Toroid-Theory

Coil64 (Coil32) - freeware coil inductance calculating app.:
https://coil32.net/ bb Fair-Rite Products Corp - Toroids (5943003801) - FT240-43:

https://www.fair-rite.com/product/toroids-5943003801/

Magnetic Field of Toroid:
http://hyperphysics.phy-astr.gsu.edu/hbase/magnetic/toroid.html#c3

LibreText.org - 11.2: Permeability of Some Common Materials:
https://eng.libretexts.org/Bookshelves/Electrical_Engineering/Electro-Optics/Book%3A_Electromagnetics_II_(Ellingson)/11%3A_Constitutive_Parameters_of_Some_Common_Materials/11.02%3A_Permeability_of_Some_Common_Materials

WSikipedia - Permeability (electromagnetism):
https://en.wikipedia.org/wiki/Permeability_(electromagnetism)

Magnetic Permeability:
https://byjus.com/jee/magnetic-permeability/#types-of-permeability

Material Survey:
https://fericor.com/material_survey/

W1CG - Low Power Balun:
https://www.minikits.com.au/doc/Low%20Power%20Balun%20Manual.pdf

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Glenn Lyons VK4PK
glenn@LyonsComputer.com.au
Ver:gnl2022 - pre published v0.9