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Quartz crystals
crystalsPieter-Tjerk de Boer, PA3FWM web@pa3fwm.nl (This is an adapted version of part of an article I wrote for the Dutch amateur radio magazine Electron, August 2016.) Quartz crystals have been used in radio technology since the 1920s, to build very stable oscillators and to filter signals. In WW2 they started to be mass-produced, as is very nicely documented in [1], back then based on natural quartz from Brazil.
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