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The purpose of a receiver is to collect efficiently the
astronomical signal that has been concentrated by the antenna near its
focal point, and to amplify it with a minimum of extra noise to a level
suitable for further processing by the spectrometers or continuum
detectors. Figure 3.1 shows the main subsystems of a
receiver, that we will discuss below.
Figure 3.1:
Synoptic diagram of a
typical receiver. This diagram is grossly simplified; for instance, the optics
involves mirrors, elliptical and planar, and also grids; the LO/PLL system is
actually more complicated than shown.
![\resizebox{12.0cm}{!}{\includegraphics{blf1.eps}}](img296.gif) |
S.Guilloteau
2000-01-19