In SX Microcontrollers, SX/B Compiler and SX-Key Tool, gibbman wrote:

In the early days of radio, the tranmission was by a "spark-gap" transmitter...on/off for Morse code, created by arcing the contacts with suitable voltage. You could probably be received by your dentures, the signal was so wide spectrum. I had a near impossible time once, trying to use a receiver near a plasma-torch metal plate machine. We moved the receiver.
Jim

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