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Thread: 802.11b signature

  1. #1

    Default 802.11b signature

    I'm looking at some 802.11b signal. What is causing those two distinct "drops" at arround +-10Mhz?

  2. #2

    Default Will you send me a recording

    Will you send me a recording of this?* Thanks!

  3. #3

    Default http://rapidshare.com/files/


    http://rapidshare.com/files/251684414/802.11b.wsr.html




    [img_assist|nid=1529|title=spectrum|desc=|link=none |align=left|width=41|height=100]

  4. #4
    Join Date
    Apr 2009
    Location
    Tifton, GA
    Posts
    521

    Default The same thing happens with

    The same thing happens with 1 of my routers.

  5. #5

    Default sorry I meant +-5Mhz

    sorry I meant +-5Mhz

  6. #6

    Default My linksys runing open wrt

    My linksys runing open wrt does it as well. I dont think there is anything wrong, just they way that radio works.

  7. #7

    Default well I'm just curious about

    well I'm just curious about what in the standard make the suposedly round curve got carved, wave shaping maybe.

  8. #8
    Join Date
    Apr 2009
    Location
    Tifton, GA
    Posts
    521

    Default I'm curious too. The 2

    I'm curious too. The 2 linksys routers with DD-WRT I have don't do that, but the La Fonera with Openwrt I have does.

    It could be the Atheros chipset, The linksys have Broadcom chipsets.

  9. #9

    Default I'm not 100% clear on the

    I'm not 100% clear on the technical details, but the notches in the spectral signature are characteristic to 802.11b transmitters. It seems to be a pattern generated by the DSSS modulation scheme. I have seen several references on the Internet, where researchers use these notches to recognize 802.11b networks when attempting to identify interfering transmitters.

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