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Thread: Trying to get started...how to identify this stuff?

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  1. #1

    Default Trying to get started...how to identify this stuff?

    I just got my Wi-Spy 2.4i in the mail today, I'm trying to get started on better troubleshooting of my random wifi issues with Chanalyzer Lite. Can someone take a look at these screenshots and let me know what you think? Are there posts somewhere I can look at to see known stuff to learn?

    I turned off my wireless routers while taking the measurements so I don't think it's traffic on MY network but I can't speak for the many, many other networks nearby.

    Here's one room -- notice the seeming random blips here and there
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    And another room on the other end of the house -- same kind of random blips
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    I went into the same room as my TV video sender (RadioShack, on "Channel D" to get as hich and far away from wifi channels as I can)
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    I tried boiling some water in the microwave, that seems too broad
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    I tried turning on/off some of our 5.8GHz Uniden cordless phones and they didn't appear to change the graphs at all.

    [EDIT: Also, is there a Linux (Ubuntu 10.04) version of Chanalyzer so I can complete my netbook "swiss army knife" of computer tools?
    Last edited by mmiller7; 06-11-2011 at 07:17 PM.

  2. #2

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    bump...anybody?

  3. #3

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    Hello,

    I took a look at the screen shots and the TV video sender would interfere with anything running on Channel 11 so I would make sure you AP is on Channel 1. The Microwave will effect all channels in the area of the Microwave. Can you provide more information on the trouble you are having? You might want to upload a recording here or send it to support@metageek.net.

    Your cordless phones run on the 5 GHz frequency band so the 2.4i will not see them as it only analyzes the 2.4 Ghz band.

    We do not have a Chanalyzer version for Linux.

  4. #4

    Default

    Quote Originally Posted by Richp01 View Post
    Hello,

    I took a look at the screen shots and the TV video sender would interfere with anything running on Channel 11 so I would make sure you AP is on Channel 1. The Microwave will effect all channels in the area of the Microwave. Can you provide more information on the trouble you are having? You might want to upload a recording here or send it to support@metageek.net.
    Can the 2.4i make "recordings" that I can upload? I was under the impression I needed the much more expensive one to do that?

    The problem I've been having is everything works but then I randomly have really low signal strength, or everything disconnects. Sometimes the network speed on b/g cards will drop to <1Mbps for a while without any apparent reason.

    I'd been running on channels 1 & 6 (now 1 & 7 because I saw a wierd spike falling at the low end of CH6 when I was near my video sender) but for the survey I unplugged my wireless devices. I have two APs -- one on a second story and one in a basement.

    I saw some random activity on the WiSpy that I was speculating might be responsable but I don't know what it could be. You can see the yellow spike randomly in a couple of the screenshots I posted already.
    Your cordless phones run on the 5 GHz frequency band so the 2.4i will not see them as it only analyzes the 2.4 Ghz band.
    That's what I would have thought but Google told me some 5GHz phones still used 2.4GHz for some stuff. I was just trying to rule them out.

    We do not have a Chanalyzer version for Linux.
    Fair enough, just checking.

  5. #5

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    Like Rich said, we don't have a Chanalyzer for Linux, but you can download Spectools by Kismet. That's what I'm using on my netbook running Peppermint (Ubuntu 10.04). You can find it in Synaptic by searching for "spectools" or on Kismet's website: http://www.kismetwireless.net/spectools/

    It's not quite as pretty as Chanalyzer Lite, but it has the basic views.

    Looking at the waterfall views in your screenshots, it doesn't appear that there's enough activity around to be causing interference serious enough to disconnect you (except, of course, for the microwave and video sender). You might try running Chanalyzer constantly until you get disconnected and then send a screenshot of that moment. It might be intermittent interference that wasn't present when you took these screenshots.
    Last edited by bret; 06-15-2011 at 10:34 AM. Reason: There's no such Linux distro as "Pepperming"

  6. #6

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    Sorry you are correct about the recording in Chanalyzer Lite. That is what I get for posting with a head cold and having medicine head. :-) I wonder if when you are seeing this drop in performance if one of the other AP's are doing an upload. Are the screen shots from when the problem occurs?

  7. #7

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    Sorry for the long delay, things were working great for a while. A few minutes ago I was having pages time out and thought it was my internet connection (Vz FiOS) but tracked it to wireless.

    I only got one screenshot before the interference went away and that was hard to grab because I haven't figured out how to work Chanalyzer completely.

    I also included speed-tests for wireless and wired from speedtest.net during the problem.

    Wireless:
    Wired:

    Wi-Spy screenshot: Click image for larger version. 

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    Any ideas? I have no idea what changed, I've been sitting at my desk and I'm the only one at home so I'm fairly sure nobody nearby is using phones/microwaves/etc to interfere.

    Wireless card: Intel Centrino Advanced-N 6200AGN
    Connected to channel 1, speed 144Mbps, signal "Good"
    AP: Linksys E3000 firmware 1.0.04

    Trouble only happens in 2.4GHz (to try and debug this, I set my AGN card to 2.4GHz-only mode) and I confirmed the same poor performance at the same time with my Linux netbook (Asus 1005HA Athros BGN wireless). Now the problems seem to have all gone away as quickly as they came.

    Any new suggestions?

    P.S. if there's any way to upgrade from Chanalyzer Lite to normal Chanalyzer that can record for a reasonable price, I might be interested. But I definately couldn't and still can't justfy the price of the next model of WiSpy just for the software.
    Last edited by mmiller7; 06-21-2011 at 12:19 PM.

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