Here are some links to presentations that I have done for various amateur radio clubs and Ham Conventions.
Hamcation 2025
The Truth About Antenna Tuners https://docs.google.com/presentation/d/1eEWbSqBpcBP3VbGyTHFVyxCelTQRiHzYyLGSG3GelvA/edit?usp=sharing
Various other presentations
Characteristic Impedance and SWR
https://docs.google.com/presentation/d/1BUa-MtdJtPBQhv2xweVD09pwLTZlQBNOLtrHLc751Eg/edit?usp=sharing
Antenna Tuners and Transmission Lines
https://docs.google.com/presentation/d/1atFnq02_RLH0DRIuF-qv_tZYh-CyTywZYeaXNH93VnU/edit?usp=sharing