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.
I'm confident the bead entries on my chart are correct.
On 17/04/2012 08:04, Jim Thomson wrote:
> #### Look at Steve Hunts bar charts. His bead baluns depict a MAINLY
> resistive component
> across the spectrum. That’s the thin black line below.
> Steve only did 2 x bead baluns, one with 6 beads, and the other with 10
> beads..and both bead
> baluns used type 31 material.
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