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Wireless Networks Thread, Massive interference on Channel 6 in Technical; Just had a Meru network installed and initially there were big problems when all 32 netbooks tried to logon at ...
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    Massive interference on Channel 6

    Just had a Meru network installed and initially there were big problems when all 32 netbooks tried to logon at once. It was discovered that there is a HUGE spike of interference on channel 6 which makes it not useable.
    We have moved down to a different channel and all is well.
    BUT can anyone suggest what might be causing it? We have no systems that put out any sort of wireless signal.
    I would really like to know!

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    pshuttle's Avatar
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    Could be anything, even interference from a dodgy power supply. I used to work for a Telco and we were once contacted by OFCOM because some BBC customers had been complaining of very poor reception in the local area around a telephone exchange. It turned out to be one of our 12volt plug-in power supplies to an SDSL modem! Neither us nor the OFCOM guy could believe it, but sure enough unplugging it caused the spike in interference to disappear completely.

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    witch's Avatar
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    Really? It is across the whole site though.Is there any way of finding out?

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    We had the same problem ... channel 6 was unusable in one area of the school so switched to another and all was well ... I still dont know what was the source even trying in the evening when most of the school was shut down .....

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    Some alarm systems can create problems

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    witch's Avatar
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    I did wonder about the alarm - but why would it be putting out wireless signals? THE PIRs certainly don't. Interesting that BRpilot99, who works in a school with the same LA I believe, had the same problem - so maybe it is something like the alarm or the heating regulation system or something - I would love to know

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    You may be able to find out using a WiSpy Spectrum Analyser

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    witch's Avatar
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    Quote Originally Posted by chilbs View Post
    You may be able to find out using a WiSpy Spectrum Analyser
    How would that tell me what was causing the interference?

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    Motion sensors (well certain models) can also emit on channel 6 we had to swap wireless to another channel fixed the problem for us. We bought a WiSpy Spectrum Analyser and put something in front of the sensors and the interference seemed to be a lot less.

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    witch's Avatar
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    Quote Originally Posted by andy_nic View Post
    Motion sensors (well certain models) can also emit on channel 6 we had to swap wireless to another channel fixed the problem for us. We bought a WiSpy Spectrum Analyser and put something in front of the sensors and the interference seemed to be a lot less.
    Maybe that is it then, thanks

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    Another vote for the motion detectors, i've seen this issue at a number of sites. They put out a constant signal between channels 8 and 9 which interfers with both channels 6 and 11. Only way to check for sure is a spectrum analyser like metageeks wispy.

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    I have been told that we don't have motion sensors - so maybe that isn't it??

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    Thats interesting as currently having similar problems and channel 6 is being used. Got them in on Monday with an anyliser so will mention that to them. Ours is a Ruckus network, can we stop it using channels 6-8? We have a door system that uses wireless as well as an alarm system so could be that.



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