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On Sun, 13 Aug 2006 15:02:03 +0100, "Reg Edwards"
wrote: "Cecil Moore" wrote Reg Edwards wrote: A coil 6.6" long, 6" diameter, 26.5 turns, has L = 68 uH, Q = 500 at 3.8 MHz, and self-resonant frequency = 9 MHz. Wouldn't mounting the coil four inches above a GMC pickup ground plane reduce the Q and the self-resonant frequency? -- ====================================== Cec, Very likely. But not very much. It would not be the self-resonant frequency any more. The srf never changes. And neither does the intrinsic coil Q. We must be careful with our descriptions. Slackness leads to misunderstandings, arguments and fights. ---- Reg Reg, I had never given much thought to the series relationship of the capacitance between turns. I had always considered them as being in parallel, thus the honeycomb, or the basket-weave configurations to minimize the interturn capacitance. Have I misconstrued the purpose of those configurations? Do I also understand you correctly that with a specified length of the solenoid, and a given diameter, the total interturn capacitance is independent of the number of turns, because the capacitance between turns adds in series to the same value regardless of the number of turns? Please educate me. Walt |
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