Stephen,
Have you ever used "mini ringcore calculator" from DL5SWB? Works fine
'73 Johan- PA0TAB
----- Oorspronkelijk bericht -----
Van: Stephen
Aan: QRPLabs@...
Verzonden: zaterdag 27 augustus 2011 12:19
Onderwerp: [QRPLabs] Toroids - a note of caution.
If you can it is always worth measuring the inductance of a toroid core rather than relying on the various charts and on line calculators that tell you how many turns equate to an particular inductance.
I was making an LPF for 20 meters the other day and discovered that the chart I was using told me I needed 17 turns for a particular inductance, however when I measured the inductance I only needed 15 turns. With the extra turns the LPF would not have performed as required....
73s Steve G0XAR
