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WRT54GS and BiQuaD

Discussion in 'Modding Forum' started by nobugme, Sep 11, 2006.

  1. nobugme

    nobugme Network Guru Registered

    Hello!

    I built a biquad antenna (followed the edgadgenet "howto") like this

    http://gallery.bcwireless.net/gallery/main.php?g2_view=core.DownloadItem&g2_itemId=6816

    So I constructed in a cd box but there are some serious problem with this or I did something wrong because when I connect the device to the WRT54GS then signal total lost. Of course I tried bot connectors and first I removed the antennas. As I read, the right connector (from front) is better because it's directly sold to the panel. I also modified the TX power up to 56 (def 28) but still nothing. Only thing what I'm not sure is the cabling because I used 50 ohm coax (for testing a 0,1m piece first).
    Anyone have experience with this?

    Thanks.

    John
     
  2. HennieM

    HennieM Network Guru Member

    No experience, but antennas are a science on their own. Maybe ask at seattlewireless or trevormarshall or there-abouts.

    One point (not sure about this at all): The way your biquad is oriented on the photo, you will get vertical polarization (I think). Did you try it rotated 90 degrees?
     
  3. crawdaddy

    crawdaddy Network Guru Member

    if you are using anything but 50ohm coax specifically designed for 2.4Ghz transmission, that's your problem. Early on in my wireless work, I bought a 8db outdoor omni and tried to make my cable to go from router to antenna with 50ohm thinnet cable. my signal actually dropped with the 8db onmi compared to the stock 2db omnis that came with the router. The attenuation was astronomical in the 2.4Ghz range. Once I switched to real wireless-grade coax, my signal went way up. Hope that helps
     
  4. dontbotherme

    dontbotherme Network Guru Member

    Well thanks it helps something. But not sure what I excpected, I don't see more wireless networks with this biquad and the signal quality not better so I feel kinda wasting the time :(

    This time I used a short cable from a bad access point, exactly what's inside in linksys and I put the antenna inside of the box.

    There are many wireless specific parameters in DD-WRT , any1 knows how should I modify them to get a better results with my new antenna?

    John
     
  5. firmwaredownload

    firmwaredownload Network Guru Registered

    Well this is wasting the time :/ Its not better than the original antenna.
     
  6. littlerichie29

    littlerichie29 Network Guru Member

    it sounds like you soldered the element incorrectly.

    it should look like this:

    Note the 2 ends of the element aren't touching
     

    Attached Files:

  7. tuskan

    tuskan Network Guru Member

  8. windsurfer

    windsurfer Network Guru Member

    The biquad does work quite well if you do it correctly. I used one to drive a satelite dish and was able to get about 20db of gain. Here is a link to a bunch of antenna testng which includes testing of the biquad in the middle of the page.

    http://windsurf.mediaforte.com/wifi/wifi_antenna.html

    Wilton
     
  9. tuskan

    tuskan Network Guru Member

    here's the pic of my link, working with hand made panel antenna

    [​IMG]

    distance is 3.2km
     
  10. HennieM

    HennieM Network Guru Member

    Tuskan, where do you get the nice prints that you can just stick on the PC board for the panel antenna?
     
  11. tuskan

    tuskan Network Guru Member

    its so easy.

    just go to any place, where people making that... shop window adwertising - all those stikers and so on.
    those people sure have CUTTING PLOTTER - so, just give them the file and ask 2 make several plots

    the file in ai format attached

    also cdr format if you cant open ai,
    but people, who working with that - sure they can
     

    Attached Files:

  12. HennieM

    HennieM Network Guru Member

    Thanks
     

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