Also well worth look at Robert Carver's material, ex HF guy: https://qoppac.blogspot.com/p/about-me.html https://qoppac.blogspot.com/p/about-me.html A google

Also well worth look at Robert Carver's material, ex HF guy: https://qoppac.blogspot.com/p/about-me.html https://qoppac.blogspot.com/p/about-me.html A google will turn up plenty of videos and interviews too.