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Thread: WiFi Antenna w/ 1W amp through Tint.

  1. #21
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    Quote Originally Posted by agmsd
    Guys... I'm a noobie over here... I'm in the stage of planing my CarPC.. any ideas if there is an antenna that can be used in WiFi, TV... etc... I prefer using one or two antennas... I don't want my car to look like a broadcast station...
    Unfortunately physics don't allow one antenna to function for mutiple uses. You'll have to do a lot more searching on this (separate) topic to get a good answer. Good luck
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  2. #22
    cheap custom title JC-S60's Avatar
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    Quote Originally Posted by Gunmaster
    Ever touch a antenna while its transmitting RF? Try it and see how safe it is having it inside a car. Your worried about you car looking ugly. That would be the last thing on my mind. It's up to you. I would hate to see you or your passengers get a burn from you inside antenna idea.

    There are thousands of external 2.4 ghz antenna's on the internet. I would think one of them wouldnt be ugly.

    It does me. Thanks for posting that!
    Mouhahaha

    There's absolutely no problem involved at those low Wattages. Just try to heat up an antenna with a couple of mW. Have YOU touched an antenna while it was transmitting RF? If so, what did you feel, what devices were involved?

    And didn't you notice the metal in the "glass" door of a microwave-oven? Do "cage" and "faraday" ring a bell?

    I hate it when people act all like "oh, you're stupid for didn't knowing THAT" while talking out of their asses themselves.

    /rant

  3. #23
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    Jackboot. I've got a punch of PDF's Commell sent me reguarding the MP-2400 features and tech design etc if you want them. I was just trying to find out what connector they used so I could use an AMP and they sent me the bloody blueprints.

  4. #24
    What can I say? I like serial. Curiosity's Avatar
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    Well, really I would think that 2.4GHz at 1 watt would cook your finger while touching it. Just the first thing I saw on google...
    http://www.gallawa.com/microtech/Ch3.html
    Soviet studies show that long-term exposure to low levels of microwave energy could result in unpleasant effects that are not attributable to over-heating (or thermal effect) alone. These effects could be seen at exposure levels at and below 10mw/cm2, which is the occupational safety standard in the U.S.
    Of course an antenna wouldn't be focused like a magnatron and would disperse at the same factors as stated on that page since there's no metal to bounce off of. But anyway, would you still feel safe with 1W at say 10 inches from you every day?

  5. #25
    cheap custom title JC-S60's Avatar
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    Quote Originally Posted by Curiosity
    Well, really I would think that 2.4GHz at 1 watt would cook your finger while touching it. Just the first thing I saw on google...
    http://www.gallawa.com/microtech/Ch3.html

    Of course an antenna wouldn't be focused like a magnatron and would disperse at the same factors as stated on that page since there's no metal to bounce off of. But anyway, would you still feel safe with 1W at say 10 inches from you every day?
    Ok, I admit that I forgot about the 1 watt amp.

    But without, I really don't see the problem. 2.4 Ghz @ 100 mW versus 1900 Mhz @ 1W for a mobile which you keep next to your head a lot of the time.

    Oh, and an antenna would need to be very badly placed to have such bad SWR it would heat up.

    Sorry for the harsh reaction but I was a bit irritated about the way Gunmaster put his words.

  6. #26
    FLAC evandude's Avatar
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    Quote Originally Posted by JC-S60
    But without, I really don't see the problem. 2.4 Ghz @ 100 mW versus 1900 Mhz @ 1W for a mobile which you keep next to your head a lot of the time.
    the problem is that 2.4GHz is a frequency heavily attenuated by water... that's how microwaves cook things, the water in food absorbs a lot of the energy and gets heated up.

    the average microwave is hundreds of watts, if not thousands, and the amount of heating from 1W would probably be very minimal... call me paranoid, but I still wouldn't want to sit in a car with it when it was running at 1W... would I truly fear for my safety? no...

    now why did they choose 2.4GHz for wireless networking? I have no idea.
    But don't take it from me! here's a quote from a real, live newbie:
    Quote Originally Posted by Viscouse
    I am learning buttloads just by searching on this forum. I've learned 2 big things so far: 1-it's been done before, and 2-if it hasn't, there is a way to do it.
    eegeek.net

  7. #27
    What can I say? I like serial. Curiosity's Avatar
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    From what I understand, the wavelength at 1900MHz isn't small enough to penetrate a live cell and cause damage, and that's why it would be useless in a microwave oven and safe for cellphones. I'm thinking that a good reason to use 2400 for everything is that the FCC made it for public use since it's so noisy anyway. I think I'd feel safe at 1ft from 100mW. That wouldn't bother me at all.

  8. #28
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    Quote Originally Posted by JC-S60
    Sorry for the harsh reaction but I was a bit irritated about the way Gunmaster put his words.
    I think he means well.

    Antennas are built for a reason they belong outside.

  9. #29
    Maximum Bitrate kbyrd's Avatar
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    Do you have to use an amp?

    Wifi amps are bad, mmkay?
    The introduce noise and amplify noise as well as signal. I would really only consider using an amp in a wifi setup if I had a long antenna lead run from the antenna to the radio. In that case, the amp would go at the antenna end.

    If your case, I would just user a higher gain antenna and a higher powerer/more sensitive radio.
    My worklog.
    Status: VM GTI sold, got out of the CarPC tinkering hobby, but I still think about getting back in.

  10. #30
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    Quote Originally Posted by kbyrd
    Do you have to use an amp?

    Wifi amps are bad, mmkay?
    The introduce noise and amplify noise as well as signal. I would really only consider using an amp in a wifi setup if I had a long antenna lead run from the antenna to the radio. In that case, the amp would go at the antenna end.

    If your case, I would just user a higher gain antenna and a higher powerer/more sensitive radio.
    This is probably the best advice so far...

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