Just spotted on the Southgate site that K4SWL is creating a website to archive shortwave broadcast recordings before these disappear. Already many SW BC stations have closed at least parts of their services. The HF broadcast bands are nothing like they were even 20 years ago. See http://shortwavearchive.com/ .
My shortwave radio experience started over 50 years ago listening to SW broadcast stations on a simple crystal set in my bedroom. As much as I hated the propaganda from the communist broadcasters like Radio Moscow and Radio Sofia, Bulgaria, I do miss them and their evocative interval signals.
See also https://sites.google.com/site/g3xbmqrp3/hf/interval and take a nostalgic trip down memory lane.