Hi AllWith a bipola coil would having 2 movable tap point work for changing the coupling ?
Say the coil need 5 turns to be in tune, you could built the primary with 10 turns and you could move the inner and outer taps points in or out but still keeping the 5 turns needed to keep the coil in tune, the inner and outer turns passed the tap point would be electrialy dead so to speak.
Thoughts on this one guys. Cheers Mike T On 17/10/2020 00:43, Gary Lau wrote:
Hi Kurt, Splitting and separating the secondary seems like a great way to vary the coupling, but one must also bear in mind that doing that will vary the Lsec inductance and tuning. I can't think of a way to vary only the coupling on a bipolar coil, but I have never built one. Regards, Gary Lau MA, USA On Fri, Oct 16, 2020 at 7:15 AM Kurt Schraner <k.schraner@xxxxxxxxxxx> wrote:...just my 2 cents: cutting the bipolar secondary in 2 independently movable halfs could enable the control of the coupling (see the ASCII-sketch): oooooooooooo __________________ __________________ I__________________I I__________________I <----> oooooooooooo ...the primary can be either of a solenoid or a flat spiral. Regards, Kurt Schraner -----Ursprüngliche Nachricht----- Von: Tesla <tesla-bounces@xxxxxxxxxx> Im Auftrag von jimlux Gesendet: Freitag, 16. Oktober 2020 02:15 An: tesla@xxxxxxxxxx Betreff: Re: [TCML] Coupling On 10/15/20 6:50 AM, Douglas Johnson wrote:Thank you both, I think I know where to go from here on my current build. My project is a larger bipolar than I have built to date. Secondary is3.5"dia. X 24" with .015 mag wire. By the time I built the primary it was 6" long and I was getting "runners" on the secondary. I think my fix will be going to a flat spiral primary.On a bipolar, it's hard to control the coupling on a solenoidal primary sliding it one way or the other doesn't change the flux distribution very much. I'm not sure a flat is any better. _______________________________________________ Tesla mailing list Tesla@xxxxxxxxxxxxxxxxxx https://www.pupman.com/mailman/listinfo/tesla _______________________________________________ Tesla mailing list Tesla@xxxxxxxxxxxxxxxxxx https://www.pupman.com/mailman/listinfo/tesla_______________________________________________ Tesla mailing list Tesla@xxxxxxxxxxxxxxxxxx https://www.pupman.com/mailman/listinfo/tesla
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