[Amps] Line Isolators for RF feedback

[peter.chadwick at Zarlink.Com]

Ferrites used in non-transmission line transformers can get quite hot at 
high power levels e.g.40kW. I've seen 50 - 600 ohm 40kW xfmrs: they used 2 
legs, each with 24 rings stacked. Each ring was 6 inch od, 4 inch id, 3/8 
thick, and had a sheet of aluminium as a heat sink between each ring. They 
got quite hot, even so, although they weren't pushed far enough around the 
BH curve to cause measurable harmonics or intermodulation.

I guess the design principles were basically the same as mains 
transformers!

73

Peter SM/G3RZP