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postscript
PPEUC CMB index
1 Introduction...
Mullard Radio Astronomy
Observatory, Cavendish Laboratory,
Madingley Road, Cambridge CB3 0HE, U.K.
to 
, and provide constraints on the CMB power
spectrum with similar sensitivity to bolometric measurements. Total-power
measurements have been made possible by careful experimental design, including
sophisticated scanning strategies and optical arrangements and use of
exceptionally dry sites. Interferometric measurements offer suppression of
several systematic effects and have been made on smaller angular scales and
from less extreme sites; several new experiments are being constructed covering
the expected angular scales of the Doppler peaks. Measurements on smaller
scales at centimetre wavelengths are prone to contamination from extragalactic
sources, and higher-resolution data are necessary to cope with this.