How to create an inductor 2.mH with a toroid core ferrite?

>W-T600-2MM from 3G Shielding.

I have their designer's kit, but they seem to have roughly zero distribution. Where do you buy it?

Cheers

Phil Hobbs

 

[whit3rd]

On Tuesday, July 2, 2019 at 9:56:35 AM UTC-7, John Larkin wrote:

On Tue, 02 Jul 2019 05:49:26 GMT, Jan Panteltje
pNaOnStPeAlMtje@yahoo.com> wrote:

I have used those ceramic coil formers with tubes, class B output linear
with 500 V anode voltage (~1 kVpp) 250 W CW, about 7 MHz, mounted on a steel plate,

The coil could be wound tight on an alumina or AlN rod, which would
spread out the heat some. A machined spiral groove would be ideal, but
hard to fabricate.

Some precision power resistors were made with metal-film on porcelain tubes with V-groove
helix windings; a grinding operation leaves metal in the grooves and you just stop the
grind when the resistance is right. Look closely, you can see (under the paint)
where the mass-produced 'coil' is.

Somewhere out there, a resistor manufacturer has the machinery to make your dream
gizmo, you just have to find her/him. And convince the assembly line to electroplate
conductor on top of the resistive metal layer.