Steve Hunt wrote:
> Paul,
>
> I made the measurements myself. The inductor was in the open, sitting on
> a wooden baseboard. It had a "tapered pitch".
>
> The Qs I measured seem to be similar to those measured by Tom W8JI who
> says this on his web site:
>
> "The trend of Steve's data agrees with my measurements, although there
> are differences in data because I measured different inductors. I
> measured less peak Q, but also significantly higher minimum Q in the
> inductors I tested. While the inductors I measured has less delta in Q,
> they also had a serious dip in Q up near 25-35 MHz when near
> half-inductance."
>
What were the physical dimensions of the inductors? Any estimate of the
self C? (on a tapped inductor, you can use a Medhurst approximation to
get within 5% or so).. the self C can make the "inductance as a function
of turns or length" be kind of weird, particularly near self resonance.
Maybe we could just model some inductors in NEC?
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