Marco

At my QTH in Nort Italy CFH was about 15 dB over noise on Spectrogram
at 10 Hz resolution, around 0200z of March 3.
Is the frequency almost exactly 137.00 ?

Yes, CFH is exactly centered on 137.000 kHz.  The pseudo random noise
modulation has no carrier and there is nothing marking the center of the
occupied spectrum so it is necessary to look at the power spectrum and find
the middle which will always be 137.000 kHz.  CFH does on occasion send
other modulation methods, in the last three months I have heard a FAX
transmission on the frequency as well as at least one FSK session as well.

Larry
VA3LK