[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: curious TC questions on Freq. limits



Original poster: "robert heidlebaugh by way of Terry Fritz <twftesla-at-qwest-dot-net>" <rheidlebaugh-at-desertgate-dot-com>

Jan: Tesla tested frequencies from DC to 400Mhz to find the best for his use
and size. Today we consider other thinge like 57MHz TV band and FCC that
Tesla was not bothered with, so we are quite limited in what we can do.
   Robert  H

> From: "Tesla list" <tesla-at-pupman-dot-com>
> Date: Tue, 08 Oct 2002 12:10:35 -0600
> To: tesla-at-pupman-dot-com
> Subject: Re: curious TC questions on Freq. limits
> Resent-From: tesla-at-pupman-dot-com
> Resent-Date: Tue, 8 Oct 2002 12:24:36 -0600
> 
> Original poster: "Jan Wagner by way of Terry Fritz <twftesla-at-qwest-dot-net>"
> <jwagner-at-cc.hut.fi>
> 
> Hi,
> 
> On Tue, 8 Oct 2002, Tesla list wrote:
>> Original poster: "by way of Terry Fritz <twftesla-at-qwest-dot-net>"
> <CoolCorals-at-aol-dot-com>
>> Hello, I have been curious about a few things with a tesla coil.
>> First:  I have read some of tesla's patents and articles.  It seems
>> Tesla talks of a TC running in the MHZ to 100MHZ ranges, has anyone done
>> this?  Is it possible?
> 
> There's a project paper around in which a group made a 5 MHz TC.
> Naturally, at 5MHz the coil size is tiny, it is prone to detuning
> (just thinking about driving it with a 5 MHz signal generator), and input
> power has to be quite small to prevent this small TC from burning up.
> Energy "losses" are high.
> 
>> Second:  It seems that tesla often used DC for the input to his TC's,
>> and the rotated a "contactor" to determine input frequency.  How does
raising
>> or lowering the input frequency from 60 hz change the resonant frequency?
> 
> Doesn't affect it at all. The resonant frequency/ies of neither the tank
> nor the TC secondary depend on what exactly you use to feed the TC.
> 
> But, changing the contactor speed (rotational spark gap?), you will change
> the energy per bang. That depends on the supply VA rating and frequency,
> and how you charge, and what kind of supply it is (DC, AC, 3-phase).
> 
> Someone else on the list will probably know better what Tesla tried to do
> with DC and the rotated contactor... :-) My guess is that he was just
> determining the optimum time (i.e. bps) to fire the gap/close the
> contactor, which is after the tank cap has been fully charged up to DC
> supply voltage. Something like T_charging >= Z_out_supply * C_tank, or so
> 
> 
> - Jan
> 
> --
> *************************************************
> high voltage at http://www.hut.fi/~jwagner/tesla
> Jan OH2GHR
> 
> 
>