[TowerTalk] Tuners

[jimlux]

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?