MEASUREMENTS OF THE MICROWAVE ANISOTROPY AT 8-MM WAVELENGTH WITH A 3.5-DEGREES ANTENNA (CORRECTED VERSION OF NU154)

Results of the measurements of the cosmic background radiation (CBR) a nisotropy, performed at the Pamir plateau (4300 m above sea level), an d data-reduction procedures applied are presented. The observations we re conducted with a highly sensitive receiver (13 mK s1/2), operating at 8 mm. The radio brightness-temperature difference between two 3.5-d egrees antennae (FWHM) was measured, their axes offset by 5-degrees. A n rms deviation of 1.21 mK per pixel was obtained for the averaged sca n (81-degrees in length). No CBR fluctuations were found. At a 95% con fidence level, the upper limit for fluctuations was estimated to be 0. 42 mK, corresponding to the following quadrupole constraints: (DELTAT/ T)2 < 1.4 x 10(-4) for the Harrison-Zel'dovich spectrum of the initial fluctuations; or (DELTAT/T)2 < 1.5 x 10(-5) for the white-noise fluct uations.