From: legg@nospam.magma.ca   
      
   On Sat, 08 Nov 2025 08:32:27 -0800, john larkin    
   wrote:   
      
   >On Sat, 08 Nov 2025 08:35:47 GMT, Jan Panteltje    
   >wrote:   
   >   
   >>>Bill Sloman wrote:   
   >>>>On 8/11/2025 6:23 am, Jan Panteltje wrote:   
   >>>>> liz@poppyrecords.invalid.invalid (Liz Tuddenham)wrote:   
   >>>>>> Bill Sloman  wrote:   
   >>>>>   
   >>>>>> On 7/11/2025 10:41 am, john larkin wrote:   
   >>>>> [...]>   
   >>>>>>> A real inductor is a nightmare. Especially a long solenoid. Every turn   
   >>>>>>> inductively couples to every other turn with all possible coupling   
   >>>>>>> coefficients. Distributed capacitances will be similarly complex.   
   >>>>>>   
   >>>>>> This is ignorant nonsense.   
   >>>>>   
   >>>>> I suspect the ignorance is yours.   
   >>>>   
   >>>> John is largely right   
   >>>> I have wound big RF coils (MHz) for my shortwave transmitter for high   
   power,   
   >>>> several 100 W, on just a simple ceramic former, since the sixties.   
   >>>> The mil sets do the same, that is where I got the idea.,   
   >>>>   
   >>>> Same for small cores,   
   >>>>   
   >>>>   
   >>>>> I worked for a company that built its reputation on the R.F. inductors   
   >>>>> it designed; these factors were among the many problems they tackled.   
   >>>>   
   >>>> I wind almost everything I need myself.   
   >>>   
   >>>Coil-winding machines make that relatively easy. When I worked in a lab   
   >>>that had one, I did too.   
   >>>   
   >>>The Cambridge Instruments coil-winding shop on the production line had   
   >>>some very experienced coil winders, and they could wind finer wire than   
   >>>I could without breaking it. Sometimes that mattered.   
   >>   
   >>Yes, I had some small defective motor with a coil with wire so thin I could   
   not handle it,   
   >>could hardly see it.   
   >>Was for the turntable in my microwave, ordered a new motor, fixed.   
   >>Water had gotten into that motor (overcooking ;-) and burned a hole through   
   several layers of windings.   
   >>Thinner than hair enamel coated copper.   
   >>   
   >>   
   >   
   >Our newest microwave doesn't have a turntable and seems to not need   
   >one.   
   >   
   >It's a Panasonic with great thermals and a repulsive user interface.   
   >   
      
   Not sure, but the alternative is a rotating reflector, that you can't   
   see unless you take the box apart.   
      
   RL   
   >Highland Tech Glen Canyon Design Center   
   >Lunatic Fringe Electronics   
      
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