On 13 Dec 2024, at 16:06, Brian Beezley via groups.io <k6sti@...> wrote:

The calculated inductance value includes self-capacitance. Some people call this effective inductance, but I just call it inductance since that's what you would measure with an instrument. Internally I calculate low-frequency inductance and self-capacitance and then combine them. Q depends on wire and lead resistance, skin depth, the proximity effect of nearby coil turns, and coil form loss. I model form permittivity as constant but form loss tangent varies with frequency. You can use custom dielectrics if you want. Incidentally, a coil generally has maximum Q at about 45% of SRF. For best performance you don't want to operate too far below self-resonance.

I think the value of the program is to find optimal coil dimensions. For many coil applications there's no need to maximize Q. But when its important, such as for antenna loading coils or traps, the optimizer can save a lot of experimentation. Then build the coil and check it with a VNA.

I took your coil and optimized the number of turns and coil length. The result is shown below. I suspect you may be using metric units. Click on " for mm.

Brian





<opt.png>