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What is spark gap in electronics?
A spark gap consists of an arrangement of two conducting electrodes separated by a gap usually filled with a gas such as air, designed to allow an electric spark to pass between the conductors.
Are spark gaps illegal?
Spark-gap transmitters are illegal to use nowadays, for the very reason they’re messy and cause lots of interference. As a side note, spark-gaps are still used in TIG welders.
Why did the spark gap transmitter not work?
Further developments enabled the spark gap transmitter to operate even more successfully. One of the major issues with spark transmitters was that the antenna circuit could feed back energy that would cause the spark to reoccur after the first burst of oscillations. This spark caused a signal to appear on a different frequency.
How are radio waves transmitted through a spark gap?
A spark-gap transmitter is a device that generates radio frequency electromagnetic waves using an intermittent electric discharge across a spark gap to produce radio frequency current oscillations in a tuned circuit. These are fed to an aerial to transmit a radio signal through the atmosphere.
When did James Clerk Maxwell create the spark gap transmitter?
The history of radio shows that the spark gap transmitter was the product of many people, often working in competition. In 1862 James Clerk Maxwell predicted the propagation of electromagnetic waves through a vacuum. In 1878, David E. Hughes used a spark gap to generate radio signals, achieving a detectable range of approximately 500 metres.
When did they start using spark gap oscillators?
As late as 1955, a Japanese radio-controlled toy bus used a spark transmitter and coherer receiver; the spark was visible behind a sheet of blue transparent plastic. Spark gap oscillators are still used to generate high frequency high voltage to initiate welding arcs in gas tungsten arc welding [1].