Thanks for the reply, in the meantime I tried to do the same with Matlab and realized exactly what you said, that indeed to design a notch filter 3 coefficients could be enough. And also that the wc term is
wc = PI * f_cut / f_nyquist = 2*PI * f_cut / f_s
As soon as I get back to mathematica I will try that and eventually post again.
Thanks a lot for the reply, that pointed me to the right direction!
Best,
Guido