On Fri, Jan 31, 2025 at 02:51 PM, Brian Beezley wrote:
My results are somewhat different, especially Q. I don't know for sure that
the core is type 6, but it's bright yellow and matches the current photos at
Amidon where I got it years ago. I recall I was using type 6 at the time for a
project. Inductance measured about 270 nH and Q 200 at 14.1 MHz after I spread
the turns a bit. 0.5" leads.
There can be some variation in production batches. Amidon does not make their own cores - they buy them from suppliers like Micrometals and Fair_rite.
The wire diameter and how you wind can affect inductance and resistance at a particular frequency. Subsequently Q is affected. Your inductance is pretty close to the calculated value for 8 turns. Here is a graph from Micrometals showing Q with 12 turns of #20 on a T37-6. Using smaller wire would lower Q.. Results are close to what you measured.
Roger Need
