Re: Q's ? Q's ? Q's ?

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

Original poster: "Sietze by way of Terry Fritz <twftesla-at-uswest-dot-net>" <s.van.de.burgt-at-hccnet.nl>

Thanks for telling me. Are there any url's known by you ore somebody else
about this. Which you might wanna share with me?
Greetings from Holland

Sietze

----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Monday, April 09, 2001 7:52 PM
Subject: Re: Q's ? Q's ? Q's ?


> Original poster: "Jim Lux by way of Terry Fritz <twftesla-at-uswest-dot-net>"
<jimlux-at-earthlink-dot-net>
>
> > About operating a coil in a high vacuum
> >
> > > If the voltage is high enough it will become a vacuum emitter I
> > > expect. In fact, it might well gain a net charge through emission
> > > rectification (can lose electrons but not much else).
> > >
> > How high does the voltage need to be to let it become a vacuum emitter
???
> > Is it possible to do the same with a VTTC ?
>
> Actually.. you'll start to get some emission at a few hundred volts.  More
> of an issue in a vacuum will be X-rays... around 20-30 kV you start to get
> significant xray emission in a vacuum. (you DO need a target, by the way)
>
>
> >
> > > > 2. Is it possible to operate a coil on a higher frequency than it
was
> > > > designed for. I mean Mhz instead of Khz or maybe even Giga!hertz?
> > > > Would it just burn up more quickly or do nothing because of
> > > > hysterislus (how do I translate that right?). Is is posible to make
a
> > > > coil for that specific purpose?
> > >
> > > Short answer - no. It won't behave as you'd expect at any frequency
> > > other than its natural 1/4 wave frequency. At higher harmonics, it
> > > will develop voltage antinodes along its length. It would present
> > > complex impedances whose identities would vary according to frequency
> > > to the drive source.
> >
> > Is it possible to design and Build a Coil specifically for the Mhz or
Ghz
> > band ?
> > It doesn't need to spark, it just needs to build a high potential.
>
> Yes.. although at higher frequencies, you don't use lumped circuits like a
> TC, but, instead, go to a transmission line approach.  The transmission
line
> would be of reasonable size (2.5 meters long at 30 MHz, for instance).  In
> fact, this scheme is used in radars to protect the receiver when the
> transmitter is on.  Put a 1/4 wave stub with a easily ionized gas across a
> gap at the end.  If significant power is coming down the line, the voltage
> on the stub rises, "turning on the ionization", shorting the stub, and
> limiting the voltage
>
> >
> >
>
>
>