Spark Gap (fwd)
From: Jim Fosse [SMTP:jim.fosse-at-bjt-dot-net]
Sent: Wednesday, May 27, 1998 9:54 AM
To: Tesla List
Subject: Re: Spark Gap (fwd)
>From: Malcolm Watts [SMTP:MALCOLM-at-directorate.wnp.ac.nz]
>Sent: Monday, May 25, 1998 11:33 PM
>To: Tesla List
>Subject: Re: Spark Gap (fwd)
>Agreed. But Vcond does rise as Ip drops. I think Jim Fosse measured
>several kV across a series gap by the time it went out.
----- begin included messages ---------------------
>To: "Malcolm Watts" <MALCOLM-at-directorate.wnp.ac.nz>
>Subject: Re: Surplus Score
>From: jim.fosse-at-bjt-dot-net (Jim Fosse)
>Date: Fri, 06 Feb 1998 16:58:56 GMT
>I just checked. I can't see the slope for all the RF. I'm measuring
>35kV rf at my supply. My hookup for each leg is: 24kV diodes 2 0.015uF
> 6.5kV caps in series for DC filtering, 20K wirewound resistor, 10' of
> 20kV 20A.W.G. wire, 30mH aircore choke, then parallel gap with a series
>string of 16nF tank cap and 100uH ish of tank inductor across it.
>Then back to the negative supply through a 30mH aircore inductor 10' of HV
>wire and 20K wirewound resistor.
>I did measure the gap quench voltage (at the 20K resistor that is on my bench 10'
>and 30mH away from the gap). The 9 series gap quenches at 1-2kV with occasional
>quenching at 4kV. The single is very stable, quenching at between 400 and 600 volts.
> I forgot to mention that these numbers were from 1/2 of the
>supply. They should be doubled for the actual gap voltages.
>I hooked up my rotary gap. It has 2 gaps in series. Fires at 3kV and
>quenches at under 200 volts. I've got the electrodes set very close
I don't note whether the rotary voltage were from 1/2 of the supply or
if I doubled them before posting. So much for making complete notes.