Introduction to using NanoVNA
Original Powerpoint file by myself downloadable from link below.
https://www.astronomy.me.uk/wp-content/uploads/2025/07/NanoVNA_Hydrogen_Line_Basics.pptx
astronomy.network The Website of Lichfield Radio Observatory (LRO)
Andrew Thornett, Lichfield, England, M6THO, andrew (at) thornett (dot) net