Re: Tesla Coil RF interference

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

Original poster: "Jim Lux" <jimlux-at-earthlink-dot-net> 


----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Wednesday, May 19, 2004 7:20 AM
Subject: Re: Tesla Coil RF interference


 > Original poster: "James" <mustang3-at-cox-dot-net>
 >
 > Hi List,
 >      The Tesla coil is a fair broadband jammer. However, your 100KHZ Tesla
 > coil does'nt have much energy at cell phone freqs(about 950MHz). The other
 > factor to consider is the old "square law". The energy drops at "square"
of
 > the distance. i.e. twice the distance=1/4 the energy.
 >
 > Later,
 >
 > James
 > P.S. Ex-ECM troop
 > P.P.S. I would guess that Gary's coil is propagating a lot of energy
through
 > the power lines. All these motion detectors and alarm systems are
poorly(if
 > at all) filtered/shielded.

How is your coil powered (i.e. where and how do you plug it in?)
What sort of ground connection are you using on the secondary?
Do you have a counterpoise/ground plane under the coil connected to the
"cold end" of the secondary? (this can help a lot, because the RF current
isn't flowing through some long ground wire (aka antenna).


 > ----- Original Message -----
 > From: "Tesla list" <tesla-at-pupman-dot-com>
 > To: <tesla-at-pupman-dot-com>
 > Sent: Tuesday, May 18, 2004 12:03 AM
 > Subject: Tesla Coil RF interference
 >
 >
 >  > 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
 >  >
 >  >
 >  >
 >
 >