RE: FCC

["sundog" <sundog-at-timeship-dot-net> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)]

Hi All!

 Errr.... FCC...The guys in the white van that seems to circle the block
while I'm doing anything with neon xformers, caps, and 1/4 mile of wire in a
spiral....

  Nah, on a serious note, while TC's are disruptive to TV and radio when
not-in-tune, I haven't noted any serious problems with running my mistuned
coils.  When they're running good I hear a crackling sound in the radio, and
a tiny bit of fuzz.  When mis-tuned, I get more crackling, more fuzz, and my
computer will reboot itself at random.  Leaving it plugged in is a Bad
Thing(tm), but I despise unplugging it to tinker (it's where I keep notes),
and can fix it if I toast it anyway.

My $.01, use line filters on your mains.  Use a good RF ground.  Invite the
neighbors to watch your nighttime demonstration of 100 year old technology.
If they're watching the coil instead of a TV, they won't notice the
interference :)

	Caio!
								sundog

-----Original Message-----
From: Tesla list [mailto:tesla-at-pupman-dot-com]
Sent: Sunday, July 16, 2000 3:04 PM
To: tesla-at-pupman-dot-com
Subject: Re: FCC


Original poster: "Andreas Marshall" <marand-at-t-online.de>

I built a little twin System (1").
When runin a distance of about 50cm (~20") from a Radio (FM),
practically no disturbances can be heard. TVs in my House are also
not affected.
This is different, when the TC is not correctly tuned. Then some (not many)
interferences occur.
Why - i dont know

Good luck with the FCC

Andreas

Tesla list wrote:

> Original poster: "Jim Lux" <jimlux-at-jpl.nasa.gov>
>
> There is some dispute about the FCC regulatory aspects of tesla coils.
>
> Your TC is what is known as an "unintentional radiator" (that is, you
> aren't trying to put out RF, it just happens as a byproduct of what you
are
> doing).  This is good, because damped sinusoid transmissions (what a TC
> puts out) are specifically forbidden for intentional radiators (The part
of
> the regs that killed "King Spark").
>
> Then, you fall into a whole set of requirements about how much RF power
you
> can legally radiate, and how you go about verifying it.  This is all
> described in some detail in Part 15 of the FCC regs (47 CFR).  You can get
> wrapped around the axle about what class your TC falls into, whether you
> are a manufacturer or not, whethere it is Industrial Scientific Medical
> equipment, whether it is experimental lab equipment, etc.... all these
> questions are best avoided... (Leaving aside folks who build and display
> coils for a living, who have to deal with this issue with shielding cages
> and the like).
>
> Ultimately, the practical impact is this: If you don't interfere, then
> nobody will complain, and the FCC won't ever hear about you.
>
> Fortunately, most TC's are very poor antennas, and don't actually radiate
> much RF power.  Conduction back through the power lines (either directly,
> or by capacitive coupling) will be the most likely way to radiate or
> interfere, so use an RFI filter.
>
> ----------
> > From: Tesla list <tesla-at-pupman-dot-com>
> > To: tesla-at-pupman-dot-com
> > Subject: FCC
> > Date: Friday, July 14, 2000 10:01 PM
> >
> > Original poster: "Nick Graber" <nickgraber-at-home-dot-com>
> >
> > I have a question about the fcc.  It has been pointed out that
teslacoils
> cause
> > interfirence with other electronical devices and RF is it nessacary to
> got a
> > licence to run a teslacoil or such a thing.  I was just wondering.
> >
> > Nick Graber
> > nickgraber-at-home-dot-com
> >
> >
> >