As part of a general program for determining the radio structure of discrete sources, 532 sources have been observed using the two 90-ft paraboloids at the Owens Valley Radio Observatory as an east-west interferometer. The frequency of the observations was 1425 MHz and up to nine east-west spacings, ranging from 144 wavelengths to 2626 wavelengths, were used.
Because of the large amount of data, the discussion of the observations and results will be given in several papers. This paper, the first in the series, will list the visibility functions of the data. The interpretation of a visibility function in terms of a source structure and the statistical interpretation of the structures will be given in following papers
