Jim - N6MED
Found this link on the USCG Face Book group. Presentation that revisits HF comm and it's application which old timers and newbies find interesting as an HF communications refresher.
Rohde and Schwarz webinar: "The Rebirth of HF"
This webinar explains why the "lost art" of HF is not only still relevant, but has been making a comeback in recent years, particularly in the area of both local and global communications.
Jim / n6med