Heterodyne

1901

Heterodyne

The book of science

Tom Sharp

Reginald Fessenden electromagnetism

Heterodyne

Heterodyning

No one knows

Heterodyne detection could reveal communication broadcasts from outer space from a ancient, superior, alien race of beings, if, that is, such a race, and such broadcasts were to be sent within the range of our receivers. The universe produces a lot of noise. Heterodyne processing of the noise itself can reveal both random and non-random processes.

See also in The book of science:

Readings on wikipedia: