I read an article in an engineering magazine, late '80's, wherein a ham walked us through the design of a Tayloe architecture rx using a PGA to do the repetitive motion of FFT to produce what was essentially a self contained SDR receiving way above the HF freq's. I recall that I was stunned by that, had no idea Tayloe existed at all and doing the FFT in a PGA seemed like pure genius. The author, a ham, just walked through the design like it was just another ho-hum day after hours in the lab...