I take ARRL’s QST magazine and Kathy takes their On The Air. I was perusing her magazines and ran across this – Demystifying Diplexers – ARRL On The Air July-August 2022 and found it to be a good read. I think everyone will enjoy it, particularly those of us newer to the hobby and who could use a quick primer on the difference between a diplexer and a duplexer.