested mostly in the correct connectivity and the proper selection of a 2.4GHz antenna with it's specific connector termination that will marry up with a corresponding U.FL pigtail bulkhead cable to the card.
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  8. #18
    Maximum Bitrate BarryWoods's Avatar
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    You'll want rp-sma. It's the one with the pin in the center and not the port for the pin. That antenna is going to need some type of metal ground plane to work correctly. They are made to use the roof of your car as one. Here's a pretty good site for wifi antenna info.

    http://wireless.gumph.org/

    I made it as far as Oman, try to stay in the shade as much as you can, it's freaking hot over there...
    Failure is not an option....



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

  9. #19
    Variable Bitrate jschrauwen's Avatar
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    Thanks for that Barry

    Quote Originally Posted by BarryWoods View Post
    You'll want rp-sma. It's the one with the pin in the center and not the port for the pin. That antenna is going to need some type of metal ground plane to work correctly. They are made to use the roof of your car as one. Here's a pretty good site for wifi antenna info.
    http://wireless.gumph.org/
    I thought the RP-SMA was the correct match.
    Thanks for the link as well. I think you posted that one before somewhere else . OK, Perhaps a re-thinking of this. Is it 100% the norm that all magnetic bases require that metal plane source as part of it's frequency matching properties to get good reception. I saw a number of interior antennas that also have a magnetic base, so does this still apply? Maybe it's best to state my intentions and then yourself or someone could enlightnen me as to viable antenna options.
    I'm hoping to have the antenna predominantly inside the car at all times. Perhaps in the rear hatch/deck. That said, I'll still leave myself the option (if required) to move the interior location of the antenna to the exterior (while parked). I'm not that concerned about having reception on the fly, rather when parked somewhere.
    There are these type;
    http://www.hyperlinktech.com/web/hg2403cu.php
    An interior (ceiling mount) omni-directional antenna that I could have sitting in the rear hatch or deck and then set out on top of hatch or roof when stationary.


    OR;
    http://www.hyperlinktech.com/web/hg2408p.php


    OR;
    http://www.hyperlinktech.com/web/re05u.php
    This one is meant for interior or exterior use. It's not too obtrusive and is only 6" high which means it could easily be plunked in the rear hatch/deck or even slipped outside and mounted to the outside of the rear hatch (if needed). The only short-coming to this antenna is that it only comes with a 4' length of cable. I would need to either request the vender to extend the cable length to about 10' (normal lengths as seen in other antennas) or introduce an intermediate cable to give me the dsired length.

    As you can see, I'm not going to get fussy with cost as most antennas seem to be around $30 or less. Cheapest is not the deciding factor here, rather, quality, efficienccy and effectiveness is the goal.
    I hope this helps for those trying to discern what I'm looking for.








    Quote Originally Posted by BarryWoods View Post
    I made it as far as Oman, try to stay in the shade as much as you can, it's freaking hot over there...
    Thanks Barry . My 6 months will be in Kandahar working in flight operations. Should be OK if the AC works . Your not an AWACS guy or scope-dope are you?
    http://gickr.com/results4/anim_5055e...a2b3b197c9.gif
    1990 RHD JDM 300ZX TT 2+2 5sp T-Top
    491RWHP / 18psi / 94 octane

  10. #20
    Maximum Bitrate BarryWoods's Avatar
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    Quote Originally Posted by jschrauwen View Post
    I thought the RP-SMA was the correct match.
    Thanks for the link as well. I think you posted that one before somewhere else . OK, Perhaps a re-thinking of this. Is it 100% the norm that all magnetic bases require that metal plane source as part of it's frequency matching properties to get good reception. I saw a number of interior antennas that also have a magnetic base, so does this still apply? Maybe it's best to state my intentions and then yourself or someone could enlightnen me as to viable antenna options.
    I'm hoping to have the antenna predominantly inside the car at all times. Perhaps in the rear hatch/deck. That said, I'll still leave myself the option (if required) to move the interior location of the antenna to the exterior (while parked). I'm not that concerned about having reception on the fly, rather when parked somewhere.
    There are these type;
    http://www.hyperlinktech.com/web/hg2403cu.php
    An interior (ceiling mount) omni-directional antenna that I could have sitting in the rear hatch or deck and then set out on top of hatch or roof when stationary.


    OR;
    http://www.hyperlinktech.com/web/hg2408p.php


    OR;
    http://www.hyperlinktech.com/web/re05u.php
    This one is meant for interior or exterior use. It's not too obtrusive and is only 6" high which means it could easily be plunked in the rear hatch/deck or even slipped outside and mounted to the outside of the rear hatch (if needed). The only short-coming to this antenna is that it only comes with a 4' length of cable. I would need to either request the vender to extend the cable length to about 10' (normal lengths as seen in other antennas) or introduce an intermediate cable to give me the dsired length.

    As you can see, I'm not going to get fussy with cost as most antennas seem to be around $30 or less. Cheapest is not the deciding factor here, rather, quality, efficienccy and effectiveness is the goal.
    I hope this helps for those trying to discern what I'm looking for.








    Thanks Barry . My 6 months will be in Kandahar working in flight operations. Should be OK if the AC works . Your not an AWACS guy or scope-dope are you?

    Naa, I was a KC-135R crew chief. I've actually had pretty good luck with one of those blade style antennas. I had it velcrowed to my powerbook display. The ceiling mount antennas have the pigtail coming straight out of the bottom, would be kinda hard to sit on anything without drilling holes. If it was me, I'd just pick up a 6 or 8 dbi rubber duck for the trip and get a mag mount once I got back.
    Failure is not an option....



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

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