Re: Tesla Coil RF Transmitter

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "Dan" <DUllfig@xxxxxxxxxxxxx>

Hi all, this response isn't directed at any one in particular; I just 
have a few observations:

1 -- the earth is conductive, or we would not be grounding equipment in it;
2 -- RF can be conducted thru a conductor, or coax would not exist.

and finally,

3 -- given the above statements, why is it so hard for anyone to 
believe that Tesla was transmitting by conduction through the earth, 
and not propagation through the air?! Just becuase you CAN transmit 
RF through the air, doesn't mean it is the ONLY way to do it.

When tesla was working in Colorado Springs, he worked out two ways of 
detecting high frequency currents. He had a very sensitive receiver, 
which seems to have been a precursor to the regenerative radio 
receiver. Then he was also able to receive substantial currents 
(enough to light light bulbs) using a second Tesla coil tuned to the 
transmitted frequency. Why would he need two different methods of 
receiving (one really sensetive, and one brute force) if he was not 
transmitting in two different ways?

And Sam, you said the TC transmits poorly; considering that Tesla was 
lighting up light bulbs with his receivers, seems his coils were 
transmitting just fine...

Some of his earlier experiments involved running a loop of cable 
around his laboratory. He would run RF through it, and light up 
special bulbs anywhere in his lab. He was constantly running 
experiments, probably hundreds of them by the time he was through. If 
his transmitters acutally needed an Aerial, don't you think he would 
have figured that out? why would he drop the earlier aerial (say that 
really quick three times :) in favor of a capacitive top load, if it 
performed worse? It's not like he never tried an antenna!

Dan

----- Original Message -----
From: <mailto:tesla@xxxxxxxxxx>Tesla list
To: <mailto:tesla@xxxxxxxxxx>tesla@xxxxxxxxxx
Sent: Saturday, September 10, 2005 10:58 AM
Subject: RE: Tesla Coil RF Transmitter

Original poster: d a <<mailto:btoc3000@xxxxxxxxxxxx>btoc3000@xxxxxxxxxxxx>

So the whole secondary (topload + secondary coil + RF ground) is the
short aerial?

Also, what exactly is a RF ground? I notice that if I do not provide
an RF ground, my sparks are few cm only. When I provide a good RF
ground, the output of the sparks will be much better.

Regards
Sam

Tesla list <<mailto:tesla@xxxxxxxxxx>tesla@xxxxxxxxxx> wrote:
Original poster: "Derek Woodroffe"

Sam,

A TC is an RF transmitter as you have a large amount of RF power pushed into
a short ariel (secondary) so it will radiate as a transmitter will, although
poorly. (two lines, but not very descriptive)...

You cannot go into much detail about a Tc in under ten lines..
especially to go through the whole load of electrical & RF theory
never mind the rest of the physics and math.

I had a go at describing a TC in as simpler way as possible my
attempt is at 
<http://www.roffesoft.co.uk/tesla/tccct/tccct.htm>http://www.roffesoft.co.uk/tesla/tccct/tccct.htm 
It does of
course only briefly describe a static gap tesla coil, but in 10 pictures or
so, that's not too bad.

Hope it helps..

Sorry, but there is no real alternative to reading up on your
subject, or subjects in the case of TC's

Best way is do it, ask 'n' learn....

Derek



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