Some odd 2.4GHz interference

[rsaeks]

I did a capture in one of our buildings to try and find out why 2.4GHz performance was so horrible, even though I am getting high SNRs. Any thoughts on what this could be? The spikes start around Channel 4 and progress through Channel 14. (I'm in the US)

http://twitpic.com/zqniv

Based on their strength on -70dB and frequency, I'm thinking they are getting in the way in some areas where channeling is more in the range.

Any input would be great.

Thanks!

[Trent]

Hi and thank you for posting a picture of the interference. Is there any way you can post a recording for us as well?

We've seen a couple devices like these before, but we haven't had anyone actually identify what the source is! Multi channel semi FHSS device

Is it constantly there?

Can you get us a zoomed in view? (enable Wi-Fi labels). Right click on a channel and zoom in.

[rsaeks]

Is there a good place to upload the recording? I grabbed it overnight and the zip is 19MB. Here is a screenshot at the end of the time: http://twitpic.com/116m5g

I'm seeing a -70dB spike roughly every 2 MHz, with a signal ~10dB below the peak +/- 1 MHz from the spike.

Computers in the same large room have wireless and bluetooth turned off, so I am pretty confidant this isn't coming from those computers.

[rsaeks]

Is there a good place to upload the recording? I grabbed it overnight and the zip is 19MB. Here is a screenshot at the end of the time: http://twitpic.com/116m5g

I'm seeing a -70dB spike roughly every 2 MHz, with a signal ~10dB below the peak +/- 1 MHz from the spike.

Computers in the same large room have wireless and bluetooth turned off, so I am pretty confidant this isn't coming from those computers.

Along those lines, it looks like there is 600kHz above and below the peak. The spikes I see are roughly every 2MHz with a bandwidth of 1.2 MHz spanning 600kHz on either side of the peak.

[snake]

Hi there!
Do you have any FHSS devices around (like old Proxim APs or wireless cameras / anti-burglar system) or a "friend" with wideband noise generator? 1MHz is a standard signal width for FHSS system and I would look for these.

[Trent]

Is there a good place to upload the recording? I grabbed it overnight and the zip is 19MB. Here is a screenshot at the end of the time: http://twitpic.com/116m5g

I'm seeing a -70dB spike roughly every 2 MHz, with a signal ~10dB below the peak +/- 1 MHz from the spike.

Computers in the same large room have wireless and bluetooth turned off, so I am pretty confidant this isn't coming from those computers.

You can email it to support at this domain and I'll post it for you!