Originally posted by Gedfire
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My take would be that it is not the spark gap itself which 'rings', but the nature of the ionisation and components in series with that reacting to the conduction impulse, and if tuned resonant, then these inducing a repetitive gap 'firing', which itself might be coincidentally tuned.
Also a plate would act as a reflective/ directive ground plane if the point source had low ESR and was able to generate UHF/ microwave/ X-ray radiation.
Cheers .......... Graham.
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