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Thread: 2.4Ghz - 4 x Signatures Channels 2, 4, 8ish and 13-14

  1. #1

    Default 2.4Ghz - 4 x Signatures Channels 2, 4, 8ish and 13-14

    Hi all

    The attached capture from a suburban school shows a Wi-Spy/Chanalyzer capture of 2.4Ghz-2.5Ghz with all on-site APs turned off. We can see what are likely neighboring APs on channel 1, but we're intrigued what these 4 other signatures are likely to be? Performance tests on this band were pretty poor, so they're definitely having a major effect on our APs which use channels 1,6 and 11.

    The signature resembles that of either motion sensors or cordless phones? We noted a large number of hardwired smoke alarms on-site of several different types, but we weren't able to power down the site to assess if these are on-site or not. Their strength at approx -55db perhaps indicates they're offsite? The nearest building are approx 50-100m away.

    Many thanks

    Click image for larger version. 

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  2. #2


    Do you have a capture file you can post?
    Old Mod by the Sea

  3. #3


    Sorry, we didn't record a capture file. What additional information might this provide that could help? Any ideas on the type of device we might be looking for?

  4. #4


    A capture file can be replayed to view signal behavior over a period of time.
    -55 dBm is quite strong which suggests a signal source within your building.
    Old Mod by the Sea


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