[TowerTalk] ferrites for antenna tuners?

[Jim Lux]

I'm designing a computer controlled matching network for HF (1.8-30 MHz), 
and I'm looking for suggestions as to the type and size of the toroids to 
use in the switchable inductors. Say we're handling currents/voltages at 
1kW and higher levels (particularly where there's a lot of reactive 
power).  Stacking toroids is fine to keep the flux reasonable at higher 
turn numbers.  There's also a compromise between loss and heating of the core.