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http://www.lazygranch.com/images/temp/7fsk.gif

When I just displayed the power spectrum, it looked like 8, but in the
spectrogram, it does look like 7.

Interesting. What program did you use to produced that spectrogram?
I use Digipan for live monitoring and Matlab for analysis.
I use gram sometimes too. It has some nice features but
also some peculiarities.

Does it let you adjust the FFT size.
A shorter FFT gives better time resolution at the
expense of frequency resolution.
A longer FFT gives better frequency resolution at
the expense of time resolution.
But you probably knew that already.

--
rb