Lowrance device update

For lack of a name, for now I'll refer to my old solid-state magnetic design as the Lowrance device.

After applying a thin coat of Liquid Paper on the Metglas MAGAMP core, MP1903P4AS, I did a permeability comparison. The permeability experiment consists of a soft ferrite C shaped core with about 18 turns. The inductance is measured. The I place a MP1903P4AS Metglas MAGAMP toroid core underneath the C shaped core to see the change in inductance. The difference in inductance is the change in effective permeability.

The above permeability experiment was done twice. One with a MP1903P4AS toroid that has a thin coating of Liquid Paper. This experiment was repeated, except a MP1903P4AS toroid without Liquid Paper was used. The MP1903P4AS Liquid Paper core had a permeability difference of 3.1 to 1. The MP1903P4AS without Liquid Paper core had a permeability difference of 10 to 1.

So, even a thin coating of Liquid Paper makes a huge difference, but that's not unexpected since it's well known that air gap distance makes a huge difference in effective permeability.

If I use the MP1903P4AS and C shaped soft ferrite cores for the Lowrance device, I'll use the core without Liquid Paper, which will be a pain in the butt to wind. 

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