Superheterodyne reception
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4-1-700
A method of reception in which the signal carrier-frequency is changed to another, generally lower, radio frequency by a heterodyne process. There may be more than one such change of radio frequency.
Note: This method was originally called "supersonic heterodyne reception".
Reference: B.S.
Please note that this is the term as it stands in the original IALA Dictionary edition (1970-1989)