Re: Tesla Coil RF interference 2

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

Original poster: "Gary Weaver" <gary350-at-earthlink-dot-net> 

Transmitters use to be Spark Gap type transmitters way back when.  The
Titanic had a spark gap transmitter as I recall.  I wonder if an LC circuit
could be attached to a TC spark gap and transmit on a certain frequency.  I
just did some calculations and I get 900 MHZ with 1pf cap and 3 turns of
.018 dia. wire .125" OD .250" long.  Wonder if a cell phone would pick that
up.  I might build an LC circuit on my TC for a certain radio frequency and
see if it will transmit to a radio.   I did a little research on spark gap
transmitters it seems to be only a spark gap connected to an LC circuit
with an antenna.   Simple technology.


Gary Weaver
gary350-at-earthlink-dot-net
Why Wait?  Move to EarthLink.


 > [Original Message]
 > From: Tesla list <tesla-at-pupman-dot-com>
 > To: <tesla-at-pupman-dot-com>
 > Date: 5/19/2004 9:20:38 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.
 > ----- 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
 >  >
 >  >
 >  >
 >