FW: VSWR Voltages

To: "'Tesla List'" <tesla-at-poodle.pupman-dot-com>
Subject: FW: VSWR Voltages
From: Tesla List <tesla-at-stic-dot-net>
Date: Sun, 9 Nov 1997 15:30:51 -0600
Approved: tesla-at-stic-dot-net

From: 	Malcolm Watts[SMTP:MALCOLM-at-directorate.wnp.ac.nz]
Sent: 	Sunday, November 09, 1997 3:46 PM
To: 	Tesla List
Subject: 	Re: VSWR Voltages

Hi John,

> From:   John H. Couture[SMTP:couturejh-at-worldnet.att-dot-net]
> Sent:   Friday, November 07, 1997 11:32 PM
> To:     Tesla List
> Subject:    Re: VSWR Voltages
> 
> At 03:29 AM 11/7/97 +0000, you wrote:
> >
> >From:  Malcolm Watts[SMTP:MALCOLM-at-directorate.wnp.ac.nz]
> >Sent:  Thursday, November 06, 1997 5:47 PM
> >To:    tesla-at-pupman-dot-com
> >Subject:   VSWR Voltages
> >
> >Hello all and John Freau in particular,
> >                                        I have had the opportunity to 
> >read some more material from the Corums and it would appear from this 
> >that they are *claiming* that the 10X leap in voltage is real (despite 
> >the waveform drawings in the ITS notes). I need hardly add that I 
> >have considerable doubts about this but will do some further 
> >investigation with the storage scope in a couple of weeks time. From 
> >what looks like yet another drawing in the latest material (circa 
> >1992) it looks as though quenching at any particular time has nothing 
> >to do with the phenomenon so if it is real it should be observable 
> >any time the gap quenches which, from the latest literature, would 
> >appear to be way after the optimum time to trap all initial primary 
> >energy in the resonator. I will try looking for it without a top hat 
> >on the resonator and see if that gets anywhere.
> >
> >Malcolm
> >
> -------------------------------------------------------------------
> 
>   Malcolm -
> 
>   The 10X voltage does sound high but may be possible. Does your scope have
> enough bandwidth to pick out those 10X voltage transients if they are in the
> less than microsecond range? Also, the display settings may have to be
> changed to show these transients compared to showing a good waveform. I know
> with a regular scope there are plenty of transients which appear to be noise.
> 
>  John Couture

In answer to question one, I would think a storage scope with a 60MHz 
bandwidth would be plenty at TC frequencies. But C&C are not talking 
about this happening in the sub-uS range. To the contrary. Check the 
1990 ITS notes to get an idea of the timescale. I have captured 
10MHz spurii easily using it with a sufficiently high speed timebase.
    BTW, I think the 10X scenario is rubbish. I did some experiments
on the weekend and saw not a jot of it. I have two captured waveforms 
in the scope right now.

Malcolm