Re: Rotary Spark Gap Design

Tesla List wrote:
> >From MALCOLM-at-directorate.wnp.ac.nzThu May 16 21:47:03 1996
> Date: Thu, 16 May 1996 16:45:48 +1200
> From: Malcolm Watts <MALCOLM-at-directorate.wnp.ac.nz>
> To: tesla-at-pupman-dot-com
> Subject: Re: Rotary Spark Gap Design
> Hi everyone,
>              Greg, I'm glad I'm not the only one who thinks modelling
> the coil isn't simple. Just a reply if I may on transmission lines...
> > 3. Resonance - Secondary coils are highly resonant, as everyone
> > here has witnessed. Xmsn lines are, by definition, wide-band and
> > therefore non-resonant.
> I think that is only true when the line is terminated in it's Zo at
> each end making it a matched line. A piece of coax (for example) that
> has any other termination or is shorted or o/c has a high VSWR and is
> highly resonant (Y-N)? We had a problem here where a 50 ohm data link
> cable had a piece of 75 ohm coax added in by mistake. Reflections and
> high VSWR meant the link failed totally. I designed a 1.2:1 line
> matching transformer to correct this problem, one inserted at each end
> of the 75 ohm cable.
>     I think your model of a sinusoidal voltage/current distribution is
> actually quite accurate.
> Malcolm

Malcolm and Greg

Don't we really want a transmission line with a large vswr with the max 
point at the top of the coil?