[Amps] Guidelines.....toroids for tank ckts

[Manfred Mornhinweg]

> I wonder what the permeability is of a jelly filled donut?

It might be rather lossy. The resistive permeability might be larger 
than the inductive one. But once the jelly is hot, eat it, it tastes 
good when hot. That will leave you with a high-Q donut.

A year ago I was on a trip on a sailboat, and the autotuner of my TS-450 
absolutely didn't want to tune up the backstay on 80 meters. So I wound 
a loading coil on a peanut butter jar. A few days later we ate the 
peanut butter, forcing me to move the turns a little closer together on 
the empty jar, to maintain proper resonance. There didn't seem to be 
much difference in performance. Peanut butter has low permeability, and 
apparently pretty low loss too.

Manfred.


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