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Thread: Any way to use your car's antenna as a WiFi antenna?

  1. #21
    Constant Bitrate
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    Quote Originally Posted by KimaX
    I built one of these a year back and it really does increase the range of my Linksys AP. If you don't feel like building one yourself, you can buy one from here

  2. #22
    FLAC IntellaWorks's Avatar
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    here's a fun fact for everyone, Wifi is 2ghz. It has the same power (output as a microwave) And your not suppost to sit closer than 18" to the router or Wifi Card. My roomate is a safty major, and has a book of all these hardware regulations.

    there's one for cell phones too ! a cell phone has to be designed so that the antenna is 7cm away from the head at all times.

    Basically there are studies that prove these frequencies affect the human body in unknown ways...

  3. #23
    Variable Bitrate HybridMike's Avatar
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    here's a fun fact for everyone, Wifi is 2ghz. It has the same power (output as a microwave) And your not suppost to sit closer than 18" to the router or Wifi Card. My roomate is a safty major, and has a book of all these hardware regulations.

    there's one for cell phones too ! a cell phone has to be designed so that the antenna is 7cm away from the head at all times.

    Basically there are studies that prove these frequencies affect the human body in unknown ways

    Prolonged exposer can have negitive effects on the body, but the power output is far lower than that of a microwave oven, I think you mean the frequency is the same, the higher the frequency the tighter the wavelength gets...at aroung the ghz range it begins to affect moleculer motion, which causes the atoms to "vibrate" thus creating heat, that is how a microwave cooks, but the power output has to be high enough to do it...
    but cell phones, and wifi adapters/routers are low power microwave devices.

  4. #24
    Constant Bitrate
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    Quote Originally Posted by The Grinch
    Antenna's are made to specific lengths to match the radio frequencies that you are trying to receive or transmit on. FM radio is in the lower half of the MHz band, while WiFi is well into the GHz band. Then there's other stuff to consider like antenna resistance and impedance. If you tried to simply rig up a WiFi device to your car antenna, you would risk toasting it's transmitter. Even if you figured out how to safely hook it up, the antenna would give you very poor reception for the application.

    The only alternative you have is to replace your car antenna with one that is made for WiFi. You can buy them (they are quite short by the way), and you would have to fabricate a way of mounting it as the connectors are totally different.
    this is true.
    the wavelentgh of a 2.4GHZ signal is about 5 inches
    while 106mhz is around 9 feet.
    i learned about wavelengths in chem and all this made a lot of sense to me.

    the wifi antenna are engineered to transmit and recevie specific wavelentghs so using a car antenna would help but it would be very poor

  5. #25
    Clover Grayscale's Avatar
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    Quote Originally Posted by IntellaWorks
    here's a fun fact for everyone, .... ....
    Has anyone seen Eurotrip? Funniest movie EVAR.

    "Here's a fun fact, YOU MADE OUT WITH YOUR SISTER!"
    CarPC install is starting to come along again...

  6. #26
    Variable Bitrate no1knows's Avatar
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    Quote Originally Posted by IntellaWorks
    Basically there are studies that prove these frequencies affect the human body in unknown ways...
    hmmm... quite a bit wrong with that sentence
    Mods: 18" Boss rims,Twin custom stainless exhaust,cold air induction.
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    http://www.no1knows.com/galleries/

  7. #27
    Constant Bitrate StationRocket's Avatar
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    I'll chime in with a few things.

    Remember that nothing is free. Using an antenna with a 24dB gain will likley result in you having a signal less often than using one with a 3dB gain. This is because as the gain goes up the beam get's narrower. So the high gain antennas are great for applications where both sides of the link are static and you can very acuratly aim the antennas not so much for cars. The antanns refered to as omnidirrectional are more appropriat for our application. These antennas get thier gain by limiting the beam in azmuth vice in bearing. This means the beam is a big pancake vice a big sphere in the case of no antenna or a baseball bat in the case of a high gain dirrectional antenna.

    As was stated to work at a particulat frequency an antenna must be designed for that frequency. As frequency goes up this effect is more pronounced. This makes getting any advantage out of using your car antenna unlikly. I'm sorry for not going into why on this one but it's pretty drawn out and there is lots of good reading on this on at your library, and lots of bad incorrect stuff mixed in with the good out there on the web.

    2.4ghz is pretty easy to block so you really have to pay attention to what is in between you and the other antenna. Anything that has water or metal in it is gonna be a problem. So you definatly want to get your antenna on the roof.

    I have had lots of success using antennas and amplfyers from http://www.hyperlinktech.com No, i don't work for them.

    Sorry about the long post. I think i've done a couple of similar posts here before that may have some more info if you're interested.

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