[TCML] Re: Sculpture with Tesla coils
dexterlabs at dcemail.com
Tue Dec 8 13:45:32 MST 2009
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?
--- jimlux at earthlink.net wrote:
From: jimlux <jimlux at earthlink.net>
To: Tesla Coil Mailing List <tesla at pupman.com>
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.
> But I don't know the data.
> Mary should better contact W.Wysock for that matter.
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.
"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
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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