Hi Bojan,
Thanks for the screen shot example of how elsie works. I might have to see if I can get it to work on Wine emulator.
One thing to keep in mind is that, because of the stray shunt capacitors at both sides of the inductor, the insertion loss of the BPF will be greater than predicted by your simulation. Also, for the same reason, the rolloff on the higher frequency side of the center freq will be steeper. That is both in simulation and in real life measurements.