More and more the Software Defined Radio is part of the Radio Amateur hobby. However it’s a part off the hobby, the understanding of SDR could be better.
In 2006 Pieter-Tjerk de Boer, PA3FWM, wrote in “Electron”, the clubmagazine of the VERON a series of enlightening articles about the phenomenon SDR.
Because the articles about the phenomenon SDR are stil from great interrest I scanned it and. Later you can find it here.