Hi Rune,
I just tested a SFZ450F ceramic filter. First I had set a span of 50kHz and I set 3 markers. Than I changed to 50kHz span and all the markers were gone. If you try to set a new marker in the S21 window the data of the marker appears but you won't see the marker in any of the plots.
Very strange.
Kind regards
Norbert, DG1KPN
