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If you have access to an LCR meter I suggest you measure the toroid windings.
I’ve built one (QCX40) and I had to take off a couple of turns. From my notes I reckoned it was around 0.1uH/turn.
It also depends on how ‘elegant’ the windings are. I.e. loose v tight. That will change readings a bit.
Try this. You won’t break anything.
On 18 Nov 2019, at 02:27, william.wallace1@... wrote: