Capacitance and Q

Additional compared to what? You can't very well compare a given coil geometry to that same geometry without winding capacitance!

Oh, I read somewhere recently that "interwinding" capacitance is, at least in single-layer coils, usually tiny compared to coil-to-universe capacitance. That makes sense, since the voltage between turns is usually small.

John

losse are propotionally and incremeantal additons of the actual resitnace of the wire.. the real culprit with added winding is inter widing capciatace, as small as it may be, each loop adds more stray cap blues, and the result is a lower selfresonsnce. this ultimatley limits the useful frequency range of that inductor..all a proportion balancing act, as always

Marc

I guess it depends on dielectric losses.

AIUI, parasitic capacitance is just like an external capacitor.

Bye. Jasen