Coil on a ferrite rod.
Calculating limitations:
- The winding pitch cannot exceed the doubled wire diameter;
- Coil diameter cannot be greater than the doubled diameter of the rod ;
- Winding length should be less than 3/4 length of the rod;
- When the coil is shifting it should not reach the edge of the core 1/8 of its length;
- The initial magnetic permeability of the ferrite should be greater than 100;
You can download the cross-platform app Coil64 to calculate an inductance coil on a ferrite rod offline.
ENTER THE INPUT DATA:
| Select units: |
| L | = | – Required inductance |
Ferrite rod parameters:
| lf | = | – Length of the rod |
| df | = | – Diameter of the rod |
| µr | = | – Relative magnetic permeability |
Coil parameters:
| dc | = | – Diameter of the coil-former | |
| s | = | – Shifting coil center from the rod center | |
| dw | = | – Wire diameter | AWG |
| p | = | – Winding pitch | Automatic |
RESULT:
| N | = | – Number of turns |
| µeff | = | – Effective magnetic permeability of the rod |
| lc | = | – Length of the winding |
Copyright ©2017 Valery Kustarev
The calculator is based on the article "The-Inductance-of-Ferrite-Rod-Antennas-issue-3.pdf" by G3RBJ.
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