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Thread: WIMax recordings or images ?

  1. #1
    Join Date
    Mar 2010
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    Default WIMax recordings or images ?

    Hey Metageek (Trent, bret, or Rich),

    Are there any captures of Clearwire's WiMax or any 802.16d/e SA images/recordings in general? I know the old recordings archive had some, but that isn't accessible anymore..

    Please post some of the older recordings otherwise from in the 2.5 GHz range... (And yes, I know it isn't technically supported)..

    Thanks!

    Oxygen
    Last edited by oxygen69; 05-06-2011 at 06:25 PM.

  2. #2

    Default

    Wi-Max.wsx

    Here is one I dug up.

  3. #3
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    Miami, Florida
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    Default

    I'm not very familiar with WiMax. Which of these signals is WiMax? I see multiple; a strong one at 2510hz, and small bump at 2545hz, another strong signal at 2585hz followed by a smaller one at 2595hz.

    Is this one WiMax signal from 2510hz-2595hz? Or is this 2 separate channels?


  4. #4
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    Default

    You can see the 3 sides to the Wi-Max tower on here.. at 2501.6-2518.1 MHz (3x 5.5MHz channels).

    Example:
    Side 1) 2501.6 - 2507.1 MHz (5.5 MHz)
    Side 2) 2507.1 - 2512.6 MHz (5.5 MHz)
    Side 3) 2512.6 - 2518.1 MHz (5.5 MHz) - this side is pointing toward the Wi-Spy recording antenna.


    Another antenna pointing toward the Wi-Spy: (same tower probably)
    2583.8 - 2589.3 MHz (5.5 MHz)

    Also see it at:
    1) 2545.6 - 2551.1 MHz
    2) 2551.1 - 2556.6 MHz

    (most likely is that the 2583.8, 2545.6, & 2551.1 MHz signals are on the same tower- pointing in 3 different directions respective to the first 3 signals listed at the top of this message.

    Click image for larger version. 

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    Oxygen
    Last edited by oxygen69; 06-11-2011 at 04:20 PM.

  5. #5
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    Default

    So if I were to create a signature, I would use this whole range? Would all WiMax signals look the same anyway?

  6. #6
    Join Date
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    Default Stay away from signature in this case...

    What do you mean by the "Whole range" ?? a wimax signal is 5.5 MHz (nowadays), previously (6.0 MHz - under the old band plan). I believe the signature you would want would be the range of about 5.6-5.8 MHz wide to make sure you got the whole signal as a signature. You don't want all 3x 5.5 MHz signals in a signature, because they are not always right next to each other on the band.

    Overall, using a Signature in this case, and not just knowing the frequency and wimax characteristics (width) is not a good idea because I doubt that the WiMax will show up much on the signature unless you are with: a strong signal, near the tower, and have the signature programmed just right.

    While Metageek does provide the signature tool as a feature, they themselves have said that you should NEVER depend on it. In one of the older threads or blog posts Trent said that it is best to learn to identify signals as "device recognition" will never be perfect.

    Here is a signal from TDS (2605) - the high spike is quite obvious, but what is not so obvious is the middle wimax signals in the image. Those are of Clearwire (2630 & 2635 MHz roughly).
    Click image for larger version. 

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    Here is a larger sweep of from the frequency of 2500-2700 MHz using the WiSpy 2.4x2 (with included 1.5dB antenna).. Again you see the 2605 spike, but the 2630 & 2635 are harder to see.
    Click image for larger version. 

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    This is a recording of the same tower as above, but closer to it...Here you can now see that the middle WiMax signature is very evident. Not so much in the upper one.
    Click image for larger version. 

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    This is what a WiMax signal looks like (for the most part, up close with OFDMA):
    Click image for larger version. 

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    As you can see, using a device recognition may work for the 1 good signal in the first picture, but will totally miss the other signals that are actually there. Hence try not to use the signatures for these more (un-orthodox / rare) signals as you will miss them.. Learn to read the recordings!

    Oxygen

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