Re: Swordlike RF Envelope (Oscilloscope)

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Stephen Conner by way of Terry Fritz <teslalist-at-qwest-dot-net>" <steve-at-scopeboy-dot-com>

At 10:33 25/05/03 -0600, you wrote:
>Original poster: "by way of Terry Fritz <teslalist-at-qwest-dot-net>" 
><dhmccauley-at-spacecatlighting-dot-com>
>
>Just wanted to post the RF envelope from my dual 833A VTTC during extremely
>straight swordlike operations.

I just saw Richie Burnett and James Riggs demonstrating SSTCs at the UK 
Teslathon. Both produced very nice sword sparks. They were running at 50pps 
but if they had been staccato'd to a lower rate the results would probably 
have been very similar to the pics that Steve Ward and Cap'n Corona have 
shown us.

Both of these coils used a full-bridge of 15A MOSFETs running off 240V 
half-rectified line. Resonant frequency around 400kHz. The peak power was 
over 3kW which is similar to a dual 833A VTTC. Although they were 
oscillator-based SSTCs they used a VCO circuit that makes the frequency 
change in sympathy with the DC link voltage. I think there are more details 
of this design on http://www.richieburnett.co.uk/

I got a couple of decent photographs of the sparks. My website will be down 
for a while but pictures (either mine or someone else's) will hopefully 
appear somewhere sooner or later.

Steve C.