Yep, the tech is as old as dirt. It's all in the math of the L/C (Elsie) calculations. When you hit the sweet spot, all is well. Variations in core materials, capacitor tolerance, and winding technique will necessitate some tweaking of the windings, spreading, narrowing, adding, or removing a turn as needed. It's all part of the fun!
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72/73 de Steve, K9NUD
K9NUD-Steve