Tim Wescott kirjoitti:


Ferrite cores usually have higher permitivity, which means more
inductance for the same number of winds. They also usually saturate
quicker, which means that they aren't as good for resonant circuits or
for filters.

Hi

The great advantage of ferrite materials is just what you said - more
inductance for the same number of winds.
In this way high Q coils can be done. A good example is direction
finding receiver with ferrite rod antenna for magnetical field component
of fox transmitter.

I agree that saturation can be a problem in higher power levells
Anyhow good high power baluns are made with toroids and filament chokes
with ferrite rods for grounded grid linears ( Yes- they are not tuned
resonant circuits )

73, Risto OH2BT