Re: Tube Type Tesla Coils

To: tesla-at-poodle.pupman-dot-com
Subject: Re: Tube Type Tesla Coils
From: Tesla List <tesla-at-stic-dot-net>
Date: Sat, 15 Mar 1997 01:48:44 -0600
Approved: tesla-at-stic-dot-net
Subject: 
        Re: Tube Type Tesla Coils
  Date: 
        Fri, 14 Mar 1997 04:28:01 -0700
  From: 
        "DR.RESONANCE" <DR.RESONANCE-at-next-wave-dot-net>
    To: 
        "Tesla List" <tesla-at-pupman-dot-com>


Hi John:

We did make some measurements of VSWR on a few of our 1 MEV coils
operating
in a pulsed mode using an National 7703 ignitron to fire the cap.

I will look in some our our old journals and see if I can dig out the
exact
setup for you.  DC will be going to California in April so I will send
the
journal out to him if I can find them.

DR.RESONANCE-at-next-wave-dot-net

 
> Subject: 
>         Re: Tube Type Tesla Coils
>   Date: 
>         Fri, 14 Mar 1997 07:38:32 +0000
>   From: 
>         "John H. Couture" <couturejh-at-worldnet.att-dot-net>
>     To: 
>         Tesla List <tesla-at-pupman-dot-com>
> 
> 
> At 03:57 PM 3/12/97 +0000, you wrote:
> >To: Tesla List <tesla-at-pupman-dot-com>
> >From: richard hull <rhull-at-richmond.infi-dot-net>
> >Subject: Re:Tube Type Tesla Coils
> 
> 
> >
> >snip
> >>
> >>In fact I would be interested in hearing from anyone who has tried to
> >>measure the VSCR of a classical or tube type Tesla coil. As I said
before I
> >>did not have much success with these measurements. This surprised me
because
> >>Ham operators make these tests on radio transmitters all the time.
> >>
> >>John C.
> >>
> >>
> >John,
> >
> >The hams can make the active VSWR measurements because they aren't
tapped
> >into a 10 foot arcing output coil.  They are also looking to hit unity
VSWR
> >and their output voltage is low.  We are at the opposite end (looking
for
> >infinite VSWR) and instrumentalities for these potentials are not
common.  A
> >static or low power VSWR measurement is like a static Q
measurement...rather
> >valueless.
> >
> >Richard Hull, TCBOR
> >
> >----------------------------------------
> 
>   Richard -
> 
>   One of the problems I ran into in trying to measure the VSWR of a
> Tesla
> coil was to decide where to connect the VSWR meter. Hams connect the
> meter
> in the transmission line between the transmitter and antenna. But there
> is
> no transmission line with a Tesla coil. One way to make the test is to
> set
> up a robust oscillator and connect it to the TC secondary coil via a
> calibrated transmission line and a bridge type VSWR meter. This test
> would
> not be static and would be at low voltage. 
> 
>   The Corum's said they measured a TC at 1000 VSWR but did not say how
> it
> was done. Dr. Gary Johnson of Kansas State University measured a TC at
> 200
> VSWR. He gave some details on this test at the 1992 Tesla Symposium in
> Colorado Springs.
> 
>  The advantage of knowing the VSWR of the TC is to determine if the TC
> is
> properly tuned for maximum output. The Q factor can also be found with
> this
> test. This Q factor should then be coordinated with the operating spark
> gap
> duration.
> 
>  Has any coiler researched this parameter? This test is also related to
> the
> Smith Chart but I have not found that very helpful. The Smith Chart was
> designed for radio work.
> 
>   John Couture