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I was perusing "Q-Curves for Iron Powder Cores" and noted that Mix #1 for the 10uH inductor had it's typical Q in the .15 to 3 MHz range. The actual measured Q examples (page 8), were for 100 turns on a T50-1 with a Q of 120. Without having one to measure, I would guess that the Q curve would move up in frequency with only 32 turns.

I then checked out the new VK3CPU toroid calculator and plugged in 22 turns on an FT50-67. This also gives ~10uH of inductance, but the calculated Q is quite broad: 106 @ 1.82 MHz, peaking at 202 at 15.5 MHz, and dropping to 173 at 29.5 Mhz.



Is there any reason why a ferrite core couldn't be used for this inductor? It's curie temp is well over 400 C. I see that digikey has Fair-Rite 5967000301 for little more than a dollar in single quantities.

Thanks in advance de va3rr

Hi.
Because a hysteresis loop.
You will need a really big ferrite core to hold 10W RF power with good Q.?