Re: Rotary Spark Gap Design

• To: tesla-at-pupman-dot-com
• Subject: Re: Rotary Spark Gap Design
• From: Malcolm Watts <MALCOLM-at-directorate.wnp.ac.nz>
• Date: Thu, 16 May 1996 16:45:48 +1200

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

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