Abstract
A sensitive observing system for observing the cosmic microwave background on an angular scale of 8° is described. This angular scale is appropriate for studies of intrinsicc fluctuations in the CMB generated by gravitational potential fluctuations (the Sachs-Wolfe effect). The beam-switching system employs low-noise and broad-band cryogenically cooled receivers. A major improvement in the stability of the system has resulted from triple-beam operation which removes the effects of atmospheric water vapour and ambient temperature changes to a level of several millikelvin on a single scan
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