Continuing to work on my review of the latest 4GHz, NanoVNA V2+4.

The latest documentation and software may be found here:
https://github.com/joeqsmith/NanoVNA_...

If you have comments or suggestions on the documentation, feel free to leave them on the EEVBlog site at:
https://www.eevblog.com/forum/rf-micr...

Characterizing crystals
https://www.eevblog.com/forum/rf-micr...

Attenuators
https://www.eevblog.com/forum/project...