Spikes in noise floor

Submitted by tx-wifi on Wed, 07/30/2008 - 19:57.

Has anyone seen a similar spectrum where there are sharp spikes noise? Any idea what could cause this? The location of the AP is in a warehouse. The recording file is attached.

Thanks.

Noise-spikes.jpg.png
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Submitted by Trent on Thu, 07/31/2008 - 11:21.

The source of the noise is USB, since it uses a 24MHz clock and the
spurs are 12MHz apart. The views' amplitude range auto-scales based on
signal strength of transmitters present. In a typical environment with
wireless access points, mice, keyboards and the like transmitting
between -55 and -35 dBm, the USB noise is barely noticeable. In an
anechoic chamber with no transmitters present, the way the views
auto-scale does cause the spurs to be shown off to alarming affect.

If the USB spikes are an issue, a simple USB extension should do the trick!

From: FAQ I hope that helps a little!

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