Re: Noisy Gaps x2

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "by way of Terry Fritz <twftesla-at-qwest-dot-net>" <dhmccauley-at-spacecatlighting-dot-com>


I can assure you that most of the noise (at least audible) DOES NOT come
from the gap.

Dan



> If most of the "noise" is coming from the gap, has anyone done any
> significant looks into a Faraday cage, or metal enclosure, over the gap?
>
> And with that, what has anyone found to be the least obnoxious (read
> quietest) type of gap? Enclosed or Open? Static or RSG? What???
>
> I live in an up-scale part of town and radio noise aside, most everyone
> has cable or dishes, the audible noise is sure to annoy a couple of
> neighbors.
>
> Anyone had to deal with unreasonable neighbors and what steps solved the
> problems. It's not a problem yet, as I'm still under construction, but
> I'm sure it will be.
>
> Thanks,
>
> Ken
>
>
> -----Original Message-----
> From: Tesla list [mailto:tesla-at-pupman-dot-com]
> Sent: Thursday, October 03, 2002 11:46 AM
> To: tesla-at-pupman-dot-com
> Subject: Re: Halloween Coiling and the FCC
>
> Original poster: "Winston Krutsch by way of Terry Fritz
> <twftesla-at-qwest-dot-net>" <u236-at-earthlink-dot-net>
>
> Hi Dan, All,
>
> This sounds bad, since I have an airport about 4 miles from my
> house...  But, is the LF radiation from the coil of much concern to the
> airport?  I think some navigation beacons run at low frequency, but
> maybe I'm wrong?
>
> I think the parasitic oscillations in the tank circuit that run
> into
> the multi-MHz and 100 MHz range are of more concern, since they are in
> communications bands (I think).  Has anyone detected these VHF range
> signals at any significant distance from a running coil?  I know much of
> the VHF hash comes from the sparkgap itself.  The same interference is
> caused by electric drills, saws, and other devices with brush-type
> motors, and people don't usually don't care about it.  Also, I don't
> think that airports have much of a problem with it.
>
> I'm just wondering if my situation really warrants caution from
> a
> radiated RF standpoint.  I run my coil outside often, and even with a
> crummy RF ground, and no line filters, my mother reports only minor TV
> interference (when the coil is in tune).  When out of tune, the TV
> wasn't watchable :-0.
>
> Thanks,
> Winston K.
>
> Tesla list wrote:
> >
> > Original poster: "by way of Terry Fritz <twftesla-at-qwest-dot-net>"
> <dhmccauley-at-spacecatlighting-dot-com>
> >
> > I know a lot of people here claim that tesla coils are quite "lousy"
> at
> > being antennas and all that, but they throw a whole huge amount of RF
> hash
> > out in the atmosphere especially when run outside.  Especially in a
> very
> > urbanized area, you may attract the attention of other "listens"
> especially
> > if near an airport, etc...
> >
> > My very good friend Lou, a seasoned ham operator, made a bet with me.
> He
> > claimed he could hear my tesla coil with his antennas at 20 miles away
> > during operation.  Since "the group" here previously claimed that
> tesla
> > coils were lousy radiators, i figured i had that bet won.  Anyways, i
> set my
> > coil up outside and he and my friend were at his house where all his
> ham
> > equipment was set-up.  We then synchronized our watches and he
> informed me
> > to key at random 3 short pulses.  This was accomplished by quickly
> turning
> > off power to my 15kv/60mA NST.  He then told me to do this at random
> > intervals for the next half hour and that he would record the exact
> time he
> > received them.
> >
> > Well, sure enough he got almost all the transmissions.  He also picked
> up to
> > the 3rd harmonics of the signal as well which were much fainter no
> less, but
> > still detectable.
> >
> > We then reversed roles and repeated the experiment.  Voila.  Same
> results.
> > And it was blatantly obvious when that thing was on.
> >
> > I never would have thought it could be such an efficient radiator!!!!
> I'm
> > convinced now!!!!
> >
> > HOWEVER, it still wouldn't stop me from firing my coil up outside.
> I'm
> > going to do the same.  Of course, halloween is the perfect excuse to
> run the
> > coil outside!!!!
> >
> > Dan
> >
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