Minidiscs can be used in mono to get double the standard 74 minutes.(148)
I believe that the newer ones can record in MP3 format and get much longer
times than that. Although, a PC or laptop and appropriate software would
provide an almost limitless recording time.

Peter wrote:

What is the best device to get in order to be able to record from the
Shortwave radio? I am looking for something that would record quite a bit
longer than the 30 minutes offered from cassettes.

Thanks for your input

Pierre