Dear Peter, LF group,
I have used a simple DOS program coil.exe (runs OK in windows DOS box)
which can be downloaded as coil02.zip from http://www.moshier.net/coildoc.html
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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