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"Tim Wescott" wrote in message
... Leon Heller wrote: "Gregg" wrote in message news:t4eld.149312$df2.42254@edtnps89... I stumbled across a few at surplus outlets, I'll see if I can dig up URL's. $50 to $150 USD, depending on KW rating. You can build your own fairly simple though, for a lot less :-) An old-timer I used to know made his own from plastic drain pipe. He used a lathe for cutting a spiral grove in the pipe for the wire, and machined most of the other parts himself. 73, Leon I'm not sure I'd qualify anything requiring a machine lathe as being "simple". It is if one has a lathe. 8-) Strictly speaking, he wasn't making roller inductors, anyway, as the contact was moving across the turns giving one turn resolution, like a rheostat. He only used QRP. Making a proper roller inductor for high power like those made by Henry would be quite difficult. 73, Leon |
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