understanding WIFI range

Discussion in 'Wireless Internet' started by d2walter, Sep 12, 2007.

  1. d2walter

    d2walter Guest

    I don't understand how boosting power in an access point can help
    range. From my understanding of antennas, if the access point is
    transmitting a 100 mW and my computer is transmitting at 100 mW, both
    transmissions will have the same range. If I double the transmission
    power of the access point, this will increase the range of information
    from the access point to my computer, but it does not effect the range
    in the other direction.

    This is my general problem when connecting to wireless networks. I
    get several bars of signal as they are transmitting quite powerfully,
    but my computer is not powerful and cannot transmit something they
    receive.

    Is there a way of using a router as a client to boost client
    transmission power?
     
    d2walter, Sep 12, 2007
    #1
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  2. d2walter

    dold Guest

    Some routers, some labeled travel routers, can be used as clients.
    You are right, boosting power may be of some help, but improved antennas
    are a better solution, effectively boosting power and receive sensitivity.

    Directional antennas are best, and need not be overly directional, covering
    a sector for desired coverage, at some loss of coverage in directions where
    it isn't needed anyway.

    I added a free reflector to the router. It provides improved coverage over
    a fairly broad area in the direction that I want. I have an L shaped
    house, with the router at the top of the L. Coverage with the EZ-12 is
    good throughout the house, even out to the bottom tip of the L, and on the
    deck inside the angle of the L.

    http://www.freeantennas.com EZ-12, printed on photo paper for thick stock,
    with aluminum foil glued to the sail, provides a substantial boost in
    signal. http://www.rahul.net/dold/clarence/EZ12-windsurfer.jpg
    http://www.rahul.net/dold/clarence/windsurfer-dining.JPG The netstumbler
    trace shows solid signal as I walked back to the router, a dropout as I
    blocked the router, taking off the reflector, and then the lower signal
    without the reflector, reduced, and fluctuating in level.

    Make the tabs longer than the template drawing, for easier assembly.
     
    dold, Sep 12, 2007
    #2
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  3. d2walter

    Bill Smith Guest

    For the most part, you are correct. If you change nothing but the output
    power of the AP, the connecting stations will still be limited by their
    output power.
    As a ham operator, I've found that the antenna is you best bet to improve
    performance in any king of tranceiver, be it a 2m radio or a wireless AP.
    Take that AP I mentioned above. If you add a directional (like the one you
    can make at freeantennas.com) antenna; This increases power by sending the
    majority of the signal in a 120-170 degree path (instead of 360 degrees)
    while also improving reception (gain) in that same arc.
    On my AP at the house, my laptop signal strength was at 60% and increased to
    80% when I added the reflector (directional) element. They aren't scientific
    measurements, but performance improved.

    You are correct though that if you put out 10watts thru the stock antenna
    (this would exceed the FCC legal limits by the way), the connecting station
    might hear you, but probably won't connect depending on its location.
    If you run a card with a true antenna on your connecting station, with
    correct placement it will also improve your connection to the AP. So if you
    point both antennas at each other, your range performance will increase even
    further. The better balanced your antenna is to the transmitter (SWR), the
    better your system will be. More power will make it to and thru the antenna.

    Did I confuse you enough? I tend to ramble on from time to time.
     
    Bill Smith, Sep 12, 2007
    #3
  4. By gosh, you have it correct. (To a point.) They not only increase the
    effective radiated power of the access point, but they also increase it's
    sensitivity. Making it more sensitive, gives the effect of making your
    remote unit more powerful as the access point is more able to see it.
     
    Richard Johnson, Sep 13, 2007
    #4
  5. d2walter

    DTC Guest

    If you increase the radiated power by using a higher gain antenna, then
    THAT way it will increase the received signal level.
     
    DTC, Nov 3, 2007
    #5
  6. d2walter

    blinker

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    re

    well i think, a better way is to refresh your connection. or should i say change things on your phone. better yet, ask your provider on it. but if you think it is fixed or what maybe, your phone has limited connections. It happened to my phone once, so I called up my provider and told her about the issue. good review is also found here wifibsd(dot)org. hope this helps coz it helped me too. :)
     
    blinker, Mar 24, 2011
    #6
  7. d2walter

    koolholio

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    amplification .... noise levels increase too, with attenuation there comes the noise!

    RTS = return to sender.... sender unknown? *sings*
    DTIM = indicator beacon

    Long range = slower
    performance = less range

    :) SIMPLES! *squeak*
     
    koolholio, Mar 26, 2011
    #7
  8. d2walter

    koolholio

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    also theres a few different specifications under the N spec, as there was with a,b and g frequencies
     
    koolholio, Mar 26, 2011
    #8
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