Re: tesla coil power ?! (fwd)

["High Voltage list" <hvlist@xxxxxxxxxx>]

Original poster: Steven Roys <sroys@xxxxxxxxxx>



---------- Forwarded message ----------
Date: Thu, 27 Sep 2007 13:12:35 +0100
From: Chris Swinson <list@xxxxxxxxxxxxxxxxxxxxxxxxx>
To: High Voltage list <hvlist@xxxxxxxxxx>
Subject: Re: tesla coil power ?! (fwd)

Hi Malcolm,


> How were they positioned relative to the transmitting coil? Equally spaced 
> around
> it?

Yes.




>You can demonstrate the effects of directors such as you find on yagi
> antennae by placing receiving coils in a line. I did that using a metal 
> bench as a
> ground plane (a long time ago).

You can't place them in a line as such, the coils in effect screen the 
transmission power. A little bit more complex than that but thats the idea.


> Have you measured the actual input and output power of your transmitter or 
> are
> you going on transformer faceplate ratings? Beware of non-sinusoidal 
> waveforms
> messing up readings on multimeters.

The transformers are current limited. If I could draw more wattage from them 
I could have used a larger tank cap for short runs.




> Some real measurements will show where the truth lies. Using the 
> brilliance of
> lightbulbs as a measure is a rather dubious proposition. It is a very 
> popular
> technique on Keelynet-type expts.


I keep telling people I charged up capacitors on DC and calculated the rate 
of charge over 20 seconds. Lamps are good for a "first order" indication. I 
was not happy with just lamps, which is why I spent a fortune on special 
diodes and worked on regular DC levels.


> These are quite common little demonstrations of e.m. coupling. Recently 
> some
> prof somewhere hit the headlines with a suggestion that HF RF could be use 
> to
> wirelessly charge cellphone batteries etc. as though it were something 
> new. I
> guess he forgot or never knew about Tesla. It was all near-field stuff as 
> in fact my
> use of a local radio station to power a bank of LEDs in my study is.


Exactly, makes me stick really, There was a post about a group of people who 
transmitted 60watts over 2 meters, big deal, I did 300watts 15 years ago, 
Tesla did did it way before anyone else. People should do a litlte homework 
before hand!

>>
>> If the transmitter is not coupled and has all these losses, then the
>> transmitter is not being loaded ? if so it would mean we could obtain
>> 100watts almost unlimited times ?!
>
> Does that seem reasonable? An unloaded (uncoupled-to-load) transmitter 
> should
> have few losses shouldn't it?
>


Not the transmitter, the losses are over the distance but its only voltage, 
its not really that important. It is the same as if you had a 1:1 isolation 
transformer, seperate the primary & secodary coils,  what happens ? the 
coupling drops, the power on the secondary drops, but thing is, if you can 
only obtain a few mA from the secondary then really it can't load the 
primary in any way, its just to far away!  Of course its as simple as I can 
tell it, may not necessarly be a working example.


>> All being said and done, that's all the facts and figures in a "overview"
>> kind of way.  Figures are the best I can come up with to fit the results.
>> They could be totally wrong though even so I can light up 300watts worth 
>> of
>> lamps form my tesla coil. The interesting test would have been to add 3 
>> more
>> coils, but something I just could not do unfortunately. So reason why I
>> posted my results to see if anyone else had done anything interesting 
>> along
>> these lines before ?
>
> I think you should arrange things so you can take the expt. further. It 
> hardly
> seems a satisfactory conclusion is reached when stopping at this point.


I stopped at this point 10 years ago, its why I am talking about it now as I 
just can't continue this work easily on my own. Annoying as it may be, what 
choice do I have ? I am trying to build a tesla coil working on low voltage 
and using high Q coils and obtaining the step-up via pc/sc ratios, though 
its slow going :-(

Its a side step direction really. trying to build a cheap solid state 
system. the DRSSTC will probably be my next attempt if I can't get my own to 
work. Even so, will not be until next year.

Really all I need is a better spark gap driven coil, they do make solid 
state spark gaps now, cost a fortune, good tank cap and good transformer and 
should obtain much better results. Though I will never be able to afford to 
build it. again its why I am trying to get people to understand my results 
as one day someone may be able to make use of my results. Nobout it will end 
up in the OU archives as unfinished or unproven OU devices, though unless I 
win the lotto then that's where it will have to stay.

I am going to build a very small proof of concept device soon, will document 
it and video it and host everything on my site for a while. Hopefully it 
will spark some interest, pardon the pun!

I am trying to obtain funds for the final build, though I doubt anyone will 
take the project serious, so not holding out on hopes. To be honest, All 
this work was done years ago, I just want the device to be proven OU or not 
OU, really don't care which after all this time. Though I hate unfinished 
things, but as I can't hardly put food in the table, building devices is 
just not going to happen anytime soon. Its the reason I am trying to tell 
everyone about my results. Some may agree, some may flame me, I really don't 
care. My findings are published on various groups and WebPages so maybe 
eventually in time the truth will be known.

Chris




>
> Malcolm
>
>
>