Editing Regenerative circuit (section)

===CW reception (autodyne mode)===
{{main|Autodyne}}
For the reception of [[Continuous wave|CW]] [[radiotelegraphy]] ([[Morse code]]), the feedback is increased just to the point of oscillation. The tuned circuit is adjusted to provide typically 400 to 1000 Hertz difference between the receiver oscillation frequency and the desired transmitting station's signal frequency. The two frequencies [[beat frequency|''beat'']] in the nonlinear amplifier, generating [[heterodyne]] or ''beat'' frequencies.<ref>[https://archive.org/stream/principlesunderl00unitrich#page/502/mode/2up Signal Corps U.S. Army, ''The Principles Underlying Radio Communication'', 2nd ed. Washington, DC: U.S.G.P.O., 1922, p. 501]</ref> The difference frequency, typically 400 to 1000 Hertz, is in the audio range; so it is heard as a tone in the receiver's speaker whenever the station's signal is present.

Demodulation of a signal in this manner, by use of a single amplifying device as oscillator and [[Frequency mixer|mixer]] simultaneously, is known as ''autodyne'' reception.<ref>[https://archive.org/stream/principlesunderl00unitrich#page/502/mode/2up Signal Corps U.S. Army, 1922, p. 503]</ref> The term ''autodyne'' predates multigrid tubes and is not applied to use of tubes specifically designed for frequency conversion.