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Re: LF: Coil Calculation

To: [email protected]
Subject: Re: LF: Coil Calculation
From: "Dick Rollema" <[email protected]>
Date: Mon, 10 Feb 2003 13:46:18 +0100
In-reply-to: <[email protected]>
References: <[email protected]>
Reply-to: [email protected]
Sender: <[email protected]>
Thanks Jim!

A very nice and useful program.

73. Dick, PA0SE

At 15:57 6-2-03 +0000, you wrote:
Dear Peter, LF group,

I have used a simple DOS program coil.exe (runs OK in windows DOS box) which can be downloaded as from
with reasonably accurate results for several types of coil. This implements one of several text-book formulae depending on what menu option you chose - it does loops, round and square solenoids, toroids etc. The Decca type basket-weave coil is probably best represented by a multi-layer circular solenoid (option 7). Don't forget to set the dimensions (option 11 - inches or cm).

Do not expect very accurate results with this type of coil - all the formulae ignore distributed capacitance, which makes L frequency dependent. Multi-layer coils are obviously susceptible to this, which makes the apparent inductance higher.

Cheers, Jim Moritz
73 de M0BMU

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