I didn't intend to do an FFT of an FFT, but that might have happened by accident.? A spectrum of a spectrum is a cepstrum, which has similar anagrammatic concepts such as quefrency.
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Best wishes John Woodgate OOO-Own Opinions Only
Rayleigh, Essex UK
I hear, and I forget. I see, and I remember. I do, and I understand. Xunzi (340 - 245 BC)
On 2023-07-02 20:31, Andy I wrote:
John wrote, "but I've never seen an .IMP file before."
So you probably never did an FFT of an FFT before.? I think that is the only time you get such a file.? LTspice's Help recommends doing that as a way to get uniform timesteps.? There might be other reasons to do it, but it's not the first thing I ever think
of doing.