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  1. #1

    Question Question about Wi-Spy DBx

    I use a Wi-Spy DBx(Frequency:5150 to 5850MHz) and
    I captured unknown signals out-of-band frequency range
    (around the 5100MHz range) by using Chanalyzer Lab.

    But in my environment, I don't put devices that give off
    signals around its frequency range.
    So I think it has bug.

    I attached the captured file of Chanalyser Lab and measured data.
    Please see attached file.

    I want an opinion about what the signals around the 5100MHz range are.
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  2. #2

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    In the USA the frequency range from 5.0 GHz to 5.15 GHz is allocated for aeronautical radio navigation use. Link
    Are you near an airport or FAA facility?
    Last edited by ua549; 05-08-2013 at 06:57 AM.
    Old Mod by the Sea

  3. #3

    Default

    There is no Airport and FAA facility around my environment.
    I tested it in Tokyo Japan and there was no noise source around here.
    So I guess that the Wi-Spy DBx or Chanalyzer Lab have a bug.

  4. #4

    Default

    In Japan aeronautical radio navigation as well as space based communications use the 5.0 GHz through 5.15 GHz spectrum.

    In Japan there are 4 channels allocated at 5035 MHz, 5040 MHz, 5045 MHz and 5055 MHz.

    The source of the signals may be far from your location.

    I seriously doubt that there is a reporting bug in Chanalyzer. If there was, I would see it too. I don't.
    Old Mod by the Sea

  5. #5

    Default

    For additional information,when I captured the frequency around the 5.3GHz range,
    I could also capture the frequency range from 5.0GHz to 5.15GHz.

    On the contrary,when I don't use the device,
    I don't capture the frequency range from 5.0GHz to 5.15GHz.

    And more when I used other spectrum analyzer in same environment,
    the signals from 5.0GHz to 5.15GHz weren't captured.

    So I want the reason why the signals give off around the 5.0GHz to 5.15GHz
    and an opinion whether Metageek can fix the bug if it has a bug.

  6. #6

    Default

    Our customer is far from satisfied with our response as of this moment

    and we need to explain for our customer the details about the possible cause.

    So I'd appreciate it if you give us the other possible cause about this problem.

    In addition, new firmware version(4.2.27) is available from on web.

    Is there a possibility that the latest firmware version can fix this problem?
    Last edited by sakaki; 06-23-2013 at 09:42 PM.

  7. Default

    Quote Originally Posted by sakaki View Post
    There is no Airport and FAA facility around my environment.
    I tested it in Tokyo Japan and there was no noise source around here.
    So I guess that the Wi-Spy DBx or Chanalyzer Lab have a bug.
    I thinks Chanalyzer Lab have a bug

  8. Default

    Quote Originally Posted by hoacotu195 View Post
    I thinks Chanalyzer Lab have a bug
    It's possible that this is a harmonic or a ghost, because it looks like the 5100 MHz signature is more active when the 5308 MHz signature is also active. In some rare cases, the Wi-Spy can show a "ghosting" effect in 5 GHz, but typically it's UNII-3 activity causing a ghost in UNII-2e, not UNII-1 activity causing ghosting down by 5100 MHz. Not only is the issue pretty rare... this would be a very unusual manifestation of that issue.

    The other thing to consider here is that the Wi-Spy DBx is being tuned outside of the normal operating frequencies. We tune it for 5.150-5.850, with 4900-5925 being an optional, untuned frequency range that only Chanalyzer Lab and Chanalyzer 5 + Lab Accessory allow you to tune to. Outside of the default frequencies, it should be reasonably accurate, but it isn't tuned specifically for that and is best suite for light-duty spectrum analysis work in those frequency ranges.

    I hope that helps! Let me know if you have any questions.

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