RE: Research Project (fwd)

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Original poster: List moderator <mod1@xxxxxxxxxx>



---------- Forwarded message ----------
Date: Tue, 22 May 2007 09:47:11 -0500 (CDT)
From: Gerardo Lezcano <lez_gera@xxxxxxxxx>
To: Tesla list <tesla@xxxxxxxxxx>, shmerpleton_town@xxxxxxxxxxx
Subject: RE: Research Project (fwd)

Matthew:
   
  Please send me your writings.  I am doing some armchair analysis, and maybe building some coils and solid state drivers, very low power.  Let me take a look at your work, to see if my ideas make some sense:
   
  Basically, I think all coilers have been tuning their coils to 1/4 lambda resonance, without taking into consideration the receiver coil.
   
  We all know that a coil for 1/4 lambda resonance at frequencies of 50 kHz and lower, tend to be huge and expensive.
   
  But, imagine two coils, size according to our hobby, separated "some" km.  One is Tx, other is Rx.  On the Tx side, you could feed it with a frequency corresponding to its 1/4 lambda resonance, being the LC system: topload, coil, Earth.  With this arrangement, "maybe" you could tap some energy on Rx side.
   
  Now, with the same system, feed the Tx with a frequency much lower, one wich will put in resonance the other LC system: Rx topload, Rx coil, Earth (transmission line, no more a capacitor plate), Tx coil, Tx topload.  This (I think) is a very different device:
   
  * If you disconnect Rx coil from Earth, then on Tx side, current consumption will drop.  Interesting, an "unpowered" Rx coil could "modulate" current draw on "powered" Tx coil.
  * For any given Rx coil, it could resonate to several frequencies, just put your Tx coil at a proper distance and feed a proper frequency.  Here you have a 1/2 lambda system, where each topload, Rx and Tx, are the voltage antinodes, conforming a long dipole.  The voltage node will be no longer exactly at the base of Tx coil.  It will be lets say, at half the distance between Tx and Rx coils.
  * So, we are feeding a dipole from near one end.  This is a high impedance feed, talking radio amateur way.  This is a difficulty.
  * The longer the distance, the less copper you will have to spend on your coils, and it will promote a lower resonance frequency.  And low frequency is the key to use the Earth as a conductor, because skin effect will give us several meters of conductive "skin".
  * But the shorter lenght of copper in your coils, the more high impedance feed point you will be at.  A bigger topload could help.

  best,
   
  GL.


Tesla list <tesla@xxxxxxxxxx> escribió:  Original poster: List moderator 



---------- Forwarded message ----------
Date: Mon, 21 May 2007 16:09:39 -0500
From: Matthew Boddicker 
To: tesla@xxxxxxxxxx
Subject: RE: Research Project (fwd)

this is Matthew Boddicker

I have completed an experiment four months ago in which I used the Earth as 
a transmission line from one "Transmitter coil" to an identicle "Reciever 
coil". The experiement was a success, in as much that it is possible, but 
all that the "Reciever coil" was able to do was to get a flourescent light 
bulb to flicker. I have a twenty page paper on the research project that I 
have been rewriting. if anyone is interested in getting it from me I can get 
a copy to e-mail in two or three weeks. my e-mail is

shmerpleton_town@xxxxxxxxxxx

My best wishes to your research.
Matthew


>From: "Tesla list" 
>To: tesla@xxxxxxxxxx
>Subject: Research Project (fwd)
>Date: Mon, 21 May 2007 10:58:42 -0600 (MDT)
>
>Original poster: List moderator 
>
>
>
>---------- Forwarded message ----------
>Date: Mon, 21 May 2007 11:01:31 -0500
>From: Drake Schutt 
>To: Tesla list 
>Subject: Research Project
>
>Well summer is almost here and next year I will be a senior in high school!
>As seniors we are required to do an independent research project over the
>summer, putting a minimum of 40 hours into it, and following up next school
>year with a 15 page paper. I see this as a perfect excuse to do some
>coiling as i haven't had much time this year. This is where I have trouble
>deciding where to go with this.
>
>My 12kv/90ma coil is nearing completion and I was thinking that I could do
>some sort of experiment with wireless power transmission. I know it's
>inefficient, but I recall someone talking about rigging up another coil to
>attach to a lightbulb which could be lit up from a fairly significant
>distance. I've researched this a bit but I can't really find anything 
>about
>a recieving coil and light bulbs, so if anyone has info it would be greatly
>appreciated.
>
>I also love music and after looking at some audio modulated tesla coils 
>with
>their "plasma speakers" I would love to build one. The only problem is 
>that
>I really have a limited knowledge of electronics outside of SGTC's and 
>SSTCs
>seem like a whole different animal. I'm not dumb, I just want to know if
>it's realistic to think that I can build a SSTC that can replicate this
>plasma speaker effect over the summer. I haven't seen anything about these
>audio coils on the list before, but I would bet that somebody out there
>knows about them.
>
>Also, if anyone has any more ideas that involve HV and TC's that would be
>feasible to do over the summer, please reply!
>
>Thanks as always,
>Drake Schutt
>
>

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