## 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;

Calculator has been recreated at 2017-12-5, please refresh the browser cach.

ENTER THE INPUT DATA:
 Select units: mm/cmmil/inch AWG → 000000000012345678910111213141516171819202122232425262728293031323334353637383940 SWG → 7/06/05/04/03/02/001234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950

 L = mHμHnH – Required inductance

Ferrite rod parameters:
 lf = – Length of the rod df = – Diameter of the rod µ = – Initial magnetic permeability

Coil parameters:
 dc = – Diameter of the coil-former s = – Shift from the rod center dw = – Wire diameter p = – Winding pitch

RESULT:
 N = – Number of turns µeff = – Effective magnetic permeability of the rod lc = – Length of the winding

The calculator is based on the article "The-Inductance-of-Ferrite-Rod-Antennas-issue-3.pdf" by G3RBJ.

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