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Thread: Use of external antenna

  1. #1

    Use of external antenna

    Does anyone on this forum already has experience with the use of another external antenna on the wl-500g?
    According to http://home.wanadoo.nl/erwin.gijzen/wifiomni/ (in dutch) a homebuilt antenna can double the range of your access point.
    Another question: do the standard internal and external antennes of the wl-500g have the same function?

    regards,
    Theo.

  2. #2
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    The two antenna's are used in diversity mode, as described in the Internal Photo's topic. (Basically it's only one antenna at a time)

    Furthermore, I don't have experience with custom antenna's on the wl500g,
    but I do have some (negative) experience with the specific antenna you linked, on a pcmcia card.
    Building it comes very accurate.
    Also I had negative experiences with using a small (rusted) satellite dish,
    but positive effect with a pringles can, and a helix antenna. (directional)

    You might want to google for zx-yagi, a dutch online store, which had/has the same type of (wardrive) antenna's as delivered with the router (only bigger/higher gain)

    I wasn't educated in antenna building, so I can't give you many details, but to give you an accuracy idea: if you're only 1mm off the original size of a 1/4 lambda, then you are totally off the wifi band, and therefore you will miss extra gain.

    :edit:
    typo
    Last edited by xopr; 29-03-2005 at 19:49.

  3. #3
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    how much dBI we have the antenna of wl500g?

    With this antenna

    Antenna OmniDirectional 2.4Ghz Wireless com conector Reverse SMA with gain of 5.5dBI with 2 meters of cable.

    who many meters or % have more range?

    The Wl mabe not suport this antenna?
    Last edited by int; 27-04-2005 at 13:51.
    Home Page
    Marco Sousa from PORTUGAL
    [ WL-500g - fw: 1.9.2.7-7e [Oleg] | WL-500gP - fw: 1.9.2.7-7f-USB-1.63 [Oleg&koppel.cz] ]

  4. #4
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    I bought this antenna:

    Wireless LAN 2.4GHz antenna with 5.5dBi and magnetic base



    Wireless LAN 2.4GHz antenna with 5.5dBi and magnetic base

    Vertical Antenna for 2.4GHz with 5.5dBi of gain. Ideal for WIFI Networks and general ISM equipment.
    This antenna has a cable 2.0m long with an RP-SMA female connector.
    The magnetic support allows you to attach it to a metal surface.

    Characteristics:


    - Frequency: 2.4GHz
    - Gain: 5.5dBi
    - Type of antenna: omnidirectional
    - Polarization: vertical
    - Range: +/-20% increase on line of site devices

    Physical specifications:


    - Horizontal rotation: 180º
    - Vertical rotation: 90º
    - Connector: RPSMA Female
    - Cable length: 2m

    Contents:


    - Antenna
    - 2m coaxial cable
    - round plate + screw for wall mounting


    Friday I will do the tests
    Wait..
    Last edited by int; 27-04-2005 at 22:54.
    Home Page
    Marco Sousa from PORTUGAL
    [ WL-500g - fw: 1.9.2.7-7e [Oleg] | WL-500gP - fw: 1.9.2.7-7f-USB-1.63 [Oleg&koppel.cz] ]

  5. #5

    I have plugged an external 9 dbi antenna (US Robotics) to my 500dx.
    What shall I say ?
    The results I got from netstumbler were worse than before !
    I tried different positions with this antenna.
    If you'd asked me: be happy with your original one and if you want to get more range - try to use a range expander. But only if the problem with WDS and WPA-PSK is solved some day !


    Regards,
    Matthias

  6. #6
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    Quote Originally Posted by utratama

    I have plugged an external 9 dbi antenna (US Robotics) to my 500dx.
    Reverse SMA antenna?

    US Robotics 9dBi Directional?
    Home Page
    Marco Sousa from PORTUGAL
    [ WL-500g - fw: 1.9.2.7-7e [Oleg] | WL-500gP - fw: 1.9.2.7-7f-USB-1.63 [Oleg&koppel.cz] ]

  7. #7
    Which means: onmni-directional with reverse sma.
    And I am not happy with that.


    Wireless-LAN Richtantenne – 9 dBi Gewinn USR5482

    Frequenz:2,4 GHz802.11b / 802.11g•

    Impedanz:50 Ohm


    Radiationmni-directional


    Reverse SMA Stecker •für PCI Adapter und Gaming Adapter

    für Router, Access Point, PCI Adapter und Gaming Adapter

    Richtantenne Reichweite ca. 600 meter (freie sicht)

  8. #8
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    Specifications &
    Standards
    􀂃 Gain: 9dBi
    􀂃 Nominal Impedance: 50 Ohms
    􀂃 Frequency Range: 2.4-2.5 Ghz
    􀂃 VSWR: <1.5:1
    􀂃 Polarization
    􀂃 Vertical (60o) or horizontal (60o),
    linear
    􀂃 Left hand circular
    􀂃 Directional antenna
    􀂃 Outdoor rated
    􀂃 Wall or corner mountable
    􀂃 Reverse polarity SMA (female)
    connector
    Package Contents
    􀂃 9dBi Directional Antenna
    􀂃 Mounting kit
    􀂃 CD ROM
    􀂃 Installation Sheet (English only)
    􀂃 5 foot Cable

    this antenna?
    Last edited by int; 28-04-2005 at 14:54.
    Home Page
    Marco Sousa from PORTUGAL
    [ WL-500g - fw: 1.9.2.7-7e [Oleg] | WL-500gP - fw: 1.9.2.7-7f-USB-1.63 [Oleg&koppel.cz] ]

  9. #9
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    9dBi with a WL500g need a Amplifiers to amplifiers because the WL dont five that power(mW) that this antenna needs..
    Last edited by int; 28-04-2005 at 15:41.
    Home Page
    Marco Sousa from PORTUGAL
    [ WL-500g - fw: 1.9.2.7-7e [Oleg] | WL-500gP - fw: 1.9.2.7-7f-USB-1.63 [Oleg&koppel.cz] ]

  10. #10
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    wifi amplifiers are way too expensive to use.

    Also I don't think you need to use one
    To quote something out of an interesting wifi page from i-hacked.com :
    When using a high-gain omni antenna (8–12 dBi), the propagation angle is very flat and narrow. Placing the antenna too high will cause the main lobe to pass over the intended target antenna. The irony here is that height is required to clear obstructions, a.k.a. Line-of-Sight, from the Wireless Point of Presence (WiPoP) path to the receivers. Higher gain omni antennas have a flatter, “pancake” shape, while lower gain omni antennas tend to have a wider “donut” shaped pattern.

    It may be necessary to use a unidirectional antenna and “down tilt” that concentrates the energy (signal) in a more focused area. Unidirectional antennas direct energy in one direction by radiating the entire signal in a concentrated area instead of 360 degrees like an omni. Table 10.2 lists antenna types and associated values in dBi (gain). Figures 10.2 through 10.6 are images of these antenna types.

  11. #11

    Thumbs down

    Quote Originally Posted by int
    9dBi with a WL500g need a Amplifiers to amplifiers because the WL dont five that power(mW) that this antenna needs..
    Hey guys....
    If you aren't sure about something, then don't say it!...
    I sugest you read this page:
    http://en.wikipedia.org/wiki/Antenna_(electronics)

    now to get some things clear:
    The antenna gain is a measurement of the GAIN the antenna is able to deliver. It "sort of" acts like a magnifying glass... also, the higher the gain, then the narrower the beam. Think of it like spraying water with a hose...

    just for reference:
    for each +3dB you double the power
    for each +6dB you double your range (distance).

    for example, in an open field, if you receive a radio signal at 150m, but not at 300m, then if you change the antenna to another with an extra 6dB of gain, you will be able to get the same signal at 300m as you did at 150. (And at 150m you will get 4x as much power as before...)
    Last edited by Antiloop; 30-04-2005 at 16:30. Reason: fixed url
    [ WL-500G | fw: 1.9.2.7-7f ]

  12. #12
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    Wireless LAN 2.4GHz antenna with 5.5dBi and magnetic base

    he gave some increase to me, not very, but I will make the tests when to be able...
    Home Page
    Marco Sousa from PORTUGAL
    [ WL-500g - fw: 1.9.2.7-7e [Oleg] | WL-500gP - fw: 1.9.2.7-7f-USB-1.63 [Oleg&koppel.cz] ]

  13. #13
    i use dlink's 8db omni antena on my wl500g with great result.

    i'd tried few directional/panel antenna with larger db but seem not have good result.

    imho, when used indoor (with lots of obstruction) it's better using omni.
    aztech adsl router -> asus wl500g w/ 1.9.2.7-5a fw -> linksys wrt54g w/ dd-wrt & hyperwrt as WDS

    http://www.ngobrol.com

  14. Directional Antenna

    hi, i am using +8DBI directional antenna from AIRLINK101 with good coverage, from fry's store o outpost.com greetings lauro soto

  15. #15
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    With the Wireless LAN 2.4GHz antenna with 5.5dBi and magnetic base i can comunicate at 200meters in open field in the city. with a laptop with a pcmcia smc 2835w
    Home Page
    Marco Sousa from PORTUGAL
    [ WL-500g - fw: 1.9.2.7-7e [Oleg] | WL-500gP - fw: 1.9.2.7-7f-USB-1.63 [Oleg&koppel.cz] ]

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