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 is
> 3.5"
> > 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.
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