Monday, 9 June 2014

RFI forest

On Friday evening we had an unusual few hours of RFI. The emission was broad band and came as distinct spikes. Normally the RFI situation at KAIRA is pretty good, so this sort of thing came as a bit of a surprise.

Zooming in on the above forest, one can see that the spikes are not regularly spaced and are occurring every 1-2 minutes or so. The spikes are one-sample or less in duration (that is, less than 1 second, which is the sample period we use for these sorts of statistics files).

Looking at a plot to show different frequency information indicates that this is broad band. The following is a median-filtered plot. The noise in the 10-20 MHz range is shotwave radio.

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