In this paper, we present a 1-bit method of computing autocorrelation functions. The experimental set-up of a 40-channel 1-bit autocorrelator developed at the Physical Research Laboratory, Ahmedabad is presented. Using noise input, the correlator was tested in conjunction with the 70-MHz IF amplifier, which forms a part of an RF spectral line receiver developed for the purpose of detecting OH emissions at 18-cm wavelength from interstellar hydroxyl molecules. Two sets, one of 7 and the other of 50 minutes of integration time, of test observations were analysed to compute autocorrelation functions and power spectra. It is concluded that the highest accuracy of spectral measurements would be achieved provided the latter are made in the flat region of the response of the band-pass filter.
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