I forgot to mention that Jim Brown's data pretty much confirms my data.
Take a look at the chart at the bottom of his page 25 here:
You'll see the chart shows Rs>Xs anywhere above about 2.3MHz.
On 17/04/2012 10:20, Steve Hunt wrote:
> I just double-checked my results for the 6 off #31 bead choke. I looked
> carefully at the ratio of the Resistive (loss) component of the choke
> impedance to the Reactive component, across the range 1MHz to 50MHz.
> Between 1MHz and 30MHz it closely tracks the complex permeability charts
> published by FairRite: in other words, below about 4MHz the Inductive
> reactance predominates, but anywhere between from 4MHz to 30MHz the
> Resistive component dominates and by the predicted ratio. Only above
> 40MHz does the choke become predominantly Reactive again, due to the
> stray C involved.
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