I'm taking liberty to forward this from being posted on Antennas
Reflector.
"An interesting analysis by Dr Sevick in his book 'Building
and using baluns and ununs' in appendix IV. He analyzed
the loss of powdered iron type 2 as a loading coil and
shows that up to about 2.8Mhz, it has lower loss than a
typical loading coil, and at about 1Mhz, it can't be beat.
He claims that its use is justified on the 160 meter band.
Pat W0OPW"
>
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