As promised here are my slides of the talk I gave in March 2023 at my local radio club, Bangor and District Amateur Radio society.
https://drive.google.com/file/d/1_x4UXUfXlPMBHFsL1ALTU4x_uHnfXsJs/view?usp=share_link
My public shared files are all in this folder [ Ian McCrum (MI5AFL)'s Google Drive/Blogfiles ] or subfolders beneath it.
