Re: Many uBitx's have reduced power on 40m CW
The AL of a T30-6 core can vary +/-5% of the nominal value, and inductance is proportional to AL.toggle quoted messageShow quoted text
Yet another handy factor to blame bad results on.
Inductance is proportional to the square of the turns count.
Having 8 turns instead of 9 is a 100*(9*9-8*8)/(9*9) = 21% reduction in inductance.
Different spacing around the core and loose vs tight windings can make a sgnificant difference.
As you have noticed.
On Wed, Apr 7, 2021 at 04:27 PM, Evan Hand wrote:
The most recent observation is that there is a HUGE variation in the inductance of the toroids depending on the turns AND the spacing.