Down here I listed some useful resources that helped me a lot during building all my homebrew stuff published on this website.
|Extensive datasheet library for almost all components.
|Extensive information on all popular toroids (T-xx-x, FT-xx-x, etc), BN-xx-xxx, etc), and for each type an online calculator to calculate induction and other specifications.
|mRS produces the MiniVNA, a simple vector network analyzer that I use for almost any antenna project. It’s also my RF generator, and sometimes even a beacon transmitter.