[TowerTalk] Fair rite materials for choke baluns

[Richard (Rick) Karlquist]

On 7/5/2016 11:00 AM, Steve Hunt wrote:
> Do the maths on saturation - you'll find that core overheating occurs
> well before saturation for the duty-cycles typical of Ham operation.
>
> To quote Amidon: "Overheating of the core will usually take place long
> before saturation in most applications above 100kHz."
>
> Steve G3TXQ

This generalization is valid for cores with an air gap and
powdered iron cores (which essentially have a built in air gap).
It most definitely doesn't apply to closed gap ferrites,
such as toroids.  One dit can not only saturate them, but
actually magnetize them.  I have actually done this, accidentally,
when I tried to use a current transformer and the secondary
was unloaded.  It was something of a corner case since the
primary of a current transformer is only 1 "turn".

Rick N6RK