From: jeroen@nospam.please   
      
   Phil Allison wrote:   
   >  Jeroen Belleman wrote:   
   > ===================   
   >> Iron is good in low-frequency transformers because it has a high   
   >> saturation field and high permeability, so you can get away with   
   >> relatively few turns for the windings. Its disadvantage is that it   
   >> is conductive, so there will be eddy current losses, which get   
   >> rapidly worse with higher frequency. Those losses can be reduced   
   >> by making the core out of thin insulated laminations, but this   
   >> gets impractical quite fast.   
   >>   
   >   
   > **  Typical iron core transformers intended for 50/60 Hz can be used to   
   20kHz and beyond with no such issue.   
   >      As the operating frequency rises, core magnetisation falls cancelling   
   any rise in losses.   
   >   
   >   
   >   
   > .......  Phil   
      
   Why isn't laminated iron good for RF transformer cores then?   
      
   Jeroen Belleman   
      
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