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This is a term for a crystal radio, which is a radio receiver which is powered only by the incoming signal. It uses a crystal detector and is considered the most simple radio receiver design. The term crystodyne has sometimes been used mistakenly as an alternative to the superheterodyne receiver. In reality, a crystodyne radio can use the superheterodyne receiver design.This is a term for a crystal radio, which is a radio receiver powered only by the incoming signal. It uses a crystal detector and is considered the most simple radio receiver design. The term crystodyne has sometimes been used mistakenly as an alternative to the superheterodyne receiver. In reality, a crystodyne radio can use the superheterodyne receiver design.