Ludwig,?
? ? Am I understanding that you were finding T37-17s to measure 25%+ high when you wound them??
And your further work with T37-10s is validating your measurements?
I'm working on a QDX HB, with the T37-17s. I've been trying to measure the toroids by using a series LC circuit with a capacitor, and using the frequency of resonance to find the inductance. With 12 turns on a T37-17, I was somewhere around 0.35uH. Taking it all the way down to 8 turns got me 0.22, and 10 turns on another got me 0.248. (Target is 0.202 and 0.25).??
On one with more windings, I found I needed 20 turns (to get 0.74uH) instead of the 21 listed to get to the 0.722 target.?
I'm questioning my measurements, especially at low turns.....Modeling the QDX 17/15 LPF in Elsie...I find that one is pretty sensitive to getting the inductance values correct.?
If my 8 and 10 turn windings are really closer to the calculated 0.10 and 0.15 that Toroids.info comes to, the input SWR of that LPF gets REALLY bad... But if my measurements are correct, then the filter performance is right where it needs to be.?
I'm considering building a whole LPF on a breadboard and measuring the response to help validate what I've measured (jsut like you did), but just double-checking that you were seeing high AL values with the T37-17s.?
-Nate?
N8BTR
