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11:24 AM
Apparently, old-fashioned spark-gap radio transmitters are now illegal because they cause interference across a wide band of wavelengths. But, it seems like, an arc welder is also a spark gap. Anyone here happen to know, do they not cause an interference problem, and, if not, why not? Less power? It seems like, they look like a lot of power :-D
(I'm not sure whether this is too newbie a question for the main site).
 
 
3 hours later…
2:37 PM
Part of it is intent - you hook up an antenna to a transmitter, and are trying to optimize RF signal output. (and spark-gap transmitters have been illegal for almost 100 years)
 
 
1 hour later…
4:05 PM
Welders also include a significant inductance in the current-carrying part of the DC arc. Without it, the first perturbation would quench the arc. I'd imagine that the inductance would help to squelch higher-frequency noise also. They probably radiate most at x2 mains frequency, but this depends on the welder's topology (how is it rectifying.)
 

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