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This lecture presents the principle of the heterodyne interferometer. An
heterodyne interferometer is composed of antennas (described in
A.Greve lecture 1), receivers
(described in B.Lazareff lecture 3),
a correlator (described in H.Wiesemeyer lecture 4)
and an awful lot
of cables and connections. This lecture only describes the basic principles;
a more complete description, including subtleties due to multiple frequency
conversions and digital delay lines, is given in R.Lucas lecture 5.