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== History ==Major Edwin Howard Armstrong is credited with developing the first practical superheterodyne receiver design. While conducting military work in France during WWI Armstrong developed an approach that first converted the signal to a fixed intermediate frequency, which was then processed and amplified. His work began in 1918 and by 1920 the superheterodyne design started to replace Tuned Radio Frequency receivers. His approach first converted the signal to a fixed intermediate frequency, which was then processed and amplified which allowed reception of a much broader frequency range, in particular providing superior reception of signals higher than 1500 kHz.The development of high quality vacuum-tubes during WW1 made possible great improvements to the superheterodyne receiver.