Re: Tesla Coil RF interference

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

Original poster: "Paul Marshall" <klugmann-at-hotmail-dot-com> 

Actually Scott, I went back and measured it, it was 24'. The Neon tube (8" 
long) was made at a sign company down the street from where I live. The 
tube only glowed red and could be seen with the lights out. The streamer 
length was only about 4". The primary was wound around the same coil form 
and actually attached to the secondary. I am told that this is actually an 
ODIN coil. I used a single glass plate capacitor about 20"x12" x .18"  with 
aluminum foil for plates. The spark gap was static and consisted of just 
one large gap. If I attached a wire or a small coil of wire to the end of 
the tube like an antenna the tube would glow bright red and could be seen 
with the lights on.


My 6" dia. Pig powered coil would not do this, even though I was getting 8' 
streamers from it. I really believe that it has a lot to do with frequency. 
If you have any additional questions please feel free to contact me.



Paul S. Marshall





>From: "Tesla list" <tesla-at-pupman-dot-com>
>To: tesla-at-pupman-dot-com
>Subject: Re: Tesla Coil RF interference
>Date: Thu, 20 May 2004 16:52:10 -0600
>
>Original poster: "Scott Hanson" <huil888-at-surfside-dot-net>
>
>Paul -
>
>Can you supply some additional, specific details on your tiny 1-1/2" coil
>that was able to light neon tubes from 30 FEET away? By "30 feet away" you
>mean 30 MEASURED linear feet between coil and neon tube, correct? This is
>not a typo? What was the free-air streamer length the coil itself could
>produce at maximum output? What was the value of the tank capacitor, and the
>charging voltage?
>
>Can you describe the "neon tube" that was used? Length, diameter, shape,
>etc?
>
>When you say "light" the tube, do you mean a barely detectable flicker that
>could be seen only in a dark room, or that the tube was clearly glowing from
>end-to-end, or something else? Was the tube held in the hand, with both
>electrodes in free air, was one end grounded, etc? Are you certain the fill
>gas was neon?
>
>Given the inverse-square law for RF power, illuminating a neon tube at 30
>feet seems, well, incredible. I've seen much larger coils (5-6 foot streamer
>length) illuminate conventional 48" fluorescent tubes and neon sign tubing
>at 10-15 feet, but nothing past 20 feet.
>
>More specific information would help everyone understand the mechanism
>behind this extraordinary observation.
>
>Regards,
>Scott Hanson
>----- Original Message -----
>From: "Tesla list" <tesla-at-pupman-dot-com>
>To: <tesla-at-pupman-dot-com>
>Sent: Wednesday, May 19, 2004 7:18 AM
>Subject: RE: Tesla Coil RF interference
>
>
> > Original poster: "Paul Marshall" <klugmann-at-hotmail-dot-com>
> >
> > I noticed this with small out of tune coils. Actually, the first coil I
> > ever built was on a 1 1/2 inch form. At low power 450 watts, It would
>light
> > a neon tube at a distance of 30 feet. Metal objects that were not grounded
> > had induced voltages as high as 3kV. My neighbors complained about their
>TV
> > just looking like a blizzard. On the other hand my 6.5" coil running at 10
> > kW wouldn't do that and I was getting 8' streamers. I think it has a lot
>to
> > do with frequency. You seem to have just hit the right one.
> >
> >
> >
> > Paul S. Marshall
> >
> >
> >
> >
> >
> > >From: "Tesla list" <tesla-at-pupman-dot-com>
> > >To: tesla-at-pupman-dot-com
> > >Subject: Tesla Coil RF interference
> > >Date: Mon, 17 May 2004 23:03:04 -0600
> > >
> > >Original poster: "Gary Weaver" <gary350-at-earthlink-dot-net>
> > >
> > >I have noticed when I fire up my 10" coil it sets off motion detector
> > >light, security alarm systems, causes TV interference for 5 blocks it all
> > >directions of my house.   The neighbors security lights flash on and off.
> > >I can hear several alarm systems going off all over the neighbor hood.
>I
> > >took my portable 4" TC to work and fired it up and the telephone system
>was
> > >static so loud it was like putting my ear up to the spark gap.  Even the
>PA
> > >system sounds like the spark gap amplified to 50 watts.  I don't own a
>cell
> > >phone so I was wondering what effect a TC has on a cell phone?   Does it
> > >have any effect on a cell phone at 20 ft, 50 ft, 100 ft???
> > >
> > >Gary Weaver
> > >
> >
>