Yeah…remember hearing the term and reading about op amp ckt that simulated an inductor in a hobby electronics mag…some loonngg while back.
This may have been it:
Might be interesting to build an adj multi band audio filter/equalizer using this.
Looks more like a AR SIG thing…
Not really. It is a radio telescope for observing the sun. This is a science thing. It is a cool electronics circuit, which is an Electronics thing. No Amateur Radio License needed to operate, so not really an AR SIG thing.