autodyne
/ˈɔːtə(ʊ)dʌɪn/Radio
adjective
Designating or relating to a circuit in which the part used for detection is also used as the local oscillator.
noun
An autodyne circuit. Now rare.
Origin
Early 20th century; earliest use found in Circular United States Bureau of Standards. From auto- + -dyne, after heterodyne.