Скачать или смотреть Filter design using old Puff software (low/poor audio)

I discovered I don't have suitable toroid cores to wind a broadband 80-20m transformer for the antenna input to the NE602! So in the meantime while I await an Amazon order, here is some analysis of a 40m band pass filter (bpf). Audio is very poor and low in this one, as I don't have a good system for recording from my PC just yet. Using a very old Radio Shack mic and Power Point tool to record. Crank the volume!
The software used for the circuit analysis is called Puff, a very old DOS-based software program used at CalTech in the 1990s. I used it in grad school about 10 years ago now (time flies) as part of some graduate study I was doing in RF design. It was intended for use primarily in analyzing microstrip-based RF circuits at VHF and UHF frequencies. But you can put it in "Manhattan" mode and model lumped elements like capacitors and inductors, which I did here. It is actually very powerful and elegant to crank through many designs in quick succession without a lot of complicated computing overhead (menus and settings, etc). It is a nice learning tool. There are obviously better tools now but I do not know how to use them and this one does the trick.