Fine Structure in Radio Sources at Metre Wavelengths--I: The Observations

A survey of radio sources in the declination range $$-\,10^{\circ} \text{to}\,+\,90^{\circ}$$ is in progress at a frequency of 81·5 MHz. The object of the survey is the study of angular structure on a scale $$\lt\,{1}^{\prime{}\prime}$$ using the method of interplanetary scintillation. A description of the radio telescope which was constructed for this purpose is given and the observational technique is outlined. The system is also of interest in connection with the discovery of pulsars.