From: dk4xp@arcor.de   
      
   Am 09.11.25 um 18:45 schrieb Jan Panteltje:   
   >> john larkin wrote:   
      
   >   
   > ?Lots of surface area helps keep the   
   >> skin resistance down and helps cooling. Spacing the turns reduces   
   >> proximity effect and lets air in. Litz might work too.   
   >   
   > I am a bit careful about using Litz, have seen things get so hot it almost   
   went on fire (some old TV set transformers).   
   > Never use it myself..   
      
   I used it for a shortwave preselector with Siemens K1 pot cores.   
   Q > 400, avoid to put copper near the air gap. (eddy currents)   
      
   Gerhard   
      
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