Link to PowerPoint Presentation: https://drive.google.com/open?id=1PFuAPcpZOdam6kVJabuwAsT8XnDqM8I6
Hex and Flex getting started 1, 2, and 3: https://hexandflex.com/category/uncategorized/
Electronics Notes, What is a VNA?: https://www.electronics-notes.com/articles/test-methods/rf-vector-network-analyzer-vna/what-is-a-vna.php
nanoVNA vs. Keysight N9913A at HF: http://ae5x.blogspot.com/2019/09/nanovna-vs-keysight-n9913a-at-hf.html
Original Project at GitHub: https://github.com/ttrftech/NanoVNA
RTL-SDR posts about NanoVNA: https://www.rtl-sdr.com/tag/nanovna/