I just put the rest of the low pass filter things that I did, which were on different parts of the site, all in the same LPF folder now. The original LPF simulations were from 4 years ago. Sadly, the EMRFD software is no longer (easily) available that I did the original plots in. The Tonne Software programs have become my "go to" for most things now.
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Paul KE7HR
Paul Jorgenson KE7HR