Pretty high Q values can be achieved if you choose the toroid mix and
the winding spec carefully.
For example, according to the Micrometals Q Curve Application
Information book a T200-6 core wound with 30 turns of #18 wire achieves
a Q >300 across the range 1.5MHz to 7.5MHz, and peaks at over 400.
That's significantly better than a commercial air-cored roller-inductor
I measured at the same inductance value.
73,
Steve G3TXQ
On 18/02/2013 01:54, Bob McGraw - K4TAX wrote:
I'll take an air-wound inductor over a toroidal inductor any day,
space available. The typical loss in an air-wound inductor is IR loss
where a toroidal has IR loss plus eddy current loss.
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