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Bert --Previous Message--
: Interesting. If they are 'receptive' to the idea, I will have to experiment
: in that area!
:
: --Previous Message--
: --Previous Message--
: I have made the transition from Tesla coiler to Ham radio operator and
: find
: myself suffering from a guilty conscience. I'd hate to retire my coils to
: the dust of the tool shed indefinately, but I worry that I will be unable
: to show my face at the local club meetings if I continue to fire them up.
: What sort of QRM do they cause? Is it at least confined to harmonics of
: the resonant frequncy, or does it pretty much just bulldoze the spectrum?
:
:
: Hi Dave,
:
: Fortunately, Tesla coils are relatively poor radiators at their relatively
: low operating frequencies because their "antenna" is so small
: relative to their wavelength. However, the peak power in disruptive coils
: may be hundreds of kilowatts or even megawatts, so it doesn't take a very
: efficient radiator.
:
: Tesla Coils do radiate significantly at higher frequencies due to the
: spark gap in the primary circuit and the streamers coming off the topload.
: The negative resistance characteristic of a spark gap shock easily excites
: parasitic inductances and capacitances, creating VHF and UHF
: "hash" that can be quite significant near an operating coil.
: While radiation from the primary spark gap can be reduced somewhat by
: using relatively large ferrites on the leads going to the spark gap,
: you're pretty much stuck with the stuff coming off the secondary. And,
: because of the higher current, power arcs to ground radiate significantly
: more than air discharges.
:
: Once you're sure they won't kill you, you may want to try doing some Tesla
: Coil experiments with your (former?) friends in the club to see if you can
: get any actual radiation measurement data... :^)
:
: Best regards,
:
: Bert
:
:
:
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