The regenerative radio receiver is a shortwave radio design used in the early 20th century. The basic principle is that the incoming radio signal, when demodulated, is used to provide energy to the incoming signal, creating, in effect, a positive feedback loop. Careful control on the part of the operator is necessary, as the radio must be kept on the verge of oscillating for best results.

The regenerative detector obtains one of the highest single-stage gains of any detector, at the expense of the necessary operator control. Automatic regeneration control would make the radio complex enough so that a superheterodyne receiver would be simpler to design and build.

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