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One of the options that is on the MatLab compiles program to create a spectrogram of a single data set. This option is only available when using a single data set and is a button on the menu bar on the right hand side.
We have seen different results when using this option. One thing we see often is a ribbon effect in the spectrogram. I have seen this before on spectrogram when using an aerial located outside caused by the wind. We are using a small transformer located inside.