Cecil Moore wrote:

Jim Kelley wrote:
With regard to coils, I think inductance is probably the more relevant
parameter. It's proportional to the number of turns and the length of
each turn of wire, and inversely proportional to the length of the
bobbin.

Is that "bobbin" a part of a coil winding machine? Coil form?

It's a spool-like object used to constrain the length and diameter of a
coil of wire to prescribed values.

73, Jim AC6XG