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Re: [TowerTalk] OT: Inductor Calculator

To: towertalk@contesting.com
Subject: Re: [TowerTalk] OT: Inductor Calculator
From: jimlux <jimlux@earthlink.net>
Date: Wed, 27 Feb 2019 06:20:40 -0800
List-post: <mailto:towertalk@contesting.com>
On 2/26/19 9:06 PM, Gedas wrote:
Once upon a time I found a site that had an awesome online calculator for calculating the inductance of single layer coils where you could specify an insulated wire like #14 THHN along with coil dia, length, etc.

Does anyone have a URL for that or something similar? TU !



Wheeler formula:

L(uH)  = R^2  * N^2 / (9 * R + 10 * L)

R = coil radius in inches
L = coil length in inches
N = number of turns

Wire gauge and insulation do not change the inductance very much. Insulation, in particular will change the self C and the self resonant frequency.

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