[Elecraft] Loading inductor Question

[Ron D'Eau Claire]

All of that heat is produced by RF heating the core instead of being
radiated. It's all a matter of what you want to do with your RF :-)

One concern is the curie temperature - that temperature where the properties
of the core change dramatically. In an antenna matching network (a.k.a.
"tuner") the will cause the SWR seen by your Tx to change - often
dramatically. 

73, Ron AC7AC

-----Original Message-----

MFJ-902 tuner uses a single toroid with taps. The toroid becomes hot on some
frequencies with 100W but survives. I guess losses are small compared to
convenience of a very small unit.

>From what I understand, the iron cores can have Q in excess of 300 if 
>they
are below saturation. How much will they can handle depends on the load. A
reactance of 300 will add a resistance loss of 1 Ohm, and a reactance of
3000 will add 100 Ohm.  So the same toroid can handle KW with a longer
vertical but could overheat at 100W with a short vertical. 

Ignacy