Somewhere there must be a formula for the inductance of a hand-wound coil.
Air core, one layer of wire (of given swg) close-wound, diameter of former (cardboard, probably inside of toilet paper roll), length of coil,... (what else?), therefore inductance equals ...
Yep a dozen. I have spreadsheeet labeled the Nagaoka Formula that is supposed to be very accurate. You can search for it, But I think these use his formula,
If you want a deep understanding, with Nagaoka.
Otherwise, dig into these. Or just the first one.
use the second on this page.
That's enough so you will never know who is correct :-) I ecpect
The ones I have used is Professor Coyle, and I had a downloaded version, so haven't tried the online version and electronbunker.
BTW single layer solenoid-wound coils usually hit the calculate values spot-on, it doesn't start to get hairy until you add layers. There's a formula that takes into consideration the diameter/length ratio too, but for simple single layer coils try the "Amateur Radio Handbook."
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