Re: [TCML] Re: Sculpture with Tesla coils

["Dex Dexter" <dexterlabs@xxxxxxxxxxx>]

Hey,my point is if it can be done good enough for 
SGTC capable of developing 15 feet long
discharges, it can be done for less powerfull coils
creating up to 5 feet sparks too.
Notice that in the article author uses words
"OSHA and FCC guidelines" ,AFAIK they are very restriktive,
and this probably means success in significant EMI reduction.
I don't know about EMI difference between VTTC and SGTC (compared
the same power level) there,but there must be  some due to
different ways of operation.Don't you agree?

Dex
      

--- jimlux@xxxxxxxxxxxxx wrote:

From: jimlux <jimlux@xxxxxxxxxxxxx>
To: Tesla Coil Mailing List <tesla@xxxxxxxxxx>
Subject: Re: [TCML] Re: Sculpture with Tesla coils
Date: Tue, 08 Dec 2009 10:17:30 -0800

Dex Dexter wrote:
> People installed the mesh cages it and measured the
> EMI effectiveness  protection it offers.
>  
> http://www.ttr.com/its_model9.html
> 
> But I don't know the data.
> Mary should better contact W.Wysock for that matter.
> 
> Dex
>
Bill just says "provides control", but doesn't provide any quantitative 
data.  As DaveP pointed out, you CAN do EMI/EMC control with a suitable 
cage, but it's non-trivial to do a good job.

You need to have some quantitative objective:  To a first order, the 
field inside (close to the coil) is on the order of several 100kV/meter. 
  Do you want 60dB attenuation? (to 100V/meter) or 80dB (to 10V/m) or 
100dB (to 1V/m).  The latter is pretty challenging.

http://ewh.ieee.org/soc/embs/comar/interfer.htm
"The prevailing international standard for the RF immunity of medical 
devices is the 1993 revision of the International Electrotechnical 
Commission (IEC) Standard IEC 601-1-2. This standard sets a minimum 
immunity level of 3 volts per meter (V/m) in the 26-1000 MHz frequency 
range."


Or, are you just looking to not interfere with some sort of radio?
Or to not destroy a victim radio?


Experiment: Put your cell phone in a microwave oven: a shielded 
enclosure designed to attenuate 2.4 GHz from the several hundred watt 
level inside to less than 2 mW/cm^2 outside. It's got gaskets, mesh, 
solid metal walls, etc.  Call the cell phone and see if it rings.





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