Re: frequency of electromagnetic radiation

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: <davep@xxxxxxxx>


> Hello, I am curious as to what frequency the output arcs (and
> electromagnetic radiation) is?

   Unanswerable question.
    8)>>

   The frequencies will be many, varied, vary from stroke to stroke,
   depend on coil parameters,

   Some of it is blue white/yellow white light, which is,
   after all, electromganetic radiation.

   Some IR (longer) and UV (shorter) than visible is also
   emag.

   The 'resonance' freq of the coil/cap will dominate.
   This is et by the design.

   There will be multiples (harmonics) at f, 3f, etc.

   The high frequencies will drop off, as the park/arc
   lasts long enough quench them.  Maybe some 'vhfish'
   peaks at the lengths of the sparks/arcs.

   The system as a whole will put out strays at a range
   of freqs, set by ire lengths, etc.

   A spectrum analyser if handy, expensive.  A calibrated,
   or otherwise, receiver will give some indications.
   Serious work needs to be aware that ALL receivers have more
   or less false reponses, eg a signal at f1, may really be
   a stray on another freq.  (whole 'nother discussion...  8)>>)

   (hint:
    I used to do EMI/RFI for a living...)

    best
     dwp