Hi Michael, many thanks for the comment, glad you enjoyed the show and your probably correct that a bit of commentary might have been a good idea. There was a couple of reasons that I chose not to add any commentary first it made the podcast easier to make but the real reason was that I was trying to create a bit of mystery for people that had never heard the strange sounds you'd find when tuning around the amateur radio HF band which I thought might be the case for a large portion of the audience. 

When I was a young boy I remember listening to old second world war valved receivers that I occasionally had access to and was fascinated by the strange sounds and voices having no idea what I was listening to I thought initially giving no explanation would create more intrigue for those that had never heard HF before and if there interest was gripped then they could have a look for some show notes. I'll probably add some commentary next time if I do a similar show.

PS many thanks for deciphering the Morse code (CW), and yes that was some incredible set-up DF2BO had certainly beats my half wave dipole flung in the loft :)