dat2spec and dat2spec2 frequency step: I'm missing something

[guilherme.m...@gmail.com]

First of all, I apologize if my question is ridiculous, but I really can't understand it.

I am using wafo25's dat2spec and dat2spec2 to process a time series of 198000 points with a acquisition frequency of 100 Hz. The total duration of the record is 1980 s, so the frequency step, in hz, when using a window with all the 198000 points should be  5.0505e-04. I get however, a frequency step, in hz, of  9.5367e-05 hz, which seems to be impossible, since the record isn't long enough to allow that.

When i use the function dat2spec2, I use afterwards the function ttspec to convert from radian to hz.

Can someone please explain me what going on?

Thank you