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

  1. #31
    Maximum Bitrate kbyrd's Avatar
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    Since someone thought this was good advice, I'll follow it up with specific product recomendations:

    Senao/Engenius sells really great gear in a variety of forms: PCI, usb, ethernet bridge, PC Card, etc.

    In almost every form factor you can find a 200mW card with great recieve sensitivity. Plus, they have external antenna connectors (you buy a pigtail to adapt from the radio's tiny connector to an 'N' connector, then your antenna has an 'N' connector). These cards coupled with an good antenna (hyperlinktech.com) will get you really great range. You may still have problems with the tint. But this is a much better alternative to an amp.
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  2. #32
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    @kbyrd: thanks for the contribution

    Here is the spec sheet for the commel 2400 card:

    ftp://ftp.commell.com.tw/Public/Data...al/MP-2400.pdf

    Can someone smarter than me interpret this: "Output power: 12~14dBm (54Mbps), 18dBm (11Mbps)

    Does this mean that as is, the card provides from 12dB to 18dB of gain? That sounds pretty good to me, no? Is there any real need for another antenna for this card?

  3. #33
    Maximum Bitrate kbyrd's Avatar
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    Quote Originally Posted by Jackboot
    Can someone smarter than me interpret this: "Output power: 12~14dBm (54Mbps), 18dBm (11Mbps)

    Does this mean that as is, the card provides from 12dB to 18dB of gain? That sounds pretty good to me, no? Is there any real need for another antenna for this card?
    I'll interpret (check here: http://www.terabeam.com/support/calc...s-dbm.php#calc )

    12dBm = 15.8 milliwats
    18dBm = 63.1 milliwatts

    this isn't "gain" it's output power. Every 3dBm = double the output power. dBi is gain for an antenna. The Senao cards I mentioned are 200mW (23dBm). That sheet doesn't mention recieve sensitivity (few spec sheets do), but that's the other half of the "getting a good connection" equation. It doesn't matter if the other end (the AP) can hear you if you can't hear them.
    My worklog.
    Status: VM GTI sold, got out of the CarPC tinkering hobby, but I still think about getting back in.

  4. #34
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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.
    Well after some of the posts so far, this idea is looking better. I hadnt heard the negative side of using an amp untill this thread so.. Appreciate the input..

  5. #35
    Newbie agmsd's Avatar
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    I would like to apologies to SKiTLz.. for Hijacking his thread... It just poped to my mind.. hope that u accept my apology... thanks...

  6. #36
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    Quote Originally Posted by agmsd
    I would like to apologies to SKiTLz.. for Hijacking his thread... It just poped to my mind.. hope that u accept my apology... thanks...
    hey no problem mate.. hope you get the answers your looking for.

  7. #37
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    so is there any problem with using an amplifier with an antenna outside of the car?

  8. #38
    Maximum Bitrate kbyrd's Avatar
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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.
    I'll quote myself. I'm not saying amps are more dangerous than a high powered card and a high gain antenna. I'm saying there are VERY FEW (are there any?) circumstances you should ever use an amplifier with wifi. It generally causes more trouble than good. The cable runs are short enough for us (how big is your car?) that a good antenna and card is a better choice.

    Inside the car/outside the car, no amp. Spend the money on better wifi gear and a better antenna. If you're really paranoid about a long cable run (when I said "long" in the quote above, I mean >50 feet not six feet to your trunk), use high quality cable, LMR-200 (or LMR-400 or LMR-600, but that's got to be overkill for a car).

    Keep in mind that I used the gear I'm talking about to setup several 3-10 mile links. So, a 2 foot omni antenna and a 200mW card in your car should pick up nearly any access point you car about.

    200mW is a lot of power. Combine that with an 8dBi omni antenna and you're likely too find an access points everywhere.
    My worklog.
    Status: VM GTI sold, got out of the CarPC tinkering hobby, but I still think about getting back in.

  9. #39
    Variable Bitrate roadhog's Avatar
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    Sounds very much like you know what you're talking about. I imagine lots of people are interested in this so I vote you should condense this thread into a mini FAQ Kbyrd.

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